Osbornite
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IUPAC name
Titanium nitride
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| Identifiers | |
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3D model (JSmol)
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| ECHA InfoCard | 100.042.819 |
| EC Number | 247-117-5 |
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PubChem CID
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| Properties | |
| TiN | |
| Molar mass | 61.874 g/mol |
| Appearance | Coating of golden color |
| Odor | Odorless |
| Density | 5.22 g/cm3 |
| Melting point | 2,930 °C (5,310 °F; 3,200 K) |
| insoluble | |
| +38×10−6 emu/mol | |
| Thermal conductivity | 19.2 W/(m·°C) |
| Structure | |
| Cubic, cF8 | |
| Fm3m, No. 225 | |
| Octahedral | |
| Related compounds | |
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Related coating
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Titanium aluminum nitride |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
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 gold 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.
TiN has a Vickers hardness of 2400, a modulus of elasticity of 251 GPa, a thermal expansion coefficient of 9.35×10−6 K−1, and a superconducting transition temperature of 5.6 K.
TiN will oxidize at 800 °C in a normal atmosphere. It is chemically stable at 20 °C, according to laboratory tests, but can be slowly attacked by concentrated acid solutions with rising temperatures.
TiN has infrared (IR) reflectivity properties, reflecting in a spectrum similar to elemental gold (Au), which gives it a yellowish color. Depending on the substrate material and surface finish, TiN will have a coefficient of friction ranging from 0.4 to 0.9 against another TiN surface (non-lubricated). The typical TiN formation has a crystal structure of NaCl-type with a roughly 1:1 stoichiometry; TiNx compounds with x ranging from 0.6 to 1.2 are, however, thermodynamically stable. A thin film of TiN was chilled to near absolute zero, converting it into the first known superinsulator, with resistance suddenly increasing by a factor of 100,000.
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