Figure 4. The variation of wear rate and wear rate improvement in different weight percentage of graphite and graphene.
Figure 8. The 3D image of the worn surface for graphene oil additives for (a) neat oil, (b) 0.3 wt %, (c) 0.7 wt %, (d) 1 wt %.
Figure 10. The variation of surface roughness of worn surfaces in different (b) graphene weight percentages.
Conclusions
This study suggests that both friction and wear can be dramatically improved in the presence of a solid lubricant (graphite and graphene) as an oil additive for canola oil. The geometry of the graphene and graphite is planar, and can easily slide between the surfaces in the oil. The current investigation was able to achieve the best results for optimum concentration of graphene and graphite in the base oil. Further, an increase in concentration results in aggregation and coagulation of graphene, increasing the wear and friction between surfaces. The worn surfaces exhibited several spots of graphite and graphene that reduce the real contact area and tends to lower COF and wear rate. The worn surfaces were smoother in the presence of graphite and graphene due to lower wear rate. Generally, graphene is more effective than graphite to improve tribological properties because it is in the nano range and can easily penetrate between sliding surfaces.
For more information please refer to the full article (below link)
- This article is an adaptation of “Effect of Micro- and Nano-Sized Carbonous Solid Lubricants as Oil Additives in Nanofluid on Tribological Properties” (on MDPI) by Emad Omrani, Pradeep L. Menezes and Pradeep K. Rohatgi, and is used under a CC-BY-4.0 International license.
https://www.mdpi.com/2075-4442/7/3/25/htm
More reference for nano particle in oil for improvement of tribological properties:
Analysis of Tribological Behavior of Carbon Nanotube Based Industrial Mineral Gear Oil 250 cSt Viscosity
by Shubrajit Bhaumik, S. Prabhu, and Kingsly Jeba Singh, and is used under a CC-BY-3.0 International license.
https://new.hindawi.com/journals/at/2014/341365/
Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties
by Kodanda Rama Rao Chebattina, V. Srinivas, and N. Mohan Rao, and is used under a CC-BY-4.0 International license.