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Lubrication mechanism of hydrocarbon-mimicking ionic liquids
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. (Machine Elements)ORCID iD: 0000-0002-0851-8475
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2017.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keyword [en]
P-SiSO, boundary film, silicate, friction, wear, anti-wear, friction modifier, base fluid
National Category
Tribology
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-65505ISBN: 978-91-7583-953-0 (print)ISBN: 978-91-7583-954-7 (electronic)OAI: oai:DiVA.org:ltu-65505DiVA: diva2:1138567
Presentation
2017-11-02, E231, Luleå tekniska universitet, Luleå, 09:00 (English)
Supervisors
Projects
Projekt: Rymdforskarskolan 2015
Available from: 2017-09-06 Created: 2017-09-05 Last updated: 2017-09-06Bibliographically approved
List of papers
1. Molecular design of advanced lubricant base fluids: hydrocarbon-mimicking ionic liquids
Open this publication in new window or tab >>Molecular design of advanced lubricant base fluids: hydrocarbon-mimicking ionic liquids
2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 11, 6364-6373 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes the molecular design and tribological evaluation of novel room-temperature ionic liquid (RTIL) lubricants{,} abbreviated as P-SiSOs. The RTILs are designed to mimic hydrocarbons{,} in order to ensure their compatibility with existing tribosystems as well as enable use of conventional additives. Steel-on-steel ball-on-flat reciprocating tribotests performed under atmospheric conditions show that the neat P-SiSOs exhibit favorable performances{,} resulting in friction and wear significantly lower than those in the case of the perfluoropolyether lubricants used as references. Tribotests performed at elevated loads and temperatures indicate the formation of friction-reducing boundary films of the neat P-SiSOs. The tribological performance of the P-SiSO is improved further by the incorporation of additives conventionally used in hydrocarbon oils. When used in a concentration of 5 wt%{,} the additives glycerol monooleate{,} dibenzyl disulfide{,} and oleylamine improve the tribological characteristics of P-SiSO. These results indicate that molecular-designed hydrocarbon-mimicking RTIL lubricants can exhibit suitable performances in the neat form and that their performances can be improved further by using conventional additives{,} as in the case of hydrocarbon base oil-additive systems.

Place, publisher, year, edition, pages
RSC Publishing, 2017
Keyword
additive compatibility, synthetic lubricant, friction modification, wear prevention, tetraalkylphosphonium, RTIL
National Category
Tribology
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-61571 (URN)10.1039/C6RA27065D (DOI)000393755100024 ()2-s2.0-85010341504 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-02-07 (andbra)

Available from: 2017-01-21 Created: 2017-01-21 Last updated: 2017-09-05Bibliographically approved
2. Formation of Boundary Film from Ionic Liquids Enhanced by Additives
Open this publication in new window or tab >>Formation of Boundary Film from Ionic Liquids Enhanced by Additives
2017 (English)In: Applied Sciences, ISSN 2076-3417, Vol. 7, no 5, 433Article in journal (Refereed) Published
Abstract [en]

Room temperature ionic liquids (RTILs) have several properties that make them interesting candidates as base fluids for extreme conditions. However, a lack of compatibility with tribo-improving additives combined with an often overly aggressive nature is limiting their use as base fluids. To overcome these drawbacks, hydrocarbon-imitating RTIL base fluids have recently been developed. In this study, the effects of several common additives in the novel RTIL (P-SiSO) were examined by laboratory tribotesting. A reciprocating steel-steel ball-on-flat setup in an air atmosphere was used, where the lubricant performance was evaluated over a range of loads and temperatures. Surface analyses after testing were carried out using optical profilometry, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Neat P-SiSO displayed high performance in the tribotests. At an elevated load and temperature, a shift in lubrication mode was observed with an accompanying increase in friction and wear. Surface analysis revealed a boundary film rich in Si and O in the primary lubrication mode, while P was detected after a shift to the secondary lubrication mode. An amine additive was effective in reducing wear and friction under harsh conditions. The amine was determined to increase formation of the protective Si–O film, presumably by enhancing the anion activity.

Place, publisher, year, edition, pages
MDPI AG, 2017
Keyword
gränsskiktssmörjning, jonvätska, friktion, nötning, tribologi
National Category
Tribology Chemical Process Engineering
Research subject
Machine Elements; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-63211 (URN)10.3390/app7050433 (DOI)000404449000002 ()2-s2.0-85018920929 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-05-10 (rokbeg)

Available from: 2017-05-02 Created: 2017-05-02 Last updated: 2017-09-05Bibliographically approved

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