As a Sandpaper Suppliers, share with you. Due to its stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and good wear resistance, silicon carbide has many other uses besides being used as abrasives. For example, silicon carbide powder is applied to the impeller or cylinder of a water turbine by a special process. The inner wall can increase its wear resistance and prolong its service life by 1 to 2 times; the high-grade refractory material made of it has heat shock resistance, small size, light weight, high strength, and good energy-saving effect. Low-grade silicon carbide (containing about 85% of SiC) is an excellent deoxidizer. It can speed up the steelmaking speed, and facilitate the control of chemical composition and improve the quality of steel. In addition, silicon carbide is also widely used to make silicon carbide rods for electric heating elements.
Silicon carbide has a very high hardness, with a Mohs hardness of 9.5, second only to the world's hardest diamond. It has excellent thermal conductivity, is a semiconductor, and can resist oxidation at high temperatures.
There are at least 70 crystalline forms of silicon carbide. α-Silicon carbide is the most common kind of isomorphous crystal, which is formed at a high temperature higher than 2000 °C and has a hexagonal crystal structure (wurtzite-like). β-Silicon Carbide, cubic crystal structure, similar to diamond, it is formed below 2000 °C, the structure is shown in the figure on the page. Although in the application of heterogeneous catalyst support, it is eye-catching because of its higher unit surface area than the α type, while another type of 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 yet been commercially applied.
Because of its 3.2g/cm3 specific gravity and high sublimation temperature (approximately 2700 °C), silicon carbide is very suitable as a raw material for bearings or high-temperature furnaces. It will not melt under any pressure that can be reached, and has a relatively low chemical activity. Due to its high thermal conductivity, high breakdown electric field strength and high maximum current density, many people try to use it to replace silicon in the application of semiconductor high-power components. In addition, it has a strong coupling effect with microwave radiation, and all its high sublimation points make it practical for heating metals.
Pure silicon carbide is colorless, while the industrially produced brown to black is due to impurities containing iron. The rainbow-like luster on the crystal is due to the silicon dioxide protective layer on the surface.
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