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Silicon carbide, is a kind of inorganic substance, chemical formula is SiC, is the quartz sand, petroleum coke (or coal coke), wood chips (the production of green silicon carbide need to add salt) and other raw materials through the resistance furnace high temperature smelting. Silicon carbide is a semiconductor that occurs in nature in the form of the extremely rare mineral moissanite. Since 1893 it has been mass-produced as powders and crystals, used as abrasives, etc. In C, N, B and other non-oxide high-tech refractory raw materials, silicon carbide is the most widely used, the most economical one, can be called gold steel sand or refractory sand. China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide two, are hexagonal crystals.