Silicon carbide is an inorganic substance with the chemical formula SiC. It is produced by high-temperature smelting of raw materials such as quartz sand, petroleum coke (or coal coke), and sawdust (salt needs to be added when producing green silicon carbide) through a resistance furnace. Silicon carbide is a semiconductor that exists in the form of the extremely rare mineral moissanite in nature. Since 1893, it has been produced on a large scale as powders and crystals, used as abrasives, etc. Among non oxide high-tech refractory materials such as C, N, and B, silicon carbide is the most widely used and economical one, which can be called steel sand or refractory sand.