Metallic Silicon Definition "Metallic Silicon" (also known as industrial silicon in China) is a trade name that appeared in the mid-1960s.Metallic silicon is divided into various specifications depending on its use. According to statistics, in 1985, the world consumed about 500,000...Send Inquiry
Metallic Silicon Definition
"Metallic Silicon" (also known as industrial silicon in China) is a trade name that appeared in the mid-1960s.Metallic silicon is divided into various specifications depending on its use. According to statistics, in 1985, the world consumed about 500,000 tons of metal silicon, of which metal silicon for aluminum alloys accounted for about 60%, less than 30% for silicones, and about 3% for semiconductors. Iron and steel smelting and precision ceramics.
Atomic structure of Metallic Silicon
Electron arrangement outside the nucleus: 1s22s22p6 3s23p2;
Unit cell type: cubic diamond type;
Unit cell parameters: measured at 20 ° C, its unit cell parameter a = 0.543087 nm;
Color and appearance: dark gray, with blue tones;
The single crystal silicon (100) has an E of 140 to 150 GPa as measured by nanoindentation;
Conductivity: The electrical conductivity of silicon has a great relationship with its temperature. As the temperature increases, the electrical conductivity increases, reaching a maximum at around 1480 °C, and decreases with increasing temperature after the temperature exceeds 1600 °C  .
Metallic silicon classification
The classification of metallic silicon is usually classified according to the content of three main impurities of iron, aluminum and calcium contained in the metallic silicon component. According to the content of iron, aluminum and calcium in the metal silicon, the metal silicon can be divided into different grades such as 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501 and 1101.
Industrially, metal silicon is usually produced by reducing silicon dioxide from carbon in an electric furnace. Chemical reaction equation: SiO2 + 2C → Si + 2CO The purity of the silicon obtained is 97~98%, called metal silicon. Further, it was melted, recrystallized, and the impurities were removed with an acid to obtain metal silicon having a purity of 99.7 to 99.8%.
The metal silicon component is mainly silicon and thus has similar properties to silicon. Silicon has two allotropes of amorphous silicon and crystalline silicon. Amorphous silicon is a gray-black powder and is actually a microcrystal. Crystalline silicon has the crystal structure and semiconductor properties of diamond, melting point 1410 ° C, boiling point 2355 ° C, Mohs hardness 7, brittleness. Amorphous silicon is chemically active and can burn intensely in oxygen. It reacts with non-metals such as halogen, nitrogen and carbon at high temperatures, and also reacts with metals such as magnesium, calcium and iron to form silicides. Amorphous silicon is hardly soluble in all inorganic and organic acids including hydrofluoric acid, but is soluble in a mixed acid of nitric acid and hydrofluoric acid. The concentrated sodium hydroxide solution dissolves amorphous silicon and releases hydrogen. Crystalline silicon is relatively inactive, does not combine with oxygen even at high temperatures, it is not soluble in any one of inorganic and organic acids, but is soluble in mixed acid of nitric acid and hydrofluoric acid and concentrated sodium hydroxide solution.
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