全氟聚醚羧酸铵离子液体的润滑性能及润滑机理研究  

Lubrication Performance and Mechanism of Perfluoropolyether Carboxylate Ammonium Ionic Liquids

作　　者：韩云燕 乔旦[2] 李谨 凡明锦 冯大鹏[2] HAN Yunyan;QIAO Dan;LI Jin;FAN Mingjin;FENG Dapeng(Shaanxi Key Laboratory of Phytochemistry,College of Chemistry&Chemical Engineering,Baoji University of Arts and Sciences,Shaanxi Baoji 721013,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)

机构地区：[1]宝鸡文理学院化学化工学院陕西省植物化学重点实验室,陕西宝鸡721013 [2]中科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

出　　处：《摩擦学学报》2022年第1期14-25,共12页Tribology

基　　金：陕西省自然科学基础研究计划一般项目(2019JQ-894);陕西省教育厅重点实验室项目(20JS004);国家自然科学基金项目(51675006,51705506)资助。

摘　　要：设计制备了三种全氟聚醚羧酸铵离子液体,在微动振动摩擦磨损试验机上考察了其在不同温度下对钢/铜锡合金以及钢/钢摩擦副的润滑性能,并与全氟聚醚(PFPE)和全氟聚醚羧酸(PFPEC)进行了对比.通过测量接触角表征了所制备离子液体对金属表面的润湿性,通过测试摩擦试验过程中接触电阻的变化分析了摩擦过程中摩擦膜的变化;采用扫描电镜和X射线光电子能谱仪分别对磨斑表面形貌和元素状态进行了表征.结果表明:作为钢/铜锡合金摩擦副的润滑剂时,全氟聚醚羧酸铵离子液体在常温下的润滑性能与PFPE和PFPEC相差不大,但在高温条件下表现出更为优异的减摩抗磨性能;而作为钢/钢摩擦副的润滑剂,其在常温、高温条件下均表现出优于PFPE以及PFPEC的减摩抗磨性能.多种物理化学表征研究表明该类离子液体优异的减摩抗磨性能归因于其在金属表面优异的吸附性能以及稳定摩擦化学反应膜的形成.Perfluoropolyethers(PFPE)is a kind of high performance synthetic lubricant with low volatility,high thermal and oxidation stability,good chemical inertia and insulation performance,as well as a wide range of liquid temperature and excellent viscosity-temperature characteristics.PFPE has been widely used in aerospace,military,nuclear industry,computer disk and other fields.With the rapid development of industrial technology,new requirements have been proposed for the performance of the lubricants.As a result,the common perfluoropolyethers as lubricants gradually cannot work well under the present working conditions.Moreover,it is difficult to improve the lubrication performance of perfluoropolyethers by conventional additives technology due to their poor compatibility with conventional additives.Hence,in order to improve the antifriction and antiwear properties of perfluoropolyethers,researchers focused on modifying their structures.Great efforts have been paid to improve the performance of perfluoropolyethers as lubrication film in the field of computer disk,but as a kind of important aviation lubricating oils,their lubrication performances are also in urgent need of improvement.In this context,in this study three kinds of perfluoropolyether carboxylate ammonium ionic liquids(PF-BA,PF-DBA and PF-TBA)were designed and synthesized by modifying the structure of perfluoropolyether carboxylic acid(PFPEC)with different amines.The structures of synthesized ionic liquids were confirmed by infrared spectroscopy.Their shear stress and viscosity at different shear rates were evaluated by a Rheometer,and the wetting ability on metal surfaces were analyzed by the contact angle.Their lubrication performance for steel/steel and steel/tin bronze friction pairs at 25℃ and 100℃ were evaluated and compared by Optimal SRV-V oscillating friction and wear tester,where PFPE and PFPEC were used as reference samples.And the variation of the tribofilm during the friction process were revealed by the change of contact resistance.The su

关 键 词：全氟聚醚羧酸铵离子液体 铜锡合金 轴承钢 润滑性能 摩擦膜 

分 类 号：TH117.3[机械工程—机械设计及理论]