(1. 合肥工业大学 材料科学与工程学院，合肥 230009；
2. 有色金属与加工技术国家地方联合工程研究中心，合肥 230009；
3. 高性能铜合金材料及成形加工教育部工程研究中心，合肥 230009)
摘 要: 本文采用固-液掺杂和SPS工艺在1250 ℃和50 MPa下获得高致密的WC-Co-Y2(Zr)O3硬质合金，并研究了Y2(Zr)O3对WC-Co硬质合金的显微组织和力学性能的影响。利用XRD、SEM、TEM及维氏硬度计对硬质合金的组成、显微组织、硬度和断裂韧性进行了测量分析。结果表明：含有0.15%ZrO2和1.30%Y2O3的WC-Co-Y2(Zr)O3合金样品的维氏硬度和断裂韧性分别为1428.6 HV和12.8 MPa·m1/2，与WC-Co样品相比，在保持高硬度的基础上，断裂韧性提升了17.4%；Y、Zr和O元素以Y2(Zr)O3化合物的形式存在于WC-Co-Y2(Zr)O3硬质合金，提高了合金的断裂韧性。
关键字: Y2(Zr)O3；固-液掺杂；SPS；断裂韧性；硬质合金
（1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China;
3. Engineering Research Center of High Performance Copper Alloy Materials and Processing, Ministry of Education, Hefei 230009, China）
Abstract:In this paper, the high density WC-Co-Y2(Zr)O3 cemented carbides were obtained by solid-liquid doping and SPS process at 1250 ℃ and 50MPa, and the effect of Y2(Zr)O3 on the microstructure and mechanical properties of WC-Co cemented carbides was studied. The composition, microstructure, hardness and fracture toughness of cemented carbide were measured and analyzed by XRD, SEM, TEM and Vickers hardness tester. The results show that the Vickers hardness and fracture toughness of WC-Co-Y2(Zr)O3 alloy samples containing 0.15%ZrO2 and 1.30%Y2O3 are 1428.6 HV and 12.8 MPa·m1/2, respectively. Compared with WC-Co samples, the fracture toughness increases by 17.4% on the basis of maintaining high hardness. The elements of Y, Zr and O are presented in the form of Y2(Zr)O3 compounds in WC-Co-Y2(Zr)O3 cemented carbide, which improves the fracture toughness of the alloy.
Key words: Y2(Zr)O3; solid-liquid doping; SPS; fracture toughness; cemented carbide
