GF织物增强PTFE复合材料全寿命磨损机理  

Life cycle wear mechanism of GF/PTFE self-lubricating composite

作　　者：刘建[1] 彭帅豪 贺甜甜[1] 逄显娟[1] 上官宝[1] 张永振[1] LIU Jian;PENG Shuaihao;HE Tiantian;PANG Xianjuan;SHANGGUAN Bao;ZHANG Yongzhen(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang 471000,Henan,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471000

出　　处：《材料工程》2023年第11期151-160,共10页Journal of Materials Engineering

基　　金：国家自然科学基金项目(52005160,51905153)。

摘　　要：采用MYB-500高频高压摆动摩擦磨损试验机,对玻璃纤维织物增强聚四氟乙烯(GF/PTFE)自润滑复合材料进行全寿命磨损测试,研究材料自润滑性能和损伤特征,通过微观检测方法分析磨损产物和摩擦表面,探讨影响材料自润滑稳定性和寿命的关键因素。结果表明,GF/PTFE自润滑复合材料的寿命周期具有明显的阶段性特征,根据摩擦因数和磨损厚度变化可分为磨合、稳定及失效三个阶段。摩擦因数和摩擦温度的实时监测能够有效反映材料的自润滑性能及寿命阶段,磨损量的变化及磨损表面的分析则表明材料磨损具有显著的非均匀性。根据材料失效后的表面磨损机理推断,材料初始厚度的不均匀性对其磨损过程中损伤的不一致性及寿命具有关键影响。因此,通过改进固化工艺,能够有效延长材料寿命周期中的稳定阶段,提高材料使用寿命。The glass fiber fabric reinforced polytetrafluoroethylene(GF/PTFE)self-lubricating composite was investigated by using a high frequency and high load oscillating friction and wear tester MYB-500 to carry on a whole life wear test.The self-lubricating performance and damage characteristics were studied,and the wear debris and wear surface were analyzed by microscopic detection method to discuss the key factors affecting the self-lubricating stability and service life of material.Results show that the life cycle of GF/PTFE self-lubricating composite exhibits an obvious stage characteristics,and can be divided into three stages,including running-in,stable stage and failure stage based on the change of friction coefficient and wear depth.Real-time monitoring of friction coefficient and friction temperature can effectively reflect the self-lubricating performance and life stage of the material.The change of wear depth and wear surface analysis show that the wear exhibits notable non-uniformity.According to wear mechanism,the inhomogeneity of the initial thickness of the material has a significant influence on the inconsistency of the damage during the wear process as well as its life.Therefore,by improving the curing process,the stable stage in life cycle can be prolonged and the service life of the material can also be increased.

关 键 词：自润滑 摩擦因数 磨损 聚四氟乙烯 

分 类 号：TH117[机械工程—机械设计及理论]