Black quartz sand, also known as bright black sand, carborundum and silicon carbide (SiC) are made of quartz sand, petroleum coke (or coal coke), wood chips (salt is needed to produce green silicon carbide) and other raw materials through the resistance furnace high temperature smelting. Silicon carbide also exists in nature as a rare mineral, moissanite. Silicon carbide is also known as carbonite. In the contemporary C, N, B and other non-oxide high-tech refractory raw materials, silicon carbide is a kind of application and economy, which can be called gold steel sand or refractory sand. At present, China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide two kinds, are hexagonal crystals, the specific gravity of 3.20 ~ 3.25, microhardness of 2840 ~ 3320kg/mm
2. Scope of application
Silicon carbide has four main application areas, namely: functional ceramics, refractories, abrasives and metallurgical raw materials. Silicon carbide raw material has been able to supply a large number of high-tech products, and the application of nano-scale silicon carbide powder with very high technical content is impossible to form economies of scale in a short time.
(1) As an abrasive, it can be used as an abrasive tool, such as grinding wheel, whetstone, grinding head, sand tile, etc.
(2) As a metallurgical deoxidizer and high temperature resistant material.
(3) High-purity single crystals can be used to manufacture semiconductors and silicon carbide fibers.
Main Applications: For 3-12 inch monocrystalline silicon, polysilicon, potassium arsenide, quartz crystal and other wire cutting. Solar photovoltaic industry, semiconductor industry, piezoelectric crystal industry engineering processing materials.
Used in semiconductor, lightning rod, circuit components, high temperature applications, UV detector, structural materials, astronomy, disc brake, clutch, di particulate filter, fine wire pyrometer, ceramic film, cutting tools, heating elements, nuclear fuel, jewelry, steel, protective gear, catalyst support and other fields.
Abrasive tools It is mainly used for grinding wheel, sandpaper, sand belt, whetstone, grinding block, grinding head, grinding paste and photovoltaic products in monocrystalline silicon, polysilicon and piezoelectric crystals in the electronics industry.
Chemical engineering It can be used as a deoxidizer for steelmaking and an improver for cast iron structure, and can be used as a raw material for the manufacture, which is the main raw material for the silicone resin industry. Silicon carbide deoxidizer is a new type of strong composite deoxidizer, replacing the traditional silicon powder carbon powder for deoxidation, compared with the original process, the physical and chemical properties are more stable, the deoxidation effect is good, shorten the deoxidation time, save energy, improve the efficiency of steelmaking, improve the quality of steel, reduce raw and auxiliary materials consumption, reduce environmental pollution, improve working conditions, It is of great value to improve the comprehensive economic benefit of electric furnace.
"Three resistant" material
The use of silicon carbide has corrosion resistance, high temperature resistance, high strength, good thermal conductivity, impact resistance and other characteristics, silicon carbide on the one hand can be used in a variety of smelting furnace lining, high-temperature furnace components, silicon carbide plate, lining plate, support parts, saggar, silicon carbide crucible and so on.
On the other hand, it can be used for high temperature indirect heating materials in non-ferrous metal smelting industry, such as vertical retort furnace, rectification furnace tray, aluminum electrolytic cell, copper melting furnace lining, arc plate for owder furnace, thermocouple protection tube, etc. Used for the production of wear-resistant, corrosion-resistant, high-temperature silicon carbide ceramic materials; It can also be made into rocket nozzles, gas turbine blades, etc. In addition, silicon carbide is also one of the ideal materials for highway, aviation runway solar water heaters.
Non-ferrous metal
The use of silicon carbide has high temperature resistance, high strength, good thermal conductivity, impact resistance, as high temperature indirect heating materials, such as distillation furnace, rectification furnace tray, aluminum electrolytic cell, copper melting furnace lining, zink powder furnace arc plate, thermocouple protection tube.
steel
The use of silicon carbide corrosion resistance, thermal shock resistance wear resistance, good thermal conductivity characteristics, used in large blast furnace lining to improve the service life. Metallurgical dressing Silicon carbide hardness is second only to diamond, with strong wear resistance, is the ideal material for wear resistant pipes, impellers, pump chambers, cyclones, ore bucket lining, its wear resistance is cast iron. 5-20 times the service life of rubber &def is also one of the ideal materials for aviation runways. Building materials ceramic grinding wheel industry The use of its thermal conductivity, thermal radiation, high thermal strength and large characteristics, the manufacture of sheet kiln, not only can reduce the capacity of kiln, but also improve the furnace loading capacity and product quality, shorten the production cycle, is the ideal indirect material for baking and sintering ceramic glaze. Energy conservation The use of good thermal conductivity and thermal stability, as a heat exchanger, the fuel consumption is reduced by 20%, the fuel saving is 35%, and the productivity is increased by 20-30%, especially the internal discharge pipeline used in the mine processing plant, and the wear resistance is 6-7 times that of ordinary wear-resistant materials. Abrasive size and its composition according to GB/ T2477-83. Abrasive particle size composition determination method according to GB/ T2481-83. Jewel Synthetic silicon carbide (Synthetic Moissanite), also known as synthetic moissanite, synthetic carbonite (chemical composition SiC), dispersion 0.104 than diamond (0.044), refractive index 2.65-2.69 (diamond 2.42), with the same diamond luster, "fire color" strong, Closer to diamonds than any previous imitation. This is manufactured by C3 company in North Carolina, the United States, has the world's production of synthetic silicon carbide patents, is being promoted to the world.
Sand blasting: The product is made of brown corundum micro-powder by high strength pressure extrusion, high temperature sintering molding, moderate hardness, clean, not easy to break. Repeated use, good sandblasting effect. 1, steel, steel pipe, steel structure stainless steel products surface matte treatment, sand blasting before spraying treatment. 2. Used for cleaning various molds. 3, can remove all kinds of mechanical tensile stress, increase fatigue life. 4, semiconductor devices, plastic sealing on the tube before cleaning to remove thorns. 5, equipment, textile machinery and all kinds of hardware products shot peening enhanced finishing processing. 6, all kinds of metal pipes, non-ferrous metal precision castings cleaning and removal of burr residue.
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