Silicon carbide is a compound material composed of silicon (Si) and carbon (C), with a molecular formula of SiC, which is a combination of carbon and silicon. It is an inorganic material that is resistant to high temperatures, wear and corrosion. Its hardness is second only to diamond, and it has excellent properties such as high temperature strength and chemical inertness. Silicon carbide is an important functional ceramic material and semiconductor material, and is also one of the hot spots in the current research of new industrial materials.
Main properties
1. High temperature resistance: Silicon carbide has good high temperature stability and heat resistance, can work stably for a long time in a high temperature environment, and can withstand high temperatures up to 2700℃.
2. High thermal conductivity: Silicon carbide has a very high thermal conductivity, which is 3-4 times that of copper, and can effectively dissipate heat.
3. Corrosion resistance: Silicon carbide has good corrosion resistance and can work stably in a variety of chemical media such as acid, alkali, and salt.
4. High strength: Silicon carbide has high strength and tensile strength, which is more than 5 times that of steel.
5. High rigidity: Silicon carbide has high rigidity and elastic modulus, and can resist deformation and deformation well.
6. Bandgap width: The bandgap width of silicon carbide is larger than that of silicon, usually 2.2-3.3 electron volts (eV), while the bandgap width of silicon is about 1.1 eV.
7. Thermal conductivity: The thermal conductivity of silicon carbide is higher than that of silicon, so silicon carbide has better heat dissipation performance.
8. Electrical conductivity: The electron mobility of silicon carbide is higher than that of silicon, and it can respond to external signals faster, so it has a higher switching speed.
Main uses
1. Abrasives and grinding tools: Mainly used in the manufacture of grinding wheels, sandpaper, sanding belts, oilstones, grinding blocks, grinding heads, grinding pastes, and single crystal silicon, polycrystalline silicon in photovoltaic products and piezoelectric crystals in the electronics industry.
2. Metallurgical field: As a metallurgical deoxidizer and high temperature resistant material. It can be used as a new type of composite deoxidizer in the steelmaking process. Compared with traditional silicon powder and carbon powder, silicon carbide has more stable physical and chemical properties, faster deoxidation speed, shorter deoxidation time, can save energy, improve steelmaking efficiency, improve steel quality, reduce raw and auxiliary material consumption, reduce environmental pollution, and improve the comprehensive economic benefits of electric furnaces.
3. Semiconductor industry: High-purity single-crystal silicon carbide can be used to manufacture semiconductors.
4. Functional ceramics and advanced refractory materials: Silicon carbide can also be used to manufacture functional ceramics and advanced refractory materials.
5. Photovoltaic industry: Devices made of silicon carbide can effectively convert solar energy.
6. Other fields: Silicon carbide can also be used to manufacture silicon carbide fibers, lightning rods, circuit components, low-temperature use, ultraviolet detectors, structural materials, geography, disc brakes, clutches, diesel particulate filters, filament pyrometers, ceramic films, cutting tools, heating elements, nuclear fuel, jewelry, steel, protective gear, catalyst carriers and other fields.
What are the advantages over traditional deoxidizers?
1. Good stability: Silicon carbide deoxidizer has more stable physical and chemical properties than traditional silicon powder and carbon powder.
2. Good deoxidation effect: Silicon carbide has a fast deoxidation speed, early slag formation, a strong reducing atmosphere, and very rich foam, which can well reduce the oxygen content in steel and achieve the purpose of deoxidation of molten steel.
3. Improve element absorption rate: Silicon carbide can also effectively improve the absorption rate of elements.
4. Reduce costs: Silicon carbide can replace the more expensive traditional deoxidizers ferrosilicon powder and alloy powder to reduce steelmaking costs.
5. Improve the quality of steel: The use of silicon carbide deoxidizer can improve the quality of steel, stabilize the quality of molten steel, refine the grains, and remove harmful impurities in molten steel.
6. Environmental protection: The use of silicon carbide can reduce environmental pollution.
