Yuan Lei's Little Knowledge | Understanding the Types of Silica Powder from Different Angles
Silicon powder is made of natural quartz (SiO2) or fused quartz (natural quartz by high temperature melting, cooling after amorphous SiO2) by crushing, ball milling (or vibration, air flow grinding), flotation, pickling purification, high purity water treatment and other multi-channel processing of micro powder. There are different types of silicon powder according to different classification methods. Let's take a look at the classification of silicon powder.
By production process
① Fused silica powder:It is a powder formed by selecting high quality natural quartz as raw material and processing through unique processing technology.
② Crystalline silicon powder:It is made of high-grade natural quartz as raw material and processed through a unique iron-free grinding process.
③ active silicon powder:It is through its unique process, the selection of silane and other materials to the surface modification of silicon powder particles.
④ Cristobalite silica powder:Is the selection of high quality natural quartz as raw material, high purity silica obtained by high temperature calcination, by quenching to change its crystal structure, and then crushed made of silicon powder, its main crystal phase is cristobalite.
Divided from the appearance
From the appearance of silicon powder can be divided into angular silicon powder and spherical silicon powder. The "spherical" silica powder is a high-strength, high-hardness, inert spherical particle with high-quality quartz ore and processed by a unique process, and its main component SiO2 content is more than 99.6%.
Divided by high-tech silicon powder
① Superfine silica powder:It is based on high purity natural quartz as raw material, through artificial selection, cleaning and purification, and then by superfine grinding and grading technology, to produce SiO2 powder series products. The use of advanced classification technology to achieve ultrafine particle diameter and uniform distribution characteristics, fineness of up to 8000 mesh, so that it has more reinforcement and processing fluidity.
② Spherical silica powder:Because of its good fluidity, small surface area, high bulk density, the filling amount can reach a higher filling amount, and the resin is stirred to form a uniform film. Spherical silicon powder is mainly used for large-scale integrated circuit packaging. When the integrated circuit chip is packaged by the spherical silicon micropowder plastic packaging material, the yield is high, and the mechanical damage is not easy to occur during transportation and use.
③ high purity silica powder:Generally refers to the SiO2 content is higher than 99.9 of quartz powder, mainly used in IC integrated circuits and quartz glass and other industries, its high-end products are widely used in large-scale and ultra-large-scale integrated circuits, optical fiber, laser, aerospace, military, high-tech industries indispensable important materials.
By integrated circuit copper clad laminate
The silicon micropowder used in integrated circuit copper clad laminates can be divided into five varieties: crystalline silicon micropowder, molten (amorphous) silicon micropowder, spherical silicon micropowder, composite silicon micropowder, and active silicon micropowder.
Species, silica fume, quartz, natural, sio2, processing, spherical, unique, process, division
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.