Characteristics Of Silicon Carbide Varieties
Since 1893, it has been mass-produced into powders and crystals, used as abrasives, etc. Among non oxide high-tech refractory raw materials such as C, N, and B, silicon carbide is the most widely used and economical one, which can be called gold steel sand or refractory sand. The silicon carbide produced by Chinese industry is divided into two types: black silicon carbide and green silicon carbide, both of which are hexagonal crystals.
Material variety
Silicon carbide has two commonly used varieties, black silicon carbide and green silicon carbide, both of which belong to α - SiC 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 over 97% SiC and has good self sharpening properties. It is mostly used for processing hard alloys, titanium alloys, and optical glass, as well as for honing cylinder sleeves and precision grinding high-speed steel cutting tools. In addition, there is cubic silicon carbide, which is a yellow green crystal produced by a special process. The grinding tools used for manufacturing are suitable for ultra precision machining of bearings, and can process the surface roughness from Ra32 to 0.16 microns to Ra0.04 to 0.02 microns in one go
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 an abrasive. For example, by applying silicon carbide powder to the inner wall of a water turbine impeller or cylinder body through a special process, its wear resistance can be improved and its service life can be extended by 1-2 times; The advanced refractory material used for production is heat-resistant, shock resistant, small in size, lightweight, and high in strength, with good energy-saving effects. Low grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer that can accelerate steelmaking speed, facilitate chemical composition control, and improve steel quality. In addition, silicon carbide is also widely used in the production of silicon carbide rods for electric heating components.
Material characteristics
Silicon carbide has a high hardness, with a Mohs hardness of 9.5, second only to the world's hardest diamond (grade 10). It has excellent thermal conductivity and is a semiconductor that can resist oxidation at high temperatures.
Silicon carbide has at least 70 crystalline forms. Alpha silicon carbide is the most common type of homogeneous heterojunction, formed at high temperatures above 2000 ° C, with a hexagonal crystalline structure (similar to fibrous zinc ore). β - silicon carbide, with a cubic crystal structure similar to diamonds [13], is formed below 2000 ° C. In the application of heterogeneous catalyst carriers, β - silicon carbide has attracted much attention due to its higher specific surface area than α - silicon carbide. There is another type of silicon carbide, μ - silicon carbide, which is the most stable and can produce a pleasant sound during collisions. However, so far, these two types of silicon carbide have not been commercially applied
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