Product introduction: 

It is produced by quartz sand and high-quality anthracite at high temperature. This product is suitable for the processing of low-strength metal materials and non-metallic materials such as metal, copper, aluminum, stone, leather, hard rubber, etc., and can also be used as refractory materials and the electronics industry.

Material characteristics: 

Silicon carbide has stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance. In addition to being used as an abrasive, there are many other uses, such as: applying silicon carbide powder to the impeller of a water turbine by a special process The inner wall of the cylinder block can improve its wear resistance and extend the service life by 1 to 2 times; the advanced refractory materials used to make it are heat-resistant shock, small size, light weight and high strength, and good energy saving effect. Low-grade silicon carbide (containing about 85% of SiC) is an excellent deoxidizer. It can accelerate the steel-making speed, and facilitate the control of chemical composition and improve the quality of steel. In addition, silicon carbide is also widely used to make silicon carbide rods for electric heating elements.

The hardness of silicon carbide is very large, Mohs hardness is 9.5, second only to the world's hardest diamond (10), it has excellent thermal conductivity, is a semiconductor, it can resist oxidation at high temperature.

Pure silicon carbide is colorless, and industrially produced brown to black is due to impurities containing iron. The rainbow-like luster on the crystal is caused by the protective layer of silicon dioxide on the surface.

Production process: 

Due to the low natural content, silicon carbide is mostly artificial. A common method is to mix quartz sand with coke, use the silica and petroleum coke in it, add table salt and wood chips, put it in an electric furnace, heat it to a high temperature of about 2000 ° C, and obtain silicon carbide fine powder after various chemical processes .

Silicon carbide (SiC) has become an important abrasive because of its great hardness, but its application range exceeds that of ordinary abrasives. For example, its high temperature resistance and thermal conductivity make it one of the preferred kiln furniture materials for tunnel kilns or shuttle kilns. Its electrical conductivity makes it an important electric heating element. The preparation of SiC products first requires the preparation of SiC smelting blocks [or called: SiC pellets, because they contain C and are super-hard, so SiC pellets were once called: emery. But pay attention: it has a different composition from natural emery (also known as: garnet). In industrial production, SiC smelting blocks usually use quartz, petroleum coke, etc. as raw materials, auxiliary recovery materials, waste materials, and are prepared through grinding and other processes to form a charge with a reasonable ratio and a suitable particle size (in order to adjust the permeability of the charge, an appropriate amount needs to be added Wood chips, the preparation of green silicon carbide must also add an appropriate amount of salt) prepared by high temperature. The thermal equipment for high-temperature preparation of SiC smelting blocks is a special silicon carbide electric furnace. Its structure consists of the bottom of the furnace, the end wall with electrodes on the inside, the detachable side wall, and the core body (full name: the energized heating body in the center of the electric furnace, generally Use graphite powder or petroleum coke to install in the center of the charge according to a certain shape and size, generally round or rectangular.

Capacity situation: 

There are more than 200 silicon carbide smelting enterprises in China, with an annual production capacity of more than 2.2 million tons (including: more than 1.2 million tons of green silicon carbide blocks and about 1 million tons of black silicon carbide blocks). The power of the smelting transformer is mostly 6300 ~ 12500kVA, and the largest smelting transformer is 32000kVA. There are more than 300 sand and fine powder production enterprises with annual production capacity of more than 2 million tons. The silicon carbide smelting production process, technical equipment and energy consumption per ton have reached the world's leading level.According to the data of the Silicon Carbide Expert Committee of the China Machine Tool Industry Association Abrasives Special Committee, as of the end of 2012, the global silicon carbide production capacity reached more than 2.6 million tons, 13 countries with production capacity of more than 10,000 tons, accounting for 98 %. Among them, China's silicon carbide production capacity reached 2.2 million tons, accounting for 84% of the global total production capacity.

 product

Silicon carbide products can be divided into many categories, according to different use environments, divided into different categories. Generally used more mechanically. For example, it is used for mechanical seals, which can be called silicon carbide sealing rings, which can be divided into static rings, moving rings, and flat rings. It can also produce silicon carbide products of various shapes, such as silicon carbide shaped parts, silicon carbide plates, silicon carbide rings, etc. according to the special requirements of customers.

Silicon carbide ceramics, one of the products of silicon carbide, have the characteristics of high hardness, high corrosion resistance and high high temperature strength, which make silicon carbide ceramics widely used.

Application in sealing ring:

 Silicon carbide ceramic has good chemical resistance, high strength, high hardness, good wear resistance, small friction coefficient, and high temperature resistance, so it is an ideal material for manufacturing sealing rings. When it is paired with graphite materials, its friction coefficient is smaller than that of alumina ceramics and cemented carbides, so it can be used in high PV values, especially in the delivery of strong acids and alkalis. The SIC-1 silicon carbide atmospheric pressure sintered product produced by our company has the characteristics of high density, high hardness, large production batch, and can produce complex shape products. It is suitable for use in high-performance seals, especially high PV value and Resistant to strong acid and alkali conditions. The SIC-3 silicon carbide ceramic products produced by our company are graphite-containing silicon carbide materials. Due to the large amount of dispersed fine graphite particles in the silicon carbide matrix, when used in conjunction with other materials, its friction coefficient is very small, with good self-lubricating properties, especially suitable for the production of gas seals or dry friction seals In use, so that the service life of the seal and the reliability of the work are improved. 

