Silicon carbide is used in all industries.

Emery, also known as silicon carbide (SiC), is made of quartz sand, petroleum coke (or coal coke), sawdust (salt is needed in the production of green silicon carbide) and other raw materials by high temperature smelting in a resistance furnace. Silicon carbide also exists in nature as a rare mineral-molybdenite. Silicon carbide is also known as moissanite. Among the non-oxide high-tech refractory materials such as carbon, nitrogen and boron, silicon carbide is the most widely used and economical one, which can be called diamond sand or refractory sand. At present, silicon carbide produced in China is divided into black silicon carbide and green silicon carbide, both of which are hexagonal crystals with specific gravity of 3.20 ~ 3.25 and microhardness of 2840 ~ 3320kg/mm2.

applied range

Silicon carbide has four main application fields, namely: functional ceramics, advanced refractories, abrasives and metallurgical raw materials. Crude silicon carbide can be supplied in large quantities, which is not a high-tech product, and the application of nano silicon carbide powder with high technical content cannot form economies of scale in a short time.

(1) as abrasive, can be used as abrasive tools, such as grinding wheel, whetstone, grinding head, sand tile, etc.

⑵ Used as metallurgical deoxidizer and high temperature resistant material.

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

Main uses: used for wire cutting of 3- 12 inch monocrystalline silicon, polycrystalline silicon, potassium arsenide, timely crystal, etc. Engineering processing materials for solar photovoltaic industry, semiconductor industry and piezoelectric crystal industry.

It is used in the fields of semiconductors, lightning rods, circuit components, high-temperature applications, ultraviolet detectors, structural materials, astronomy, disc brakes, clutches, diesel particulate filters, filament pyrometers, ceramic membranes, cutting tools, heating elements, nuclear fuel, jewelry, steel, protective gear, catalyst carriers and so on.

abrasive

Mainly used for grinding and polishing grinding wheels, sandpaper, abrasive belts, oilstones, grinding blocks, grinding heads, grinding pastes, monocrystalline silicon, polycrystalline silicon and piezoelectric crystals in the electronic industry.

chemical industry

It can be used as deoxidizer for steelmaking and improver for cast iron structure, and also can be used as raw material for manufacturing silicon tetrachloride, which is the main raw material of silicone resin industry. Silicon carbide deoxidizer is a new powerful compound deoxidizer, which replaces the traditional silicon powder carbon powder for deoxidization. Compared with the original process, the physical and chemical properties are more stable, the deoxidation effect is good, the deoxidation time is shortened, the energy is saved, the steelmaking efficiency is improved, the steel quality is improved, the consumption of raw and auxiliary materials is reduced, the environmental pollution is reduced, the working conditions are improved, and the comprehensive economic benefits of the electric furnace are improved.

"Three-proof" materials

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 for various smelting furnace linings, high-temperature furnace parts, silicon carbide plates, linings, supports, saggers, silicon carbide crucibles and the like.

On the other hand, it can be used for high-temperature indirect heating materials in nonferrous metal smelting industry, such as vertical tank distillation furnace, distillation furnace tray, aluminum electrolytic cell, copper smelting furnace lining, arc plate for zinc powder furnace, thermocouple protection tube and so on. Used for manufacturing advanced silicon carbide ceramic materials with wear resistance, corrosion resistance and high temperature resistance; It can also be used to make rocket nozzles and gas turbine blades. In addition, silicon carbide is also one of the ideal materials for solar water heaters on expressways and airstrips.

nonferrous metal

Silicon carbide has high temperature resistance, high strength, good thermal conductivity and impact resistance, and can be used as high-temperature indirect heating materials, such as retort, retort tray, aluminum electrolytic cell, copper melting furnace lining, arc plate for zinc powder furnace, thermocouple protection tube, etc.

steel

Using the characteristics of silicon carbide, such as corrosion resistance, thermal shock resistance, wear resistance and good thermal conductivity, it is used in the lining of large blast furnace to improve its service life.

Metallurgical beneficiation

The hardness of silicon carbide is second only to that of diamond, and its wear resistance is strong. It is an ideal material for wear-resistant pipes, impellers, combustion chambers, cyclones and hoppers, and its wear resistance is 5-20 times that of cast iron and rubber. Def is also one of the ideal materials for aviation flight runway.

Building materials ceramic grinding wheel industry

Using its characteristics of high thermal conductivity, heat radiation and high heat intensity, manufacturing thin-plate kiln furniture can not only reduce the volume of kiln furniture, but also improve the loading capacity and product quality of kiln and shorten the production cycle. It is an ideal indirect raw material for firing and sintering ceramic glaze.

conservation of energy

Using good thermal conductivity and thermal stability as a heat exchanger can reduce fuel consumption by 20%, save fuel by 35% and improve productivity by 20-30%, especially for the internal placement of discharge conveying pipes in mine concentrator, and its wear resistance is 6-7 times that of ordinary wear-resistant materials.

Abrasive particle size and its composition conform to GB/T 2477-83. The determination method of abrasive particle size composition is GB/T 248 1-83.

jewels

Synthetic silicon carbide, also known as synthetic Mosanite and synthetic moissanite (chemical composition SiC), has a dispersion of 0. 104 greater than that of diamond (0.044) and a refractive index of 2.65-2.69 (2.42 of that of diamond), which has the same diamond luster and stronger "fire color" and is closer to diamond than any previous imitation. This is made by C3 Company in North Carolina, USA. It has patents for the production and synthesis of silicon carbide in all countries of the world and is being popularized and applied all over the world.