Lubricant film formation properties of alkyl imidazolium tetrafluoroborate and hexafluorophosphate ionic liquids

被引:32
|
作者
Arora, H. [1 ]
Cann, P. M. [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Tribol Sect, Dept Mech Engn, London SW7 2AZ, England
关键词
Room-temperature ionic liquids (RTIL); EHL film thickness; Boundary lubrication; STEEL-ALUMINUM CONTACTS; TRIBOLOGICAL PERFORMANCE; ADDITIVES; TEMPERATURE; FRICTION; DEVICE; WEAR;
D O I
10.1016/j.triboint.2010.03.011
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The film thickness and friction properties of four imidazolium ionic liquids (1-butyl-3-methyl tetrafluoroborate and hexafluorophosphate and 1-hexyl-3-methyl tetrafluoroborate and hexafluorphosphate) were measured for mixed rolling-sliding conditions and the results compared to an additised mineral oil. Film thickness results showed that three of the fluids demonstrated classical EHL behaviour; however, the 1-butyl-3-methyl fluids gave anomalously thick, time-dependent films at low speeds (< 0.3 m/s). Post-test inspection of the specimens revealed a loosely bound brown film deposited in the track. Film formation appeared to originate in the bulk fluid where brown "fibrous" agglomerations were observed. These were flocculated by shear flow and deposited in the track after passing through the contact. Overall the RTIL friction coefficients were less than the mineral oil for all conditions investigated. In the absence of thick film formation all RTILs gave a similar friction coefficient of 0.03 in the boundary regime, which is thought to be due to electrical double layer formation. In the fluid film regime traction was determined by the nature of the anion. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1908 / 1916
页数:9
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