The Properties And Application of Titanium nitride
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Update time : 2020-11-06 09:11:46
Titanium nitride (TiN) has a typical NaCl-type structure, which belongs to a face-centered cubic lattice with a lattice constant a=0.4241 nm, in which titanium atoms are located at the corner tops of the face-centered cubic. TiN is a non-stoichiometric compound, and its stable composition range is TiN0.37-TiN1.16. The nitrogen content can be changed within a certain range without causing changes in the structure of TiN. TiN powder is usually yellowish brown, ultrafine TiN powder is black, and TiN crystals are golden yellow. TiN has a melting point of 2950°C, a density of 5.43-5.44g/cm3, a Mohs hardness of 8-9, and good thermal shock resistance. TiN has a higher melting point than most transition metal nitrides, but a lower density than most transition metal nitrides, so it is a very heat-resistant material. The crystal structure of TiN is similar to TiC, except that the C atoms in TiN are replaced by N atoms.
Nature introduction:
TiN is a very stable compound that will not react with metals such as iron, chromium, calcium and magnesium at high temperatures, and TiN crucibles will not react with acidic slag under CO and N2 atmospheres. It is used with alkaline slag, so TiN crucible is an excellent container for studying the interaction between molten steel and certain elements. When heated in a vacuum, TiN loses nitrogen, resulting in low nitrogen content titanium nitride.
TiN has an attractive golden color, high melting point, high hardness, good chemical stability and low wettability to metals. It has high electrical conductivity and superconductivity and can be applied to high-temperature structural materials. And superconducting materials.
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