Silicon carbide is an inorganic substance with the chemical formula SiC. It 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). Silicon carbide is a semiconductor that occurs in nature as the extremely rare mineral moissanite. It has been produced on a large scale since 1893 as powder and crystals for use as abrasives, etc. Among non-oxide high-tech refractory raw materials such as C, N, and B, silicon carbide is the most widely used and economical one, and can be called emery sand or refractory sand. Silicon carbide produced industrially in China is divided into two types: black silicon carbide and green silicon carbide, both of which are hexagonal crystals.
Silicon carbide has four main application areas due to its corrosion resistance, high temperature resistance, high strength, good thermal conductivity, and impact resistance, namely: functional ceramics, advanced refractory materials, abrasives, and metallurgical raw materials. Silicon carbide rough materials can be supplied in large quantities and cannot be considered high-tech products. However, the application of nano-scale silicon carbide powder with extremely high technical content is unlikely to achieve economies of scale in a short time.
1), High-purity single crystal can be used to manufacture semiconductors and silicon carbide fibers;
Main uses: used for wire cutting of 3-12 inch monocrystalline silicon, polycrystalline silicon, potassium arsenide, quartz crystal, etc. Engineering processing materials for solar photovoltaic industry, semiconductor industry, and piezoelectric crystal industry.
Used in semiconductors, lightning rods, circuit components, high temperature applications, UV detectors, structural materials, astronomy, disc brakes, clutches, diesel particulate filters, filament pyrometers, ceramic films, cutting tools, heating elements, nuclear fuel, Jewelry, steel, protective gear, catalyst carrier and other fields.
2), as an abrasive, it can be used to make abrasive tools, such as grinding wheels, oil stones, grinding heads, sand tiles, etc.
Mainly used for grinding and polishing grinding wheels, sandpaper, abrasive belts, whetstones, grinding blocks, grinding heads, grinding pastes, and monocrystalline silicon, polycrystalline silicon in photovoltaic products, and piezoelectric crystals in the electronics industry.
3), as metallurgical deoxidizer and high temperature resistant material;
It can be used as a deoxidizer for steelmaking and a modifier for the structure of cast iron. It can be used as a raw material for manufacturing silicon tetrachloride and is the main raw material for the silicone resin industry. Silicon carbide deoxidizer is a new type of strong composite deoxidizer, which replaces the traditional silicon powder and carbon powder for deoxidation. Compared with the original process, the physical and chemical properties are more stable, the deoxidation effect is good, the deoxidation time is shortened, energy is saved, and the deoxidation rate is improved. It is of great value to improve the efficiency of steelmaking, improve the quality of steel, reduce the consumption of raw and auxiliary materials, reduce environmental pollution, improve working conditions, and improve the comprehensive economic benefits of electric furnaces.
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