Metallic silicon: Also known as crystalline silicon or industrial silicon, the high-purity metallic silicon produced can reach a purity of 99.999 (5N). Silicon is a non-metallic element, blue-gray, metallic in color, hard and brittle. The content of silicon accounts for about 26% of the mass of the crust, the atomic mass is 28.09, the density is 2.34 g/cubic centimeter, the melting point is 1410°C, and the boiling point is 2355°C. The resistivity is 2140Ω. The commonly used grades of metallic silicon are usually classified according to the content of the three main impurities of iron, aluminum, and calcium contained in the metallic silicon component. Metal silicon can be divided into different grades such as 553 441 411 421 3303 3305 2202 2502 1501 1101.
The uses of metallic silicon include: producing silicone rubber, producing silicone resin, producing silicone oil, manufacturing high-purity semiconductors, and formulating alloys.
1. Silicone rubber: Silicone rubber has good elasticity and high temperature resistance. It is used to make medical supplies, high temperature resistant gaskets, etc.
2. Silicone resin: Silicone resin is used to produce insulating paint, high-temperature coatings, etc.
3. Silicone oil: Silicone oil is an oily substance whose viscosity is very little affected by temperature. It is used to produce high-grade lubricants, polishes, fluid springs, dielectric liquids, etc. It can also be processed into colorless and transparent liquids, as Advanced waterproofing agent is sprayed on the surface of the building.
4. Manufacturing high-purity semiconductors: Modern large-scale integrated circuits are almost all made of high-purity metallic silicon, and high-purity metallic silicon is also the main raw material for the production of optical fibers. It can be said that metallic silicon has become a basic pillar industry in the information age.
5. Preparation of alloys: Silicon-aluminum alloys are silicon alloys that are used in large quantities. Silicon-aluminum alloy is a strong composite deoxidizer. Replacing pure aluminum in the steelmaking process can improve the utilization rate of the deoxidizer, purify the molten steel, and improve the quality of the steel. Silicon-aluminum alloy has low density, low thermal expansion coefficient, good casting performance and anti-wear performance. Alloy castings cast with it have high impact resistance and good high-pressure densification, which can greatly increase the service life. It is commonly used in the production of aerospace vehicles. and auto parts.
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