Silicon carbide has black silicon carbide and green silicon carbide two commonly used basic varieties, all belong to α-SiC. ① Black silicon carbide containing SiC about 98.5%, its toughness is higher than green silicon carbide, mostly used for processing low tensile strength materials, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals. Green silicon carbide SiC99% more, good self-sharpening, mostly used for processing hard alloy, titanium alloy and optical glass, also used for honing cylinder liner and fine grinding high-speed steel tools. In addition, there are cubic silicon carbide, it is made of yellow green crystal process, used to make abrasive for bearing super finishing, can make the surface roughness from Ra32 ~ 0.16 micron processing to Ra0.04 ~ 0.02 micron.
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: the process of silicon carbide powder coated in the turbine impeller or cylinder inner wall, can be improved; Used to make advanced refractory materials, shock resistance, small size, light weight and high strength, good energy saving effect. Low grade silicon carbide (containing SiC about 85%) is an excellent deoxidizer, with it can speed up the speed of steel, and easy to control the chemical composition, 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 has great hardness and excellent thermal conductivity. It is a kind of semiconductor.
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