采用SPS烧结技术制备WC-6Co-xCr3C2(x=0~0.6%,质量分数)硬质合金,并通过SEM、EDS、力学性能测试仪、摩擦磨损试验机和电化学工作站等测试手段研究Cr3C2含量对SPS烧结WC-6Co硬质合金显微组织和性能的影响.结果表明:随着Cr3C2添加量的增大,合金的晶粒异常长大现象消失,晶粒变得细小均匀;同时发现Cr3C2的添加可以明显改善合金的力学性能、摩擦磨损性能和耐腐蚀性能.当其添加量为0.45%时,合金综合性能最优,硬度为1933 HV30,断裂韧性达到12.5 MPa?m1/2.%The WC-6Co cemented carbides with various contents of grain growth inhibitors Cr3C2were fabricated by spark plasma sintering (SPS). The effects of Cr3C2 amount on the microstructures and performances of the cemented carbides were investigated by SEM, EDS, mechanical property tester, wear testing machine and electrochemical workstation. The results show that, with increasing the amount of Cr3C2 in the cemented carbides, the abnormal growth of WC grains disappears and homogeneous submicron-grained microstructure forms. At the same time, the addition of Cr3C2 can obviously improve the mechanical properties, wear performance and corrosion resistance of the alloys. When the Cr3C2 addition is 0.45%, the comprehensive performances of the alloy are the best. The hardness is 1933HV30 and fracture toughness is 12.5MPa?m1/2.
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