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

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

doi:10.1016/j.wear.2016.03.003

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

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

Surface Engineering and Tribology

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

This article examines 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 combinations 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. In contrast, a lower P/S² 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.

Original language	English
Pages (from-to)	78-82
Number of pages	5
Journal	Wear
Volume	354-355
DOIs	https://doi.org/10.1016/j.wear.2016.03.003
State	Published - May 15 2016

Funding

The authors thank A.E. Marquez Rossy from ORNL and Dr. S. Wang, Y. Meng, and D. Wu from University of Tennessee for training with nanoindentation, Dr. H. Luo from ORNL for synthesizing ILs, and Dr. B.L. Papke from Shell for providing the base oil and ZDDP. This research was sponsored by the Vehicle Technologies Office , Office of Energy Efficiency and Renewable Energy , US Department of Energy (DOE) . This work was supported in part by the DOE Office of Science , Office of Workforce Development for Teachers and Scientists (WDTS) under the Science Undergraduate Laboratory Internships program (Landauer) and Higher Education Research Experience (HERE) program (Barnhill).

Funders	Funder number
Office of Workforce Development for Teachers
U.S. Department of Energy
Office of Science
Office of Energy Efficiency and Renewable Energy

Keywords

Hardness
Ionic liquid
Nanoindentation
Resistance-to-plastic-deformation
Tribofilm
ZDDP

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10.1016/j.wear.2016.03.003

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

abstract = "This article examines 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 combinations 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. In contrast, a lower P/S2 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.",

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AB - This article examines 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 combinations 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. In contrast, a lower P/S2 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.

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

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Keywords

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