What are the material properties of silicon carbide

Because of its 3.2g/cm3 specific gravity and high sublimation temperature (approximately 2700 °C), silicon carbide is very suitable as a raw material for bearings or high-temperature furnaces. It will not melt under any pressure that can be reached, and has a relatively low chemical activity. 

Due to its high thermal conductivity, high breakdown electric field strength and high maximum current density, many people try to use it to replace silicon in the application of semiconductor high-power components. In addition, it has a strong coupling effect with microwave radiation, and all its high sublimation points make it practical for heating metals.

Pure silicon carbide is colorless, while the industrially produced brown to black is due to impurities containing iron. The rainbow-like luster on the crystal is due to the silica protective layer on the surface