Characteristics and application fields of silicon carbide

Overview of Silicon Carbide

Silicon carbide (SiC) is made from quartz sand, petroleum coke, wood chips, etc., which are smelted at high temperature 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 modern non-oxide, C, N, B and other high-tech refractories, silicon carbide is the most widely used and most economical one.

 Due to its stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and excellent wear resistance, silicon carbide has many other uses besides being used as abrasives. For example, silicon carbide powder is applied to turbine wheels or cylinder blocks through a unique process. The inner wall can improve its wear resistance and prolong its service life by 1 to 2 times. The high-grade refractory materials used have heat shock resistance, small size, light weight, high strength and good energy-saving effect. Low-grade silicon carbide (containing about 85% silicon carbide) is an excellent deoxidizer; it can be used to speed up the tapping speed, chemical composition, easy to control and improve the quality of steel. return,

Silicon carbide products can be divided into many types, which are divided into different types according to different environments. It is usually used for more machinery. For example, for mechanical seals, the sealing ring is silicon carbide, which can be divided into static ring, sealing ring, and flat ring. We can also produce various shapes of silicon carbide products according to customers' unique requirements, such as silicon carbide special-shaped parts, silicon carbide plates, silicon carbide rings, silicon carbide bearings, etc.

 Silicon carbide ceramics have high hardness, high corrosion resistance, and high temperature strength, which makes silicon carbide ceramics widely used.

 In the application of sealing ring, silicon carbide ceramic has the characteristics of chemical resistance, high strength, high hardness, excellent wear resistance, low friction coefficient, high temperature resistance, etc. It is an ideal material for sealing ring. When combined with graphite materials, its friction coefficient is smaller than that of alumina ceramics and cemented carbide, so it can be used for high PV values, especially in working environments where strong acids and alkalis are transported.

 The four main application areas of silicon carbide are functional ceramics, advanced refractories, abrasives and metallurgical materials.

 1. Abrasives field

Silicon carbide can be used to produce grinding wheels, sandpaper, abrasive belts, abrasive blocks, grinding discs, polishing pastes and photovoltaic products, such as the grinding and polishing of piezoelectric crystals in the electronics industry such as monocrystalline silicon and polycrystalline silicon.

 2. Highly refractory materials

Silicon carbide has the characteristics of corrosion resistance, high temperature resistance, high strength, good thermal conductivity, and impact resistance. On the one hand, it can be used for the lining components of various silicon carbide smelting furnaces. Silicon crucible. On the other hand, silicon carbide materials can be used in indirect heating of high-temperature non-ferrous metal smelting industries, such as vertical distillation furnaces, distillation furnace trays, aluminum electrolysis cells, copper smelting furnaces, electric arc furnace zinc plates, thermocouple protection tubes; for production Advanced silicon carbide ceramic materials such as wear resistance, corrosion resistance and high temperature resistance; also manufacture rocket nozzles and gas turbine blades. In addition, silicon carbide is a highway,

 3. Chemical industry

Silicon carbide can be used as a deoxidizer, and the steel cast iron structure of the modifier is also used to produce silicon tetrachloride. It is the main raw material of the silica gel industry. Silicon carbide is a new type of deoxidizer active deoxidizer compound, which replaces the traditional silicon powder and carbon deoxidation. It has more stable physical and chemical properties than the original process, good deoxidation effect, shorter deoxidation time, energy saving, and integrated steelmaking to improve economic benefits, Improving the quality of steel, reducing the consumption of raw materials, reducing environmental pollution, improving working conditions, and improving the furnace are of important value.

 4. Non-ferrous metal smelting field

Silicon carbide has the advantages of high temperature resistance, high strength, good thermal conductivity, and impact resistance. It is used for indirect heating of high-temperature materials, such as active distillation furnaces, distillation furnace trays, aluminum electrolytic cells, copper lining furnaces, electric arc furnace zinc plates, thermocouples Protective tube.

 5. Rigidity

The use of silicon carbide is corrosion-resistant, thermal shock-resistant, wear-resistant, and thermally conductive. It is suitable for large-scale blast furnace linings and improves service life.

 6. Metallurgical beneficiation

The hardness of silicon carbide is second only to diamond, and it has strong wear resistance. It is an ideal material for wear-resistant pipes, impellers, pump chambers, cyclones, and mine barrel linings. Its wear resistance is 5-20 times the life of cast iron and rubber, so it is one of the ideal materials for air runways.

 7. Pottery wheel for building materials industry

Silicon carbide has the characteristics of high thermal conductivity and heat dissipation. The manufacture of kiln furniture plates can not only reduce the kiln capacity and loading, but also improve the product quality of the kiln and shorten the production cycle. It is a ceramic glaze on the sintered indirect material.

 8. Jewelry

Synthetic silicon carbide, also known as synthetic moissanite, has the same diamond luster as diamonds, and has a stronger "fire color", which is closer than the previous imitation diamonds.

Silicon carbide nanomaterials have high band gap, high critical breakdown electric field and thermal conductivity, small dielectric constant and high electron saturation mobility, as well as strong radiation resistance and good mechanical properties. It is an ideal material for high frequency, high power electronics and optoelectronic devices, low energy consumption, high temperature resistance, radiation resistance device.

Application of silicon carbide

Low bulk density, with excellent mechanical, thermal, electrical and chemical properties, namely high hardness, high wear resistance, good self-lubrication, high thermal conductivity, low thermal expansion coefficient and high high temperature strength. Nano silicon carbide powder has the characteristics of high purity, small particle size distribution range, large specific surface area, etc.: This product has stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and good wear resistance. The microhardness is 2840~3320kg/mm2. Its hardness is between corundum and diamond, and its mechanical strength is higher than that of corundum. Nano silicon carbide has excellent thermal conductivity and is also a kind of semiconductor, which can resist oxidation at high temperatures, and manufacture structural equipment:

Silicon carbide price

The price of silicon carbide will vary randomly with the production cost, transportation cost, international situation and the market supply and demand of nano silicon carbide. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for nano silicon carbide products, please feel free to send an inquiry to get the latest price of nano silicon carbide.

Silicon carbide suppliers

As a global supplier of silicon carbide, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including boron carbide, hard alloy aluminum, titanium carbide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.