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Osbornite

Titanium nitride
Brown powdered titanium nitride
The structure of sodium chloride; titanium nitride's structure is similar.
Names
IUPAC name
Titanium nitride
Identifiers
3D model (JSmol)
ECHA InfoCard 100.042.819
EC Number 247-117-5
PubChem CID
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
+38×106 emu/mol
Thermal conductivity 19.2 W/(m·°C)
Structure
Cubic, cF8
Fm3m, No. 225
Octahedral
Related compounds
Related coating
Titanium aluminum nitride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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 9.35×106 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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