Low Price Silicon Carbide | Modern Silicon Carbide

α- SiC forms many different variants due to the different stacking sequences of carbon and silicon atoms in its crystal structure, and more than 70 varieties have been found. β- SiC transforms to α- SiC。 The industrial production of silicon carbide is made by refining high-quality quartz sand and petroleum coke in an electric resistance furnace. The refined silicon carbide blocks are processed into products of various particle sizes through crushing, acid and alkali washing, magnetic separation, screening or water separation.

Silicon carbide has two basic varieties: black silicon carbide and green silicon carbide 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 to process materials with low tensile strength, such as glass, ceramics, stone, refractories, cast iron and non-ferrous metals. ② 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 for honing cylinder liners and finishing high-speed steel cutters. In addition, there is cubic silicon carbide, which is a yellow green crystal made by a special process. The abrasive tools used to make it are suitable for ultra precision machining of bearings, and can make the surface roughness from Ra32~0.16 μ m to Ra0.04~0.02 μ m.

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

Pure silicon carbide is colorless and transparent crystal. Industrial silicon carbide is light yellow, green, blue or even black due to different types and contents of impurities, and its transparency varies with its purity. SiC crystal structure is divided into hexagonal or rhombohedral α- SiC and cubic β- SiC。