Titanium

Titanium is a chemical element with symbol Ti and atomic number 22. It is a lustrous transition metal with a silver color, low density, and high strength. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine.

Titanium was discovered in Cornwall, Great Britain, by William Gregor in 1791, and was named by Martin Heinrich Klaproth after the Titans of Greek mythology. The element occurs within a number of mineral deposits, principally rutile and ilmenite, which are widely distributed in the Earth's crust and lithosphere, and it is found in almost all living things, water bodies, rocks, and soils.[6] The metal is extracted from its principal mineral ores by the Kroll[7] and Hunter processes. The most common compound, titanium dioxide, is a popular photocatalyst and is used in the manufacture of white pigments.[8] Other compounds include titanium tetrachloride (TiCl4), a component of smoke screens and catalysts; and titanium trichloride (TiCl3), which is used as a catalyst in the production of polypropylene.[6]

Titanium can be alloyed with iron, aluminium, vanadium, and molybdenum, among other elements, to produce strong, lightweight alloys for aerospace (jet engines, missiles, and spacecraft), military, industrial processes (chemicals and petrochemicals, desalination plants, pulp, and paper), automotive, agri-food, medical prostheses, orthopedic implants, dental and endodontic instruments and files, dental implants, sporting goods, jewelry, mobile phones, and other applications.[6]

The two most useful properties of the metal are corrosion resistance and strength-to-density ratio, the highest of any metallic element.[9] In its unalloyed condition, titanium is as strong as some steels, but less dense.[10] There are two allotropic forms[11] and five naturally occurring isotopes of this element, 46Ti through 50Ti, with 48Ti being the most abundant (73.8%).[12] Although they have the same number of valence electrons and are in the same group in the periodic table, titanium and zirconium differ in many chemical and physical properties.

Titanium,  22Ti
Titan-crystal bar
Titanium
Pronunciation/tɪˈteɪniəm, taɪ-/[1] (tə-TAY-nee-əm, ty-)
Appearancesilvery grey-white metallic
Standard atomic weight Ar, std(Ti)47.867(1)[2]
Titanium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson


Ti

Zr
scandiumtitaniumvanadium
Atomic number (Z)22
Groupgroup 4
Periodperiod 4
Blockd-block
Element category  transition metal
Electron configuration[Ar] 3d2 4s2
Electrons per shell
2, 8, 10, 2
Physical properties
Phase at STPsolid
Melting point1941 K ​(1668 °C, ​3034 °F)
Boiling point3560 K ​(3287 °C, ​5949 °F)
Density (near r.t.)4.506 g/cm3
when liquid (at m.p.)4.11 g/cm3
Heat of fusion14.15 kJ/mol
Heat of vaporization425 kJ/mol
Molar heat capacity25.060 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1982 2171 (2403) 2692 3064 3558
Atomic properties
Oxidation states−2, −1, +1, +2, +3, +4[3] (an amphoteric oxide)
ElectronegativityPauling scale: 1.54
Ionization energies
  • 1st: 658.8 kJ/mol
  • 2nd: 1309.8 kJ/mol
  • 3rd: 2652.5 kJ/mol
  • (more)
Atomic radiusempirical: 147 pm
Covalent radius160±8 pm
Color lines in a spectral range
Spectral lines of titanium
Other properties
Natural occurrenceprimordial
Crystal structurehexagonal close-packed (hcp)
Hexagonal close packed crystal structure for titanium
Speed of sound thin rod5090 m/s (at r.t.)
Thermal expansion8.6 µm/(m·K) (at 25 °C)
Thermal conductivity21.9 W/(m·K)
Electrical resistivity420 nΩ·m (at 20 °C)
Magnetic orderingparamagnetic
Magnetic susceptibility+153.0·10−6 cm3/mol (293 K)[4]
Young's modulus116 GPa
Shear modulus44 GPa
Bulk modulus110 GPa
Poisson ratio0.32
Mohs hardness6.0
Vickers hardness830–3420 MPa
Brinell hardness716–2770 MPa
CAS Number7440-32-6
History
DiscoveryWilliam Gregor (1791)
First isolationJöns Jakob Berzelius (1825)
Named byMartin Heinrich Klaproth (1795)
Main isotopes of titanium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
44Ti syn 63 y ε 44Sc
γ
46Ti 8.25% stable
47Ti 7.44% stable
48Ti 73.72% stable
49Ti 5.41% stable
50Ti 5.18% stable

Characteristics

Physical properties

As a metal, titanium is recognized for its high strength-to-weight ratio.[11] It is a strong metal with low density that is quite ductile (especially in an oxygen-free environment),[6] lustrous, and metallic-white in color.[13] The relatively high melting point (more than 1,650 °C or 3,000 °F) makes it useful as a refractory metal. It is paramagnetic and has fairly low electrical and thermal conductivity.[6]

Commercially pure (99.2% pure) grades of titanium have ultimate tensile strength of about 434 MPa (63,000 psi), equal to that of common, low-grade steel alloys, but are less dense. Titanium is 60% denser than aluminium, but more than twice as strong[10] as the most commonly used 6061-T6 aluminium alloy. Certain titanium alloys (e.g., Beta C) achieve tensile strengths of over 1,400 MPa (200,000 psi).[14] However, titanium loses strength when heated above 430 °C (806 °F).[15]

Titanium is not as hard as some grades of heat-treated steel; it is non-magnetic and a poor conductor of heat and electricity. Machining requires precautions, because the material can gall unless sharp tools and proper cooling methods are used. Like steel structures, those made from titanium have a fatigue limit that guarantees longevity in some applications.[13]

The metal is a dimorphic allotrope of an hexagonal α form that changes into a body-centered cubic (lattice) β form at 882 °C (1,620 °F).[15] The specific heat of the α form increases dramatically as it is heated to this transition temperature but then falls and remains fairly constant for the β form regardless of temperature.[15]

Chemical properties

Titanium in water Pourbaix diagram
The Pourbaix diagram for titanium in pure water, perchloric acid, or sodium hydroxide[16]

Like aluminium and magnesium, titanium metal and its alloys oxidize immediately upon exposure to air. Titanium readily reacts with oxygen at 1,200 °C (2,190 °F) in air, and at 610 °C (1,130 °F) in pure oxygen, forming titanium dioxide.[11] It is, however, slow to react with water and air at ambient temperatures because it forms a passive oxide coating that protects the bulk metal from further oxidation.[6] When it first forms, this protective layer is only 1–2 nm thick but continues to grow slowly; reaching a thickness of 25 nm in four years.[17]

Atmospheric passivation gives titanium excellent resistance to corrosion, almost equivalent to platinum. Titanium is capable of withstanding attack by dilute sulfuric and hydrochloric acids, chloride solutions, and most organic acids.[7] However, titanium is corroded by concentrated acids.[18] As indicated by its negative redox potential, titanium is thermodynamically a very reactive metal that burns in normal atmosphere at lower temperatures than the melting point. Melting is possible only in an inert atmosphere or in a vacuum. At 550 °C (1,022 °F), it combines with chlorine.[7] It also reacts with the other halogens and absorbs hydrogen.[8]

Titanium is one of the few elements that burns in pure nitrogen gas, reacting at 800 °C (1,470 °F) to form titanium nitride, which causes embrittlement.[19] Because of its high reactivity with oxygen, nitrogen, and some other gases, titanium filaments are applied in titanium sublimation pumps as scavengers for these gases. Such pumps inexpensively and reliably produce extremely low pressures in ultra-high vacuum systems.

