The effect of Y₂O₃ on the microstructure and mechanical properties of tungsten carbide with 12 wt.% cobalt prepared using a solid-liquid doping method and spark plasma sintering (SPS) was investigated. The novelty of this study is the use of solid-liquid method for addition of Y₂O₃ into WC-Co material. Composition, microstructures, densities, hardness, and fracture toughness of WC-Co-Y₂O₃-cemented carbides were analyzed using XRD, SEM, TEM and measuring equipment. Results show that, the existence of Y₂O₃ hindered the growth of WC grains, and the WC grain size decreased to 0.98 µm. The coherent relationship between Y₂O₃ phase and WC phase is considered as semi-coherent. Furthermore, Y₂O₃ did not increase the porosity of WC-based sample, and the sample with Y₂O₃ added possessed almost full relative density. And the sample with 1.3 wt.% Y₂O₃ possessed maximum hardness and fracture toughness measured at 1446.9 HV and 11.9 MPa·m^1/2, respectively. Therefore, we improved the mechanical properties of WC-Co-cemented carbides with 1.3 wt.% Y₂O₃ doped via solid-liquid doping method and compared with the Y₂O₃-undoped WC-Co alloy.

研究了Y ₂ O ₃对固液掺杂法和火花等离子体烧结（SPS）制得的钴含量为12％（重量）的碳化钨的组织和力学性能的影响。这项研究的新颖之处在于使用固液法将Y ₂ O _3添加到WC-Co材料中。使用XRD，SEM，TEM和测量设备对WC-Co-Y ₂ O ₃胶结碳化物的组成，显微组织，密度，硬度和断裂韧性进行了分析。结果表明，Y ₂ O ₃的存在阻碍了WC晶粒的生长，WC晶粒尺寸减小到0.98 µm。Y ₂之间的相干关系O ₃相和WC相被认为是半相干的。此外，Y ₂ O ₃不会增加WC基样品的孔隙率，并且添加了Y ₂ O ₃的样品具有几乎完全的相对密度。并且具有1.3wt。％的Y ₂ O ₃的样品分别具有在1446.9HV和11.9MPa·m ^1/2下测得的最大硬度和断裂韧性。因此，我们改进了WC-Co硬质合金的力学性能，该合金通过固液掺杂方法掺杂了1.3 wt。％的Y ₂ O _3，并与未掺杂Y ₂ O _3的WC-Co合金进行了比较。