Effects of VC and Mo2C on the Microstructure and Mechanical Properties of WC-Ni3Al Cemented Carbide by Microwave Sintering
Microwave sintering technology is used to prepare WC-Ni3Al-based cemented carbides with different VC and Mo2C additions,and the effects of adding VC and Mo2C on its microstructure and mechanical properties are investigated.The addition of VC and Mo2C can inhibit the dissolution-precipitation process of WC grains,thereby refining the WC grains,and at the same time make the distribution of the binder phase Ni3Al uniform.It can also be found that VC has a more obvious grain refinement effect than Mo2C.The addition of VC reduces the relative density,bending strength and fracture toughness of the WC-Ni3Al-based cemented carbide and increases its hardness.When the VC content is 0.6%,its hardness is 1 413 HV.When the Mo2C content is 1.5%,the relative density,bending strength and hardness of WC-Ni3Al-based cemented carbide are increased but the fracture toughness is decreased.When the Mo2C content continues to increase,its mechanical properties are reduced due to the decrease of its relative density and the occurrence of Mo2C segregation.
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