Investigation on tribological properties of used engine oil with graphene

Abstract

The present work concentrate on the improvement in physico-chemical, and tribological properties of used engine oil using graphene nanoparticles. The used engine oil (15W40) has been collected from heavy earth moving machines (HEMM) of coal mines. The graphene nanoparticles have been used for the preparation of nanolubricants and the properties are compared with unused oil. Kinematic viscosity, viscosity index (VI) and density have been measured to examine the physico-chemical properties of nanolubricants and observe the improvements. The stable chemical structure of nanolubricants has been found with Fourier transform infrared spectroscopy (FTIR). The performance of nanolubricant has been found by measuring wear and friction coefficient between grey cast iron contacts and observed the significant reduction in wear and friction compared to used oil. The same has been validated by measuring the wear scar with the help of optical microscopy and electron dispersive X-ray spectroscopy. The life of the used oil has been enhanced with the addition of nanoparticles.

A review of advances in tribology in 2020–2021

“…Graphene-based materials are typically used as a lubricant additive because of their layered structure, such as GO-Fe 3 O 4 nanohybrids [62], functionalized graphene/montmorillonite (FG/MTT) nanosheet [63], titanium dioxide (TiO 2 ) and graphene(GnP) nanoparticles [64], graphene/ionic liquid (G/IL) composite material [65], graphene modified by octadecylamine and dicyclohexylcarbodiimide [66], detonation nanodiamond and GO [67], graphene nanoparticles [68], graphene/triangular copper nanoplate composites (GN/Cu nanoplates) [69], and nanomaterials graphene nanoplatelets [70], etc.…”

“…Laser textured Ti-6Al-4V alloy implants with bioinspired micro-overlapping structures were adopted to improve cell attachment, proliferation, and osteogenic differentiation as a result of the important role of friction [696]. Although most studies focused on the two main joints of the hip and the knee in the body as discussed above, other smaller joints were also received significant attention including the elbow [697], the wrist [68], the ankle [699], and the temporomandibular joint [700,701]. The role of friction was considered in developing better robotics and exoskeletons [702] as well as neuroprosthesis [703].…”