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

Here we examine 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. Ultimately, this is likely attributable to the dynamic, self-healing characteristics of tribofilms.
Authors:
 [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Wear
Additional Journal Information:
Journal Volume: 354-355; Journal Issue: C; Journal ID: ISSN 0043-1648
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; nanoindentation; ionic liquid; ZDDP; tribofilm; hardness; resistance-to-plastic-deformation
OSTI Identifier:
1247932
Alternate Identifier(s):
OSTI ID: 1359969

Landauer, Alexander K., Barnhill, William C., and Qu, Jun. Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations. United States: N. p., Web. doi:10.1016/j.wear.2016.03.003.
Landauer, Alexander K., Barnhill, William C., & Qu, Jun. Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations. United States. doi:10.1016/j.wear.2016.03.003.
Landauer, Alexander K., Barnhill, William C., and Qu, Jun. 2016. "Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations". United States. doi:10.1016/j.wear.2016.03.003. https://www.osti.gov/servlets/purl/1247932.
@article{osti_1247932,
title = {Correlating mechanical properties and anti-wear performance of tribofilms formed by ionic liquids, ZDDP and their combinations},
author = {Landauer, Alexander K. and Barnhill, William C. and Qu, Jun},
abstractNote = {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.},
doi = {10.1016/j.wear.2016.03.003},
journal = {Wear},
number = C,
volume = 354-355,
place = {United States},
year = {2016},
month = {3}
}