China Factory Supply High Purity Silicon Metal 553 And 441

Crystalline silicon is dark blue, very brittle, and is a typical semiconductor. Chemical properties are very stable. At room temperature, it is difficult to react with other substances except hydrogen fluoride.

①High-purity single crystal silicon is an important semiconductor material

Doping a small amount of group IIIA elements into single crystal silicon to form a p-type silicon semiconductor; doping a small amount of group VA elements to form n-type and p-type semiconductors combined together, can be made into solar cells, the radiation energy converted into electricity. It is a promising material in the development of energy.

②Cermets, important materials for space navigation

The ceramic and metal are mixed and sintered to make a metal-ceramic composite material, which is resistant to high temperature, rich in toughness, and can be cut. It not only inherits the respective advantages of metal and ceramics, but also makes up for the congenital defects of both. Can be used in the manufacture of military weapons The first space shuttle "Columbia" can withstand the high temperature caused by friction when traversing the dense atmosphere at high speed, thanks to its shell made of 31,000 silicon tiles.

③ Optical fiber communication, the latest modern means of communication

The high-transparency glass fiber is drawn from pure silica, and the laser is transmitted forward through numerous total reflections in the path of the glass fiber, replacing the bulky cable. The optical fiber has high communication capacity. A glass fiber as thin as a human hair can transmit 256 telephone calls at the same time. It is also free from electrical and magnetic interference, not afraid of eavesdropping, and has a high degree of confidentiality. Optical fiber communication will revolutionize human life in the 21st century.

④Silicon organic compound with excellent performance

Silicone plastics, for example, are excellent waterproof coating materials. Spraying silicone on the four walls of the subway can solve the problem of water seepage once and for all. On the surface of ancient cultural relics and sculptures, a thin layer of silicone plastic can be applied to prevent moss from growing and resist wind, rain and weathering. The Monument to the People's Heroes on Tiananmen Square is treated with silicone plastic, so it will always be white and fresh.

The classification of metal silicon is usually classified according to the content of three main impurities of iron, aluminum and calcium contained in the metal silicon component. According to the content of iron, aluminum and calcium in metal silicon, metal silicon can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101 and other different grades.

Industrially, metallic silicon is usually prepared by reducing silica with carbon in an electric furnace. Chemical reaction equation: SiO2 + 2C → Si + 2CO The purity of silicon obtained in this way is 97~98%, which is called metal silicon. It is then melted and recrystallized, and impurities are removed with acid to obtain metallic silicon with a purity of 99.7~99.8%.

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