摘要
Mo_(2)FeB_(2)基金属陶瓷不仅具有高硬度,优异的耐磨、耐腐蚀、耐高温及抗热冲击性能,而且它与大多数钢材的热膨胀系数相当,因此其在工模具材料、优质轴承以及高性能涂层(覆层)等应用领域显示出巨大的发展潜力及广阔的应用前景。本文简单介绍了Mo_(2)FeB_(2)基金属陶瓷的成分、组织和性能的特点,重点阐述了硼、碳、稀土和过渡族金属元素,以及外加增强相和晶粒长大抑制剂对其物相组成、致密度、晶粒尺寸、硬度、抗弯强度和断裂韧性等的影响规律及作用机理,总结了Mo_(2)FeB_(2)基金属陶瓷及其涂层(覆层)的制备工艺,并提出了其未来的研究重点应从合金元素对Mo_(2)FeB_(2)硬质相力学性能及生长行为的影响规律与作用机理、废旧Mo_(2)FeB_(2)基金属陶瓷的回收技术等方面开展。
Mo_(2)FeB_(2) based cermet is characterized by high hardness,excellent wear-resistance,corrosion resistance,high temperature resistance and thermal shock resistance.Moreover,its coefficient of thermal expansion is similar to most of steel and iron materials.Thus,it shows great development potentiality and broad application foreground in the field of tool and mould materials,high-performance bearing,coatings(claddings),etc.In this paper,the chemical composition,microstructure and properties of Mo_(2)FeB_(2) based cermets are briefly introduced.In particular,the effects of boron,carbon,rare earth,transition metal elements,and additional strengthening phase and grain growth inhibitor on its phase composition,density,grain size,hardness,transverse rupture strength and fracture toughness and their action mechanism are emphatically expounded.And then the preparation technologies of Mo_(2)FeB_(2) based cermets and their coatings and claddings are summarized.Finally,it is proposed that the future research should be focused on the effects of alloying elements on mechanical properties and growth behavior of Mo_(2)FeB_(2) phase and their action mechanism,and the reclamation techniques of discarded Mo_(2)FeB_(2) based cermets,etc.
作者
刘宇
魏祥
魏修宇
彭广威
刘宝刚
孔令男
汪力
吴吉文
Liu Yu;Wei Xiang;Wei Xiuyu;Peng Guangwei;Liu Baogang;Kong Lingnan;Wang Li;Wu Jiwen(Department of Materials Engineering,Hunan University of Humanities,Science and Technology,Loudi Hunan 417000,China;Zhuzhou Cemented Carbide Group Corp.Ltd.,Zhuzhou Hunan 412000,China;State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China)
出处
《硬质合金》
CAS
2021年第5期376-385,共10页
Cemented Carbides
基金
湖南省自然科学基金项目(2020JJ5274)
湖南省教育厅项目(19B292)。
