Phosphonium-based ionic liquids as additives in calcium/lithium greases
Authors: García Tuero, A., Bartolomé, M., Gonçalves, D., Viesca, J.L., Fernández-González, A., Seabra, J.H.O. and Hernández Battez, A.
Journal: Journal of Molecular Liquids
Volume: 338
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2021.116697
Abstract:This work studies the performance of three phosphonium-based ionic liquids ([P6,6,6,14][BEHP], [P6,6,6,14][TCM] and [P6,6,6,14][DEC]) when used separately as additives on the thermal conductivity, thermal stability and tribological properties of two non-additised greases (a lithium-based and a calcium-based grease). The main results confirmed that the [P6,6,6,14][TCM] improved the thermal stability of both greases. Only the mixtures G1 + 5%[P6,6,6,14][BEHP] and G2 + 5%[P6,6,6,14][TCM] showed a slight increase in thermal conductivity. In general, the addition of the ILs to the lithium-based grease increased the friction coefficient in both the four-ball tests and the reciprocating tests, while the friction coefficient decreased with the addition of the ILs to the calcium-based grease in the four-ball tests. The addition of the [P6,6,6,14][BEHP] and [P6,6,6,14][TCM] improved the antiwear behavior of the lithium-based grease under both tribological tests, whereas all the ionic liquids worsened the antiwear behavior of the calcium-based grease in the four-ball tests. The [P6,6,6,14][BEHP] had the best antiwear behavior due to the higher interaction of phosphorous with the metal surface. A possible interference of the calcium thickener with the ionic liquid–metal surface interaction was found, resulting in lower antiwear behavior of the mixtures with the calcium-based grease.
https://eprints.bournemouth.ac.uk/35693/
Source: Scopus
Phosphonium-based ionic liquids as additives in calcium/lithium greases
Authors: Garcia Tuero, A., Bartolome, M., Goncalves, D., Viesca, J.L., Fernandez-Gonzalez, A., Seabra, J.H.O. and Hernandez Battez, A.
Journal: JOURNAL OF MOLECULAR LIQUIDS
Volume: 338
eISSN: 1873-3166
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2021.116697
https://eprints.bournemouth.ac.uk/35693/
Source: Web of Science (Lite)
Phosphonium-based ionic liquids as additives in calcium/lithium greases
Authors: García Tuero, A., Bartolomé, M., Gonçalves, D., Viesca, J.L., Fernandez-Gonzalez, A., Seabra, J.H.O. and Hernandez Battez, A.
Journal: Journal of Molecular Liquids
Volume: 338
Issue: September
ISSN: 0167-7322
Abstract:This work studies the performance of three phosphonium-based ionic liquids ([P6,6,6,14][BEHP], [P6,6,6,14][TCM] and [P6,6,6,14][DEC]) when used separately as additives on the thermal conductivity, thermal stability and tribological properties of two non-additised greases (a lithium-based and a calcium-based grease). The main results confirmed that the [P6,6,6,14][TCM] improved the thermal stability of both greases. Only the mixtures G1 + 5%[P6,6,6,14][BEHP] and G2 + 5%[P6,6,6,14][TCM] showed a slight increase in thermal conductivity. In general, the addition of the ILs to the lithium-based grease increased the friction coefficient in both the four-ball tests and the reciprocating tests, while the friction coefficient decreased with the addition of the ILs to the calcium-based grease in the four-ball tests. The addition of the [P6,6,6,14][BEHP] and [P6,6,6,14][TCM] improved the antiwear behavior of the lithium-based grease under both tribological tests, whereas all the ionic liquids worsened the antiwear behavior of the calcium-based grease in the four-ball tests. The [P6,6,6,14][BEHP] had the best antiwear behavior due to the higher interaction of phosphorous with the metal surface. A possible interference of the calcium thickener with the ionic liquid–metal surface interaction was found, resulting in lower antiwear behavior of the mixtures with the calcium-based grease.
https://eprints.bournemouth.ac.uk/35693/
Source: BURO EPrints