Black silicon carbide is a type of silicon carbide, primarily made from petroleum coke and high-quality silica. It is commonly used as an abrasive and in some non-metallic materials.
Characteristics of black silicon carbide:
Due to its stable chemical properties, high thermal conductivity, low coefficient of thermal expansion, and good wear resistance, black silicon carbide has many applications besides being used as an abrasive.
For example, coating the inner wall of turbine impellers or cylinder blocks with silicon carbide powder using a special process can improve their wear resistance and extend their service life by 1 to 2 times; refractory materials made from it are thermally shock resistant, small in size, lightweight, high in strength, and have good energy-saving effects.
Low-grade silicon carbide (containing approximately 85% SiC) is an excellent deoxidizer. It can accelerate steelmaking and facilitate control of chemical composition, improving steel quality. Furthermore, silicon carbide is widely used in the manufacture of silicon carbide heating elements.
Black silicon carbide has a very high hardness, with a Mohs hardness of 9.5, second only to diamond (10). It has excellent thermal conductivity, is a semiconductor, and is resistant to oxidation at high temperatures.
Self-sharpening properties of black silicon carbide
1. Black silicon carbide is an abrasive containing over 99% silicon carbide. Its hardness is between corundum and diamond, and its mechanical strength is higher than corundum, so it is mainly used for grinding cemented carbide tools.
2. Black silicon carbide has good self-sharpening properties and is mostly used for machining cemented carbide, titanium alloys, and optical glass. It is also used for honing cylinder liners and precision grinding high-speed steel tools. Black silicon carbide grinding wheels, designated GC wheels, are suitable for machining cemented carbide, glass, ceramics, and non-metallic materials, as well as semiconductor materials, high-temperature silicon carbide heating elements, and far-infrared source substrates.
Because of its excellent self-sharpening properties, black silicon carbide is widely used in machining applications. It also has good insulation, heat resistance, wear resistance, and very stable chemical properties.
