Titanium carbide

Cubic

Ti, C

Gray to black, shiny silver connection

Fixed

4.93 g · cm -3

3140 ° C

4820 ° C

10 mg · l - 1 in water

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Titanium carbide is an inorganic chemical compound of the elements titanium and carbon.

Production and representation

Titanium carbide is formed in the physical vapor deposition ( PVD) of titanium and methane:

In the chemical vapor deposition ( CVD) as a starting material of titanium (IV ) chloride used:

Titanium carbide, by carbothermic reduction of titanium dioxide

Obtained similar to titanium nitride, or by synthesis of the elements, or by a growth method. In the former reaction, mixed crystals in the form of titanium carbon nitride TiCN or Titancarboxynitrid TiCON can arise depending on the reaction conditions in air.

Especially pure, stoichiometric composition of titanium carbide is deposited on at a fixed titanium ( IV) -chlorid/Kohlenstofftetrachlorid-Verhältnis to more than 1250 ° C heated graphite rods from.

Properties

Titanium carbide is a gray combustible powder that is practically insoluble in water. It is insoluble in hydrochloric acid and sulfuric acid, but is soluble in nitric acid. It is stable in air up to 800 ° C. With very good electrical conductivity, it has a positive temperature coefficient. Titanium carbide has a crystal structure of sodium chloride type with considerable phase width ( TiC1 0.0 - TiC0, 3). In the stoichiometric compounds the places of the non-metal atoms remain unfilled. Full occupation is strikingly enough, not quite achieved ( TiC0, 98). It is characterized by a particularly high hardness up to 4000 HV. The bending strength is 240-400 MPa, the hardness HV1 at 22-30 GPa and the modulus of elasticity at 550-570 GPa.

Use

The substance is used as a coating material for indexable inserts, milling cutters, broaches, form tools, saw blades, etc..

Another use of titanium carbide tooling in general and in the chemical industry as an integral part of the sinter material family Ferro - titanite or generally as a component of stainless and acid resistant steels and hard metals. So it is with up to 4% part of the hard metals of Group K, up to 10% in hard metals of group M and up to 43 % in group P. titanium carbide increases the heat resistance, hardness and oxidation resistance.