Varieties of silicon carbide substances

Silicon carbide has two commonly used basic varieties: black silicon carbide and green silicon carbide, both of which belong to the α- SiC。① Black silicon carbide contains about 95% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron, and non-ferrous metals Green silicon carbide contains more than 97% SiC and has good self sharpening property. It is mostly used for machining cemented carbide, titanium alloy and optical glass, as well as honing cylinder liners and finishing high-speed steel cutters. In addition, there is cubic silicon carbide, which is a chartreuse crystal made by a special process. The abrasive tool used to make it is suitable for the ultra precision machining of bearings, which can make the surface roughness from Ra32~0.16 μ m to Ra0.04~0.02 μ m in a single processing.