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Classification and use of silicon carbide

Silicon carbide is divided into two commonly used basic varieties, black silicon carbide and green silicon carbide, both of which belong to α-SiC.

① Black silicon carbide contains about 95% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.

②Green silicon carbide contains more than 97% SiC and has good self-sharpening properties. It is mostly used for processing hard alloys, titanium alloys and optical glass, and is also used for honing cylinder liners and fine grinding high-speed steel tools.


  Today, I will give you a detailed introduction to the 5 main uses of silicon carbide. Silicon carbide is widely used in the current industrial manufacturing. There are relatively few natural silicon carbides. Now the industry uses artificially synthesized silicon carbide.

    1. The application of non-ferrous metal smelting industry uses silicon carbide with high temperature resistance, high strength, good thermal conductivity, impact resistance, and can be used as high temperature indirect heating material, such as hard pot distillation furnace, rectification furnace tray, aluminum electrolytic cell, copper melting furnace Lining, arc plate for zinc powder furnace, thermocouple protection tube, etc.

    2. The application in the iron and steel industry utilizes the characteristics of corrosion resistance, thermal shock resistance, wear resistance and good heat conduction of silicon carbide. It is used in the lining of large blast furnaces to improve the service life.

    3. The application of metallurgical mineral processing industry The hardness of silicon carbide is second only to diamond, and it has strong wear resistance. It is an ideal material for wear-resistant pipes, impellers, pump chambers, cyclones, and mine bucket linings. Its wear resistance is The service life of cast iron and rubber is 5-20 times, and it is also one of the ideal materials for aviation runways.

    4. The application of building materials, ceramics, and grinding wheel industry makes use of its thermal conductivity, heat radiation, and high heat intensity to manufacture thin-plate kiln furniture, which can not only reduce the capacity of kiln furniture, but also improve the kiln’s loading capacity and product quality. It is an ideal indirect material for ceramic glaze baking and sintering.

    5. The application of energy saving uses good heat conduction and thermal stability as a heat exchanger, which reduces fuel consumption by 20%, saves fuel by 35%, and increases productivity by 20-30%, especially in the discharge pipelines used in mine dressing plants. Its wear resistance is 6-7 times that of ordinary wear-resistant materials.

 6. Silicon carbide is also one of the ideal materials for solar water heaters on highways and aviation runways.

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