A list,
Production process and characteristics: Black Silicon Carbide is produced by high temperature smelting of quartz sand, petroleum coke (or coal coke), wood chips, etc., through resistance furnace. In C, N, B and other non-oxide refractory materials, silicon carbide is widely used and economical because of its stable chemical properties, small thermal conductivity, small thermal expansion coefficient and good abrasion resistance. At present, the industrial silicon carbide is divided into black silicon carbide and green silicon carbide, both of which are hexagonal crystals.
Silicon carbide performance: the thermal conductivity and heat capacity of silicon carbide products have a direct impact on their other functions, such as the permeability of silicon carbide data, which to a large extent determines the thermal stability of silicon carbide products.
1. Thermal conductivity. The thermal conductivity of fine silicon carbide decreases with the increase of temperature, but that of light silicon carbide increases with the increase of temperature.
2. Heat capacity. According to different compositions, the heat capacity of various sic refractory materials does not change much, and with the increase of temperature, its value also increases.
3. Silicon carbide is highly resistant to chemical corrosion. Si in the raw material silicon carbide has a high affinity for oxygen, and the reaction between silicon and oxygen in the aqueous medium causes dullness. At the temperature of 1500 degrees Celsius, the antioxidant capacity of pure silicon carbide is also twice as high as that of today's excellent super alloy at its high service temperature of 1200 degrees Celsius.
Ii. Main chemical indexes of black silicon carbide?
Black silicon carbide sand
SiC 98%
Fe2O3 0.50%
0.25% f.
Melting point (2250 ℃)
High service temperature (℃) 1900
The proportion of 3.90 g/cm3
Mohs hardness is 9.15
Iii. Main purpose
Abrasives:
It is mainly used for grinding and polishing of grinding wheel, sandpaper, belt, whetstone, grinding block, grinding head, grinding paste, monocrystalline silicon in photovoltaic products, polycrystalline silicon and piezoelectric crystal in electronic industry.
Chemical industry:
It can be used as deoxidizer for steelmaking and improver for cast iron structure, and as raw material for making silicon tetrachloride, which is the main raw material of silicone resin 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-resistant, fire-resistant and corrosion-resistant materials:
Silicon carbide has the characteristics of corrosion resistance, high temperature resistance, high strength, good thermal conductivity, impact resistance, etc., on the one hand, silicon carbide can be used in various smelting linings, high temperature furnace components, silicon carbide plate, linings, support pieces, saggers, silicon carbide crucible, etc. On the other hand, it can be used for indirect heating materials at high temperature in non-ferrous metal smelting industry, such as vertical pot distillation furnace, distillation furnace tray, aluminum electrolysis tank, copper melting furnace lining, zinc powder furnace arc plate, thermocouple protection tube, etc. Used for making advanced silicon carbide ceramic materials such as wear resistance, corrosion resistance and high temperature resistance. Also can make rocket nozzle, gas turbine blade and so on. In addition, silicon carbide is also one of the ideal materials for solar water heaters on highways and airstrips.
Non-ferrous metals:
The use of silicon carbide has high temperature resistance, high strength, good thermal conductivity, impact resistance, as high temperature indirect heating materials, such as solid pot distillation furnace, distillation furnace tray, aluminum electrolysis tank, copper melting furnace lining, zinc powder furnace arc plate, thermocouple protection tube.
Steel:
With the characteristics of corrosion resistance, thermal shock resistance, wear resistance and good heat conduction, sic is used as lining of large blast furnace to improve the service life.
Metallurgical mineral processing:
The hardness of sic is second only to diamond, and it has strong wear-resisting property, which is the ideal material for wear-resisting pipe, impeller, pump room, cyclone and lining of ore bucket, and its wear-resisting property is cast iron.
Building materials ceramic grinding wheel industry
Making use of its characteristics of thermal conductivity, thermal radiation and high thermal intensity, the thin plate kiln furniture can not only reduce the capacity of kiln furniture, but also improve the loading capacity and product quality of kiln, and shorten the production cycle, which is an ideal indirect material for ceramic glaze baking and sintering.
Energy saving:
With good thermal conductivity and thermal stability, as a heat exchanger, the burn-up is reduced by 20%, fuel is saved by 35%, and productivity is 