Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Here we examine the elasticity, hardness, and resistance-to-plastic-deformation (P/S2) 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/S2 ratio tends to reduce friction and improve wear protection, which is in an opposite trend as reported for bulk materials. Ultimately, this is likely attributable to the dynamic, self-healing characteristics of tribofilms.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1247932
- Alternate ID(s):
- OSTI ID: 1359969
- Journal Information:
- Wear, Vol. 354-355, Issue C; ISSN 0043-1648
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Material‐Dependent Antagonistic Effects between Soot and ZDDP
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Tribotronic control of friction in oil-based lubricants with ionic liquid additives
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journal | January 2016 |
Ionic Liquid Additives for Mixed and Elastohydrodynamic Lubrication
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journal | April 2018 |
Industrial Gear Oils: Tribological Performance and Subsurface Changes
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journal | April 2018 |
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