Boron carbide, also known as black diamond, has a molecular formula of B4C, usually a grayish black powder. It is one of the three hardest materials known (the other two are diamond and cubic boron nitride) and is used in tank armor, body armor and many industrial applications. Its Mohs hardness is 9.3.
Because of its low density, high strength, high temperature stability and good chemical stability. Used in wear-resistant materials, ceramic reinforced phases, especially in light armor, reactor neutron absorbers, etc. In addition, compared with diamond and cubic boron nitride, boron carbide is easier to manufacture and cheaper, so it is more widely used. In some places, it can replace expensive diamonds, and is commonly used in grinding, grinding, drilling and other applications.
The application of boron carbide 1.Control nuclear fission
Boron carbide can absorb a large amount of neutrons without forming any radioisotopes, so it is an ideal neutron absorber in nuclear power plants, and neutron absorbers mainly control the rate of nuclear fission. Boron carbide is mainly made into a controllable rod shape in the nuclear reactor yard, but sometimes it is made into powder because of the increased surface area.
When the Chernobyl nuclear accident occurred in 1986, Russia dropped nearly 2,000 tons of boron carbide and sand, and finally stopped the chain reaction in the reactor.
2.Abrasive material
Since boron carbide was used as a coarse abrasive material a long time ago. Due to its high melting point, it is not easy to cast into artificial products, but by melting the powder at high temperature, it can be processed into a simple shape. Used for grinding, grinding, drilling and polishing of hard materials such as cemented carbide and precious stones.
3.Coating
Boron carbide can also be used as a ceramic coating for warships and helicopters. It is lightweight and has the ability to resist armor-piercing projectiles from penetrating the hot-pressed coating into an overall defense layer.
4.nozzle
It can be used as a gun nozzle in the arms industry. Boron carbide is extremely hard and wear-resistant, does not react with acid and alkali, resistant to high / low temperature, high pressure, density ≥2.46g / cm3; microhardness ≥3500kgf / mm2, bending strength ≥400Mpa, melting point 2450 ℃
Because the boron carbide nozzle has the above characteristics of high wear resistance and high hardness, the boron carbide sandblasting nozzle will gradually replace the known cemented carbide / tungsten steel and silicon carbide, silicon nitride, aluminum oxide, zirconium oxide and other materials sandblasting nozzles .
5.other
Boron carbide is also used in the manufacture of metal borides and smelting sodium boron, boron alloys and special welding.
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