Tribological Improvement Using Ionic Liquids as Additives in Synthetic and Bio-Based Lubricants for Steel–Steel Contacts

Syahir, AZ; Zulkifli, NWM; Masjuki, HH; Kalam, MA; Harith, MH; Yusoff, MNAM; Zulfattah, ZM; Jamshaid, M

Tribological Improvement Using Ionic Liquids as Additives in Synthetic and Bio-Based Lubricants for Steel–Steel Contacts

Syahir, AZ Zulkifli, NWM Masjuki, HH Kalam, MA Harith, MH Yusoff, MNAM Zulfattah, ZM Jamshaid, M

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Publisher:: TAYLOR & FRANCIS INC
Publication Type:: Journal Article
Citation:: Tribology Transactions, 2020, 63, (2), pp. 235-250
Issue Date:: 2020-03-03

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Field	Value	Language
dc.contributor.author	Syahir, AZ
dc.contributor.author	Zulkifli, NWM
dc.contributor.author	Masjuki, HH
dc.contributor.author	Kalam, MA
dc.contributor.author	Harith, MH
dc.contributor.author	Yusoff, MNAM
dc.contributor.author	Zulfattah, ZM
dc.contributor.author	Jamshaid, M
dc.date.accessioned	2022-10-30T20:37:08Z
dc.date.available	2022-10-30T20:37:08Z
dc.date.issued	2020-03-03
dc.identifier.citation	Tribology Transactions, 2020, 63, (2), pp. 235-250
dc.identifier.issn	1040-2004
dc.identifier.issn	1547-397X
dc.identifier.uri	http://hdl.handle.net/10453/162967
dc.description.abstract	This study investigates the performance of three ionic liquids (ILs), trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, trihexyl(tetradecyl)phosphonium decanoate, and 1-butyl-3-methylimidazolium tetrafluoroborate, as lubricant additives in synthetic oil polyalphaolefin (PAO8) and bio-based oil trimethylolpropane trioleate (TMPTO). The ILs were added at 0.5, 1.0, and 1.5 wt% concentrations and evaluated in terms of their miscibility with base oils as well as friction- and wear-reducing abilities. Four-ball and high-frequency reciprocating rig (HFRR) tribotesters were employed to evaluate the tribological performance under a boundary lubrication regime. Worn steel surfaces were characterized using optical microscopy, profilometry, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. The results suggested that the addition of trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate and trihexyl(tetradecyl)phosphonium decanoate improved the tribological performance of both PAO8 and TMPTO at an optimum concentration of 1 wt%. They showed good friction reduction, lower overall surface wear, and improved surface finishing. 1-Butyl-3-methylimidazolium tetrafluoroborate managed to improve the tribological performance of both base oils only at 0.5 wt%. A further increase in 1-butyl-3-methylimidazolium tetrafluoroborate concentration caused detrimental effects on the steel surface due to the formation of halogenic compounds.
dc.language	English
dc.publisher	TAYLOR & FRANCIS INC
dc.relation.ispartof	Tribology Transactions
dc.relation.isbasedon	10.1080/10402004.2019.1679934
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0913 Mechanical Engineering
dc.subject.classification	Mechanical Engineering & Transports
dc.title	Tribological Improvement Using Ionic Liquids as Additives in Synthetic and Bio-Based Lubricants for Steel–Steel Contacts
dc.type	Journal Article
utslib.citation.volume	63
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2022-10-30T20:37:05Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	63
utslib.citation.issue	2

Abstract:

This study investigates the performance of three ionic liquids (ILs), trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, trihexyl(tetradecyl)phosphonium decanoate, and 1-butyl-3-methylimidazolium tetrafluoroborate, as lubricant additives in synthetic oil polyalphaolefin (PAO8) and bio-based oil trimethylolpropane trioleate (TMPTO). The ILs were added at 0.5, 1.0, and 1.5 wt% concentrations and evaluated in terms of their miscibility with base oils as well as friction- and wear-reducing abilities. Four-ball and high-frequency reciprocating rig (HFRR) tribotesters were employed to evaluate the tribological performance under a boundary lubrication regime. Worn steel surfaces were characterized using optical microscopy, profilometry, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. The results suggested that the addition of trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate and trihexyl(tetradecyl)phosphonium decanoate improved the tribological performance of both PAO8 and TMPTO at an optimum concentration of 1 wt%. They showed good friction reduction, lower overall surface wear, and improved surface finishing. 1-Butyl-3-methylimidazolium tetrafluoroborate managed to improve the tribological performance of both base oils only at 0.5 wt%. A further increase in 1-butyl-3-methylimidazolium tetrafluoroborate concentration caused detrimental effects on the steel surface due to the formation of halogenic compounds.

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http://hdl.handle.net/10453/162967