What are the characteristics and application fields of spherical silica powder
Spherical silica powder is a white powder with high purity, very fine particles, good dielectric properties and thermal conductivity, and has the advantage of low expansion coefficient, and has strong development potential. Spherical silicon is also called spherical silicon powder, etc. in the industry. When spherical silicon powder is used in current integrated circuits, the purity requirements become more and more stringent. Under normal circumstances, the silicon content cannot be lower than 99.95%.
Characteristics and performance of spherical silica powder products
Nano spherical silicon is spherical crystalline silicon particles with high sphericity and high roundness. It has the characteristics of high purity, small particle size, uniform distribution, large specific surface area, high fluidity, high insulation, high surface activity and low bulk density. Spherical silicon is non-toxic, odorless, and has good activity. It is a new generation of optoelectronic semiconductor material with a wide gap energy semiconductor, and it is also a high-power light source material. Spherical silicon has excellent properties such as high dielectric constant, high heat resistance, high humidity resistance, high filling content, low expansion, low stress, low impurities and low coefficient of friction.
The main application areas of spherical silica
Spherical silica is widely used in aviation, aerospace, semiconductors, electronic components and other materials.
It can be added as a filler together with phenolic epoxy resin, adhesives, coatings, advanced ceramics, coatings, rubber, and silica gel to reduce costs, improve weather resistance, hardness, etc.
Spherical silica can be added to products such as adhesives, catalysts, pharmaceuticals, castings and packaging materials.
Spherical silica has a low thermal shrinkage rate. Adding to PVC, PP, PE and other plastic products will not affect the color and feel, reduce heat shrinkage and prevent warping.
Storage conditions of nano spherical silicon
Nano spherical silicon (spherical silica) should be sealed and stored in a dry and cool environment. It should not be exposed to the air for a long time to prevent agglomeration due to moisture and affect the dispersion performance and use effect. In addition, avoid heavy pressure and avoid contact with oxidants. But because it is non-toxic, it can be transported as ordinary cargo during transportation. Nano spherical silica is packed in white woven bags and paper drums, with PVC moisture-proof inner membrane and waterproof outer layer.
How to prepare spherical silica
The production methods of spherical silica include flame ball method, high temperature melt blow method, gas phase method, gel method, a spray method, emulsion method, precipitation method and other production methods. Product performance and application range are different.
At present, the methods for preparing spherical silica powder mainly include chemical preparation methods, such as chemical vapor method, chemical precipitation method, high-frequency plasma method, high temperature melting spray method and sol-gel method.
Observing the microstructure of spherical silica can summarize the spherical mechanism of spherical silica fume, which can guide spherical silica fume manufacturers to improve production processes and product quality.