The beneficial effect of graphene nanofillers on the tribological performance of ceramics

The tribological properties of graphene nanoplatelets (GNPs)/Si3N4 composites are investigated for the first time using a reciprocating ball-on-plate configuration under isooctane lubrication. The role of these carbon nanostructures is studied through the analysis of the debris and wear tracks by micro-Raman spectroscopy. GNPs are excellent nanofillers for enhancing the tribological performance of ceramics. Under high contact pressures, GNPs are able to reduce friction and, especially, to increase the wear resistance up to 56% due to the exfoliation of the nanoplatelets that creates an adhered protective tribofilm. These composites are promising for their use in gasoline direct injection systems.