Occurrence

2011 production of rutile and ilmenite[20]
Country thousand
tonnes
% of total
Australia 1,300 19.4
South Africa 1,160 17.3
Canada 700 10.4
India 574 8.6
Mozambique 516 7.7
China 500 7.5
Vietnam 490 7.3
Ukraine 357 5.3
World 6,700 100

Titanium is the ninth-most abundant element in Earth's crust (0.63% by mass)[21] and the seventh-most abundant metal. It is present as oxides in most igneous rocks, in sediments derived from them, in living things, and natural bodies of water.[6][7] Of the 801 types of igneous rocks analyzed by the United States Geological Survey, 784 contained titanium. Its proportion in soils is approximately 0.5 to 1.5%.[21]

Common titanium-containing minerals are anatase, brookite, ilmenite, perovskite, rutile, and titanite (sphene).[17] Akaogiite is an extremely rare mineral consisting of titanium dioxide. Of these minerals, only rutile and ilmenite have economic importance, yet even they are difficult to find in high concentrations. About 6.0 and 0.7 million tonnes of those minerals were mined in 2011, respectively.[20] Significant titanium-bearing ilmenite deposits exist in western Australia, Canada, China, India, Mozambique, New Zealand, Norway, Sierra Leone, South Africa, and Ukraine.[17] About 186,000 tonnes of titanium metal sponge were produced in 2011, mostly in China (60,000 t), Japan (56,000 t), Russia (40,000 t), United States (32,000 t) and Kazakhstan (20,700 t). Total reserves of titanium are estimated to exceed 600 million tonnes.[20]

The concentration of titanium is about 4 picomolar in the ocean. At 100 °C, the concentration of titanium in water is estimated to be less than 10−7 M at pH 7. The identity of titanium species in aqueous solution remains unknown because of its low solubility and the lack of sensitive spectroscopic methods, although only the 4+ oxidation state is stable in air. No evidence exists for a biological role, although rare organisms are known to accumulate high concentrations of titanium.[22]

Titanium is contained in meteorites, and it has been detected in the Sun and in M-type stars[7] (the coolest type) with a surface temperature of 3,200 °C (5,790 °F).[23] Rocks brought back from the Moon during the Apollo 17 mission are composed of 12.1% TiO2.[7] It is also found in coal ash, plants, and even the human body. Native titanium (pure metallic) is very rare.[24]

Isotopes

Naturally occurring titanium is composed of 5 stable isotopes: 46Ti, 47Ti, 48Ti, 49Ti, and 50Ti, with 48Ti being the most abundant (73.8% natural abundance). At least 21 radioisotopes have been characterized, the most stable of which are 44Ti with a half-life of 63 years; 45Ti, 184.8 minutes; 51Ti, 5.76 minutes; and 52Ti, 1.7 minutes. All other radioactive isotopes have half-lives less than 33 seconds, with the majority less than half a second.[12]

The isotopes of titanium range in atomic weight from 39.99 u (40Ti) to 57.966 u (58Ti). The primary decay mode before the most abundant stable isotope, 48Ti, is electron capture and the primary mode after is beta emission. The primary decay products before 48Ti are element 21 (scandium) isotopes and the primary products after are element 23 (vanadium) isotopes.[12]

Titanium becomes radioactive upon bombardment with deuterons, emitting mainly positrons and hard gamma rays.[7]

Compounds

Titanium nitride coating
TiN-coated drill bit

The +4 oxidation state dominates titanium chemistry,[25] but compounds in the +3 oxidation state are also common.[26] Commonly, titanium adopts an octahedral coordination geometry in its complexes, but tetrahedral TiCl4 is a notable exception. Because of its high oxidation state, titanium(IV) compounds exhibit a high degree of covalent bonding. Unlike most other transition metals, simple aquo Ti(IV) complexes are unknown.

Oxides, sulfides, and alkoxides

The most important oxide is TiO2, which exists in three important polymorphs; anatase, brookite, and rutile. All of these are white diamagnetic solids, although mineral samples can appear dark (see rutile). They adopt polymeric structures in which Ti is surrounded by six oxide ligands that link to other Ti centers.

The term titanates usually refers to titanium(IV) compounds, as represented by barium titanate (BaTiO3). With a perovskite structure, this material exhibits piezoelectric properties and is used as a transducer in the interconversion of sound and electricity.[11] Many minerals are titanates, e.g. ilmenite (FeTiO3). Star sapphires and rubies get their asterism (star-forming shine) from the presence of titanium dioxide impurities.[17]

A variety of reduced oxides (suboxides) of titanium are known, mainly reduced stoichiometries of titanium dioxide obtained by atmospheric plasma spraying.Ti3O5, described as a Ti(IV)-Ti(III) species, is a purple semiconductor produced by reduction of TiO2 with hydrogen at high temperatures,[27] and is used industrially when surfaces need to be vapour-coated with titanium dioxide: it evaporates as pure TiO, whereas TiO2 evaporates as a mixture of oxides and deposits coatings with variable refractive index.[28] Also known is Ti2O3, with the corundum structure, and TiO, with the rock salt structure, although often nonstoichiometric.[29]

The alkoxides of titanium(IV), prepared by reacting TiCl4 with alcohols, are colourless compounds that convert to the dioxide on reaction with water. They are industrially useful for depositing solid TiO2 via the sol-gel process. Titanium isopropoxide is used in the synthesis of chiral organic compounds via the Sharpless epoxidation.

Titanium forms a variety of sulfides, but only TiS2 has attracted significant interest. It adopts a layered structure and was used as a cathode in the development of lithium batteries. Because Ti(IV) is a "hard cation", the sulfides of titanium are unstable and tend to hydrolyze to the oxide with release of hydrogen sulfide.

Nitrides and carbides

Titanium nitride (TiN) is a member of a family of refractory transition metal nitrides and exhibits properties similar to both covalent compounds including; thermodynamic stability, extreme hardness, thermal/electrical conductivity, and a high melting point.[30] TiN has a hardness equivalent to sapphire and carborundum (9.0 on the Mohs Scale),[31] and is often used to coat cutting tools, such as drill bits.[32] It is also used as a gold-colored decorative finish and as a barrier metal in semiconductor fabrication.[33] Titanium carbide, which is also very hard, is found in cutting tools and coatings.[34]

TiCl3
Titanium(III) compounds are characteristically violet, illustrated by this aqueous solution of titanium trichloride.

Halides

Titanium tetrachloride (titanium(IV) chloride, TiCl4[35]) is a colorless volatile liquid (commercial samples are yellowish) that, in air, hydrolyzes with spectacular emission of white clouds. Via the Kroll process, TiCl4 is produced in the conversion of titanium ores to titanium dioxide, e.g., for use in white paint.[36] It is widely used in organic chemistry as a Lewis acid, for example in the Mukaiyama aldol condensation.[37] In the van Arkel process, titanium tetraiodide (TiI4) is generated in the production of high purity titanium metal.

Titanium(III) and titanium(II) also form stable chlorides. A notable example is titanium(III) chloride (TiCl3), which is used as a catalyst for production of polyolefins (see Ziegler–Natta catalyst) and a reducing agent in organic chemistry.

Organometallic complexes

Owing to the important role of titanium compounds as polymerization catalyst, compounds with Ti-C bonds have been intensively studied. The most common organotitanium complex is titanocene dichloride ((C5H5)2TiCl2). Related compounds include Tebbe's reagent and Petasis reagent. Titanium forms carbonyl complexes, e.g. (C5H5)2Ti(CO)2.[38]

Anticancer therapy

Following the success of platinum-based chemotherapy, titanium(IV) complexes were among the first non-platinum compounds to be tested for cancer treatment. The advantage of titanium compounds lies in their high efficacy and low toxicity. In biological environments, hydrolysis leads to the safe and inert titanium dioxide. Despite these advantages the first candidate compounds failed clinical trials. Further development resulted in the creation of potentially effective, selective, and stable titanium-based drugs.[39] Their mode of action is not yet well understood.

History

Titanium was discovered in 1791 by the clergyman and amateur geologist, William Gregor, as an inclusion of a mineral in Cornwall, Great Britain.[40] Gregor recognized the presence of a new element in ilmenite[8] when he found black sand by a stream and noticed the sand was attracted by a magnet.[40] Analyzing the sand, he determined the presence of two metal oxides: iron oxide (explaining the attraction to the magnet) and 45.25% of a white metallic oxide he could not identify.[21] Realizing that the unidentified oxide contained a metal that did not match any known element, Gregor reported his findings to the Royal Geological Society of Cornwall and in the German science journal Crell's Annalen.[40][41][42]

Around the same time, Franz-Joseph Müller von Reichenstein produced a similar substance, but could not identify it.[8] The oxide was independently rediscovered in 1795 by Prussian chemist Martin Heinrich Klaproth in rutile from Boinik (German name Bajmócska), a village in Hungary (now Bojničky in Slovakia).[40][43] Klaproth found that it contained a new element and named it for the Titans of Greek mythology.[23] After hearing about Gregor's earlier discovery, he obtained a sample of manaccanite and confirmed that it contained titanium.

