Black Silicon Carbide Abrasives

Black silicon carbide due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance, it has many other uses besides being used as an abrasive, such as: coating silicon carbide powder on the impeller or cylinder block of a water turbine with a special process, the inner wall can improve its wear resistance and prolong the service life by 1 to 2 times; the high-grade refractory material made of it is heat-shock resistant, small in size, light in weight and high in strength, and has good energy-saving effect.

Low-grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer, which can speed up steelmaking and facilitate the control of chemical composition to improve the quality of steel. In addition, Black silicon carbide is also widely used to make silicon carbide rods for electric heating elements.

Black silicon carbide is very hard and has excellent thermal conductivity, it is a semiconductor and can resist oxidation at high temperatures. There are many different shapes and sizes of grinding wheels and abrasives, according to different grinding materials, bond materials and manufacturing processes, each type of grinding wheel has a certain range of application. Improper selection will directly affect machining accuracy, surface roughness and production efficiency. Therefore, the appropriate grinding wheel must be selected according to the specific situation when grinding.

How to choose the grinding wheel correctly? Summarize the grinding wheels commonly used in grinding, so that everyone can clearly choose the grinding wheel. Ordinary grinding wheel selection:

The choice of abrasive mainly depends on the workpiece material and heat treatment method:
When grinding materials with high tensile strength, choose abrasives with high toughness.
When grinding materials with low hardness and high elongation, brittle abrasives should be used.
When grinding high-hardness materials, choose abrasives with higher hardness.
Choose abrasives that are not easy to process for chemical reactions.

The most commonly used abrasives are brown corundum and white corundum, followed by black silicon carbide and green silicon carbide, and the rest are chrome corundum, single crystal corundum, microcrystalline corundum and zirconium corundum.

Brown fused alumina grinding wheel has high hardness and toughness, suitable for grinding metals with high tensile strength, such as carbon steel, alloy steel, malleable cast iron, hard bronze, etc, this abrasive has good grinding performance and wide adaptability, it is often used to remove large amounts of kibble, it is cheap and widely available.

White fused alumina grinding wheel hardness is slightly higher than that of brown aluminum oxide, and its toughness is lower than that of brown alumina. During the grinding process, the abrasive grains are easily broken, therefore, the grinding heat is small, and it is suitable for manufacturing grinding wheels for grinding hardened steel, high carbon steel, high-speed steel and grinding thin-walled parts, and the cost is higher than that of brown one.

Black silicon carbide grinding wheel is brittle and sharp, and its hardness is higher than that of white aulina, suitable for grinding materials with low mechanical strength, such as cast iron, brass, aluminum and refractory materials.

Green silicon carbide grinding wheel has higher hardness and brittleness than black silicon carbide, with sharp abrasive grains and good thermal conductivity, it is suitable for grinding hard and brittle materials such as cemented carbide, optical glass, and ceramics.

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