5. Energy Efficient Graphene Based Nano-composite Grease

Performance of grease lubricated point contact under elasto-hydrodynamics lubrication (EHL) regime is complex and critical in many practical and engineering applications. This article deals with the detailed rheology, film formation and elastic recovery characteristics of the developed nano-composite grease. The composite grease is prepared by dispersing the reduced graphene oxide nano-sheets to bare grease. The detailed microstructural morphology of the nano-additives and different grease samples is evaluated using high resolution transmission electron microscopy (HRTEM). The rotational rheometer under oscillatory mode is used to evaluate the storage (G’) and loss moduli (G”). The film formation is recorded using elasto-hydrodynamic rig for range of speed at constant load and different temperatures. The results shows that modification in microstructure due to dispersion of reduced graphene oxide (rGO) nano-sheets, improves the rheological and tribological behavior. Based on film formation and recovery or reflow characteristics, the rGO dispersed composite grease is efficient. The rGO dispersed composite grease registers 92% of elastic recovery.