The currently known processes for extracting titanium from its various ores are laborious and costly; it is not possible to reduce the ore by heating with carbon (as in iron smelting) because titanium combines with the carbon to produce titanium carbide.[40] Pure metallic titanium (99.9%) was first prepared in 1910 by Matthew A. Hunter at Rensselaer Polytechnic Institute by heating TiCl4 with sodium at 700–800 °C under great pressure[44] in a batch process known as the Hunter process.[7] Titanium metal was not used outside the laboratory until 1932 when William Justin Kroll proved that it can be produced by reducing titanium tetrachloride (TiCl4) with calcium.[45] Eight years later he refined this process with magnesium and even sodium in what became known as the Kroll process.[45] Although research continues into more efficient and cheaper processes (e.g., FFC Cambridge, Armstrong), the Kroll process is still used for commercial production.[7][8]

TitaniumMetal jpg
Titanium sponge, made by the Kroll process

Titanium of very high purity was made in small quantities when Anton Eduard van Arkel and Jan Hendrik de Boer discovered the iodide, or crystal bar, process in 1925, by reacting with iodine and decomposing the formed vapours over a hot filament to pure metal.[46]

In the 1950s and 1960s, the Soviet Union pioneered the use of titanium in military and submarine applications[44] (Alfa class and Mike class)[47] as part of programs related to the Cold War.[48] Starting in the early 1950s, titanium came into use extensively in military aviation, particularly in high-performance jets, starting with aircraft such as the F-100 Super Sabre and Lockheed A-12 and SR-71.

Recognizing the strategic importance of titanium,[49] the U.S. Department of Defense supported early efforts of commercialization.[50]

Throughout the period of the Cold War, titanium was considered a strategic material by the U.S. government, and a large stockpile of titanium sponge was maintained by the Defense National Stockpile Center, which was finally depleted in the 2000s.[51] According to 2006 data, the world's largest producer, Russian-based VSMPO-AVISMA, was estimated to account for about 29% of the world market share.[52] As of 2015, titanium sponge metal was produced in seven countries: China, Japan, Russia, Kazakhstan, the US, Ukraine, and India. (in order of output).[53][54]

In 2006, the U.S. Defense Advanced Research Projects Agency (DARPA) awarded $5.7 million to a two-company consortium to develop a new process for making titanium metal powder. Under heat and pressure, the powder can be used to create strong, lightweight items ranging from armour plating to components for the aerospace, transport, and chemical processing industries.[55]

Production and fabrication

TitaniumUSGOV
Titanium (mineral concentrate)
Titanium products
Basic titanium products: plate, tube, rods, and powder

The processing of titanium metal occurs in four major steps:[56] reduction of titanium ore into "sponge", a porous form; melting of sponge, or sponge plus a master alloy to form an ingot; primary fabrication, where an ingot is converted into general mill products such as billet, bar, plate, sheet, strip, and tube; and secondary fabrication of finished shapes from mill products.

Because it cannot be readily produced by reduction of its dioxide,[13] titanium metal is obtained by reduction of TiCl4 with magnesium metal in the Kroll process. The complexity of this batch production in the Kroll process explains the relatively high market value of titanium,[57] despite the Kroll process being less expensive than the Hunter process.[44] To produce the TiCl4 required by the Kroll process, the dioxide is subjected to carbothermic reduction in the presence of chlorine. In this process, the chlorine gas is passed over a red-hot mixture of rutile or ilmenite in the presence of carbon. After extensive purification by fractional distillation, the TiCl4 is reduced with 800 °C molten magnesium in an argon atmosphere.[11] Titanium metal can be further purified by the van Arkel–de Boer process, which involves thermal decomposition of titanium tetraiodide.

A more recently developed batch production method, the FFC Cambridge process,[58] consumes titanium dioxide powder (a refined form of rutile) as feedstock and produces titanium metal, either powder or sponge. The process involves fewer steps than the Kroll process and takes less time.[59] If mixed oxide powders are used, the product is an alloy.

Common titanium alloys are made by reduction. For example, cuprotitanium (rutile with copper added is reduced), ferrocarbon titanium (ilmenite reduced with coke in an electric furnace), and manganotitanium (rutile with manganese or manganese oxides) are reduced.[60]

2 FeTiO3 + 7 Cl2 + 6 C → 2 TiCl4 + 2 FeCl3 + 6 CO (900 °C)
TiCl4 + 2 Mg → 2 MgCl2 + Ti (1,100 °C)

About fifty grades of titanium and titanium alloys are designed and currently used, although only a couple of dozen are readily available commercially.[61] The ASTM International recognizes 31 grades of titanium metal and alloys, of which grades one through four are commercially pure (unalloyed). Those four vary in tensile strength as a function of oxygen content, with grade 1 being the most ductile (lowest tensile strength with an oxygen content of 0.18%), and grade 4 the least ductile (highest tensile strength with an oxygen content of 0.40%).[17] The remaining grades are alloys, each designed for specific properties of ductility, strength, hardness, electrical resistivity, creep resistance, specific corrosion resistance, and combinations thereof.[62]

In addition to the ASTM specifications, titanium alloys are also produced to meet aerospace and military specifications (SAE-AMS, MIL-T), ISO standards, and country-specific specifications, as well as proprietary end-user specifications for aerospace, military, medical, and industrial applications.[63]

Titanium powder is manufactured using a flow production process known as the Armstrong process[64] that is similar to the batch production Hunter process. A stream of titanium tetrachloride gas is added to a stream of molten sodium metal; the products (sodium chloride salt and titanium particles) is filtered from the extra sodium. Titanium is then separated from the salt by water washing. Both sodium and chlorine are recycled to produce and process more titanium tetrachloride.[65]

All welding of titanium must be done in an inert atmosphere of argon or helium to shield it from contamination with atmospheric gases (oxygen, nitrogen, and hydrogen).[15] Contamination causes a variety of conditions, such as embrittlement, which reduce the integrity of the assembly welds and lead to joint failure.

Commercially pure flat product (sheet, plate) can be formed readily, but processing must take into account the fact that the metal has a "memory" and tends to spring back. This is especially true of certain high-strength alloys.[66][67] Titanium cannot be soldered without first pre-plating it in a metal that is solderable.[68] The metal can be machined with the same equipment and the same processes as stainless steel.[15]

Applications

Titanzylinder
A titanium cylinder of "grade 2" quality

Titanium is used in steel as an alloying element (ferro-titanium) to reduce grain size and as a deoxidizer, and in stainless steel to reduce carbon content.[6] Titanium is often alloyed with aluminium (to refine grain size), vanadium, copper (to harden), iron, manganese, molybdenum, and other metals.[69] Titanium mill products (sheet, plate, bar, wire, forgings, castings) find application in industrial, aerospace, recreational, and emerging markets. Powdered titanium is used in pyrotechnics as a source of bright-burning particles.

Pigments, additives, and coatings

Titanium(IV) oxide
Titanium dioxide is the most commonly used compound of titanium

About 95% of all titanium ore is destined for refinement into titanium dioxide (TiO
2
), an intensely white permanent pigment used in paints, paper, toothpaste, and plastics.[20] It is also used in cement, in gemstones, as an optical opacifier in paper,[70] and a strengthening agent in graphite composite fishing rods and golf clubs.

