Silicon Carbide

Silicon carbide, with the chemical formula SiC, is a compound formed by carbon and silicon elements bonded by strong covalent bonds. This material exists in nature in the form of the rare mineral moissanite, but is more often obtained through artificial synthesis. Silicon carbide has a variety of crystal structures, among which α-SiC (hexagonal system) and β-SiC (cubic system) are the most common.

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Performance:

High temperature stability: SiC has excellent high temperature stability and can maintain structural stability at temperatures up to 2000°C without melting.

Corrosion resistance: SiC has good corrosion resistance to a variety of chemical media, including acids, alkalis, salts, etc.

High hardness and wear resistance: SiC has a hardness second to diamond and has high wear resistance, making it an ideal abrasive and cutting tool material.

High thermal conductivity: The thermal conductivity of SiC is much higher than that of silicon, even exceeding that of some metal materials, so that it can still maintain excellent heat dissipation performance in high temperature environments.

Wide bandgap band structure: The bandgap width of SiC is larger than that of silicon, and it can withstand higher voltages and temperatures, making it potentially useful in power electronics and optoelectronic devices.

Applications:

1. Power electronics

SiC is most widely used in the field of power electronics, mainly in electronic components such as power transformers, power capacitors, inductors, power switches, IGBTs (insulated gate bipolar transistors), etc. Among them, IGBT is an important achievement in the research and development of SiC. It can withstand high voltage and high current and has been widely used in high-end products such as energy-saving variable frequency air conditioners.

2. Semiconductor field

SiC has also become one of the new key materials in the semiconductor field, and has been successfully applied in LED chips, solar panels and other fields. Silicon carbide can withstand high temperature and high pressure and has high electron mobility, making it superior to conventional materials and can be widely used in the semiconductor field.

3. Mechanical industry

SiC is widely used in the mechanical industry and can be used to manufacture mechanical parts with high hardness, high strength, high toughness, high wear resistance and high thermal conductivity. SiC ceramics have excellent thermal reversal life and mechanical strength, and are widely used in steel, chemical and other industries.

4. Other fields

In addition to the above three fields, SiC is also widely used in petrochemical, nuclear industry, disk manufacturing, aerospace and other fields. For example, silicon carbide needle valves can operate in harsh environments such as high temperature and high pressure, and have been widely used in the petrochemical industry.