弹流润滑状态下热可逆超分子凝胶润滑剂成膜机制的研究  

Film Forming Mechanism of Thermoreversible Supramolecular Gel Lubricant for Elastohydrodynamic Lubrication

作　　者：范琳 王永强 陈强 刘骁 郭平霞 杨淑燕[1] 蔡美荣 白艳艳 周峰[2,3] FAN Lin;WANG Yongqiang;CHEN Qiang;LIU Xiao;GUO Pingxia;YANG Shuyan;CAI Meirong;BAI Yanyan;ZHOU Feng(School of Mechanical Engineering,Qingdao University of Technology,Shandong Qingdao 266520,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Shandong Yantai 264006,China)

机构地区：[1]青岛理工大学机械工程学院,山东青岛266520 [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 [3]烟台先进材料与绿色制造山东省实验室,山东烟台264006

出　　处：《摩擦学学报（中英文）》2024年第5期585-596,共12页Tribology

基　　金：国家重点研发计划项目(2021YFA0716304);国家自然科学基金项目(21972153,U21A20280);山东省自然科学基金项目(ZR2022ZD09);泰山学者工程资助。

摘　　要：轴承和齿轮等机械部件在平稳运转过程中处于弹流润滑状态,研究超分子凝胶润滑剂在弹流润滑状态下的润滑性能具有重要意义.主要研究了热可逆超分子凝胶润滑剂在弹流条件下的摩擦学性能,采用同步热分析仪和差示扫描量热仪分析了超分子凝胶润滑剂的相转变温度和热分解温度,证明该凝胶润滑剂具有良好的热学稳定性.采用流变仪分析了超分子凝胶润滑剂的流变学性能,证明该凝胶润滑剂具有良好的机械稳定性和触变性.通过光弹流润滑油测量仪研究了超分子凝胶润滑剂在弹流润滑条件下速度、载荷以及浓度对成膜机制的影响.结果表明:膜厚随着速度增大而增加,随着载荷增大而减小;乏油时间随着载荷和浓度增大而增加.通过微牵引力测定仪研究了载荷、滑滚比和温度对Stribeck曲线的影响,结果表明载荷越大摩擦系数越大,滑滚比越大摩擦系数越大,温度升高摩擦系数减小.试验证明超分子凝胶润滑剂具有比基础油和锂基脂更优异的摩擦学性能,是1种具有潜在应用价值的新型润滑剂.Mechanical components such as bearings and gears that are in an elastofluidic lubrication condition during smooth operation which were widely used in daily machinery and equipment operation.Therefore,the close examination of the lubrication performance was necessary for thermoreversible supramolecular gel lubricants under elastofluidic lubrication condition.The tribological characteristics of thermoreversible supramolecular gel lubricants with temperature-responsive properties under elastofluidic conditions were predominantly studied in this manuscript.When heated,the supramolecular gel lubricant transformed from a gel to a flowing sol and returns to a gel state when cooled.The thermal stability of thermoreversible supramolecular gel lubricants were determined using synchronous thermal analyzers(TGAs)and differential scanning calorimeters(DSCs).The gel lubricantswere thermally stable,as shown by the sol-gel transition temperature and thermal decomposition temperature values for thermoreversible supramolecular gel lubricants compared with base oils(500SN).The rheological properties of thermoreversible supramolecular gels under different shear stress and temperature were characterized by Rheometer(Anton Paar MCR302).The results showed that the thermoreversible supramolecular gellubricants demonstrated good mechanical,thermal stability and thixotropy.As the shear force increased,the viscosity of thermoreversible supramolecular gel lubricants decreased,releasing the lubricants bound in the three-dimensional network structure and bringing the shear rate back to the original state to prevent creeping or leaking of the lubricants.A photoelastic flow lubricant meter was used to investigate the actions of speed,load of frictional conditions and glue-forming concentration on the oil film formation mechanism of the thermoreversible supramolecular gel lubricants under elastofluid lubrication condition.According to the results,the oil film thickness of thermoreversible supramolecular gel lubricants increased with increasing s

关 键 词：超分子凝胶润滑剂 弹流润滑 流变学性能 摩擦学性能 

分 类 号：TH117.2[机械工程—机械设计及理论]