TiO
2
pigment is chemically inert, resists fading in sunlight, and is very opaque: it imparts a pure and brilliant white colour to the brown or grey chemicals that form the majority of household plastics.[8] In nature, this compound is found in the minerals anatase, brookite, and rutile.[6] Paint made with titanium dioxide does well in severe temperatures and marine environments.[8] Pure titanium dioxide has a very high index of refraction and an optical dispersion higher than diamond.[7] In addition to being a very important pigment, titanium dioxide is also used in sunscreens.[13]

Aerospace and marine

Because titanium alloys have high tensile strength to density ratio,[11] high corrosion resistance,[7] fatigue resistance, high crack resistance,[71] and ability to withstand moderately high temperatures without creeping, they are used in aircraft, armour plating, naval ships, spacecraft, and missiles.[7][8] For these applications, titanium is alloyed with aluminium, zirconium, nickel,[72] vanadium, and other elements to manufacture a variety of components including critical structural parts, fire walls, landing gear, exhaust ducts (helicopters), and hydraulic systems. In fact, about two thirds of all titanium metal produced is used in aircraft engines and frames.[73] The titanium 6AL-4V alloy accounts for almost 50% of all alloys used in aircraft applications.[74]

The Lockheed A-12 and its development the SR-71 "Blackbird" were two of the first aircraft frames where titanium was used, paving the way for much wider use in modern military and commercial aircraft. An estimated 59 metric tons (130,000 pounds) are used in the Boeing 777, 45 in the Boeing 747, 18 in the Boeing 737, 32 in the Airbus A340, 18 in the Airbus A330, and 12 in the Airbus A320. The Airbus A380 may use 77 metric tons, including about 11 tons in the engines.[75] In aero engine applications, titanium is used for rotors, compressor blades, hydraulic system components, and nacelles. An early use in jet engines was for the Orenda Iroquois in the 1950s.[76]:412

Because titanium is resistant to corrosion by sea water, it is used to make propeller shafts, rigging, and heat exchangers in desalination plants;[7] heater-chillers for salt water aquariums, fishing line and leader, and divers' knives. Titanium is used in the housings and components of ocean-deployed surveillance and monitoring devices for science and the military. The former Soviet Union developed techniques for making submarines with hulls of titanium alloys[77] forging titanium in huge vacuum tubes.[72]

Titanium is used in the walls of the Juno spacecraft's vault to shield on-board electronics.[78]

Industrial

Hochreines Titan (99.999) mit sichtbarer Kristallstruktur
High-purity (99.999%) titanium with visible crystallites

Welded titanium pipe and process equipment (heat exchangers, tanks, process vessels, valves) are used in the chemical and petrochemical industries primarily for corrosion resistance. Specific alloys are used in oil and gas downhole applications and nickel hydrometallurgy for their high strength (e. g.: titanium beta C alloy), corrosion resistance, or both. The pulp and paper industry uses titanium in process equipment exposed to corrosive media, such as sodium hypochlorite or wet chlorine gas (in the bleachery).[79] Other applications include ultrasonic welding, wave soldering,[80] and sputtering targets.[81]

Titanium tetrachloride (TiCl4), a colorless liquid, is important as an intermediate in the process of making TiO2 and is also used to produce the Ziegler–Natta catalyst. Titanium tetrachloride is also used to iridize glass and, because it fumes strongly in moist air, it is used to make smoke screens.[13]

Consumer and architectural

Titanium metal is used in automotive applications, particularly in automobile and motorcycle racing where low weight and high strength and rigidity are critical.[82] The metal is generally too expensive for the general consumer market, though some late model Corvettes have been manufactured with titanium exhausts,[83] and a Corvette Z06's LT4 supercharged engine uses lightweight, solid titanium intake valves for greater strength and resistance to heat.[84]

Titanium is used in many sporting goods: tennis rackets, golf clubs, lacrosse stick shafts; cricket, hockey, lacrosse, and football helmet grills, and bicycle frames and components. Although not a mainstream material for bicycle production, titanium bikes have been used by racing teams and adventure cyclists.[85]

Titanium alloys are used in spectacle frames that are rather expensive but highly durable, long lasting, light weight, and cause no skin allergies. Many backpackers use titanium equipment, including cookware, eating utensils, lanterns, and tent stakes. Though slightly more expensive than traditional steel or aluminium alternatives, titanium products can be significantly lighter without compromising strength. Titanium horseshoes are preferred to steel by farriers because they are lighter and more durable.[86]

El Guggenheim vizcaíno. (1454058701)
Titanium cladding of Frank Gehry's Guggenheim Museum, Bilbao

Titanium has occasionally been used in architecture. The 42.5 m (139 ft) Monument to Yuri Gagarin, the first man to travel in space (55°42′29.7″N 37°34′57.2″E / 55.708250°N 37.582556°E), as well as the 110 m (360 ft) Monument to the Conquerors of Space on top of the Cosmonaut Museum in Moscow are made of titanium for the metal's attractive colour and association with rocketry.[87][88] The Guggenheim Museum Bilbao and the Cerritos Millennium Library were the first buildings in Europe and North America, respectively, to be sheathed in titanium panels.[73] Titanium sheathing was used in the Frederic C. Hamilton Building in Denver, Colorado.[89]

Because of titanium's superior strength and light weight relative to other metals (steel, stainless steel, and aluminium), and because of recent advances in metalworking techniques, its use has become more widespread in the manufacture of firearms. Primary uses include pistol frames and revolver cylinders. For the same reasons, it is used in the body of laptop computers (for example, in Apple's PowerBook line).[90]

Some upmarket lightweight and corrosion-resistant tools, such as shovels and flashlights, are made of titanium or titanium alloys.

Jewelry

Anodized titanium table
Relation between voltage and color for anodized titanium. (Cateb, 2010).

Because of its durability, titanium has become more popular for designer jewelry (particularly, titanium rings).[86] Its inertness makes it a good choice for those with allergies or those who will be wearing the jewelry in environments such as swimming pools. Titanium is also alloyed with gold to produce an alloy that can be marketed as 24-karat gold because the 1% of alloyed Ti is insufficient to require a lesser mark. The resulting alloy is roughly the hardness of 14-karat gold and is more durable than pure 24-karat gold.[91]

Titanium's durability, light weight, and dent and corrosion resistance make it useful for watch cases.[86] Some artists work with titanium to produce sculptures, decorative objects and furniture.[92]

Titanium may be anodized to vary the thickness of the surface oxide layer, causing optical interference fringes and a variety of bright colors.[93] With this coloration and chemical inertness, titanium is a popular metal for body piercing.[94]

Titanium has a minor use in dedicated non-circulating coins and medals. In 1999, Gibraltar released the world's first titanium coin for the millennium celebration.[95] The Gold Coast Titans, an Australian rugby league team, award a medal of pure titanium to their player of the year.[96]

Medical

Because titanium is biocompatible (non-toxic and not rejected by the body), it has many medical uses, including surgical implements and implants, such as hip balls and sockets (joint replacement) and dental implants that can stay in place for up to 20 years.[40] The titanium is often alloyed with about 4% aluminium or 6% Al and 4% vanadium.[97]

Titanium plaatje voor pols
Medical screws and plate used for repair fracture of the wrist, scale is in centimeters.

Titanium has the inherent ability to osseointegrate, enabling use in dental implants that can last for over 30 years. This property is also useful for orthopedic implant applications.[40] These benefit from titanium's lower modulus of elasticity (Young's modulus) to more closely match that of the bone that such devices are intended to repair. As a result, skeletal loads are more evenly shared between bone and implant, leading to a lower incidence of bone degradation due to stress shielding and periprosthetic bone fractures, which occur at the boundaries of orthopedic implants. However, titanium alloys' stiffness is still more than twice that of bone, so adjacent bone bears a greatly reduced load and may deteriorate.[98][99]

Because titanium is non-ferromagnetic, patients with titanium implants can be safely examined with magnetic resonance imaging (convenient for long-term implants). Preparing titanium for implantation in the body involves subjecting it to a high-temperature plasma arc which removes the surface atoms, exposing fresh titanium that is instantly oxidized.[40]

Titanium is used for the surgical instruments used in image-guided surgery, as well as wheelchairs, crutches, and any other products where high strength and low weight are desirable.

Titanium dioxide nanoparticles are widely used in electronics and the delivery of pharmaceuticals and cosmetics.[100]

Nuclear waste storage

Because of its corrosion resistance, containers made of titanium have been studied for the long-term storage of nuclear waste. Containers lasting more than 100,000 years are thought possible with manufacturing conditions that minimize material defects.[101] A titanium "drip shield" could also be installed over containers of other types to enhance their longevity.[102]

Bioremediation

The fungal species Marasmius oreades and Hypholoma capnoides can bioconvert titanium in titanium polluted soils.[103]

Precautions

Kopiva
Nettles contain up to 80 parts per million of titanium.

