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Tribological Performance of Non-halogenated Phosphonium Ionic Liquids as Additives to Polypropylene and Lithium-Complex Greases
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).ORCID-id: 0000-0002-7413-2220
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.).ORCID-id: 0000-0002-5053-2721
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinkonstruktion (Avd.). Univ Tokyo, Dept Mech Engn, Tokyo 1138656, Japan.
Axel Christiernsson Int AB, S-44911 Nol, Sweden..
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2020 (engelsk)Inngår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 68, nr 1, artikkel-id 3Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
SPRINGER/PLENUM PUBLISHERS , 2020. Vol. 68, nr 1, artikkel-id 3
Emneord [en]
Ionic liquid lubrication, Non-halogenated ionic liquids, Polypropylene grease, Lithium-complex grease
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Identifikatorer
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

Tilgjengelig fra: 2019-12-10 Laget: 2019-12-10 Sist oppdatert: 2019-12-10bibliografisk kontrollert

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