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Boron carbide, also known as black diamond, is an inorganic substance with a chemical formula of B, C, usually a gray-black micropowder. It is one of the three materials known to be hard (second only to diamond and cubic boron nitride) and is used in tank armor, body armor and many industrial applications. Its Mohs hardness is about 9.5.
It was discovered in the 19th century as a by-product of metal boride research and was not scientifically studied until the 1930 s. Boron carbide can be produced by reducing boron trioxide with carbon in an electric furnace.
Boron carbide can absorb a large number of neutrons without forming any radioactive isotopes, so it is an ideal neutron absorber in nuclear power plants, and the neutron absorber mainly controls the rate of nuclear division. Boron carbide is mainly made into a controllable rod in the nuclear reactor field, but sometimes it is made into powder because of the need to increase the surface area.
Because of its low density, high strength, high temperature stability and good chemical stability. It is used in wear-resistant materials, ceramic reinforcement phase, especially in light armor, reactor neutron absorber, etc. In addition, compared with diamond and cubic boron nitride, boron carbide is easy to manufacture, low cost, and therefore more widely used, in some places can replace expensive diamond, common in grinding, grinding, drilling and other applications.
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