Titanium nitride has a typical NaCl-type structure and belongs to face-centered cubic lattice with lattice constant a=0.4241 nm. TiN atoms are located at the corner top of face-centered cubic lattice.
Titanium nitride is a non-stoichiometric compound. Its stable composition range is TiN 0.37-TiN 1.16. Nitrogen content can change in a certain range without causing changes in TiN structure.
Titanium nitride powders are usually yellowish brown, ultrafine TiN powders are black, and TiN crystals are golden yellow. TiN has a melting point of 2950 C, a density of 5.43-5.44g/cm3, a Mohr hardness of 8-9 and good thermal shock resistance. The melting point of TiN is higher than that of most transition metal nitrides, but its density is lower than that of most metal nitrides. The crystal structure of Ti N is similar to that of Ti C except that C atom is replaced by N atom.
Titanium nitride is a very stable compound. Titanium nitride crucible does not react with iron, chromium, calcium and magnesium at high temperature. TiN crucible does not react with acid slag and alkaline slag in CO and N2 atmosphere. Therefore, TiN crucible is an excellent container for studying the interaction between molten steel and some elements. TiN loses nitrogen when heated in vacuum and produces TiN with low nitrogen content.
titanium nitride has attractive golden color, high melting point, high hardness, good chemical stability, low wettability with metals, and high conductivity and superconductivity. It can be used in high temperature structural materials and superconducting materials.