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Tribological Performance of Non-halogenated Phosphonium Ionic Liquids as Additives to Polypropylene and Lithium-Complex Greases
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).ORCID iD: 0000-0002-7413-2220
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).ORCID iD: 0000-0002-5053-2721
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Univ Tokyo, Dept Mech Engn, Tokyo 1138656, Japan.
Axel Christiernsson Int AB, S-44911 Nol, Sweden..
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2020 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 68, no 1, article id 3Article in journal (Refereed) Published
Abstract [en]

Four non-halogenated ionic liquids (ILs) with trihexyl(tetradecyl)phosphonium cation are tested as lubricant additives to polypropylene (PP) and lithium-complex (LiX) greases. In pin-on-disk tests at elevated temperatures, the addition of an IL with bis(oxalato)borate ([BOB]) anion reduces wear by up to 50% when compared to the neat LiX base grease; an IL with bis(mandelato)borate ([BMB]) anion reduces friction by up to 60% for both PP and LiX. Elemental analysis reveals that oxygen-rich tribofilms help to reduce wear in case of [BOB], while the friction reduction observed for [BMB] is likely caused by adsorption processes. We find that temperature has a pronounced effect on additive expression, yet additive concentration is of minor importance under continuous sliding conditions. In contrast, rolling-sliding experiments at 90 degrees C show that the traction performance of LiX grease is dependent on additive concentration, revealing a reduction in traction by up to 30 and 40% for [BMB]- and [BOB]-containing ILs at concentrations of 10 wt%. Finally, an IL with dicyanamide anion reduces friction and increases wear in pin-on-disk tests at room temperature, while an IL with bis-2,4,4-(trimethylpentyl)phosphinate anion increases wear, showing only limited potential as grease additives. Overall, this work demonstrates the ability of non-halogenated ILs to significantly extend grease performance limits.

Place, publisher, year, edition, pages
SPRINGER/PLENUM PUBLISHERS , 2020. Vol. 68, no 1, article id 3
Keywords [en]
Ionic liquid lubrication, Non-halogenated ionic liquids, Polypropylene grease, Lithium-complex grease
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:kth:diva-264851DOI: 10.1007/s11249-019-1240-1ISI: 000496696800001Scopus ID: 2-s2.0-85075213059OAI: oai:DiVA.org:kth-264851DiVA, id: diva2:1376950
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QC 20191210

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved

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Tian, YiyuanYoshikawa, SosakuGlavatskih, Sergei

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