锂离子液体作为钢/铜、钢/铝摩擦副润滑剂的摩擦学性能

Tribological Property of Lithium-based Ionic Liquids as Lubricant for Steel/Copper and Steel/Aluminum Contacts

采用一步法合成了锂离子液体润滑剂[Li(OZO)]TFSI,并选择含有相同阴离子的传统咪唑离子液体1-丁基-3-甲基咪唑双三氟甲烷磺酰亚胺盐(L-F104)作对比,在SRV摩擦磨损试验机上评价了其作为钢/铜、钢/铝润滑剂的润滑性能,用X射线光电子能谱仪(XPS)分析了润滑机理。结果表明:在室温或高温(100℃)条件下,[Li(OZO)]TFSI都具有优异的减摩抗磨性能,摩擦过程中在金属摩擦副表面有物理吸附与摩擦化学反应发生,形成了阻止金属间直接接触的保护膜,从而起到了减摩抗磨的效果;且[Li(OZO)]TFSI可以取代L-F104作为两种摩擦副的润滑剂,而其合成过程却比L-F104简单的多。

Lithium-based ionic liquid （IL, [Li（OZO）]TFSI） was synthesized by one step and evaluated as lu- bricant for steel/copper and steel/aluminum contacts on an Optimol SRV-IV oscillating reciprocating friction and wear tester. The traditional IL 1-butyl-3-methylimidazolium bis（trifluoromethylsulfonyl）imide （L-F104） was used as a contrast. The X-ray photoelectron spectrometer （XPS） analysis was carried out to explore the lubrication mechanism. The results show that [Li（OZO）]TFSI has excellent friction-reducing and anti-wear properties both at room temperature and at 100 ℃. Physical adsorption and tribochemical reactions occur dur- ing the rubbing process with the generation of surface protective films, which prevent the metal-metal contact and further reduce friction and wear. [Li（OZO）]TFSI can substitute for L-F104 to lubricate the two kinds of contacts, and the preparation of the former is simpler than the latter.