| Customization: | Available |
|---|---|
| CAS No.: | 409-21-2 |
| Formula: | Csi |
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| Name | Silicon carbide |
| Molecular Formula | CSi |
| Molecular Weight | 40.10 |
| CAS Registry Number | 409-21-2 |
| EC Number | 206-991-8 |
| Density | 3.22 |
|---|---|
| Melting point | 2700 ºC |
High purity silicon carbide is a colorless, transparent crystalline or amorphous powder. Silicon carbide containing impurities appears green, while solid solution containing carbon and metal oxide impurities appears black. Decomposition occurs at 2500 ºC under normal pressure. Relative density 3.20-3 25, dielectric constant 7.0, resistivity at room temperature 102M.cm. The hardness of silicon carbide is very high, with a Mohs hardness of 9.2-9.5, but slightly lower than several materials such as diamond and cubic boron nitride. The thermal conductivity of silicon carbide is very high, about twice that of silicon nitride; Its coefficient of thermal expansion is about half that of aluminum oxide; The bending strength is close to that of silicon nitride material, but the fracture toughness is smaller than that of silicon nitride. Insoluble in water and general acids. It has good chemical stability and chemical inertness. Do not react with mixed acids of hydrofluoric acid and nitric acid; When in contact with molten alkali metals, they slowly decompose into carbonates and silicates, and when heated, they react with a mixture of potassium dichromate and lead chromate. It has excellent high-temperature strength and high-temperature creep resistance, and the high-temperature bending strength of hot pressed silicon carbide material at 1600 ºC is basically the same as that at room temperature.
Green silicon carbide micro powder, as a high-performance industrial material, is mainly used in the following fields:
1, Grinding and polishing
Suitable for grinding high hardness metal materials such as hard alloys, titanium alloys, high-speed steel cutting tools, etc;
Used for cutting and polishing non-metallic materials such as optical glass, ceramics, gemstones, agate, etc;
It can produce grinding wheels, oilstones, sandpaper and other grinding tools, which are used for precision machining of components such as cylinder liners and bearings.
2, Semiconductor and Electronics Industry
As a wire cutting material for 3-12-inch monocrystalline silicon, polycrystalline silicon, and quartz crystals;
Used for grinding and surface treatment of semiconductor wafers to reduce processing damage;
Conductive materials for manufacturing electronic components such as transistors and integrated circuits.
3, Refractory and high-temperature materials
Manufacturing high-temperature resistant components such as kiln structural parts, high-temperature nozzles, combustion chambers, etc;
As a lining material for high melting point alloy casting shells;
Applied to high-temperature environmental components such as automotive valve plates and aviation nozzles.
4, Coatings and Surface Treatment
Improve the wear resistance of industrial coatings, suitable for fields such as flooring and mining machinery;
Enhance the corrosion resistance of coatings, used for anti-corrosion of chemical equipment and marine engineering;
Improve the weather resistance and fire resistance of building exterior wall coatings.
5, Special ceramic manufacturing
Used for high-performance ceramic cutting tools, bearings and other structural ceramics;
Manufacturing functional ceramics such as thermistors and piezoelectric ceramics;
Improve the hardness, wear resistance, and surface smoothness of ceramic products.
6, Other applications
Metallurgical industry as deoxidizer and alloy additive;
Plastic modified reinforcement materials;
Environmental protection fields such as exhaust gas treatment.
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