Effect of Cr_(2)O_(3)/Cr_(3)C_(2)additions on mechanical and tribological properties of Ti(C,N)-based cermets  

加入Cr_(2)O_(3)/Cr_(3)C_(2)对Ti(C,N)基金属陶瓷力学和摩擦性能的影响

作　　者：Mei-ling LIU Ya-jing CAO Wan-xiu HAI Yu-hong CHEN 刘美玲;曹雅璟;海万秀;陈宇红(北方民族大学材料科学与工程学院,银川750021;北方民族大学粉体材料与特种陶瓷省部共建重点实验室,银川750021)

机构地区：[1]School of Materials Science and Engineering,North Minzu University,Yinchuan 750021,China [2]Key Laboratory of Powder Material and Advanced Ceramics,North Minzu University,Yinchuan 750021,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期525-537,共13页中国有色金属学报(英文版)

基　　金：Natural Science Foundation of Ningxia,China(No.2023AAC03284);Fundamental Research Funds for the Central Universities Research Project of North Minzu University,China(No.2022XYZCL04);Project of Key Laboratory of Powders and Advanced Ceramics;Co-founded by Ningxia and the State Ethnic Affairs Commission,China(No.2103)。

摘　　要：Cr_(2)O_(3)was used as grain inhibitor in Ti(C,N)-based cermets with vacuum sintering.The microstructure and mechanical and tribological properties of cermets with Cr_(2)O_(3)and Cr_(3)C_(2)were investigated.The results show that adding Cr_(2)O_(3)promotes a gray core/gray rim structure formation and finer size of Ti(C,N)hard phase.Compared with the cermet with an equal Cr_(3)C_(2)addition,the cermet with 0.6 wt.%Cr_(2)O_(3)exhibits 16.5%higher transverse rupture strength.This enhancement is likely due to the smaller lattice misfit at the core/rim interface and more uniform Cr distribution in the binder.Additionally,at room temperature(25℃)and 800℃,Cr_(2)O_(3)-containing cermets demonstrate lower coefficients of friction and volume wear ratios than Cr_(3)C_(2)-containing cermets,with the wear ratio difference reaching an order of magnitude.Scanning electron microscopy and X-ray photoelectron spectroscopy results further confirm more oxidation wear in Cr_(2)O_(3)-containing cermets than in Cr_(3)C_(2)-containing cermets.加入Cr_(2)O_(3)作为晶粒抑制剂,真空烧结制备Ti(C,N)基金属陶瓷,研究陶瓷的显微组织、力学性能和摩擦磨损性能。结果表明:Cr_(2)O_(3)促进灰芯/灰环结构的形成并减小Ti(C,N)硬质相的粒径。和含等量Cr_(3)C_(2)的陶瓷对比,含0.6%(质量分数)Cr_(2)O_(3)陶瓷的抗弯强度提升16.5%,这是由于灰色芯环结构界面处具有更小的晶格错配度和Cr元素在黏结剂中分布更加均匀。在25和800℃摩擦磨损实验中,由于具有更高的硬度,含Cr_(2)O_(3)陶瓷具有更低的摩擦因数和磨损率,磨损率优于含Cr_(3)C_(2)陶瓷一个数量级。采用扫描电子显微镜和X射线光电子能谱进一步确认含Cr_(2)O_(3)陶瓷更多表现为氧化磨损。

关 键 词：TI(C N) Cr_(2)O_(3) grain inhibitor mechanical properties tribological properties 

分 类 号：TG148[一般工业技术—材料科学与工程]