The properties and uses of boron carbide and its synthesis process

What is boron carbide
Boron carbide, also known as black diamond, is an organic substance with a molecular formula of B4C, usually gray-black micropowder. In the armor of vehicles, bullet-proof vests and many industrial applications. Its Mohs hardness is 9.3.
It was a by-product of metal boride research in the 19th century and was not scientifically studied until 1930.

Boron carbide can absorb a large number of neutrons without forming any resonant isotope, so it is an ideal neutron absorber in the nuclear power generation field, and the neutron absorber mainly controls the rate of nuclear fission. The field is mainly for casting controllable rods, but sometimes it is made into powder because of the need to increase.
Used in wear-resistant materials, ceramic reinforcing phases, especially lightweight armor, reactor neutron absorbers, etc. Therefore, unlike diamond and cubic nitrogen chemical borax, boron carbide is easy to manufacture and low in cost, so it is more widely used and can replace expensive diamond in some places. It is commonly used in grinding, grinding, milling and other aspects.
Uses of boron carbide
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 in the nuclear reactor field, but sometimes it is made into a powder because of the increase in surface area.
During the Chernobyl nuclear accident in 1986, Russia dropped nearly 2,000 tons of boron carbide and sand, which eventually stopped the chain reaction in the reactor.
Abrasive material
Because boron carbide has been used as a coarse abrasive material for a long time. Because of its high melting point, it is not easy to be 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 light in weight and has the ability to resist the penetration of armor-piercing projectiles through the hot-press coating to form an integral defense layer.
Nozzle
In the munitions industry, it can be used to make gun nozzles. Boron carbide, extremely hard and wear-resistant, does not react with acid and alkali, high/low temperature resistance, high pressure resistance, density ≥2.46g/cm3; microhardness ≥3500kgf/mm2, bending strength ≥400Mpa, melting point 2450℃.
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.
How to prepare boron carbide
Boron carbide was first reported in the Journal of the American Chemical Society. It was obtained by the reaction of coke and boron oxide in an electric furnace. This preparation method is also the method currently used in industrial production. 2B2O3+7C=B4C+6CO
Storage of boron carbide
Moist gatherings affect the dispersion performance and use effect of B4C powder. Therefore, boron carbide B4C powder should be sealed in a vacuum package and stored in a cool and dry room. Boron carbide B4C powder should not be exposed to the air. In addition, the use of boron carbide B4C powder under stress should be avoided.
Is B4C harder than diamond?
Boron carbide (chemical formula B4C) is an extremely hard ceramic material used in tank armor, bulletproof vests and many industrial applications. With a Mohs hardness of 9.3, it is one of the hardest materials known, second only to cubic boron nitride and diamond.
Boron carbide powder formed from monosaccharides and polysaccharides
Boron carbide powder is usually synthesized by carbothermal reduction or magnesium oxide reduction of boron oxygen compounds, and the carbon source is usually graphite or some organic phase. The purpose of this work is to use monosaccharides and polysaccharides to synthesize boron carbide powder, where the final particles are separated from each other by unreacted excess carbon, thereby preventing particle growth and the formation of strong aggregates. The aqueous solution of glucose, fructose, dextrin or hydroxyethyl starch and boric acid is dried, pyrolyzed at 850°C for 1 hour, and then heat-treated at a temperature of 1300 to 1700°C for 1 hour. The amount of boron carbide in the powder depends on the sugar and temperature. Particles prepared from precursors containing monosaccharides are elliptical, while when polysaccharides are used, they have a rhombohedral shape corresponding to the structure of boron carbide. This effect can be attributed to the presence of fused boron oxide.
About TRUNNANO
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years experience in providing super high-quality chemicals and B4C powder. As a leading nanotechnology development and powder manufacturer, Luoyang Tongrun dominates the market. Our professional work team provides perfect solutions to help improve the efficiency of various industries, create value, and easily cope with various challenges. If you are looking for B4C powder, please send an email to: sales1@nanotrun.com.
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