温度对PTFE/Kevlar织物复合材料摩擦磨损性能的影响  

The Effect of Temperature on the Friction and Wear Properties of PTFE/Kevlar Fabric Composites

作　　者：李伟博 刘建[1,2] 赵宁波[1,2] 郑晓猛 杜三明 上官宝[1,2] 张永振[1,2] LI Weibo;LIU Jian;ZHAO Ningbo;ZHENG Xiaomeng;DU Sanming;SHANG GUAN Bao;ZHANG Yongzhen(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Henan Luoyang 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Henan Luoyang 471023,China)

机构地区：[1]河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室,河南洛阳471023 [2]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《摩擦学学报（中英文）》2024年第10期1374-1382,共9页Tribology

基　　金：中原学者工作站资助项目(234400510020);河南省重点研发与推广专项(232102221025)资助。

摘　　要：为了探究不同温度下复合材料摩擦系数、磨损率的转变以及材料摩擦磨损行为和损伤机制的演变规律,将制备的PTFE/Kevlar织物复合材料,在不同温度(25~150℃)、载荷(20~40 MPa)和频率(6~10 Hz)下进行往复式摩擦磨损试验.试验结果表明:载荷与频率对复合材料摩擦磨损性能的影响远小于环境温度,随着环境温度的升高,摩擦系数和磨损率呈现先减小后增大的趋势,温度为75℃时材料的摩擦系数和磨损率最小.当环境温度、载荷和频率分别为75℃、30 MPa和6 Hz时,复合材料的摩擦系数约为0.039,磨损率约为5.98×10^(-15)m^(3)/(N·m).随着温度升高至100℃以上,材料摩擦系数和磨损率急剧增大且摩擦系数出现剧烈波动.使用扫描电镜(SEM)和X射线能谱(EDS)对复合材料、转移膜和磨屑进行深入分析发现,复合材料的磨损行为与PTFE纤维的断裂行为有关.随着环境温度的逐渐升高,PTFE纤维断裂行为由滑动剪切挤出逐渐转变为纤维拔出、切断和疲劳剥落.复合材料的磨损机制,由磨粒磨损转变为轻微黏着磨损,再转变为严重的黏着磨损并伴随着热复合型的疲劳磨损.Self-lubricating fabric composites are the key materials in self-lubricating joint bearings,however,during the friction process,high temperature and high speed working conditions,the large accumulation of frictional heat leads to a significant decrease in the overall stability of the composites.It is of great significance to explore the transformation of friction coefficient and wear rate of composites under different temperatures and the evolution of material friction and wear behavior and damage mechanism to improve the self-lubricating performance and wear life of spherical plain bearings.In this paper,the prepared PTFE(Polytetrafluoroethylene)/Kevlar fabric composites were subjected to reciprocating friction and wear tests at different temperatures(25~150℃),loads(20~40 MPa),and frequencies(6~10 Hz)by using a heavy-duty reciprocating friction and wear tester.The test results showed that the change of load and frequency had much less effect on the composites than the temperature.The change of frequency could be defined as the change of friction temperature.At 25℃,the friction coefficient and wear rate of the material decreased gradually with the increase of frequency from 6~10 Hz.As the load increased from 20 MPa to 40 MPa,the friction coefficient and wear rate of the material first decreased and then increased.However,when the temperature started to act,as the temperature increased from 25℃to 150℃,the friction coefficient and wear rate of the composite material showed a tendency of decreasing and then increasing under the influence of temperature.When the temperature was 75℃,the composites showed excellent friction and wear performance,and their friction coefficient and wear rate reached the minimum value.When the ambient temperature,load and frequency were 75℃,30 MPa and 6 Hz,the friction coefficient of the composite material was about 0.039 and the wear rate was about 5.98×10^(-15)m^(3)/(N·m).As the temperature increased above 100℃,the material friction coefficient and wear rate increased dra

关 键 词：织物复合材料 温度 树脂 转移膜 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]