Titanium is non-toxic even in large doses and does not play any natural role inside the human body.[23] An estimated quantity of 0.8 milligrams of titanium is ingested by humans each day, but most passes through without being absorbed in the tissues.[23] It does, however, sometimes bio-accumulate in tissues that contain silica. One study indicates a possible connection between titanium and yellow nail syndrome.[104] An unknown mechanism in plants may use titanium to stimulate the production of carbohydrates and encourage growth. This may explain why most plants contain about 1 part per million (ppm) of titanium, food plants have about 2 ppm, and horsetail and nettle contain up to 80 ppm.[23]

As a powder or in the form of metal shavings, titanium metal poses a significant fire hazard and, when heated in air, an explosion hazard.[105] Water and carbon dioxide are ineffective for extinguishing a titanium fire; Class D dry powder agents must be used instead.[8]

When used in the production or handling of chlorine, titanium should not be exposed to dry chlorine gas because it may result in a titanium–chlorine fire.[106] Even wet chlorine presents a fire hazard when extreme weather conditions cause unexpected drying.

Titanium can catch fire when a fresh, non-oxidized surface comes in contact with liquid oxygen.[107] Fresh metal may be exposed when the oxidized surface is struck or scratched with a hard object, or when mechanical strain causes a crack. This poses a limitation to its use in liquid oxygen systems, such as those in the aerospace industry. Because titanium tubing impurities can cause fires when exposed to oxygen, titanium is prohibited in gaseous oxygen respiration systems. Steel tubing is used for high pressure systems (3,000 p.s.i.) and aluminium tubing for low pressure systems.

