含膦酸酯官能团离子液体对钢/铝摩擦副的润滑作用研究  

Lubricity of Ionic Liquids Containing Phosphonate Functional Groups as Lubricants for Aluminum-on-Steel Contact

作　　者：牟宗刚[1] 梁永民[1] 张书香[2] 王海忠[1] 刘维民[1] 

机构地区：[1]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 [2]济南大学化学化工学院,山东济南250022

出　　处：《摩擦学学报》2004年第4期294-298,共5页Tribology

基　　金：国家自然科学基金资助项目(50275142);科技部"863"资助项目(2002AA302609).

摘　　要：合成了3种新型1-(O,O-二乙基膦酰丙基)-3-烷基咪唑六氟磷酸盐离子液体,采用SRV型摩擦磨损试验机评价了所制备的离子液体作为润滑剂对钢/铝摩擦副摩擦学性能的影响,并探讨了其润滑机理.结果表明,所合成的离子液体作为润滑剂对钢/铝摩擦副具有优良的润滑作用,摩擦系数低,抗磨性能优良.表面分析结果表明含膦酸酯官能团的离子液体在摩擦副接触表面形成化学吸附边界润滑膜,从而有效地起到抗磨和提高承载能力的作用.A series of functional room-temperature ionic liquids (RTILs) of 1-(O,O-diethyl phosphonyl-n-propyl)-3-alkylimidazolium hexafluorophosphate was prepared and evaluated as a kind of promising lubricant for aluminum-on-steel contact. The viscosity and density of the synthetic RTILs were measured. The glass transition temperature and the heat capacity jump associated with the transition from the non-equilibrium glass to the metastable supercooled liquid were analyzed. The lubricity of the synthetic RTILs as the lubricants for a aluminum-on-steel contact was comparatively investigated by SRV test rig in a ball-on-disc configuration, using conventional ionic liquid l-propyl-3-octylimidazolium hexafluorophosphate (coded as LP308) to compare. The worn Al alloy surfaces lubricated with different media were observed on a scanning electron microscope, while the chemical states of some typical elements in the neat synthetic ionic liquids and on the worn Al surface lubricated therewith were analyzed by means of X-ray photoelectron spectroscopy. It was found that the synthetic ionic liquids show higher viscosity than LP308. The synthetic ionic liquids have excellent friction-reducing and antiwear ability to the aluminum-on-steel contact and are superior to phosphazene (X-1P) in terms of the friction-reduction ability and load-carrying capacity, attributed to the formation of chemical adsorption and tribo-chemical reaction boundary film on the worn surface during sliding process. Of the three synthetic ionic liquids, [DPPOIM] [PF6] shows the best lubricity and antiwear ability for the aluminum-on-steel system.

关 键 词：离子液体 1-(O O-二乙基膦酰丙基)-3-烷基咪唑六氟磷酸盐 润滑剂 摩擦学性能 

分 类 号：O634.51[理学—高分子化学] TH117.3[理学—化学]