Tribological Performance Evaluation of Greases on a Four-Ball Tester with Graphene Oxide Nanoparticles

Abstract

Conventional greases have an exceptional place in the field of lubrication. They are unique in the sense of their areas of application and are very difficult to replace with other lubricating substances for the same reason. The advancements in the field of nanoparticles and the results they provide as an additive in greases have great scientific interest as they improve the tribological properties of greases to a great extent. The current work's aim is to synthesize a nanogripe using graphene oxide (GO) nanoparticles to lithium grease (Li grease), which will increase the tribological properties of the plain Li grease. Steps were taken to investigate the impact of variation of load on the frictional and wear characteristics of nanogrease. Synthesis of nanogrease and tribological evaluation were performed with a magnetic stirrer with a hot plate and a four-ball tester. Results indicated that nanogrease exhibits better tribological properties. It is also found that the antiwear and frictional properties of grease are not proportional to the wt % of GO nanoparticles. It is also detected that with the increase in load, the tribological properties of nanogrease increase.

Tribological Properties and Lubrication Mechanisms of Water-Based Nanolubricants Containing TiO2 Nanoparticles during Micro Rolling of Titanium Foils

“…The lubrication mechanisms of nanoparticles in the water-based nanolubricants have been systematically explored during past decades. At present, four lubrication mechanisms, that is, the rolling effect [ 37 ], the polishing effect [ 38 ], the tribo-film effect [ 39 ], and the mending effect [ 40 ], have been widely recognized. Figure 10 shows the diagram of the mentioned mechanisms.…”