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Boron carbide, also known as black diamond, has a molecular formula of B4C and is usually a gray black powder. It is one of the three hardest known materials (the other two are diamond and cubic boron nitride), used in tank armor, bulletproof vests, and many industrial applications. Its Mohs hardness is 9.3. 

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 neutron absorbers mainly control the rate of nuclear fission. Boron carbide is mainly made into controllable rods in nuclear reaction furnaces, but sometimes it is made into powder due to the need to increase surface area. Due to its low density, high strength, high temperature stability, and good chemical stability. Used in wear-resistant materials, ceramic reinforcement phases, especially in lightweight armor, reactor neutron absorbers, and other areas. In addition, compared to diamond and cubic boron nitride, boron carbide is easy to manufacture and has a lower cost, making it more widely used. In some places, expensive diamonds can be obtained, and it is commonly used in grinding, grinding, drilling, and other fields.

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 neutron absorbers mainly control the rate of nuclear fission. Boron carbide is mainly made into controllable rods in nuclear reaction furnaces, but sometimes it is made into powder due to the need to increase surface area.

During the Chernobyl nuclear accident in 1986, Russia dropped nearly 2000 tons of boron carbide and sand, ultimately stopping the chain reaction in the reactor.

Due to boron carbide being used as a coarse sand grinding material a long time ago. Due to its high melting point, it is not easy to cast into artificial products, but through high-temperature melting of powder, it can be processed into simple shapes. Used for grinding, grinding, drilling, and polishing of hard materials such as hard alloys and gemstones.

Boron carbide can also be used as a ceramic coating for warships and helicopters, which is lightweight and has the ability to resist penetration of armor piercing bullets through the hot pressed coating to form an overall protective layer.

In the arms industry, it can be used to manufacture gun nozzles. Boron carbide, extremely hard and wear-resistant, non reactive with acids and alkalis, resistant to high/low temperatures, high pressure, density ≥ 2.46g/cm3; Microhardness ≥ 3500kgf/mm2, bending strength ≥ 400Mpa, melting point 2450 ℃.

Due to the above wear-resistant and high hardness characteristics of boron carbide nozzles, boron carbide sandblasting nozzles will gradually replace known sandblasting nozzles made of hard alloy/tungsten steel, silicon carbide, silicon nitride, alumina, zirconia, and other materials.