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Basic Knowledge of Silicon Carbide

Release Time:

2013-01-26 16:22

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　　Silicon carbide includes black silicon carbide and green silicon carbide. Black silicon carbide is mainly made from quartz sand, petroleum coke, and high-quality silica, and is produced by high-temperature smelting in an electric resistance furnace. Its hardness lies between corundum and diamond, with mechanical strength higher than corundum, and it is brittle and sharp. Green silicon carbide is mainly made from petroleum coke and high-quality silica, with salt added as an additive, and is produced by high-temperature smelting in an electric resistance furnace. Its hardness lies between corundum and diamond, with mechanical strength higher than corundum.
　　
　　There are two common types of silicon carbide abrasives with different crystal forms. One is green silicon carbide, containing more than 97% SiC, mainly used for grinding hard alloy tools. The other is black silicon carbide, which has a metallic luster and contains more than 95% SiC. It has higher strength than green silicon carbide but lower hardness, mainly used for grinding cast iron and non-metallic materials.
　　
　　Applications:
　　
　　(1) As an abrasive, it can be used to make grinding tools such as grinding wheels, oil stones, grinding heads, and abrasive tiles.
　　
　　(2) As a metallurgical deoxidizer and high-temperature resistant material. Silicon carbide mainly has four major application fields: functional ceramics, advanced refractory materials, abrasives, and metallurgical raw materials. Currently, silicon carbide coarse materials can be supplied in large quantities and are not considered high-tech products, while the application of highly technical nano-scale silicon carbide powders cannot achieve economies of scale in the short term.
　　
　　(3) High-purity single crystals can be used to manufacture semiconductors and silicon carbide fibers.

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