Ag掺杂Mo-12Si-8.5B合金在25~600℃的摩擦学行为  

Tribological Behavior of Ag-Doped Mo-12Si-8.5B Alloy from 25 to 600℃

作　　者：胡华荣[1] 尹果 杨洪宇 郭源君 颜建辉[2,3] 陈芳 HU Huarong;YIN Guo;YANG Hongyu;GUO Yuanjun;YAN Jianhui;CHEN Fang(School of Mechanical Engineering,Hunan University of Science and Technology,Hunan Xiangtan 411201,China;School of Materials Science and Engineering,Hunan University of Science and Technology,Hunan Xiangtan 411201,China;Hunan Provincial Key Defense Laboratory of High Temperature Wear Resisting Materials and Preparation Technology,Hunan University of Science and Technology,Hunan Xiangtan 411201,China;School of Physics and Electronic Science,Hunan University of Science and Technology,Hunan Xiangtan 411201,China)

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]湖南科技大学材料科学与工程学院,湖南湘潭411201 [3]湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湖南湘潭411201 [4]湖南科技大学物理与电子科学学院,湖南湘潭411201

出　　处：《摩擦学学报（中英文）》2024年第7期884-892,共9页Tribology

基　　金：国家自然科学基金项目(52175167);湖南省教育厅一般项目(22C0259);大学生创新训练项目(S202310534036)资助。

摘　　要：本文中采用放电等离子烧结法制备了Mo-12Si-8.5B和Mo-12Si-8.5B-10%Ag这2种合金,通过高温真空摩擦磨损试验仪测试了2种合金与Al_(2)O_(3)摩擦副在25~600℃间的干摩擦学性能.结果表明:与Mo-12Si-8.5B合金相比,在25~600℃区间Mo-12Si-8.5B-10%Ag合金表现出更低的摩擦系数和磨损率.在600℃时,Mo-12Si-8.5B-10%Ag合金的摩擦系数和磨损率均可达到最小值,其值分别为0.41和1.14×10^(-5)mm^(3)/(N·m),此时Mo-12Si-8.5B-10%Ag合金的干摩擦性能表现最佳,这与Mo-12Si-8.5B-10%Ag合金磨损表面的MoO_(3)、SiO_(2)和Ag_(2)MoO_(4)等润滑相的存在及Ag在25~600℃范围内起到的润滑效果有关.此外,在25~200℃区间,Mo-12Si-8.5B-10%Ag合金的磨损机制主要为黏着磨损和剥层磨损,在400~600℃范围内,则以黏着磨损和氧化磨损为主.With the continuous development of modern aerospace industry,the requirements for the operation temperature and service life of high-temperature materials are becoming higher.And the working conditions of materials are becoming more stringent.Therefore,the development and preparation of new ultra-high temperature structural materials is urgent.Mo-Si-B ternary alloys have become one of the promising new ultra-high temperature candidate materials because of their high melting point(2000℃),high strength,high hardness and excellent high-temperature oxidation resistance.The Mo-12Si-8.5B(atom fraction/%)alloy,consisted ofα-Mo-based,Mo_(3)Si,and Mo_(5)SiB_(2)intermetallic compound reinforcement phases,has been extensively researched due to its excellent high-temperature strength,excellent creep resistance,and balance between high-temperature oxidation resistance.What’s more,it is anticipated to be a key material in high-temperature applications.Al_(2)O_(3) ceramics are often used in hybrid bearing components of high-performance jet engines.As the moving parts,the Mo-12Si-8.5B alloy and Al_(2)O_(3) ceramics will experience dry friction relative sliding within a certain temperature range.However,according to the current research reports on the dry friction and wear characteristics of Mo-12Si-8.5B alloy at moderate temperatures(600℃)and below the two important indicators for evaluating its tribological properties,the friction coefficient and the wear rate are still relatively high.Therefore,at the moderate temperatures and below,how to reduce the friction coefficient and wear rate of Mo-12Si-8.5B alloy and ceramic pairing pairs,and how to improve the effective lubrication and self-lubricating function of the alloy both provides strong theoretical support for the practical application of Mo-12Si-8.5B alloy in engineering.In this article,Mo-12Si-8.5B and Mo-12Si-8.5B-10%Ag alloys were prepared by spark plasma sintering method and the dry friction and wear properties of the two alloys paired with Al_(2)O_(3) were teste

关 键 词：Mo-12Si-8.5B-10%Ag合金 Al_(2)O_(3) 中低温 干摩擦 磨损机理 

分 类 号：TH117.2[机械工程—机械设计及理论] TG172.2[金属学及工艺—金属表面处理]