Ni3Al基涂层与不同材料配副时宽温域的摩擦学行为  

Tribological Behaviors of NiAl-Based Coating Coupled with Different Counterpart Materials in Wide Temperature Range

作　　者：范祥娟 李文生[1] 杨军[2] 朱圣宇[2] 程军[2] 何东青 FAN Xiangjuan;LI Wensheng;YANG Jun;ZHU Shengyu;CHENG Jun;HE Dongqing(State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals,Lanzhou University of Technology,Gansu Lanzhou 730050,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)

机构地区：[1]兰州理工大学有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2020年第6期687-696,共10页Tribology

基　　金：甘肃省国际科技合作特派员计划(17JR7WA017);国家重点研发计划国际科技合作项目(2016YFE0111400);国家自然科学基金项目(51674130);甘肃省重点研发计划项目(17YF1WA159)资助。

摘　　要：采用等离子喷涂法制备Ni3Al基涂层,分别以316L和Al2O3为摩擦偶件,考察25~800℃内摩擦偶件材料对涂层摩擦学行为的影响.结果表明:在软金属Ag析出、Ba F2/Ca F2脆-塑性转变和摩擦氧化协同作用下,随温度升高Ni3Al/316L和Ni3Al/Al2O3摩擦副的摩擦系数和磨损率具有一致的变化规律,且Ni3Al/Al2O3摩擦副性能更佳.25℃时,涂层与316L对摩时发生黏着磨损和磨粒磨损,而与高硬度的Al2O3对摩时发生脆性剥层和磨粒磨损,使涂层表面更粗糙导致较高的摩擦系数;Al2O3热导率较低,高接触应力作用下产生的大量摩擦热不能及时耗散,剥落材料贮存于剥落坑或黏附于磨损表面,使Ni3Al/Al2O3摩擦副具有较低的磨损率.200~600℃时,高硬度的Al2O3对涂层的犁削作用较强导致Ni3Al/Al2O3摩擦副具有高的摩擦系数;而涂层在Al2O3碾压下发生塑性变形,使其具有较低的磨损率.800℃时,高硬度的Al2O3促使磨损表面形成高氧化物含量的润滑膜,使Ni3Al/Al2O3摩擦副具有低的摩擦系数和高的磨损率.The Ni3Al based composite coating was prepared by plasma spraying.The influences of 316L and Al2O3 counterpart material on the tribological behaviors of the coating at 25℃to 800℃were investigated.The results showed that under the synergistic action of precipitation of soft metal Ag,brittle-plastic transformation of BaF2/CaF2 and tribooxidation,the friction coefficient and wear rate of Ni3Al/316L and Ni3Al/Al2O3 tribo-pairs had the similar trend with the increase of temperature,and the Ni3Al/Al2O3 tribo-pairs had better performance.At 25℃,the coating coupled with 316L adhesive wear and abrasive wear occurred,while brittle peeling and abrasive wear occurred when the coating coupled with Al2O3 of high hardness,resulting in rougher coating surface and higher friction coefficient.However,the thermal conductivity of Al2O3 was low,and a large amount of frictional heat generated under the action of high contact stress cannot be dissipated rapidly.The stripped material was stored in the peeling hole or adhered to the worn surface,resulting in a lower wear rate of Ni3Al/Al2O3 friction pair.At 200~600℃,the Al2O3 of high hardness had a strong plough effect on the coating,resulting in a higher friction coefficient of Ni3Al/Al2O3 friction pair.Meanwhile,Al2O3 promoted the plastic deformation of the coating,inhibited the fatigue stripping of the material,and made the coating with lower wear rate.At 800℃,the high hardness of Al2O3 promoted the formation of a lubrication film with high oxide content on the worn surface,so that the Ni3Al/Al2O3 friction pair had low friction coefficient but high wear rate.

关 键 词：NI3AL基 等离子喷涂 摩擦偶件 宽温域 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]