Antiwear performance of ionic liquid+graphene dispersions with anomalous viscosity-temperature behavior

Journal ar
Tribology International
  • Volumen: 122
  • Fecha: 01 June 2018
  • Páginas: 200-209
  • ISSN: 0301679X
  • Source Type: Journal
  • DOI: 10.1016/j.triboint.2018.02.020
  • Document Type: Article
  • Publisher: Elsevier Ltd
© 2018 Elsevier Ltd New dispersions of few-layers graphene (G) in 1-ethyl-3-methylimidazolium ([EMIM]) ionic liquids (ILs) with dicyanamide ([DCA]) or bis(trifluoromethylsulfonyl)imide ([TFSI]) anions have been obtained by mechanical mixing and sonication. IL+0.5 wt% G dispersions show constant viscosity values from 357K (for IL = [EMIM][DCA]) or from 385K (for IL = [EMIM][TFSI]) to 393K. IL + G dispersions with G > 0.5 wt% show linear viscosity increases with increasing temperature, from 306K (for [EMIM][DCA]+1 wt%G) and from 330K to 393K (for [EMIM][TFSI]+0.75 wt%G and [EMIM][TFSI]+1 wt%G). Addition of graphene improves the poor wear reducing performance of [EMIM][DCA], and prevents surface damage on steel when added to [EMIM][TFSI]. Graphene increases the load-carrying ability of ILs, forms a surface layer on the sliding path and retains wear debris, preventing the formation of large abrasive particles.

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