Silicon carbide (SiC) is smelted at high temperature in a resistance furnace using quartz sand, petroleum coke (or coal coke), and wood chips as raw materials. Silicon carbide also exists in nature as a rare mineral, moissanite. Silicon carbide is also called moissanite. Among contemporary non-oxide high-tech refractory raw materials such as C, N, and B, silicon carbide is the most widely used and economical one.
It can be called emery sand or refractory sand. Silicon carbide is smelted at high temperature in a resistance furnace using raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips (salt is required when producing green silicon carbide). At present, the silicon carbide produced industrially in my country is divided into two types: black silicon carbide and green silicon carbide. Both are hexagonal crystals with a specific gravity of 3.20 to 3.25 and a microhardness of 2840 to 3320kg/mm2.
Including black silicon carbide and green silicon carbide, among which: black silicon carbide is made of quartz sand and petroleum coke as the main raw materials, and is smelted at high temperature in a resistance furnace. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp. Green silicon carbide is made from petroleum coke as the main raw material, salt is added as an additive, and it is smelted at high temperature in a resistance furnace. Its hardness is between corundum and diamond, and its mechanical strength is higher than corundum.
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