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Basic properties of silicon carbide
May 21, 2018

1. Chemical properties

Oxidation resistance: When the silicon carbide material is heated to 1300°C in air, a silica protective layer starts to form on the surface of its silicon carbide crystal. With the thickening of the protective layer, internal silicon carbide is prevented from being continuously oxidized, which makes silicon carbide have better oxidation resistance. When the temperature reaches 1900K (1627°C) or more, the silica protective film begins to be destroyed and the oxidation of silicon carbide is intensified. Therefore, 1900K is the highest working temperature of silicon carbide in an oxidant-containing atmosphere.

Acid and alkali resistance: In terms of resistance to acids, alkalis, and oxides, due to the silica protective layer, silicon carbide has a strong acid resistance and is slightly less resistant to alkalis.

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2. Physical and mechanical properties

Density: The density of various silicon carbide crystal grains is very close, generally considered to be 3.20g/mm3. The natural bulk density of silicon carbide abrasives is between 1.2-1.6g/mm3, depending on the grain size, particle size composition and granules. shape.

Hardness: Silicon carbide has a Mohs hardness of 9.2, a Vickers microhardness of 3000-3300 kg/mm2, and a Knoop hardness of 2670-2815 kg/mm. It is higher than corundum and second only to diamond, cubic boron nitride, and carbonization. boron.

Thermal conductivity: Silicon carbide products have high thermal conductivity, low coefficient of thermal expansion, and high thermal shock resistance. They are high-quality refractory materials.

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3. Electrical properties

Industrial silicon carbide at room temperature is a kind of semiconductor, which is conductive to impurities. With the increase of temperature, the high-purity silicon carbide has a lower resistivity. The impurity-containing silicon carbide has different conductivity and different electrical conductivity. Another electrical property of silicon carbide is electroluminescence, and the use of equipment has now been developed.

4. Other properties

Good hydrophilicity, far infrared radiation and so on.


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