Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations

Landauer, Alexander K.; Barnhill, William C.; Qu, Jun

doi:10.1016/j.wear.2016.03.003

Title: Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations

Journal Article · Thu Mar 10 00:00:00 EST 2016 · Wear

DOI:https://doi.org/10.1016/j.wear.2016.03.003· OSTI ID:1247932

Landauer, Alexander K. ^[1]; Barnhill, William C. ^[1]; Qu, Jun ^[1]

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.

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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

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Cited by: 31 works

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Industrial Gear Oils: Tribological Performance and Subsurface Changes Adebogun, Aduragbemi; Hudson, Robert; Breakspear, Angela Tribology Letters, Vol. 66, Issue 2 https://doi.org/10.1007/s11249-018-1013-2	journal	April 2018

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Title: Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations

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