摘要
目的提高45NiCrMoVA钢的高频载流摩擦磨损性能。方法采用超音速等离子喷涂技术在表面制备Mo涂层,通过红外热成像仪、高速摄像机记录载流摩擦实验中的温度分布、起弧率和电弧形貌。采用载流摩擦磨损试验机、三维形貌仪测算涂层的摩擦系数、稳定性系数、磨痕轮廓和磨损率。利用场发射扫描显微镜、X射线能谱分析仪、X射线衍射仪对磨痕、磨屑进行分析。结果当滑动频率由5 Hz提升至20 Hz时,起弧率由1.13%提升至8.24%,造成的电弧烧蚀区面积逐渐扩大。载流摩擦过程中表面的温度变化明显受滑动频率与实验时间的影响,各组均在300 s时达到最高温度,范围为63.3~91.7℃。随滑动频率的增加,涂层的摩擦系数及稳定性系数呈先下降后上升趋势,15 Hz时,两者值达到最小,为0.337(平均摩擦系数)和1.443。磨损率同样随滑动频率的增加呈先下降后上升趋势,10 Hz时达到最小,为66.6×10^4μm^3/(N·m);当频率大于15 Hz时,磨痕深度、宽度大幅增加。结论摩擦膜可以降低摩擦副间的粘着倾向,提高运动稳定性,其形成与破裂受表面温度、材料屈服强度等多方面因素的影响,是导致摩擦系数变化的主要原因。载流摩擦除机械损耗外,还存在电气损耗及电气-机械共同损耗。高频率下,电弧烧蚀现象明显,同时加剧了粘着磨损、氧化磨损、层片剥落及磨粒磨损,导致磨损率较高。
The work aims to improve the high-frequency current-carrying friction and wear properties of 45NiCrMoVA steel.The Mo coating was prepared on the surface by supersonic plasma spraying.The temperature distribution,arc rate and arc morphology were recorded by infrared thermal imager and high-speed camera in the experiment of current-carrying friction.The friction coefficient,stability coefficient,wears profile and wear rate of the coating were measured by a current-carrying friction and wear tester and a three-dimensional topography instrument.The wear marks and debris were analyzed by Field-Emission Scanning Electron Microscope,Energy Dispersive Spectrometer,and X-Ray Diffraction.When the sliding frequency increased from 5 Hz to 20 Hz,the arc initiation rate increased from 1.13%to 8.24%,resulting in a gradual expansion of the arc ablation area.The change of surface temperature in the process of current-carrying friction was obviously influenced by sliding frequency and experimental time.The maximum temperature of each group reached at 300 s,ranging from 63.3℃to 91.7℃.The friction coefficient and stability coefficient of the coating decreased first and then increased with the increase of sliding frequency.At 15 Hz,the values of friction coefficient and stability coefficient reached the minimum,which was 0.337(average friction coefficient)and 1.443 respectively;The wear rate also decreased first and then increased with the growth of sliding frequency,and reached the minimum value at 10 Hz,which was 66.6×10^4μm^3/(N·m).When the frequency was greater than 15 Hz,the depth and width of wear mark increased greatly.The friction film can reduce the adhesion tendency between friction pairs and improve the motion stability.The formation and fracture of friction film are affected by many factors such as surface temperature,material yield strength and so on,which are the main reasons for the change of friction coefficient.In addition to mechanical losses,current-carrying friction also has electrical losses and electrical
作者
惠阳
刘贵民
闫涛
刘明
杜林飞
HUI Yang;LIU Gui-min;YAN Tao;LIU Ming;DU Lin-fei(Academy of Army Armored Forces,Beijing 100072,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第10期196-205,共10页
Surface Technology
基金
北京市自然科学基金(2152031)
国家质量监督管理总局福利项目(2011IK260)~~
关键词
超音速等离子喷涂
Mo涂层
载流摩擦磨损
滑动频率
摩擦系数
磨损率
supersonic plasma spraying
Mo coating
current-carrying friction and wear
sliding frequency
friction coefficient
wear rate
