Introduction of silicon carbide
Silicon carbide (SiC) is using quartz sand and petroleum coke or coal tar, wood chips as raw material through high temperature electric resistance furnace smelting. There is also a rare mineral silicon carbide in nature, and the mo SangShi. Silicon carbide is also called the moissanite. In contemporary C, N, B the oxide refractory raw materials in the high technology, such as silicon carbide as the most widely used, one of the most economic.
Silicon carbide abrasive high packing density, strong grinding ability, high hardness, strong cutting ability, particle size distribution and uniform; With high temperature resistance, strength, good thermal performance, impact resistant, high temperature indirectly heated material. Microscopic shape a six-party crystal, silicon carbide mohs hardness of 9. 5, the Williams microscopic hardness is 3000-3300 kg/mm 2, knoop hardness is 2670-2815 kg/mm, microhardness, 3300 kg per cubic millimeter. Higher than in the abrasive corundum, second only to diamond and cubic boron nitride and boron carbide. Density is thought to be 3. 20 g/mm 3, its natural bulk density in 1 of silicon carbide abrasive. 2-1. 6 g/mm between 3, specific gravity is 3. 20 ~ 3. 25. Silicon carbide abrasive is widely used in various industries, jade stones polishing, glass, steel, plastic, electronics, solar cutting, die casting, refractory,. Aerospace defense, construction road. (denim sandblasting), clothing industry, beauty tools, metal grinding, also suitable for ceramic block abrasive grinding wheel manufacturing.
Classification of silicon carbide
Silicon carbide products can be according to the content of SIC, the amount of binder type and classification, material performance depends largely on the combination of material between SIC particles in condition, therefore, in accordance with the binder type, silicon carbide products are divided into the following kinds:
1, oxidation combined with silicon carbide: Al2O3 - SiO2 silicate series of combining phase, including clay, as well as the combination of mullite and SiO2 combined with SiC.
2, nitride combined with SiC: combining phase Si3N4 \\ Si2N2O covalent compounds, etc.
3, the combination of SiC: including beta SiC combination of SiC and recrystallization SiC.
4, siliconizing reaction sintering SiC: composed of SiC and free silicon a SiC quality engineering ceramics material.
Silicon carbide products with higher grade and higher price, choose appropriate oneself grade silicon carbide products, is one of the most economical. According to different steel grade, different requirements for silicon carbide products, medium and high carbon steel, should choose high quality silicon carbide products, on the contrary, carbon-steel dosage is not big demand of silicon carbide, can choose low grade silicon carbide to alloying, as a result, is one of the most economical.
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