WC-8Co composite powders doped with Y₂O₃ were prepared by wet chemical method, and the densification of alloy proceeded by spark plasma sintering at 1200 °C, 1250 °C, and 1300 °C. The microstructure of the composite powders and alloys was analyzed by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. Result showed that the addition of Y₂O₃ could refine WC particles during carbonization and WC grains during sintering. In the microstructure of WC-Co alloys, Y₂O₃ solidly dissolved in the body of WC crystal with the form of the second-phase nanocrystal. Moreover, the effect of sintering temperature on WC-8Co cemented carbide doped with Y₂O₃ was studied. The comprehensive performance of WC-8Co cemented carbide doped with Y₂O₃ was best at the sintering temperature of 1250 °C with the hardness of 19.64 GPa and fracture toughness of 11.97 MPa m^1/2.

采用湿化学法制备了掺杂有Y ₂ O _3的WC-8Co复合粉末，并通过在1200°C，1250°C和1300°C下的火花等离子体烧结对合金进行致密化处理。通过X射线衍射，扫描电子显微镜，能量色散X射线光谱，透射电子显微镜和高分辨率透射电子显微镜分析了复合粉末和合金的微观结构。结果表明，添加Y ₂ O ₃可以细化碳化过程中的WC颗粒和烧结过程中的WC晶粒。在WC-Co合金的微观结构中，Y ₂ O ₃以第二相纳米晶体的形式牢固地溶于WC晶体体内。此外，研究了烧结温度对掺有Y ₂ O _3的WC-8Co硬质合金的影响。掺Y ₂ O ₃的WC-8Co硬质合金的综合性能在烧结温度1250°C时表现最好，硬度为19.64 GPa，断裂韧性为11.97 MPa m ^1/2。