carbide


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carbide,

any one of a group of compounds that contain carbon and one other element that is either a metal, boron, or silicon. Generally, a carbide is prepared by heating a metal, metal oxide, or metal hydride with carbon or a carbon compound. Calcium carbide, CaC2, can be made by heating calcium oxide and coke in an electric furnace; it reacts with water to yield acetylene and is an important source of the gas. Barium carbide reacts similarly. Aluminum carbide reacts with water to yield methane. Some carbides are unaffected by water, e.g., chromium carbide and silicon carbidesilicon carbide,
chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under such familiar trade names as Carborundum and Crystolon.
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. Silicon carbide, almost as hard as diamond, is used as an abrasive. Tungsten carbide, also very hard, is used for cutting edges of machine tools. Iron carbides are present in steel, cast iron, and some other iron alloys.

carbide

[′kär‚bīd]
(inorganic chemistry)
A binary compound of carbon with an element more electropositive than carbon; carbon-hydrogen compounds are excluded.
(materials)
A cemented or compacted mixture of powdered carbides of heavy metals forming a hard material used in metal-cutting tools. Also known as cemented carbide.

carbide

1. a binary compound of carbon with a more electropositive element
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In spite of some opportunities brought by the upgrading of product structure and the extension of downstream demand, the development of silicon carbide industry, which is featured by high energy consumption and pollution, is exposed to hindrance from the influence of energy shortage and national energy conservation policy, in specific, the examination and approval of new projects are restricted, and relevant preferential policies like low electricity price have already been cancelled.
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