I think the IL being discussed is in the reference and abstract below. This reference is for steel/steel interfaces, but this group has other papers that deal with other metal interfaces. I think that scale-up of synthesis at a reasonable cost is the primary limit.
Ionic Liquids Based on Phosphonium Cations As Neat Lubricants or Lubricant Additives for a Steel/Steel Contact
Inés Otero †, Enriqueta R. López †, Manuela Reichelt ‡, María Villanueva †, Josefa Salgado †, and Josefa Fernández *†
† Laboratory of Thermophysical Properties of Fluids and Biomaterials, Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
‡ Wilhelm Ostwald Institute for Physical and Theoretical Chemistry, University Leipzig, Linnéstr. 2, 04103 Leipzig, Germany
ACS Appl. Mater. Interfaces, 2014, 6 (15), pp 13115–13128
DOI: 10.1021/am502980m
Publication Date (Web): July 21, 2014
Copyright © 2014 American Chemical Society
*E-mail:
[email protected]. Phone: +34881814046. Fax: +34881814112.
After doing several miscibility essays with eight ionic liquids (ILs) and four base oils, the ILs tri(butyl)ethylphosphonium diethylphosphate [P4,4,4,2][C2C2PO4] and trihexyl(tetradecyl)phosphonium tris(pentafluoroethyl)trifluorophosphate [P6,6,6,14][(C2F5)3PF3] were selected to be studied as lubricant additives. The neat IL [P4,4,4,2][C2C2PO4], the base oils, and several blends were characterized in terms of density, viscosity, and thermal stability. The tribological performance of the miscible base oil/IL blends (1 wt %) and the neat [P4,4,4,2][C2C2PO4] were evaluated for the lubrication of an AISI 420 steel–100Cr6 steel contact pair. The friction coefficients and wear volumes obtained are also compared with those corresponding to the pure base oils and their mixtures with conventional additive zinc dialkyldithiophosphate (ZDDP). As neat lubricants, [P4,4,4,2][C2C2PO4] showed the best antifriction ability, whereas in terms of wear, better results were obtained with [P6,6,6,14][(C2F5)3PF3]. However, higher improvements in both friction and wear were found for blends containing [P4,4,4,2][C2C2PO4]. XPS analyses of the worn surfaces lubricated with these mixtures indicated the presence of phosphorus in the tribofilm formed on the wear track. However, this compound was slightly detected on tribosamples lubricated with blends containing [P6,6,6,14][(C2F5)3PF3].