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Silicon Carbide Is a Very Important Abrasive Material

Carbonized silicon can be used as wear-resistant components, heat exchangers, large-scale integrated circuit substrates as thermal materials, and materials for turbine active wheels, bearings, and blades under high temperature conditions. Silicon carbide has high hardness, good wear resistance, good grinding performance, and has anti-thermal shock, anti-oxidation and other properties, which makes it a very important grinding material. Silicon carbide ceramics have advantages such as high temperature resistance, thermal shock resistance, corrosion resistance, abrasion resistance, light weight, and good thermal conductivity.

Advantages of black silicon carbide abrasive performance

Black silicon carbide, with metallic luster, contains more than 95% SiC, and has greater strength than green silicon carbide, but lower hardness, mainly used for grinding cast iron and non-metallic materials.

Its molecular formula is SiC, and its hardness is between alumina and diamond. Its mechanical strength is higher than that of alumina and can be used as an abrasive and other industrial materials. Industrial silicon carbide was successfully developed in 1891 and is one of the earliest synthetic abrasives. Although there is a small amount of silicon carbide in meteorites and the earth's crust, there is still no available mining source.

Black silicon carbide powder contains about 98.5% 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, etc.

Due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance, silicon carbide has many other uses besides being used as an abrasive. For example, special processes can be used to coat silicon carbide powder on the inner wall of a water turbine impeller or cylinder body to improve its wear resistance and extend its service life by 1-2 times.

The refractory material made from it has high heat shock resistance, small volume, light weight, and high strength, and has a good energy-saving effect. Low-grade silicon carbide (containing about 85% SiC) is a good deoxidizer. Using it can accelerate the steelmaking process and facilitate the control of chemical composition to improve the quality of steel. In addition, silicon carbide powder is also widely used in the production of electric heating element silicon carbide rods.

Precautions for using silicon carbide abrasives

  • The feeding environment should be as sealed as possible, so that it is not easy to fall into large particles with the airflow.

  • Try to avoid using damaged packaging of silicon carbide powder such as green silicon carbide grit, which may have mixed impurities after being damaged, affecting the cutting effect.

  • The use of slurry should control the use of tools to prevent cross-contamination.

  • Avoid storing the prepared slurry for too long, as this may produce agglomerates and false particles, which may affect wire cutting.

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Xiliubei Village, Daiye Town, Dengfeng City, Zhengzhou City, Henan Province, China
Unit D, 16/F, One Capital Place, 18 Luard Road, Wan Chai, Hong Kong. +852-2815 0191 (HK)