Ceramics (Silicon carbide powder)

Silicon carbide ceramic powder is the core raw material for preparing high-performance silicon carbide ceramics, and its properties directly affect the quality of the final ceramic products. The following is a summary of key information:
1. Basic characteristics
High purity requirement: The purity of semiconductor grade silicon carbide powder needs to be above 99.99%, and the impurity content directly affects the thermal conductivity and electrical properties of the ceramic.
Crystal structure and particle size: Common alpha phase (hexagonal) and beta phase (cubic), nanoscale powders (such as 500nm) are suitable for high-precision ceramic preparation, while micrometer scale powders (such as GC1500 #) are mostly used for industrial wear-resistant components.
2. Preparation technology
Traditional purification method: removing metal impurities through acid and alkali washing, which is low-cost but difficult to achieve sub micron level fine powder.
 Chemical synthesis method: such as vapor deposition method, which can precisely control the particle size and purity, is suitable for nano powder, but the cost is high.
Composite process: Combining mechanical crushing with chemical modification (such as wet grinding+surface coating), balancing quality and mass production requirements.
3. Application Fields
Electronic heat dissipation: High thermal conductivity powder (thermal conductivity 120-200 W/m · K) is used for chip heat dissipation substrates, and Huawei patents use it as a thermal conductive filler to improve heat dissipation efficiency.
New energy and aerospace: used for bearings in electric drive systems of new energy vehicles and components of rocket engines, with outstanding high temperature resistance (melting point>2700 ℃) and corrosion resistance.
Precision manufacturing: Nano silicon carbide powder enhances the hardness of ceramic cutting tools, with a lifespan 5-10 times that of traditional cutting tools.