See also

References

  1. ^ "titanium - definition of titanium in English | Oxford Dictionaries". Oxford University Press. 2017. Retrieved 2017-03-28.
  2. ^ Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  3. ^ Andersson, N.; et al. (2003). "Emission spectra of TiH and TiD near 938 nm" (PDF). J. Chem. Phys. 118: 10543. Bibcode:2003JChPh.118.3543A. doi:10.1063/1.1539848.
  4. ^ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
  5. ^ Andersson, N.; et al. (2003). "Emission spectra of TiH and TiD near 938 nm" (PDF). J. Chem. Phys. 118: 10543. Bibcode:2003JChPh.118.3543A. doi:10.1063/1.1539848.
  6. ^ a b c d e f g h i "Titanium". Encyclopædia Britannica. 2006. Retrieved 29 December 2006.
  7. ^ a b c d e f g h i j k l m Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
  8. ^ a b c d e f g h i Krebs, Robert E. (2006). The History and Use of Our Earth's Chemical Elements: A Reference Guide (2nd ed.). Westport, CT: Greenwood Press. ISBN 978-0-313-33438-2.
  9. ^ Donachie 1988, p. 11
  10. ^ a b Barksdale 1968, p. 738
  11. ^ a b c d e f "Titanium". Columbia Encyclopedia (6th ed.). New York: Columbia University Press. 2000–2006. ISBN 978-0-7876-5015-5. Archived from the original on 18 November 2011.CS1 maint: BOT: original-url status unknown (link)
  12. ^ a b c Barbalace, Kenneth L. (2006). "Periodic Table of Elements: Ti – Titanium". Retrieved 26 December 2006.
  13. ^ a b c d e Stwertka, Albert (1998). "Titanium". Guide to the Elements (Revised ed.). Oxford University Press. pp. 81–82. ISBN 978-0-19-508083-4.
  14. ^ Donachie 1988, Appendix J, Table J.2
  15. ^ a b c d e Barksdale 1968, p. 734
  16. ^ Puigdomenech, Ignasi (2004) Hydra/Medusa Chemical Equilibrium Database and Plotting Software, KTH Royal Institute of Technology.
  17. ^ a b c d e Emsley 2001, p. 453
  18. ^ Casillas, N.; Charlebois, S.; Smyrl, W. H.; White, H. S. (1994). "Pitting Corrosion of Titanium". J. Electrochem. Soc. 141 (3): 636–642. doi:10.1149/1.2054783.
  19. ^ Forrest, A. L. (1981). "Effects of Metal Chemistry on Behavior of Titanium in Industrial Applications". Industrial Applications of Titanium and Zirconium. p. 112.
  20. ^ a b c d United States Geological Survey. "USGS Minerals Information: Titanium".
  21. ^ a b c Barksdale 1968, p. 732
  22. ^ Buettner, K. M.; Valentine, A. M. (2012). "Bioinorganic Chemistry of Titanium". Chemical Reviews. 112 (3): 1863. doi:10.1021/cr1002886. PMID 22074443.
  23. ^ a b c d e Emsley 2001, p. 451
  24. ^ Titanium. Mindat
  25. ^ Greenwood 1997, p. 958
  26. ^ Greenwood 1997, p. 970
  27. ^ Liu, Gang; Huang, Wan-Xia; Yi, Yong (26 June 2013). "Preparation and Optical Storage Properties of λTi3O5 Powder". Journal of Inorganic Materials (in Chinese). 28 (4): 425–430. doi:10.3724/SP.J.1077.2013.12309.
  28. ^ Bonardi, Antonio; Pühlhofer, Gerd; Hermanutz, Stephan; Santangelo, Andrea (2014). "A new solution for mirror coating in $γ$-ray Cherenkov Astronomy" (Submitted manuscript). Experimental Astronomy. 38: 1–9. arXiv:1406.0622. Bibcode:2014ExA....38....1B. doi:10.1007/s10686-014-9398-x.
  29. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 962. ISBN 0-08-037941-9.
  30. ^ Saha, Naresh (1992). "Titanium nitride oxidation chemistry: An x-ray photoelectron spectroscopy study". Journal of Applied Physics. no. 7 (7): 3072–3079. Bibcode:1992JAP....72.3072S. doi:10.1063/1.351465.
  31. ^ Schubert, E.F. "The hardness scale introduced by Friederich Mohs" (PDF). Archived from the original on 3 June 2010.CS1 maint: BOT: original-url status unknown (link)
  32. ^ Truini, Joseph (May 1988). "Drill Bits". Popular Mechanics. 165 (5): 91. ISSN 0032-4558.
  33. ^ Baliga, B. Jayant (2005). Silicon carbide power devices. World Scientific. p. 91. ISBN 978-981-256-605-8.
  34. ^ "Titanium carbide product information". H. C. Starck. Retrieved 16 November 2015.
  35. ^ Seong, S.; et al. (2009). Titanium: industrial base, price trends, and technology initiatives. Rand Corporation. p. 10. ISBN 978-0-8330-4575-1.
  36. ^ Johnson, Richard W. (1998). The Handbook of Fluid Dynamics. Springer. pp. 38–21. ISBN 978-3-540-64612-9.
  37. ^ Coates, Robert M.; Paquette, Leo A. (2000). Handbook of Reagents for Organic Synthesis. John Wiley and Sons. p. 93. ISBN 978-0-470-85625-3.
  38. ^ Hartwig, J. F. (2010) Organotransition Metal Chemistry, from Bonding to Catalysis. University Science Books: New York. ISBN 189138953X
  39. ^ Tshuva, Edit Y.; Miller, Maya (2018). "Chapter 8. Coordination Complexes of Titanium(IV) for Anticancer Therapy". In Sigel, Astrid; Sigel, Helmut; Freisinger, Eva; Sigel, Roland K. O. Metallo-Drugs: Development and Action of Anticancer Agents. 18. Berlin: de Gruyter GmbH. pp. 219–250. doi:10.1515/9783110470734-014. ISBN 9783110470734.
  40. ^ a b c d e f g h Emsley 2001, p. 452
  41. ^ Gregor, William (1791) "Beobachtungen und Versuche über den Menakanit, einen in Cornwall gefundenen magnetischen Sand" (Observations and experiments regarding menaccanite [i.e., ilmenite], a magnetic sand found in Cornwall), Chemische Annalen …, 1, pp. 40–54, 103–119.
  42. ^ Gregor, William (1791) "Sur le menakanite, espèce de sable attirable par l'aimant, trouvé dans la province de Cornouilles" (On menaccanite, a species of magnetic sand, found in the county of Cornwall), Observations et Mémoires sur la Physique, 39: 72–78, 152–160.
  43. ^ Klaproth, Martin Heinrich (1795) "Chemische Untersuchung des sogenannten hungarischen rothen Schörls" (Chemical investigation of the so-called Hungarian red tourmaline [rutile]) in: Beiträge zur chemischen Kenntniss der Mineralkörper (Contributions to the chemical knowledge of mineral substances), vol. 1, (Berlin, (Germany): Heinrich August Rottmann, 233–244. From page 244: "Diesem zufolge will ich den Namen für die gegenwärtige metallische Substanz, gleichergestalt wie bei dem Uranium geschehen, aus der Mythologie, und zwar von den Ursöhnen der Erde, den Titanen, entlehnen, und benenne also diese neue Metallgeschlecht: Titanium; … " (By virtue of this I will derive the name for the present metallic substance — as happened similarly in the case of uranium — from mythology, namely from the first sons of the Earth, the Titans, and thus [I] name this new species of metal: "titanium"; … )
  44. ^ a b c Roza 2008, p. 9
  45. ^ a b Greenwood 1997, p. 955
  46. ^ van Arkel, A. E.; de Boer, J. H. (1925). "Preparation of pure titanium, zirconium, hafnium, and thorium metal". Zeitschrift für anorganische und allgemeine Chemie. 148: 345–50. doi:10.1002/zaac.19251480133.
  47. ^ Yanko, Eugene; Omsk VTTV Arms Exhibition and Military Parade JSC (2006). "Submarines: general information". Retrieved 2 February 2015.
  48. ^ Stainless Steel World (July–August 2001). "VSMPO Stronger Than Ever" (PDF). KCI Publishing B.V. pp. 16–19. Retrieved 2 January 2007.
  49. ^ National Materials Advisory Board, Commission on Engineering and Technical Systems (CETS), National Research Council (1983). Titanium: Past, Present, and Future. Washington, D.C.: national Academy Press. p. R9. NMAB-392.CS1 maint: Multiple names: authors list (link)
  50. ^ "Titanium Metals Corporation. Answers.com. Encyclopedia of Company Histories". Answers Corporation. 2006. Retrieved 2 January 2007.
  51. ^ Defense National Stockpile Center (2008). Strategic and Critical Materials Report to the Congress. Operations under the Strategic and Critical Materials Stock Piling Act during the Period October 2007 through September 2008 (PDF). United States Department of Defense. p. 3304. Archived from the original on 11 February 2010.CS1 maint: BOT: original-url status unknown (link)
  52. ^ Bush, Jason (15 February 2006). "Boeing's Plan to Land Aeroflot". BusinessWeek. Archived from the original on 9 April 2009. Retrieved 29 December 2006.CS1 maint: Unfit url (link)
  53. ^ "Roskill Information Services: Global Supply of Titanium is Forecast to Increase", Titanium Metal: Market Outlook to 2015 (5th edition, 2010).
  54. ^ "ISRO's titanium sponge plant in Kerala fully commissioned". timesofindia-economictimes. Retrieved 2015-11-08.
  55. ^ DuPont (12 September 2006). "U.S. Defense Agency Awards $5.7 Million to DuPont and MER Corporation for New Titanium Metal Powder Process" (Press release). Retrieved 1 August 2009.
  56. ^ Donachie 1988, Ch. 4
  57. ^ Barksdale 1968, p. 733
  58. ^ Chen, George Zheng; Fray, Derek J.; Farthing, Tom W. (2000). "Direct electrochemical reduction of titanium dioxide to titanium in molten calcium chloride". Nature. 407 (6802): 361–364. Bibcode:2000Natur.407..361C. doi:10.1038/35030069. PMID 11014188.
  59. ^ Roza 2008, p. 23
  60. ^ "Titanium". Microsoft Encarta. 2005. Archived from the original on 27 October 2006. Retrieved 29 December 2006.
  61. ^ Donachie 1988, p. 16, Appendix J
  62. ^ ASTM International (2006). Annual Book of ASTM Standards (Volume 02.04: Non-ferrous Metals). West Conshohocken, PA: ASTM International. section 2. ISBN 978-0-8031-4086-8. ASTM International (1998). Annual Book of ASTM Standards (Volume 13.01: Medical Devices; Emergency Medical Services). West Conshohocken, PA: ASTM International. sections 2 & 13. ISBN 978-0-8031-2452-3.
  63. ^ Donachie 1988, pp. 13–16, Appendices H and J
  64. ^ Roza 2008, p. 25
  65. ^ "Titanium". The Essential Chemical Industry online. York, UK: CIEC Promoting Science at the University of York. 15 January 2015.
  66. ^ AWS G2.4/G2.4M:2007 Guide for the Fusion Welding of Titanium and Titanium Alloys. Miami: American Welding Society. 2006. Archived from the original on 10 December 2010.CS1 maint: BOT: original-url status unknown (link)
  67. ^ Titanium Metals Corporation (1997). Titanium design and fabrication handbook for industrial applications. Dallas: Titanium Metals Corporation. Archived from the original on 9 February 2009.CS1 maint: BOT: original-url status unknown (link)
  68. ^ "Solderability". Retrieved 16 June 2011.
  69. ^ Hampel, Clifford A. (1968). The Encyclopedia of the Chemical Elements. Van Nostrand Reinhold. p. 738. ISBN 978-0-442-15598-8.
  70. ^ Smook, Gary A. (2002). Handbook for Pulp & Paper Technologists (3rd ed.). Angus Wilde Publications. p. 223. ISBN 978-0-9694628-5-9.
  71. ^ Moiseyev, Valentin N. (2006). Titanium Alloys: Russian Aircraft and Aerospace Applications. Taylor and Francis, LLC. p. 196. ISBN 978-0-8493-3273-9.
  72. ^ a b Kramer, Andrew E. (5 July 2013). "Titanium Fills Vital Role for Boeing and Russia". The New York Times. Retrieved 6 July 2013.
  73. ^ a b Emsley 2001, p. 454
  74. ^ Donachie 1988, p. 13
  75. ^ Sevan, Vardan (23 September 2006). "Rosoboronexport controls titanium in Russia". Sevanco Strategic Consulting. Archived from the original on 11 November 2012. Retrieved 26 December 2006.CS1 maint: Unfit url (link)
  76. ^ "Iroquois" a 1957 Flight article
  77. ^ "GlobalSecurity". GlobalSecurity.org. April 2006. Retrieved 23 April 2008.
  78. ^ Scharf, Caleb A. (June 17, 2016) The Jupiter Vault. Scientific American.
  79. ^ Donachie 1988, pp. 11–16
  80. ^ Kleefisch, E.W., ed. (1981). Industrial Application of Titanium and Zirconium. West Conshohocken, PA: ASTM International. ISBN 978-0-8031-0745-8.
  81. ^ Bunshah, Rointan F., ed. (2001). "Ch. 8". Handbook of Hard Coatings. Norwich, NY: William Andrew Inc. ISBN 978-0-8155-1438-1.
  82. ^ Bell, Tom; et al. (2001). Heat Treating. Proceedings of the 20th Conference, 9–12 October 2000. ASM International. p. 141. ISBN 978-0-87170-727-7.
  83. ^ National Corvette Museum (2006). "Titanium Exhausts". Archived from the original on 3 January 2013. Retrieved 26 December 2006.
  84. ^ Compact Powerhouse: Inside Corvette Z06’s LT4 Engine 650-hp supercharged 6.2L V-8 makes world-class power in more efficient package. media.gm.com. 20 August 2014
  85. ^ Davis, Joseph R. (1998). Metals Handbook. ASM International. p. 584. ISBN 978-0-87170-654-6.
  86. ^ a b c Donachie 1988, pp. 11, 255
  87. ^ Mike Gruntman (2004). Blazing the Trail: The Early History of Spacecraft and Rocketry. Reston, VA: American Institute of Aeronautics and Astronautics. p. 457. ISBN 978-1-56347-705-8.
  88. ^ Lütjering, Gerd; Williams, James Case (12 June 2007). "Appearance Related Applications". Titanium. ISBN 978-3-540-71397-5.
  89. ^ "Denver Art Museum, Frederic C. Hamilton Building". SPG Media. 2006. Retrieved 26 December 2006.
  90. ^ "Apple PowerBook G4 400 (Original – Ti) Specs". everymac.com. Retrieved 8 August 2009.
  91. ^ Gafner, G. (1989). "The development of 990 Gold-Titanium: its Production, use and Properties" (PDF). Gold Bulletin. 22 (4): 112–122. doi:10.1007/BF03214709. Archived from the original on 29 November 2010.CS1 maint: Unfit url (link)
  92. ^ "Fine Art and Functional Works in Titanium and Other Earth Elements". Archived from the original on 13 May 2008. Retrieved 8 August 2009.CS1 maint: BOT: original-url status unknown (link)
  93. ^ Alwitt, Robert S. (2002). "Electrochemistry Encyclopedia". Archived from the original on 2 July 2008. Retrieved 30 December 2006.CS1 maint: Unfit url (link)
  94. ^ "Body Piercing Safety". doctorgoodskin.com. Retrieved 1 August 2009.
  95. ^ "World Firsts | British Pobjoy Mint". www.pobjoy.com. Retrieved 2017-11-11.
  96. ^ Turgeon, Luke (20 September 2007). "Titanium Titan: Broughton immortalised". The Gold Coast Bulletin. Archived from the original on 28 September 2013.CS1 maint: Unfit url (link)
  97. ^ "Orthopaedic Metal Alloys". Totaljoints.info. Retrieved 27 September 2010.
  98. ^ "Titanium foams replace injured bones". Research News. 1 September 2010. Retrieved 27 September 2010.
  99. ^ Lavine, Marc S., Make no bones about titanium, Science Magazine, 2018.01.08, Volume 359, Issue 6372, pp. 173-174 DOI: 10.1126/science.359.6372.173-f
  100. ^ Pinsino, Annalisa; Russo, Roberta; Bonaventura, Rosa; Brunelli, Andrea; Marcomini, Antonio; Matranga, Valeria (2015-09-28). "Titanium dioxide nanoparticles stimulate sea urchin immune cell phagocytic activity involving TLR/p38 MAPK-mediated signalling pathway". Scientific Reports. 5: 14492. Bibcode:2015NatSR...514492P. doi:10.1038/srep14492. PMC 4585977. PMID 26412401.
  101. ^ Shoesmith, D. W.; Noel, J. J.; Hardie, D.; Ikeda, B. M. (2000). "Hydrogen Absorption and the Lifetime Performance of Titanium Nuclear Waste Containers". Corrosion Reviews. 18 (4–5). doi:10.1515/CORRREV.2000.18.4-5.331.
  102. ^ Carter, L. J.; Pigford, T. J. (2005). "Proof of Safety at Yucca Mountain". Science. 310 (5747): 447. doi:10.1126/science.1112786. PMID 16239463.
  103. ^ Elekes, Carmen Cristina; Busuioc, Gabriela. "The Mycoremediation of Metals Polluted Soils Using Wild Growing Species of Mushrooms" (PDF). Engineering Education. Archived from the original (PDF) on 3 March 2016. Retrieved 28 January 2014.
  104. ^ Berglund, Fredrik; Carlmark, Bjorn (October 2011). "Titanium, Sinusitis, and the Yellow Nail Syndrome". Biological Trace Element Research. 143 (1): 1–7. doi:10.1007/s12011-010-8828-5. PMC 3176400. PMID 20809268.
  105. ^ Cotell, Catherine Mary; Sprague, J. A.; Smidt, F. A. (1994). ASM Handbook: Surface Engineering (10th ed.). ASM International. p. 836. ISBN 978-0-87170-384-2.
  106. ^ Compressed Gas Association (1999). Handbook of compressed gases (4th ed.). Springer. p. 323. ISBN 978-0-412-78230-5.
  107. ^ Solomon, Robert E. (2002). Fire and Life Safety Inspection Manual. National Fire Prevention Association (8th ed.). Jones & Bartlett Publishers. p. 45. ISBN 978-0-87765-472-8.

