Material properties of silicon carbide

There are at least 70 crystalline forms of silicon carbide. α-Silicon carbide is the most common kind of isomorphous crystal, which is formed at a high temperature higher than 2000 °C and has a hexagonal crystal structure (wurtzite-like). β-Silicon Carbide, cubic crystal structure, similar to diamond, it is formed below 2000 °C, the structure is shown in the figure on the page. 

Although in the application of heterogeneous catalyst support, it is eye-catching because of its higher unit surface area than the α type, while another type of silicon carbide, μ-silicon carbide is the most stable and has a more pleasant sound when colliding. But until today, these two types have not yet been commercially applied.

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.