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. Can be called corundum sand or refractory. Silicon carbide industrial manufacturing method is to use high quality quartz sand and petroleum coke in the resistance furnace refining. Refined silicon carbide piece, after crushing, acid and alkali washing or magnetic separation and screen or water concentration and made into products of various kinds of particle size. Silicon carbide hardness is very big, mohs hardness of 9.5, second only to the world's most hard diamond (10), good thermal conductivity, is a kind of semiconductor, can oxidation resistance at high temperature. About 85% low grade silicon carbide (SiC) is an excellent deoxidizer, use it can speed up steel making, and facilitate the control of chemical composition, improve the quality of steel. In addition, silicon carbide also used to produce large amounts of electric heating element silicon carbon rod.
Green silicon carbide black silicon carbide and silicon carbide two commonly used the base of the varieties, are alpha SiC.
Black silicon carbide containing SiC by about 95%, the toughness is higher than the green silicon carbide, mostly used for processing low tensile strength of material, such as glass, ceramics, stone, refractory material, cast iron and nonferrous metal, etc.
Green silicon carbide containing SiC is about more than 97%, good self-sharpening, mostly used for processing hard alloy, titanium alloy and optical glass, also used for honing cylinder jacket and fine grinding HSS cutting tools. Green silicon carbide is a petroleum coke and the high quality silica as the main raw material, adding salt as additive, in the Canon of high-temperature resistance furnace smelting. Green crystal, crisp and sharp and has a certain thermal conductivity and electrical conductivity. Higher than in the abrasive corundum, second only to diamond and cubic boron nitride and boron carbide. Green silicon carbide powder can be used in crystal cutting and precision grinding, precision grinding of hard glass, monocrystalline silicon and polycrystalline silicon slice, the precision grinding of monocrystalline silicon rods, hard metal processing, such as copper and copper alloy soft metal processing, a variety of resin material processing, etc.
Silicon carbide mainly has four major application fields, i.e., functional ceramics, refractories, abrasives, metallurgical raw materials.
Abrasives: silicon carbide is mainly used for grinding wheel, abrasive paper, abrasive belt, abrasive, grinding, grinding head, grinding paste and monocrystalline silicon, polycrystalline silicon photovoltaic products and electronic industry of piezoelectric crystal aspects such as grinding, polishing, etc.
Chemical industry: silicon carbide can be used as tissue conditioner, steelmaking deoxidizer and cast iron can be used as manufacture of silicon tetrachloride raw material, is the main raw material of silicone industry. Silicon carbide deoxidizer is a new kind of compound deoxidizer, replaced the traditional solid silicon powder carbon powder, and compared with the original process of various physical and chemical performance is more stable, deoxidization effect is good, deoxidize shorter time, save energy and improve the efficiency of steel, improve the quality of steel, reduce raw material consumption, reduce environmental pollution, improve working conditions, improve the comprehensive economic benefits of the electric furnace has important value.
Wear-resisting, refractory and corrosion resistant material: using silicon carbide has corrosion resistance, high temperature resistance, strength, good thermal conductivity and impact resistance and other properties, silicon carbide on the one hand, can be used for all kinds of smelting furnace lining, high temperature furnaces artifacts, silicon carbide plate, plate, supports, sagger, silicon carbide crucible, etc. On the other hand, the high temperature of silicon carbide can be used in non-ferrous metal smelting industry indirect heating material, such as vertical distillation furnace, furnace distillation tray, aluminium electrolyzer, copper melting furnace lining, furnace zinc powder with arc plate, the thermocouple protection tube, etc. Silicon carbide used to produce wear-resisting, corrosion resistant, high temperature resistance and other advanced silicon carbide ceramic materials. Silicon carbide can also make the rocket nozzle, gas turbine blades, etc. In addition, silicon carbide and highway, aviation airport runway solar water heater, etc. One of the ideal material.
Non-ferrous metals: using silicon carbide has high temperature resistance, strength, good thermal performance, impact resistance, high-temperature indirect heating, such as strong retort furnace, tray distillation furnace, aluminium electrolyzer, copper melting furnace lining, furnace zinc powder with arc plate, the thermocouple protection tube, etc.
Steel aspects: using silicon carbide corrosion resistance, thermal shock resistance to abrasion, good characteristics of thermal conductivity, improves the service life for large blast furnace lining.
Metallurgical beneficiation: silicon carbide hardness is second only to diamond, strong wear resistance, silicon carbide is wear-resisting pipe, the impeller, pump room, cyclone, ore bucket lined with ideal material, silicon carbide wear-resisting performance is cast iron, 5 -- 20 times the service life of rubber, silicon carbide is one of the aviation flight track ideal material.
Building materials: ceramic grinding wheel industry using silicon carbide coefficient of thermal conductivity, thermal radiation, the characteristics of high strength, manufacturing sheet kiln furniture, not only can reduce the capacity of kiln furniture, also improves the loading capacity of the kiln and the product quality, shorten the production cycle, silicon carbide ceramic glaze is baking sintering indirect materials ideal.
