烧结温度对WC-HEA硬质合金组织结构和摩擦学性能的影响  

Effect of sintering temperature on microstructure and tribological properties of WC-HEA cemented carbide

作　　者：常剑秀 张露 柳琪 李珂尧 宋佳星 曹培培 彭祥阳 Chang Jianxiu;Zhang Lu;Liu Qi;Li Keyao;Song Jiaxing;Cao Peipei;Peng Xiangyang(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Xi'an Rare Metal Materials Institute Co.,Ltd.,Xi'an Shaanxi 710016,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen Guangdong 518031,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]西安稀有金属材料研究院有限公司,陕西西安710016 [3]中广核研究院有限公司,广东深圳518031

出　　处：《金属热处理》2025年第3期90-95,共6页Heat Treatment of Metals

基　　金：陕西省自然科学基金(2018JQ5198);秦创原引用高层次创新创业人才项目(QCYRCXM2023-036)。

摘　　要：采用CrFeNiCu_(0.5)高熵合金(HEA)替代传统金属粘结相(Co、Fe及Ni),并结合真空热压烧结法成功制备了WC-CrFeNiCu_(0.5)(HEA)新型硬质合金,探究了不同烧结温度(1050、1100、1200和1300℃)下WC-HEA硬质合金的组织结构演变及其对摩擦磨损性能的影响。结果表明,不同温度烧结WC-HEA硬质合金的物相主要包含WC和FCC相,以及少量的Cu-Fe合金和M_(3)W_(3)C亚稳态碳化物。当烧结温度为1100℃时,WC-HEA硬质合金表现出最高的致密性和最低的磨损率,孔隙率仅5.15%±0.6%,磨损率0.96×10^(-6)mm^(3)·N^(-1)·m^(-1),耐磨性最优。不同温度烧结WC-HEA硬质合金的磨损机制均以磨粒磨损为主,并伴随轻微的粘着磨损。A novel cemented carbide WC-CrFeNiCu_(0.5)(HEA)was successfully fabricated by substituting CrFeNiCu_(0.5)high-entropy alloy for the conventional metal binder(Co,Fe,and Ni)and vacuum hot-pressing sintering method.The microstructure evolution of the WC-HEA cemented carbide sintered at different temperatures(1050,1100,1200,and 1300℃)and its influence on the friction and wear properties were systematically investigated.The results show that the phases of the WC-HEA cemented carbide sintered at different temperatures mainly include WC and FCC phases,as well as a small amount of Cu-Fe alloy and metastable carbide M_(3)W_(3)C.When the sintering temperature is 1100℃,the WC-HEA carbide shows the highest densification and the lowest wear rate,with a porosity of only 5.15%±0.6%and a wear rate of 0.96×10^(-6)mm^(3)·N^(-1)·m^(-1),resulting in the best wear resistance.The wear mechanisms of the WC-HEA cemented carbides sintered at different temperatures are mainly abrasive wear,accompanied by slight adhesive wear.

关 键 词：WC-HEA硬质合金 烧结温度 孔隙率 耐磨性 

分 类 号：TG156.8[金属学及工艺—热处理]