Double hybrid lubricant additives consisting of a phosphonium ionic liquid and graphene nanoplatelets/hexagonal boron nitride nanoparticles

• Published in: Tribology international 2021-11, Vol.163, p.107189, Article 107189
• Main Authors: Nasser, Khodor I., Liñeira del Río, José M., Mariño, Fátima, López, Enriqueta R., Fernández, Josefa
• Format: Article
• Language: English
• Subjects: Additives; Boron nitride; Graphene; Hybrid additives; Ionic liquids; Ions; Lubricant additive; Lubricants; Nanomaterials; Nanoparticles; Tribology
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2021.107189

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)2PO2], 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. [Display omitted] •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.