Double hybrid lubricant additives consisting of a phosphonium ionic liquid and graphene nanoplatelets/hexagonal boron nitride nanoparticles. (November 2021)

• Record Type: Journal Article
• Authors: Nasser, Khodor I.; Liñeira del Río, José M.; Mariño, Fátima; López, Enriqueta R.; Fernández, Josefa
• Is Part Of: Tribology international. Volume 163(2021)
• Publication Date: 2021-11
• Subjects: Lubricant additive -- Nanomaterials -- Ionic liquids -- Hybrid additives; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2021.107189
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Tribological performance of polyalphaolefin 32, PAO, is investigated by adding two nanomaterials (graphene nanoplatelets, GnP, and hexagonal boron nitride nanoparticles, h-BN) and an ionic liquid ([P6, 6, 6, 14 ][DEHP], IL1, [P2, 4, 4, 4 ][DEP], IL2, or [P6, 6, 6, 14 ][(iC8)2 PO2 ], IL3). Designed double hybrid nanodispersions are PAO/1 wt% ILX/0.05 wt% GnP/0.1 wt% h-BN (X = 1, 2 or 3). The best anti-friction behavior corresponds to PAO/IL3/GnP/h-BN (40% reduction compared to that achieved with PAO). Anti-wear behavior is similar for the three double hybrid nanodispersions. Roughness of the worn surface tested with PAO is higher than that obtained for each of the nanodispersions. Tribo-film formation and repair effect on worn surfaces due to ILs and nanoparticles are revealed. Some positive synergies were found between each IL and GnP/h-BN as hybrid PAO additives. Graphical Abstract: ga1 Highlights: Three ILs combined with h-BN/GnP as hybrid additives of PAO32 were analyzed. PAO/ILX/GnP/h-BN improve the tribological behavior of PAO32 and of single additives. 40% friction reduction with 1 wt% IL3 + 0.1 wt% h-BN + 0.05 wt% GnP added to PAO32. 18% worn area reduction with 1 wt% IL1 + 0.1 wt% h-BN + 0.05 wt% GnP added to PAO32. Tribofilm formation on worn surfaces formed by ILs and/or nanoadditives.