以喷雾转化工艺(SCP)制备的纳米WC-10%Co(质量分数)粉为原料, 应用脉冲放电烧结方法(EDC)制备出平均晶粒尺寸为120 nm左右的超细晶WC-Co硬质合金, 并对样品的微观组织结构与力学性能进行了分析. 结果表明, EDC方法极短的烧结时间是抑制晶粒长大的重要原因. 除裂纹桥联机制外,弥散分布的小孔隙对提高WC-Co硬质合金的断裂韧性也起到重要作用.
WC-10%Co (mass fraction) cemented carbide with an average grain size of 120 nm are fabricated by means of electric-discharge compacting (EDC) the nano-crystalline WC-10%Co powders which were synthesized by spray conversion process (SCP). Microstructure and mechanical properties of the cemented carbide are investigated. Because of short holding time during EDC, the grain growth is retarded. It is found that the dispersed micro-size pores are contributed to the high fracture toughness of the samples besides the bridging ligament mechanism.
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