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Boron carbide has been widely used as a new material with excellent mechanical properties, irradiation self-resettable properties and neutron absorption ability. Since the first successful synthesis of boron carbide in the early 20th century, in the past 100 years, with the development of technology, the synthesis technology of boron carbide has not only been limited to the original element synthesis method, but also with the selection of raw materials, sintering process, reaction time and other technologies, the preparation methods of boron carbide powder have been diverse.

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    However, because of its own high covalent bond content (more than 90%), the thermodynamic and kinetic conditions of the process are complex, it is difficult to get a high purity, small particle size and uniform boron carbide powder, the following are several process methods that can prepare better quality boron carbide powder.

    Title I Physical properties of boron carbide:

    The density of boron carbide is close to 2.52 g/cm³.

    • The melting point of boron carbide is 2445 °C.

    • Boron carbide hardness ranges from 2900 to 3580Kg/mm2 (Knoop 100 g).

    • The fracture toughness of boron carbide is 2.9-3.7 MPam−1/2.

    • The Young's modulus of boron carbide is 450-470 GPa.

    • The conductivity of boron carbide at 25 °C is 140 S.

    • Thermal conductivity at 25 °C is 30-42 W/m.K

    • Thermal neutron capture for boron carbide is 600 barn.

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