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    Properties And Uses of Boron Carbide
    Hits:   Date:2020-07-08  
    Boron carbide is black crystal with metallic luster, commonly known as black diamond. It is a powdered product that is made of boric acid as the main raw material and added with carbonaceous materials such as petroleum coke, after high-temperature solid-state smelting and crushing. Boron is also a superhard material.

    Boron carbide is insoluble in water and organic solvents, has strong chemical stability, is resistant to acid and alkali corrosion, and hardly reacts with all acid and alkali solutions. Boron carbide also has the following characteristics: it has a large thermal neutron capture cross-section and strong neutron absorption capacity, so it is known as a neutron absorber; it has semiconductor properties.
    Properties and uses of boron carbide

    Boron carbide (B4C) is gray-black and is a very hard man-made material with a Mohs hardness of 9.3 and a microhardness of 5500-6700 kg/mm2, second only to diamond and cubic boron nitride. The crystal structure of boron carbide is hexagonal crystal. The density is 2.52g/cm3. Melting point is 2450℃, when the temperature is higher than 2800℃, it will decompose and volatilize rapidly. Boron carbide is resistant to acid and alkali corrosion and does not wet with most molten metals and has a very high chemical stability. Boron carbide can resist the oxidation of air at 1000℃, but it is easily oxidized at above 900℃ in an oxidizing atmosphere. Boron carbide powder has a very high grinding capacity, exceeding the grinding capacity of silicon carbide by 50%, 1 to 2 times higher than the grinding capacity of corundum, and is an excellent grinding material and wear-resistant material.

    The biggest use of boron carbide is as an abrasive and raw material for making abrasive tools. It is suitable for the grinding, polishing and drilling of various carbide tools, molds, parts, components and gemstones. With proper amount of engine oil or water as lubricant, boron carbide can be made into grinding paste and polishing paste. Boron carbide can also be used as a raw material for the production of metal borides, boron alloys, boron steel, etc. In addition, in special occasions, it can be used to manufacture boron carbide hot-pressed products as wear-resistant and high-temperature resistant parts, such as nozzles, sealing rings, gyroscopes, petrochemical parts, and lightweight high-strength parts in military engineering and Control rod for atomic reactor.