Effects of Ce2O3 Content on Microstructure and Properties of WC-based Cemented Carbide
Taking different types of WC powders(cast WC,spherical WC,and fine-grained WC)and nickel powder as skeleton,and CuNi alloy as bonding metal,WC-based cemented carbide was fabricated by non-pressure fusion method at 1 200℃for 1 h.Effects of different amounts of Ce2O3(0%,0.2%,0.4%,0.6%,0.8%,and 1.0%)on microstructure and mechanical properties of WC-based cemented carbide were investigated.The results indicate that WC is decomposed or dissolved to varying degrees at experimental temperatures.Simultaneously,new phases,such as C,W2C,and Ni2W4C,are generated during fusion process.The plate-shaped WC in the microstructure is condu-cive to enhancing hardness and bending strength,while the presence of Ni2W4C is helpful to enhance impact toughness.Hardness and bending strength reach the maximum values of 93.5 HRA and 1 844.7 MPa,respectively,when Ce2O3 content is 0.6%,and the highest impact toughness of 6.45 J/cm2 can be obtained at a Ce2O3 content of 1.0%.
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