Bibliography

  • Barksdale, Jelks (1968). "Titanium". In Clifford A. Hampel. The Encyclopedia of the Chemical Elements. New York: Reinhold Book Corporation. pp. 732–738. LCCN 68029938.
  • Donachie, Matthew J., Jr. (1988). TITANIUM: A Technical Guide. Metals Park, OH: ASM International. p. 11. ISBN 978-0-87170-309-5.
  • Emsley, John (2001). "Titanium". Nature's Building Blocks: An A-Z Guide to the Elements. Oxford, England, UK: Oxford University Press. ISBN 978-0-19-850340-8.
  • Flower, Harvey M. (2000). "Materials Science: A moving oxygen story". Nature. 407 (6802): 305–306. doi:10.1038/35030266. PMID 11014169.
  • Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 978-0-7506-3365-9.
  • Roza, Greg (2008). Titanium (First ed.). New York, NY: The Rosen Publishing Group. ISBN 978-1-4042-1412-5.

External links

Anodizing

Anodizing (also spelled anodising in British English) is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts.

The process is called anodizing because the part to be treated forms the anode electrode of an electrolytic cell. Anodizing increases resistance to corrosion and wear, and provides better adhesion for paint primers and glues than bare metal does. Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add interference effects to reflected light.

Anodizing is also used to prevent galling of threaded components and to make dielectric films for electrolytic capacitors. Anodic films are most commonly applied to protect aluminium alloys, although processes also exist for titanium, zinc, magnesium, niobium, zirconium, hafnium, and tantalum. Iron or carbon steel metal exfoliates when oxidized under neutral or alkaline microelectrolytic conditions; i.e., the iron oxide (actually ferric hydroxide or hydrated iron oxide, also known as rust) forms by anoxic anodic pits and large cathodic surface, these pits concentrate anions such as sulfate and chloride accelerating the underlying metal to corrosion. Carbon flakes or nodules in iron or steel with high carbon content (high-carbon steel, cast iron) may cause an electrolytic potential and interfere with coating or plating. Ferrous metals are commonly anodized electrolytically in nitric acid or by treatment with red fuming nitric acid to form hard black ferric oxide. This oxide remains conformal even when plated on wire and the wire is bent.

Anodizing changes the microscopic texture of the surface and the crystal structure of the metal near the surface. Thick coatings are normally porous, so a sealing process is often needed to achieve corrosion resistance. Anodized aluminium surfaces, for example, are harder than aluminium but have low to moderate wear resistance that can be improved with increasing thickness or by applying suitable sealing substances. Anodic films are generally much stronger and more adherent than most types of paint and metal plating, but also more brittle. This makes them less likely to crack and peel from aging and wear, but more susceptible to cracking from thermal stress.

Basalt

Basalt (US: , UK: ) is a mafic extrusive igneous rock formed from the rapid cooling of magnesium-rich and iron-rich lava exposed at or very near the surface of a terrestrial planet or a moon. More than 90% of all volcanic rock on Earth is basalt. Basalt lava has a low viscosity, due to its low silica content, resulting in rapid lava flows that can spread over great areas before cooling and solidification. Flood basalt describes the formation in a series of lava basalt flows.

Group 4 element

Group 4 is a group of elements in the periodic table.

It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it belongs to the broader grouping of the transition metals.

The three Group 4 elements that occur naturally are titanium, zirconium and hafnium. The first three members of the group share similar properties; all three are hard refractory metals under standard conditions. However, the fourth element rutherfordium (Rf), has been synthesized in the laboratory; none of its isotopes have been found occurring in nature. All isotopes of rutherfordium are radioactive. So far, no experiments in a supercollider have been conducted to synthesize the next member of the group, unpentoctium (Upo, element 158), and it is unlikely that they will be synthesized in the near future.

Ilmenite

Ilmenite, also known as manaccanite, is a titanium-iron oxide mineral with the idealized formula FeTiO3. It is a weakly magnetic black or steel-gray solid. From a commercial perspective, ilmenite is the most important ore of titanium. Ilmenite is the main source of titanium dioxide, which is used in paints, printing inks, fabrics, plastics, paper, sunscreen, food and cosmetics.

Isotopes of titanium

Naturally occurring titanium (22Ti) is composed of five stable isotopes; 46Ti, 47Ti, 48Ti, 49Ti and 50Ti with 48Ti being the most abundant (73.8% natural abundance). Twenty-one radioisotopes have been characterized, with the most stable being 44Ti with a half-life of 60 years, 45Ti with a half-life of 184.8 minutes, 51Ti with a half-life of 5.76 minutes, and 52Ti with a half-life of 1.7 minutes. All of the remaining radioactive isotopes have half-lives that are less than 33 seconds, and the majority of these have half-lives that are less than half a second.The isotopes of titanium range in atomic mass from 38.01 u (38Ti) to 62.99 u (63Ti). The primary decay mode before the most abundant stable isotope, 48Ti, is β+ and the primary mode after is β−. The primary decay products before 48Ti are scandium isotopes and the primary products after are vanadium isotopes.

