Binding between tungsten and carbon forms an extremely dense crystal structure called hexagonal crystal, whose Young’s modulus is approximately 550 GPa, which is a rigidity nearly two times that of steel.
The Mohs’ hardness of tungsten carbide is “9.” It boasts a level of hardness second to diamond.
It is an optimal raw material for cutting tools to be used in a high-temperature and high-speed environment, thanks to the high strength at high temperatures and low thermal expansion coefficient.
Tungsten carbide is an extremely stable substance, and it does not oxidize at normal temperatures or in air. In addition, it has a low tendency to form a solid solution with various elements, and delivers stable characteristics even in severe environments.
Oxidation occurs at approximately 300℃ and reaction occurs rapidly at approximately 700℃ to form an oxide (WO3) when its powder is heated in an oxygen-containing atmosphere.
Although it does not dissolve in water, hydrochloric acid or sulfuric acid, it dissolves in nitic acid.
Reacts with chlorine at 400℃ or higher.
Reacts with fluorine at 18℃.
|Crystal structure||Hexagonal crystal|
|Amount of carbon combined(%)||6.13|