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What is Silicon Carbide - Introduction to SiC powder

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Update time : 2023-07-05 15:04:08
What is Silicon Carbide (SiC)?
Silicon carbide  belongs to the third generation of semiconductor materials. Compared with ordinary silicon materials, silicon carbide has outstanding advantages. It not only overcomes some disadvantages of ordinary silicon materials but also has very good performance in power consumption, thus becoming the most promising semiconductor material in the field of power electronics at present. Because of this, more and more semiconductor companies have started to enter the SiC market.
Silicon carbide (SiC) and gallium nitride (GaN), aluminum nitride (ALN), gallium oxide (Ga2O3), etc., are collectively known as wideband semiconductor materials because of the forbidden bandwidth greater than 2.2eV and are also known as the third generation semiconductor materials in China.
Discovery of silicon carbide
The first discovery of silicon carbide in human history was in 1891, when American Acheson discovered a compound of carbon in the electrolysis of diamond, which was the first synthesis and discovery of silicon carbide. Subsequently, after intensive research, scientists from various countries finally sorted out the advantages and properties of silicon carbide and invented a variety of silicon carbide long crystal technology, industrial research before and after up to 70 years.
All this was changed by Tesla; Tesla was the first car company in the industry to propose the use of silicon carbide instead of silicon, and it boldly used it in Tesla's Modal3, then other car manufacturers followed suit, and silicon carbide ushered in the stage of large-scale car, so the industry believes that the first year of development of silicon carbide is in 2019, Tesla this bold move, kicked off the high-speed development of carbonization.
Crystalline type of silicon carbide
SiC crystalline form has two forms: α and β. When the reflection temperature is lower than 1600, the reaction product is in the form of β-SiC; when the reflection temperature is higher than 1600, β-SiC gradually transforms into various polymorphs of α-SiC, and when the reflection temperature is 2400, it completely transforms into α-SiC. SiC is made from raw materials C, SiO2, NaCl, and wood chips, smelted at high temperatures.
The SiC made by this smelting presents a colorless and transparent crystal state if it does not contain impurities, a green crystal state if it contains a small number of impurities, and a black crystal state if it contains more impurities, which is due to the impurities such as Al and Fe usually contained in the reaction raw materials quartz sand and coke, which produce impurities.
The physical and chemical properties of SiC
1. oxidation resistance
The most important property of SiC particles is their oxidation resistance. This is mainly because, at room temperature, SiC particles react chemically with oxygen in the air, thus forming a protective film - SiO2 film - on the surface of SiC particles. At the same time, as the particle size of SiC becomes smaller and the specific surface area becomes larger, the number of this protective film increases, thus inhibiting further oxidation and preventing the continued reaction between oxygen and SiC, which slows down the oxidation of SiC and makes SiC have good antioxidant properties.
2. Chemical stability
Since SiC can react with oxygen in the air at room temperature to form a protective film of SiO2, SiC cannot react with strong acids at high temperatures, thus resulting in a certain degree of chemical stability.
Silicon carbide applications
1. High-temperature resistant reinforcing material:
Because of its hardness and its mechanical stability in high temperature, it has excellent thermal conductivity and a low energy density, and high corrosion resistance, as well as resistance to oxidation SiC can be converted into silicon carbide fibres that are used primarily as high-temperature-resistant materials as well as reinforcing materials. High-temperature resistant materials comprise heat shielding material, high-temperature conveyor belts that are resistant to heat. They are used as reinforcement materials typically paired by carbon or glass to improve the performance of the strength of metal (such like aluminium) and ceramics.
2. Abrasives:
Silicon carbide is extremely hard chemical stability and certain durability, which is why it can be used for the production of solidified abrasives coated abrasives and free grinding in order to process ceramics, glass stone casting iron, certain non-ferrous metals like titanium alloy, cemented carbide high-speed steel tools and grinding wheels, among others.
3. Chemical use:
Since silicon carbide is decomposed by molten steel and oxygen-free steel, the metal oxides react and produce carbon monoxide as well as silicon-rich slag. It can also be used to purify smelting steel also known as a deoxidizer in steelmaking, and improver of cast iron tissue. It can also be utilized as a raw material to manufacture silicon Tetrachloride.
4. Semiconductor materials:
Silicon carbide one-dimensional nanomaterials, due to their own microscopic morphology and crystal structure make it have unique excellent performance and more extensive application prospects, and they are widely believed to be expected to become an important component unit of the third generation of wide bandgap semiconductor materials, suitable for high temperature, high frequency, radiation resistance, and high-power device fabrication.
silicon carbide supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Nickel Titanium, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective silicon carbide powder, you are welcome to contact us or inquire at any time.
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