Processing technology market development of silicon micropowder

Silicon powder is a kind of inorganic material with excellent dielectric properties, low thermal expansion coefficient, low thermal conductivity, corrosion resistance rich resources. The excellent physical properties, high chemical stability unique optical properties of silicon powder determine its special position in the field of high-tech, silicon powder has become the most basic, the most important the most critical raw material in many high-tech fields.

China is facing a digitalized, networked informationized society. The world is undergoing profound changes in politics, economy, science technology, culture military. The government academic circles agree that innovation is the main driving force of national economic development in the era of knowledge economy, scientific technological innovation is the most important foundation of innovation. Because new materials play an important role in developing high technology, transforming upgrading traditional industries, enhancing comprehensive national strength national defense strength, developed countries all attach great importance to its research development industrialization. With the rapid development of high new technology, especially microelectronics industry, the demand for high purity, ultra-fine spherical silicon powder has increased, its annual average growth rate has exceeded 20%. In the 21st century, China's silicon powder industry is faced with the arduous task of improving the technical structure, improving the overall level of technology equipment, realizing the localization of high-tech silicon powder for electronic information other innovative technology industries.

According to the structure, it can be divided into crystalline molten silicon micropowder, according to the shape, it can be divided into angular spherical silicon micropowder.

Crystalline silicon powder is made of natural quartz stone. Because of its irregular shape, it is also called angular crystalline silicon powder. Crystalline silicon powder includes ordinary type non ordinary type, the main difference lies in the purity requirement.

Molten silicon powder is also known as amorphous amorphous silicon powder. One is made of refined quartz sand as raw material by high-temperature melting (1740℃) other processes; The second is silicide (organic silicon, silicon tetrachloride, alkali metal silicate), prepared by chemical synthesis method.

According to the application field of silicon micropowder, it can be divided into: Common silicon powder (PG), common active silicon powder (PGH), electrical grade silicon powder (DG), electrical grade active silicon powder (DGH), electronic grade crystalline silicon powder (JG), electronic grade crystalline active silicon powder (JGH), electronic grade molten silicon powder (RG) electronic grade molten active silicon powder (RGH).

Spherical silicon powder is mainly used in the production of large scale integrated circuits, optoelectronic engineering, chemical engineering other fields.

Because the spherical silicon powder has good fluidity, the resin is stirred into a film evenly, the resin is added in a small amount, the weight ratio can reach 90.5%. The higher the filling rate of silicon powder is, the closer it is to the thermal expansion coefficient of monocrystalline silicon, the quality of electronic components produced is also better. The epoxy resin made of spherical silicon powder has the advantages of low stress high strength, high yield less mechanical damage when used to encapsulate integrated circuit chips. At the same time, the friction coefficient of spherical silicon powder is small, the service life of the mold can be extended twice.

Nano-sio2 powder has many strange properties, such as small size effect, surface interface effect, quantum size effect macroscopic quantum tunneling effect. In its use process shows excellent reinforcement, toughness, thixotropy, extinction, dispersion, high dielectric insulation high gloss, etc., is widely used in various fields of modern industry.