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What is Boron carbide?

What is Boron carbide?
Boron carbide, also known as Black Diamond, is an inorganic form. The chemical form is B₄C. It is one of the three hardest materials known (after diamond and cubic boron nitride) and is used in tank armor, bullet-proof clothing and many industrial applications. It has a Mohs hardness of about 9.5. It was discovered in the 19th century as a by-product of research on metal borides and was not studied scientifically until the 1930s. Boron carbide can be prepared by reducing boron trioxide with carbon in an electric furnace.
Boron carbide performance
Boron carbide does not react with acid and alkali solutions and it has high chemical potential, neutron absorption, wear resistance and semiconductor conductivity. It is one of the most stable substances to acids and is stable in all concentrated or dilute solutions of acid or alkaline water. Boron carbide is stable under 800℃ in the air environment, due to the higher temperature of the oxidation of boron oxide in the gas phase loss, resulting in its instability, oxidation to form carbon dioxide and boron trioxide.
When some transition metals and their carbides coexist, they have special stability. The transition metals ⅳ,ⅴ, and ⅵ in the periodic table react strongly with boron carbide powder to form metal borides at 1000 ~ 1100℃. However, at higher reaction temperatures, it has been reported that boron carbide tends to nitride or react with transition metal oxides to form corresponding boron nitride and borides, which are mainly rare earth and alkaline earth metal hexaborides.
Boron carbide application 
1. Controlled nuclear fission
Boron carbide can absorb large amounts of neutrons without forming any radioactive isotopes, making it an ideal neutron absorber for nuclear power plants, where neutron absorbers control the rate of nuclear fission.
2. Abrasive materials
Because boron carbide has a high melting point, it is not easy to cast into artifacts, but by melting the powder at high temperatures, it can be machined into simple shapes. It can be used for grinding, grinding, drilling and polishing hard materials such as hard alloy and precious stone.
3. Coating paint
Boron carbide can also be used as a ceramic coating for warships and helicopters. It is lightweight and can resist armor-piercing bullets penetrating the hot-pressed coating as a whole.
4. The nozzle
Because boron carbide nozzle has the characteristics of wear resistance and high hardness, boron carbide sandblasting nozzle will gradually replace the known carbide/tungsten steel and silicon carbide, silicon nitride, alumina, zirconia and other materials of the sandblasting nozzle.
5. Other application
Boron carbide is also used in the manufacture of metal borides and smelting of sodium boron, boron alloys and special welding
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