The Properties And Applications of Boron Carbide Powder
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Update time : 2021-06-17 15:26:56
Boron carbide, also known as black diamond, is an inorganic substance with a chemical formula of B₄C, usually gray-black micropowder. It is one of the three hardest materials known (after diamond and cubic boron nitride).
Boron Carbide Properties
Boron carbide does not react with acid and alkali solutions, and has high chemical potential, neutron absorption, wear resistance and semiconductor conductivity. Boron carbide is one of the most stable substances to acid and is stable in all concentrated or dilute acid or alkali aqueous solutions.
Boron carbide is basically stable below 800°C in an air environment. The boron oxide formed by its oxidation at a higher temperature is lost in the gas phase, leading to its instability and oxidation to form carbon dioxide and boron trioxide.
The Mohs hardness of boron carbide is about 9.5, which is the third hardest substance known after diamond and cubic boron nitride, and its hardness is higher than that of silicon carbide. Boron carbide has the characteristics of low density, high strength, high temperature stability and good chemical stability.
Boron Carbide Applications
Boron carbide is used in wear-resistant materials, ceramic reinforcing phases, especially in lightweight armor, reactor neutron absorbers, etc. Boron carbide is easy to manufacture and low in cost, so it is more widely used. It can replace expensive diamond in some places and is commonly used in grinding, grinding, drilling and other aspects.
Control nuclear fission
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 fission. Boron carbide is mainly made into a controllable rod shape in the nuclear reactor field, but sometimes it is made into a powder because of the increase in surface area.
Abrasive material
Due to the high melting point of boron carbide itself, it is not easy to cast into artificial products, but it can be processed into simple shapes by smelting the powder at high temperature. Used for grinding, grinding, drilling and polishing hard materials such as cemented carbide and gemstones.
Coating paint
Boron carbide can also be used as a ceramic coating for warships and helicopters. It is lightweight and has the ability to resist the penetration of armor-piercing projectiles through the hot-press coating to form an integral defense layer.
Nozzle
It can be used to make gun nozzles in the munitions industry. Because the boron carbide nozzle has the above characteristics of wear resistance and high hardness, the boron carbide sandblasting nozzle will gradually replace the known sandblasting nozzles of cemented carbide/tungsten steel and silicon carbide, silicon nitride, alumina, zirconia, etc.
Other
Boron carbide is also used in the manufacture of metal borides, smelting sodium boron, boron alloys, and special welding.
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