Boron carbide micro powder and preparation method thereof

Abstract

The invention discloses a preparation method of a boron carbide micro powder, which comprises the following steps: 1) mixing boron trioxide with bamboo carbon micro powder in the molar ratio of 2 to 7 at room temperature; and then mechanically grinding and crushing the mixture so as to obtain a homogeneous composite precursor; and 2) heating the homogeneous composite precursor in a vacuum sintering furnace for 1 to 4 hours at the temperature of 2,000 to 2,200 DEG C; and cooling the sintered product and taking the cooled product out so as to obtain boron carbide micro powder. The invention also provides the boron carbide micro powder prepared by the method. The boron carbide micro powder prepared by the method has the characteristics of high purity and controllable particle size distribution.

Description

technical field

[0001] The invention relates to a boron carbide powder and a preparation method thereof, in particular to a boron carbide micropowder and a preparation method thereof. Background technique

[0002] Boron carbide is an important special ceramic with many excellent properties. Due to its incomparable excellent performance with other materials, the depth and intensity of research on boron carbide ceramics are increasing. The hardness of boron carbide is second only to diamond and cubic boron nitride in nature, especially its nearly constant high-temperature hardness (>30GPa) is unparalleled by other materials, so it has become an important member of the superhard material family. In boron carbide, boron and carbon are mainly combined by covalent bonds (>90%), which has a high melting point (2450°C), high hardness, high modulus, and low density (2.52g / cm 3 ), good wear resistance, strong acid and alkali resistance, etc., and has good neutron and oxygen ab...