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Properties and Application Fields of Silicon Carbide

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Update time : 2019-12-25 16:06:28
Silicon carbide (SiC) is made of quartz sand, petroleum coke, wood chips, and other raw materials by high-temperature smelting in a resistance furnace. Silicon carbide is also found in nature, but it is relatively rare. The main component of a mineral called Moissanite is silicon carbide. Among contemporary non-oxide, high-tech refractory materials such as C, N, B, silicon carbide is the most widely used and economical one.
 
Because of its stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and excellent abrasion resistance, silicon carbide has many other uses besides being used as an abrasive. For example, silicon carbide powder is applied to a turbine wheel or cylinder block by a unique process. The inner wall can improve its abrasion resistance and extend its service life by 1 to 2 times. The high-grade refractory material used is made of heat-resistant shock, small size, lightweight, high strength, and good energy-saving effect. A low-grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer; it may be used to accelerate the speed of steel, the chemical composition, and easy to control and improve the quality of steel. Also, the silicon carbide electric heating element is also used extensively for the production of silicon carbide.
 
Silicon carbide products can be divided into many categories, depending on the environment, divided into different types. It is generally used to more mechanical. For example, to the mechanical seal, the sealing ring is silicon carbide, it can be divided into the static ring, ring, flat ring. We can also make silicon carbide products of various shapes according to the unique requirements of customers, such as silicon carbide shaped parts, silicon carbide plates, silicon carbide rings, silicon carbide bearings, etc.
 
Silicon carbide ceramics have the characteristics of high hardness, high corrosion resistance, and high temperature strength, which makes silicon carbide ceramics widely used.
 
In the Application of the sealing ring, the silicon carbide ceramics chemical resistance, high strength, high hardness, excellent wear resistance, low friction coefficient, and high temperature, so it is an ideal material for a sealing ring. When it is combined with a graphite material, its friction coefficient is smaller than that of alumina ceramics and hard alloys, so it can be used in high PV values, especially in working environments that transport strong acids and alkalis.
 
The four primary application areas of silicon carbide are functional ceramics, advanced refractories, abrasives, and metallurgical materials.
 
1. Abrasives and abrasives field
Silicon carbide may be used for production wheel, sandpaper, abrasive belt, grinding blocks, grinding, polishing paste and photovoltaic products monocrystalline silicon, polycrystalline silicon, and other electronics industry piezoelectric crystal grinding, polishing and the like.
 
2. The High refractories field
Silicon carbide has corrosion, high temperature, high strength, good thermal conductivity, impact resistance, and other characteristics, on the one hand, can be used for a variety of silicon carbide smelting furnace lining member high-temperature furnace, SiC board, plate, a support member, sagger, silicon carbide crucible. On the other hand, the silicon carbide material may be used for indirect heating high-temperature non-ferrous metal smelting industry, such as the vertical retort furnace, distillation furnace trays, aluminum electrolysis cell, lined with copper melting furnace, arc furnace zinc plate, thermocouple protection tube; for the production of wear, corrosion, high temperature, and other advanced silicon carbide ceramic material; also making rocket nozzles, the gas turbine blades. In addition, silicon carbide is the highway, one of the ideal materials for aviation runway solar water heaters and the like.
 
3. chemical industry
Silicon carbide can be used as a deoxidizer, and modifiers' steel cast iron structure is also used to produce silicon tetrachloride. It is the primary raw material of the silicone industry. SiC is a new deoxidizer active deoxidizer compound, instead of the traditional silicon powder and carbon deoxidation, and the physical and chemical properties compared to the original process is more stable, good deoxidation effect, deoxidation time is shortened, saving energy, integrated steel-making to improve the economic efficiency, improve the quality of steel to reduce raw material consumption, reduce environmental pollution, improve working conditions, improve furnace are of great value.
 
4. The non-ferrous smelting FIELD
Silicon carbide has a high temperature, high strength, good thermal conductivity, impact resistance, for indirect heating high-temperature materials, such as active retort furnace, distillation furnace trays, aluminum electrolysis cell, lined with the copper melting furnace, arc furnace zinc plate, thermocouple protection tubes.
 
5. Steel
The use of silicon carbide corrosion resistance, thermal shock resistance, abrasion, thermal conductivity, and suitable for large blast furnace lining increases the service life.
 
6. metallurgical beneficiation
Silicon carbide hardness second only to diamond, with strong wear resistance, is an ideal material for wear-resistant pipe, impeller, pump chamber, cyclone, ore bucket liner. Its wear resistance is 5 - 20 times the life of cast iron and rubber, and therefore one of aviation runway ideal material.
 
7. Building Materials Industry pottery wheel
Silicon carbide with high thermal conductivity, heat radiation characteristics, manufacturing kiln furniture sheet, not only to reduce kiln capacity, loading capacity, and also improve the product quality of the furnace, reducing the production cycle, a ceramic glaze over the fritting indirect material.
 
8. Jewelry
Synthetic silicon carbide, also known as synthetic Moissanite, has the same diamond adamantine luster, "fire color" stronger, closer than ever imitation diamonds.