【摘要】 探讨了添加超细混合稀土氧化物微粉对WC－8Co硬质合金组织结构和性能的优化机理．结果表明，混合稀土氧化物提高WC－8CO合金强韧性的原因，不仅是由于WC晶粒尺寸的细化、不连续长大的粗晶WC的消除和立方钻相含量的提高，还与合金制品宏观应力的增加有关。更多还原

【Abstract】 The optimizing mechanism for the microstructure and the performance of WC8Co cemented carbides by adding ultrafine mixed powder of rare earths oxidate has been explored. The results show that, the mixed powder of rare earths oxidate can not only fine the WC grain, eliminate the uncontinuous growth WC grain and raise the fee Co-phase content inalloy, but also can evidently raise the macro pressure stress on alloy surface.更多还原