Application range

Silicon carbide has four main application areas, namely: functional ceramics, advanced refractory materials, abrasives and metallurgical raw materials. Coarse silicon carbide materials can already be supplied in large quantities and cannot be regarded as high-tech products, and the application of nano-scale silicon carbide powders with extremely high technical content cannot form economies of scale in a short time. 

(1) As an abrasive, it can be used as an abrasive tool, such as grinding wheels, whetstones, grinding heads, sand tiles, etc.

⑵As metallurgical deoxidizer and high temperature resistant material.

(3) High-purity single crystal can be used to manufacture semiconductors and silicon carbide fibers.

Main application: Used for wire cutting of 3-12 inch monocrystalline silicon, polycrystalline silicon, potassium arsenide, quartz crystal, etc. Engineering materials for solar photovoltaic industry, semiconductor industry, piezoelectric crystal industry.

Used in semiconductors, lightning rods, circuit components, high temperature applications, ultraviolet detectors, structural materials, astronomy, disc brakes, clutches, diesel particulate filters, filament pyrometers, ceramic films, cutting tools, heating elements, nuclear fuel , Jewelry, steel, protective gear, catalyst body and other fields.

Abrasives

It is mainly used for grinding and polishing of grinding wheels, sandpaper, abrasive belts, whetstones, grinding blocks, grinding heads, abrasive pastes, and monocrystalline silicon, polycrystalline silicon in photovoltaic products and piezoelectric crystals in the electronics industry.

Chemical industry

It can be used as a deoxidizer for steel making and a modifier for the structure of cast iron. It can be used as a raw material for manufacturing silicon tetrachloride, and is the main raw material for the silicone resin industry. Silicon carbide deoxidizer is a new type of strong composite deoxidizer, which replaces 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, the deoxidation time is shortened, energy saving, and improvement Steelmaking efficiency, improving steel quality, reducing consumption of raw and auxiliary materials, reducing environmental pollution, improving working conditions, and improving the overall economic benefit of electric furnaces have important values.

"Three resistance" material

The use of silicon carbide has the characteristics of corrosion resistance, high temperature resistance, high strength, good thermal conductivity, and impact resistance. On the one hand, silicon carbide can be used in various smelting furnace linings, high temperature furnace components, silicon carbide plates, lining plates, supports, saggers , Silicon carbide crucible, etc.

On the other hand, it can be used for high-temperature indirect heating materials in the non-ferrous metal smelting industry, such as vertical tank distillation furnace, rectification furnace tray, aluminum electrolyzer, 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, high temperature resistance; can also be used to make rocket nozzles, gas turbine blades, etc. In addition, silicon carbide is also one of the ideal materials for solar water heaters on highways and aviation runways.

Non-ferrous metals

Using silicon carbide has high temperature resistance, high strength, good thermal conductivity, impact resistance, as high temperature indirect heating materials, such as hard tank distillation furnace, rectification furnace tray, aluminum electrolytic cell, copper melting furnace lining, zinc powder furnace arc Type plate, thermocouple protection tube, etc.

Steel

The use of silicon carbide's corrosion resistance, thermal shock resistance, wear resistance, and good thermal conductivity is used in the lining of large blast furnaces to increase the service life.

Metallurgical beneficiation

Silicon carbide is second only to diamond in hardness and has strong wear resistance. It is an ideal material for wear-resistant pipes, impellers, pump chambers, cyclones, and bucket linings. Its wear resistance is the life of cast iron. --20 times & def is also one of the ideal materials for aviation flight runway.

Building Materials Ceramic Wheel Industry

Using the characteristics of thermal conductivity, heat radiation and high thermal strength to manufacture thin plate kiln furniture, not only can reduce the capacity of the kiln furniture, but also improve the kiln's installed capacity and product quality, shorten the production cycle, is the ceramic glaze baking sinter Ideal indirect material.

Energy saving

Using good heat conduction and thermal stability, as a heat exchanger, the fuel consumption is reduced by 20%, the fuel is saved by 35%, and the productivity is increased by 20-30%, especially the internal discharge discharge pipeline used in the mine dressing plant, its wear resistance It is 6-7 times that of ordinary wear-resistant materials.

The abrasive particle size and its composition are according to GB / T2477--83. The determination method of abrasive particle size composition is according to GB / T2481-83.

Jewellery

Synthetic silicon carbide (Synthetic Moissanite), also known as synthetic moissanite and synthetic moissanite (chemical composition SiC), has a dispersion of 0.104 larger than that of diamond (0.044), a refractive index of 2.65-2.69 (diamond 2.42), and has the same diamond luster as diamond "Fire color" is stronger and closer to diamonds than any previous imitation. This is from North Carolina, USA The C3 company manufactures and has patents for the production of synthetic silicon carbide in various countries in the world, and it is being promoted and applied worldwide.

Sandblasting to remove rust:

The product is made of brown corundum fine powder, extruded under high pressure, sintered at high temperature, with moderate hardness, clean and unbreakable. It can be used repeatedly for many times and has good sandblasting effect.

1. The surface of the steel, steel pipe, steel structure stainless steel products is matt treated, and sandblasted and derusted before spraying.

2. Used for cleaning various molds.

3. It can remove the tensile stress of various mechanical parts and increase the fatigue life.

4. The semiconductor devices and plastic packages should be cleaned before removing tin on the tube to remove edge thorns.

5. Shot peening treatment of medical equipment, textile machinery and various hardware products.

6. Cleaning and removing burr residues of various metal pipes and non-ferrous metal precision castings.