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Study On Preparation Method Of Tungsten Boride Ceramics

2018-10-23      View:

The transition metal borides have high melting point, high hardness, high electrical conductivity and excellent wear resistance, and have high corrosion resistance and oxidation resistance for different types of media, it is widely used in high temperature structural materials, refractory materials, electrode materials and other fields.


In 1966, Woods prepared Tungsten Boride by heating boron wire in a mixed atmosphere of WCl6 and argon. Thereafter, B-W compounds were successively synthesized by chemical vapor deposition, elemental synthesis, floating zone melting, molten salt electrolysis, and self-propagating combustion synthesis.


Mix the boron powder and the tungsten powder in different proportions, and the tungsten boride powder is synthesized by a high-temperature solid phase reaction under vacuum, and then the WB2 ceramic is prepared by the pressureless sintering method.


In the solid phase sintering process, the difference in free energy or chemical potential between the neck region of the particle and the particle surface provides a driving force for the transfer of the material. During the sintering process of WB2 ceramics, substances can migrate from the surface of the particles to the host or grain boundary by surface diffusion, lattice diffusion, grain boundary diffusion and so on.


The sintering temperature has a great influence on the sintering behavior of WB2. When the sintering temperature is 1800 °C, WB2 ceramics with a porosity of 5.2% and a relative density of 86.0% can be obtained.