Silicon metal (Si) is industrial purified silicon, mainly used in the production of organic silicon, semiconductor materials and high purity preparation of special purpose alloys.
(1)The first application of silicon metal
The production of silicone rubber, silicone resin, silicone oil and other silicone, silicone rubber has good elasticity, high temperature resistance, used for making medical supplies, high temperature resistance gaskets, etc. Silicone resin is used in the production of insulating paint, high temperature coating, etc. Silicone oil is an oily substance whose viscosity is little affected by temperature. It is used in the production of advanced lubricants, glazing agents, fluid springs, dielectric liquids, etc. It can also be processed into colorless and transparent liquids, which can be sprayed on the surface of buildings as senior waterproof agents.
(2)The second application of silicon metal
Manufacturing of high-purity semiconductor, modern large-scale integrated circuits are almost made of high-purity silicon metal, and high-purity silicon metal is the main raw material for the production of optical fiber. It can be said that silicon metal has become the basic pillar industry in the information age.
(3)The third application of silicon metal
preparation of alloy, silicon aluminum alloy is the largest amount of silicon alloy. Silicon aluminum alloy is a kind of strong composite deoxidizer, which can replace pure aluminum in the process of steelmaking to improve the utilization rate of deoxidizer, purify liquid steel and improve the quality of steel. Si-al alloy has low density, low thermal expansion coefficient, good casting performance and anti-wear performance. The alloy castings cast with si-al alloy have high impact resistance and good high pressure density, which can greatly improve the service life. It is commonly used to produce aerospace and automobile parts. Silicon copper alloy has good welding performance and is not easy to produce sparks when impacted. It has explosion-proof function and can be used to make storage tanks. Adding silicon into steel to make silicon steel sheet can greatly improve the magnetic conductivity of steel, reduce hysteresis and eddy current loss, which can be used to manufacture iron core of transformer and motor and improve the performance of transformer and motor.
Silicon metal (also known as industrial silicon in China) is a commodity name in the mid-1960s. Its emergence is related to the rise of the semiconductor industry. At present, the international general practice is to divide the commercial silicon into silicon metal and silicon semiconductor. Silicon metal is a product smelted by quartz and coke in the electric heating furnace. The content of silicon element is about 98% (in recent years, 99.99% Si content is also famous in silicon metal), and the other impurities are iron, aluminum, calcium and so on. Semiconductor silicon A high-purity metallic silicon used in semiconductor devices. It is sold in the form of polycrystal and single crystal. The former is cheap and the latter is expensive. Because of its different uses and divided into a variety of specifications. According to statistics, in 1985 the world consumed about 500 thousand tons of silicon metal, which used for aluminum alloy about 60%, less than 30% for organic silicon, used for semiconductor about 3%, the rest used for iron and steel smelting and precision ceramics. The properties of silicon.
