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Improvement in the Tribological Performance of Room Temperature Ionic Liquids by Additive Technology
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-0851-8475
AC2T Research GmbH, Wiener-Neustadt, Austria.
IK4-Tekniker, Eibar, Spain.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-8972-2944
2016 (English)In: Nordic Symposium on Tribology - NORDTRIB 2016, Hämeenlinna, Finland, 2016Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Room temperature ionic liquids (RTILs) have interesting properties such as thermal stability, low volatility, and non-flammability. Most research on RTIL lubricants regard RTILs composed of fluorine-containing anions. In metal-metal contacts, these fluids form boundary films of iron fluoride which reduces friction and wear to some extent, but on the other hand cause corrosion under humid conditions. Additives are one way of improving RTIL performance, however; most additives are designed for conventional petroleum base oils, and are therefore hardly miscible with RTILs. In order to improve the performance of RTILs, halogen-free and additive compatible RTILs have recently been developed as potential base oils for advanced lubricants. In this work, RTILs based on phosphonium cations and silylalkyl-sulfonate anions have been evaluated. These fluids are halogen-free and hydrophobic, showing good results in Cu-corrosion testing. Five RTILs, prepared from different anion-cation combinations, were evaluated in steel-steel tribotest. Compared as neat fluids, the RTILs performed superior to perfluoropolyether (PFPE) -based reference lubricant in terms of wear and friction reduction. In the attached figure, it can be seen that the mean friction coefficient is significantly lower for the neat RTIL samples at both 100 and 150 N. Regarding wear volume; the results show that the investigated RTILs produce better protection against wear and are robust to increased load. The tribological performance of RTILs is further improved when adding friction modifying and anti-wear agents designed for synthetic lubricants. This excellent tribological performance, in combination with the inherently persistent nature of ionic liquids demonstrates the high potential as advanced lubricants for these novel RTILs.

Place, publisher, year, edition, pages
Hämeenlinna, Finland, 2016.
Keywords [en]
Tribology, friction, wear, ionic liquids, additive
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-70338OAI: oai:DiVA.org:ltu-70338DiVA, id: diva2:1238163
Conference
17th Nordic Symposium on Tribology - NORDTRIB 2016, Aulanko, Hämeenlinna, Finland, 14–17 June 2016
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-08-14Bibliographically approved

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Nyberg, ErikMinami, Ichiro

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