News Updates-Mudanjiang Qianjin Boron Carbide Co., Ltd.

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—precisely because neutron absorbers are crucial for regulating the rate of nuclear fission. In nuclear reactors, boron carbide is typically fabricated into controllable rod-shaped forms; however, to maximize surface area for enhanced absorption efficiency, it’s sometimes processed into a powdered form. During the 1986 Chernobyl nuclear disaster, a frontline aviation regiment stationed in Tuzhuk, Russia, was fully mobilized and dispatched eastward toward Chernobyl. Helicopters ranging from Mi-8 to Mi-26 models were immediately deployed to carry out aerial delivery missions. As the supply of boron carbide dwindled, conventional sand was reintroduced to the operation. Fortunately, as the sand dispersal progressed, flight operations became significantly easier. After helicopters had dropped nearly 2,000 tons of boron carbide mixed with sand, engineers finally confirmed that the chain reaction inside the reactor had been successfully halted. By the end of the mission, the total weight delivered by helicopters reached an impressive 5,000 tons.[1] Abrasive Material Due to its exceptional hardness—surpassing even silicon carbide or tungsten carbide—boron carbide has long been utilized as a coarse abrasive material. Although its high melting point makes it challenging to cast into intricate shapes, boron carbide can be shaped into simple forms through high-temperature powder metallurgy processes. It is widely employed for grinding, polishing, drilling, and cutting hard materials such as cemented carbides and precious gems. Coating Applications Boron carbide also serves as a versatile ceramic coating for military vessels and helicopters, offering lightweight protection while effectively resisting armor-piercing projectiles and providing robust thermal insulation against heat penetration. This unique combination of lightweight properties and superior protective capabilities makes it an invaluable material for enhancing the durability and performance of naval and airborne platforms. Nozzle Manufacturing In the defense industry, boron carbide is prized for crafting high-performance nozzles used in firearms and artillery systems. Its extraordinary hardness, unmatched wear resistance, and chemical inertness—combined with its ability to withstand extreme temperatures and pressures—make it an ideal choice for applications where durability and precision are paramount. With a density exceeding 2.46 g/cm³ and a microhardness surpassing 3,500 kgf/mm², boron carbide nozzles exhibit exceptional resistance to abrasion and wear. Moreover, they maintain structural integrity under both high and low temperatures, as well as at elevated pressures. Given these outstanding characteristics, boron carbide nozzles are poised to gradually replace traditional abrasive tools made from materials like cemented carbides, tungsten steel, silicon carbide, silicon nitride, alumina, and zirconia. Other Applications Beyond its use in abrasives and coatings, boron carbide plays a vital role in the production of metal borides. It is also essential in refining sodium borates, manufacturing boron alloys, and supporting specialized welding techniques.

2018

The physicochemical properties of boron carbide

It does not react with acids or alkaline solutions and exhibits high chemical stability, excellent neutron absorption properties, outstanding wear resistance, and semiconductor-like conductivity. It is one of the most acid-resistant materials, remaining stable even in highly concentrated or dilute acidic or basic aqueous solutions. When treated with a mixed acid solution of sulfuric acid and hydrofluoric acid, followed by calcination in air at 800°C for 21 hours, it completely decomposes, yielding carbon dioxide and boron trioxide as final products. Moreover, when certain transition metals and their carbides coexist, the material demonstrates remarkable stability. At temperatures between 1000°C and 1100°C, transition metals from Groups IV, V, and VI of the periodic table react vigorously with boron carbide powder, forming metallic borides. This reaction is particularly pronounced in the presence of nitric acid.

2018

Properties of boron carbide

Hard, black, and lustrous crystal. Its hardness is lower than that of industrial-grade diamond but higher than silicon carbide. Compared to most ceramics, it exhibits relatively low brittleness. It possesses a large thermal neutron capture cross-section and demonstrates exceptional resistance to chemical attack. It is unaffected by hot hydrofluoric acid or nitric acid yet dissolves readily in molten alkalis—though it remains insoluble in water and common acids. Its relative density (d204) ranges from 2.508 to 2.512, with a melting point of 2350°C and a boiling point of 3500°C.

2018

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Mudanjiang Qianjin Boron Carbide Co., Ltd.

Phone:

0453-6380771

Email:

qjthp@126.com

Address:

No. 6, Xili Refrigerator Road, Yangming District, Mudanjiang City, Heilongjiang Province

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