1，Silicon powder classification - according to the production process
Can be divided into: crystalline silicon micro powder, molten silicon micro powder, quartz quartz micro powder, active silicon micro powder.
①. Crystalline silicon powder
Crystalline silicon powder is made of high grade natural quartz through unique iron free grinding process. It is white in color and pure in quality.The process is mature and has stable physical and chemical characteristics and reasonable and controllable particle size distribution.Crystalline silicon micro powder can be divided into high purity crystalline silicon micro powder, electronic grade crystalline silicon micro powder and general packing grade crystalline silicon micro powder.
②, Fused silicon powder
Fused silica powder is selected from high quality natural quartz and processed by unique processing technology. Through high temperature treatment, its molecular structure is changed from ordered arrangement to disordered arrangement.Its color is white, high purity and has the following characteristics: very low linear expansion coefficient;Good electromagnetic radiation;Stable chemical properties such as chemical corrosion resistance;Reasonable, orderly and controllable particle size distribution.Molten silicon powder is widely used.
Cristobalite silica powder is a kind of powder which is made by using high quality natural quartz and special process.The high purity silica obtained by high temperature calcining can be stabilized and changed through rapid cooling. Due to its stable chemical properties, reasonable, orderly and controllable particle size distribution, it is widely used.
④. Active silicon powder
Through its unique process, the surface of silicon micro powder is modified by silane and other materials, which enhances the hydrophobic properties of silicon micro powder and improves the mechanical, electronic and chemical characteristics of the mixing material and filling system.The surface treatment of silicon powder particles is mainly to improve the performance of the filling system.
It is mainly used in epoxy resin castable material, sealing material, protective layer of welding rod, metal casting, ceramic, silicon rubber, coating and other chemical industry.
②. Electrician grade silicon powder
Mainly used for insulation pouring of ordinary electrical parts, insulation pouring of high voltage electrical appliances, APG process injection material, epoxy sealing material, high-grade ceramic glaze and so on.
③. Electronic grade silicon powder
Main applications: mainly used in integrated circuits, electronic components of plastic and packaging materials.
④, molten silicon powder
The raw material of molten quartz micro powder (WG) is the amorphous SiO2 of natural quartz after high temperature melting and cooling, and the micro powder is processed by multiple processes.The product has high purity, low thermal expansion coefficient, low internal stress, high moisture resistance, low radioactivity and other excellent characteristics.
It is mainly used in plastic sealing material, epoxy pouring material, pouring material and other chemical fields.
⑤. Ultrafine silicon powder
Mainly used in coatings, paints, engineering plastics, adhesives, kui rubber, precision casting advanced ceramics.