Rutile

Rutile is a mineral composed primarily of titanium dioxide (TiO2).

Rutile is the most common natural form of TiO2. Other rarer polymorphs of TiO2 are known including anatase, and brookite.

Rutile has one of the highest refractive indices at visible wavelengths of any known crystal and also exhibits a particularly large birefringence and high dispersion. Owing to these properties, it is useful for the manufacture of certain optical elements, especially polarization optics, for longer visible and infrared wavelengths up to about 4.5 μm.

Natural rutile may contain up to 10% iron and significant amounts of niobium and tantalum. Rutile derives its name from the Latin rutilus, red, in reference to the deep red color observed in some specimens when viewed by transmitted light. Rutile was first described in 1803 by Abraham Gottlob Werner.

Titanium(II) oxide

Titanium(II) oxide (TiO) is an inorganic chemical compound of titanium and oxygen. It can be prepared from titanium dioxide and titanium metal at 1500 °C. It is non-stoichiometric in a range TiO0.7 to TiO1.3 and this is caused by vacancies of either Ti or O in the defect rock salt structure. In pure TiO 15% of both Ti and O sites are vacant. Careful annealing can cause ordering of the vacancies producing a monoclinic form which has 5 TiO units in the primitive cell that exhibits lower resistivity. A high temperature form with titanium atoms with trigonal prismatic coordination is also known. Acid solutions of TiO are stable for a short time then decompose to give hydrogen:

2Ti2+(aq) + 2H+(aq) → 2Ti3+(aq) + H2(g)Gas-phase TiO shows strong bands in the optical spectra of cool (M-type) stars. In 2017, TiO was detected in an exoplanet atmosphere for the first time. Additionally, evidence has been obtained for the presence of the diatomic molecule TiO in the interstellar medium.

Titanium(III) fluoride

Titanium(III) fluoride (TiF3) is a inorganic compound with the formula TiF3. It is a violet solid. It adopts a perovskite-like structure such that each Ti center has octahedral coordination geometry and each fluoride ligand is doubly bridging.It can be obtained by the reaction of titanium(III) oxide with hydrofluoric acid. This reaction reverses if the TiF3 is dissolved in water.

Titanium(III) oxide

Titanium(III) oxide (Ti2O3) is a chemical compound of titanium and oxygen. It is prepared by reacting titanium dioxide with titanium metal at 1600 °C.

Ti2O3 has the Al2O3, corundum structure. It is reactive with oxidising acids. At around 200 °C there is a transition from semiconducting to metallic conducting. Natural titanium(III) oxide is known as the extremely rare mineral tistarite.

Titanium (song)

"Titanium" is a song by French DJ and music producer David Guetta, featuring vocals by Australian recording artist Sia. Taken from Guetta's fifth studio album, Nothing but the Beat, the song was written by Sia, David Guetta, Giorgio Tuinfort and Afrojack. Production was also handled by Guetta, Tuinfort and Afrojack. "Titanium" was initially released for digital download on August 8, 2011, as the first of four promotional singles from the album. It was later released as the album's fourth single in December 2011. The song originally featured the vocals of American recording artist Mary J. Blige, whose version of the song leaked online in July 2011.

"Titanium" is a pop song which draws from the genres of house and urban-dance. The song's lyrics are about inner strength. Sia's vocals on "Titanium" received comparisons to those by Fergie and the song was also musically compared to Coldplay's work. Critics were positive towards the song and noted it as one of the standout tracks from Nothing but the Beat. "Titanium" attained top 10 positions in several major music markets, including Australia, Austria, Denmark, Finland, France, Germany, Hungary, Ireland, Italy, The Netherlands, New Zealand, Norway, Spain, Sweden, Switzerland and the United States. In the United Kingdom, it peaked at number one, becoming Guetta's fifth number-one single on the chart and Sia's first.

The song's accompanying music video premiered on December 21, 2011 but does not feature appearances by Guetta or Sia. Instead, the video focuses on a young boy, played by actor Ryan Lee, with supernatural powers. Along with other songs, "Titanium" was pulled from radio stations in the US after the Sandy Hook Elementary School shooting. The video, which has received over 1 billion views on YouTube as of January 26, 2019, premiered on 20 December 2011.

Titanium Man

The Titanium Man ("Chelovek-Titan") is the name of two fictional supervillains appearing in American comic books published by Marvel Comics. The original Titanium Man first appeared in Tales of Suspense #68 in 1965 and was created by Stan Lee and Don Heck.

Titanium alloy

Titanium alloys are metals that contain a mixture of titanium and other chemical elements. Such alloys have very high tensile strength and toughness (even at extreme temperatures). They are light in weight, have extraordinary corrosion resistance and the ability to withstand extreme temperatures. However, the high cost of both raw materials and processing limit their use to military applications, aircraft, spacecraft, bicycles, medical devices, jewelry, highly stressed components such as connecting rods on expensive sports cars and some premium sports equipment and consumer electronics.

Although "commercially pure" titanium has acceptable mechanical properties and has been used for orthopedic and dental implants, for most applications titanium is alloyed with small amounts of aluminium and vanadium, typically 6% and 4% respectively, by weight. This mixture has a solid solubility which varies dramatically with temperature, allowing it to undergo precipitation strengthening. This heat treatment process is carried out after the alloy has been worked into its final shape but before it is put to use, allowing much easier fabrication of a high-strength product.

Titanium dioxide

Titanium dioxide, also known as titanium(IV) oxide or titania, is the naturally occurring oxide of titanium, chemical formula TiO2. When used as a pigment, it is called titanium white, Pigment White 6 (PW6), or CI 77891. Generally, it is sourced from ilmenite, rutile and anatase. It has a wide range of applications, including paint, sunscreen and food coloring. When used as a food coloring, it has E number E171. World production in 2014 exceeded 9 million metric tons. It has been estimated that titanium dioxide is used in two-thirds of all pigments, and the oxide has been valued at $13.2 billion.

Titanium hydride

Titanium hydride normally refers to the inorganic compound TiH2 and related nonstoichiometric materials. It is commercially available as a stable grey/black powder, which is used as an additive in the production of Alnico sintered magnets, in the sintering of powdered metals, the production of metal foam, the production of powdered titanium metal and in pyrotechnics.

Titanium nitride

Titanium nitride (TiN) (sometimes known as tinite) is an extremely hard ceramic material, often used as a coating on titanium alloys, steel, carbide, and aluminium components to improve the substrate's surface properties.

Applied as a thin coating, TiN is used to harden and protect cutting and sliding surfaces, for decorative purposes (due to its golden appearance), and as a non-toxic exterior for medical implants. In most applications a coating of less than 5 micrometres (0.00020 in) is applied.

Titanium oxide

Titanium oxide may refer to:

Titanium dioxide (titanium(IV) oxide), TiO2

Titanium(II) oxide (titanium monoxide), TiO, a non-stoichiometric oxide

Titanium(III) oxide (dititanium trioxide), Ti2O3

Ti3O

Ti2O

δ-TiOx (x= 0.68 - 0.75)

TinO2n−1 where n ranges from 3–9 inclusive, e.g. Ti3O5, Ti4O7, etc.

Titanium tetrachloride

Titanium tetrachloride is the inorganic compound with the formula TiCl4. It is an important intermediate in the production of titanium metal and the pigment titanium dioxide. TiCl4 is a volatile liquid. Upon contact with humid air, it forms spectacular opaque clouds of titanium dioxide (TiO2) and hydrated hydrogen chloride. It is sometimes referred to as "tickle" or "tickle 4" due to the phonetic resemblance of its molecular formula (TiCl4) to the word.

Titanium tetrafluoride

Titanium(IV) fluoride is the inorganic compound with the formula TiF4. It is a white hygroscopic solid. In contrast to the other tetrahalides of titanium, it adopts a polymeric structure. In common with the other tetrahalides, TiF4 is a strong Lewis acid.

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.