Phosphonium ionic liquids as lubricants for aluminium-steel

Somers, A. E., Howlett, P. C., Sun, J., MacFarlane, D. R. and Forsyth, M. 2010, Phosphonium ionic liquids as lubricants for aluminium-steel, in Tribology & design : Proceedings of the 3rd International Conference on Tribology in Environmental Design 2010, WIT, Southampton, England, pp. 273-284.

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Title Phosphonium ionic liquids as lubricants for aluminium-steel
Author(s) Somers, A. E.
Howlett, P. C.
Sun, J.
MacFarlane, D. R.
Forsyth, M.
Conference name International Conference on Tribology in Environmental Design (3rd : 2010 : Algarve, Portugal)
Conference location Algarve, Portugal
Conference dates 11-13 May, 2010
Title of proceedings Tribology & design : Proceedings of the 3rd International Conference on Tribology in Environmental Design 2010
Editor(s) Hadfield, M.
Seabra, J.
Brebbia, C. A.
Publication date 2010
Series WIT transactions on engineering sciences, 1746-448X ; v. 66.
Conference series International Conference on Tribology in Environmental Design
Start page 273
End page 284
Total pages 12
Publisher WIT
Place of publication Southampton, England
Keyword(s) ionic liquids
phosphonium
phosphorus anions
phenyl rings
lubricants
tribology
wear test
SEM
EDS
Summary The performance of a series of novel room temperature ionic liquids (ILs) based on the trihexyl(tetradecyl)phosphoniumcation (P66614 +) and a number of novel anions have been studied in pin-on-disk tests using a 100Cr6 steel ball on AA2024 aluminium disks.

The anions coupled to the (P66614 +) cation include diphenyl phosphate (DPP-), dibutyl phosphate (DBP-), bis (2,4,4-trimethyl pentyl) phosphinate (M3PPh-) and bis(2-ethyl hexyl) phosphate (BEH-).

More traditional anions such as bis(trifluoromethanesulfonyl) amide (NTf2 -) and bromide (Br-) were also investigated. Experiments were conducted at various loads to assess the IL film forming abilities.

The results suggest that the structure of the anion is important in forming a surface film that reduces the friction and wear of the aluminium disk. At 30N five of the six ILs tested showed a 30-90% reduction in wear, as determined from wear scar depth measurements, compared to fully formulated diesel oil.

The IL lubricant with a diphenyl phosphate anion achieved the lowest wear coefficient, showing a better performance than a typical fluorine-containing IL anion, NTf2.

To further investigate wear mechanisms and surface interactions the wear scars were analysed using a scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS).
ISBN 9781845644406
1845644409
ISSN 1746-448X
Language eng
Field of Research 091205 Functional Materials
091299 Materials Engineering not elsewhere classified
Socio Economic Objective 860603 Lubricants
HERDC Research category E1.1 Full written paper - refereed
Copyright notice ©2010, WIT
Persistent URL http://hdl.handle.net/10536/DRO/DU:30031052

Document type: Conference Paper
Collection: Institute for Technology Research and Innovation
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