烧结温度对WC-TiC-TaC-Co硬质合金性能的影响

摘要

In this study, WC -TiC-TaC-Co cemented carbide was sintered by lowpressure sintering at the different sintering temperature. The microstructure and mechanical properties of alloy were analyzed by metallographic microscope. X-ray diffraction and scanning electron microscopy. The results demonstrated that threephased alloy WC ＋(WC-TiC-TaC) ＋γ could be formed by the method of lowpressure sintering. In addition, results reveal the best overall performance was abtained at 1475℃ : density. Vickers hardness, bending strength and fracture toughness were: 12.934gcm, 1843HV30, 1707MPa, 9.18MPa · m1/2 respectively.%采用不同温度下的低压烧结工艺制备WCTiC-TaC-Co硬质合金.结合金相显微镜、XRD及SEM等分析测试手段,研究了烧结温度对合金的微观组织和性能的影响.结果表明,低压烧结工艺下形成了WC+(WC-TiC-TaC)+γ三相合金;合金在1475℃下获得最优的综合性能,其密度、维氏硬度、抗弯强度及断裂韧性分别为:12.94g/cm.、1843HV30、1707MPa、9.18MPa·m1/2.