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Controlling Nuclear Fission Boron carbide can absorb a large number of neutrons without forming any radioactive isotopes, making it an ideal neutron absorber in nuclear power plants. Neutron absorbers primarily serve to regulate the rate of nuclear fission. In nuclear reactors, boron carbide is typically fabricated into control rods; however, to increase surface area, it is sometimes processed into a powdered form. During the 1986 Chernobyl nuclear accident, a frontline aviation regiment stationed in Tuzhuk, Russia, was entirely redeployed east of Chernobyl. Helicopters ranging from Mi-8s to Mi-26s were immediately dispatched for airlift operations. Once the supply of boron carbide was exhausted, ordinary sand was substituted. As the dispersal progressed, flight operations became significantly easier. After helicopters had dropped nearly 2,000 tons of boron carbide and sand, engineers finally declared that the chain reaction inside the reactor had been halted. Ultimately, the total weight transported by helicopter reached 5,000 tons.[1] Abrasive Material Due to its hardness—exceeding that of silicon carbide or tungsten carbide—boron carbide has long been used as a coarse abrasive material. Although its high melting point makes it difficult to cast into artificial shapes, it can be processed into simple forms through high-temperature sintering of powdered material. It is employed for grinding, polishing, drilling, and finishing hard materials such as cemented carbides and gemstones. Coating Material Boron carbide can also serve as a ceramic coating for warships and helicopters, offering lightweight protection while resisting penetration by armor-piercing projectiles and providing a robust protective layer under thermal stress. Nozzles In the arms industry, boron carbide is utilized to manufacture gun nozzles. Extremely hard and wear-resistant, it does not react with acids or alkalis, withstands both high and low temperatures, and tolerates high pressures. Its density is ≥2.46 g/cm³, microhardness ≥3,500 kgf/mm², flexural strength ≥400 MPa, and melting point is 2,450°C. Owing to these superior properties of wear resistance and extreme hardness, boron carbide sandblasting nozzles are gradually replacing conventional nozzles made from cemented carbides, tungsten steel, silicon carbide, silicon nitride, alumina, zirconia, and other materials. Other Applications Boron carbide is also used in the production of metal borides, as well as in smelting processes involving sodium boride, boron alloys, and specialized welding techniques.

2018

Physicochemical Properties of Boron Carbide

It does not react with acidic or alkaline solutions and exhibits high chemical stability, neutron absorption, wear resistance, and semiconductor conductivity. It is one of the most acid‑stable materials, remaining stable in both concentrated and dilute aqueous solutions of acids and bases. After treatment with a mixed acid of sulfuric acid and hydrofluoric acid, followed by calcination in air at 800°C for 21 hours, it can be completely decomposed, yielding boron trioxide and diboron trioxide. When certain transition metals and their carbides are present together, it displays exceptional stability. At temperatures between 1000 and 1100°C, transition metals from Groups IV, V, and VI of the periodic table react vigorously with boron carbide powder to form metal borides. In the presence of nitric acid…

2018

Properties of boron carbide

Hard, black, lustrous crystals. Their hardness is lower than that of industrial diamond but higher than that of silicon carbide. They are less brittle than most ceramics. They possess a large thermal neutron capture cross section and exhibit excellent chemical resistance, remaining unaffected by hot hydrofluoric acid and nitric acid. They dissolve in molten alkalis but are insoluble in water and acids. The relative density (d204) is 2.508–2.512. The melting point is 2350°C, and the boiling point is 3500°C.

2018

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Mudanjiang Qianjin Boron Carbide Co., Ltd.

Phone:

0453-6380771

Email:

qjthp@126.com

Address:

No. 6, West of Bingxiang Road, Yangming District, Mudanjiang City, Heilongjiang Province

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