期刊
WEAR
卷 354-355, 期 -, 页码 78-82出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2016.03.003
关键词
Nanoindentation; Ionic liquid; ZDDP; Tribofilm; Hardness; Resistance-to-plastic-deformation
资金
- Vehicle Technologies Office, Office of Energy Efficiency and Renewable Energy, US Department of Energy (DOE)
- DOE Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Science Undergraduate Laboratory Internships program
- DOE Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Higher Education Research Experience (HERE) program
- U.S. Department of Energy [DE-AC05-00OR22725]
This article examines the elasticity, hardness, and resistance-to-plastic-deformation (P/S-2) measured via nanoindentation of several tribofilms and correlates these properties to friction and wear behavior. The tribofilms were generated by ball-on-plate reciprocating sliding lubricated by a base oil containing an ionic liquid, phosphonium-organophosphate or ammonium-organophosphate, zinc dialkyldithiophosphate (ZDDP), or combination of IL and ZDDP. Nanoindentation was conducted at room and elevated temperatures. While there seems little correlation between the tribofilm hardness and tribological behavior, a higher modulus generally leads to better friction and wear performance. Interestingly, a lower P/S-2 ratio tends to reduce friction and improve wear protection, which is in an opposite trend as reported for bulk materials. This is likely attributable to the dynamic, self-healing characteristics of tribofilms. (C) 2016 Elsevier B.V. All rights reserved.
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