SiC exists in nature as the extremely rare mineral called moissanite, while most of this material is synthesized in factories. As SiC is extremely hard, It has been mass produced as abrasive since late 19th century. Silicon carbide powder has a black color when the purity is low and products with purity higher than 90% is green. SiC grains can be bonded together by sintering to form ceramic materials that could be used as car brakes or bullet proof material for ballistic vests. Like most of other ceramic materials, working temperature of SiC parts can be 2000 C or even higher. Silicon carbide tubes served as components in industrial furnaces and thermal couple protectors, and components made by silicon carbide are replacing metal parts in some turbo engines.
While low purity, cheap silicon carbide powder is widely used in as abrasive and cutting tool components, products with high purity could be applied in areas such as semiconductor industries.
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