Silicon Carbide Hardness Is Very Large

Silicon carbide due to stable chemical properties.

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Silicon carbide due to stable chemical properties, high thermal conductivity, small thermal expansion coefficient, good wear resistance, in addition to abrasive, there are many other uses, such as: with a special process to the silicon carbide powder coated on the inner wall of the turbine impeller or cylinder body, can improve its wear resistance and extend the service life 1 ~ 2 times; Used to make high-grade refractory material, heat resistance, small size, light weight and high strength, good energy saving effect. Low-grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer, which can speed up steelmaking, facilitate control of chemical composition, and improve the quality of steel. In addition, silicon carbide is also widely used in the production of electric heating element silicon carbon rod.

Silicon carbide hardness is very large, Mohs hardness of 9.5, second only to the world's hardest diamond (10), has excellent thermal conductivity, is a semiconductor, high temperature can resist oxidation.

There are at least 70 crystalline forms of silicon carbide. α-silicon carbide is the most common kind of isomorphic heterocrystalline, formed at higher temperatures than 2000 °C, with hexagonal crystalline structure (like zinc). β-silicon carbide, cubic crystalline structure, similar to diamond, is generated below 2000 °C, the structure is shown in the diagram attached to the page. Although in the application of heterogeneous catalyst supports, because it has a higher unit surface area than the α type is notable, and another silicon carbide, μ-silicon carbide is the most stable and has a more pleasant sound when colliding, but until today, these two types have not been used commercially.