超音速等离子喷涂Mo涂层的摩擦磨损性能  

Friction and Wear Properties of Mo Coating Prepared by Supersonic Plasma Spray

作　　者：刘贵民[1] 杨忠须 魏敏 闫涛[1] 

机构地区：[1]装甲兵工程学院装备维修与再制造工程系,北京100072 [2]北京福锐克森热喷涂科技有限公司,北京102200

出　　处：《装甲兵工程学院学报》2015年第6期82-88,共7页Journal of Academy of Armored Force Engineering

基　　金：北京市自然科学基金资助项目(2152031);再制造技术国防科技重点实验室基金资助项目(9140C8502010C85)

摘　　要：为提高45Cr Ni Mo VA钢表面的耐磨性能,采用HEP Jet超音速等离子喷涂系统在其表面制备了Mo涂层,通过场发射型超高分辨率扫描电镜(Field Emission Scanning Electron Microscopy,FESEM)、X射线能量谱仪(Energy Dispersive Spectrometer,EDS)、电子扫描电镜(Scanning Electron Microscopy,SEM)及高精度三维形貌仪对比分析了涂层与基体的摩擦磨损性能及磨损机理,并对涂层磨损率的影响因素进行了研究。结果表明:轻载荷(试验载荷为5 N)、低频率(滑动频率为5 Hz)下,涂层的磨损率略低于基体,其磨损机理为粘着磨损和氧化磨损,而基体为粘着磨损、氧化磨损和轻微的磨粒磨损;重载荷(试验载荷为20 N)、高频率(滑动载荷为20 Hz)下,涂层的磨损率约为基体的50%,磨损机理同样为粘着磨损和氧化磨损,基体则表现为严重的磨粒磨损和氧化磨损;涂层磨损率随载荷的增加呈先上升后下降的趋势;涂层磨损率随滑动频率增大而上升,但上升速度不一,这与摩擦生热量对氧化膜生成速度影响程度密切相关;涂层磨损率随时间延长而稳定上升。To enforce the anti-wear performance of 45 Cr Ni Mo VA steel surface,the Mo coating is prepared on 45 Cr Ni Mo VA steel surface by HEP Jet supersonic plasma spraying system,and the anti-wear performance and mechanism of coating and substrate are compared and studied through Field Emission Scanning Electron Microscopy( FESEM),Scanning Electron Microscopy( SEM),Energy Dispersive Spectrometer( EDS) and 3D Profiler,the effects of tribological condition on the wear rate of coating are also discussed. The results show that the coating wear rate is slightly less than that of the substrate with light load( test load 5 N) and low frequency( sliding frequency 5 Hz),and the wear mechanism belongs to adhesive wear and oxidative wear,while the substrate displays adhesive wear,oxidative wear and abrasive wear. When under heavy load( test load 20 N) and high frequency( sliding frequency 20 Hz) model,the wear rate of the coating is about half of the substrate,which shows a good wear-resisting performance,and the wear mechanism of coating is adhesive wear and oxidation wear,however,the substrate belongs to the serious abrasive wear and oxidation wear. The coating wear rate shows a trend of rise first then fall with the increase of load. With the increasing of slide frequency,the wear rate also rises,but the speed of rise is different,which may be resulted from the effect of friction heat on the generation speed of oxidation film. The wear rate of coating stably climbs as wear time increases.

关 键 词：Mo涂层 超音速等离子 耐磨性 磨损机理 

分 类 号：TG174.442[金属学及工艺—金属表面处理]