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Open AccessArticle

Effect of Micro- and Nano-Sized Carbonous Solid Lubricants as Oil Additives in Nanofluid on Tribological Properties

1
Department of Materials Science and Engineering, College of Engineering & Applied Science, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
2
Department of Mechanical Engineering, University of Nevada-Reno, Reno, NV 89557, USA
*
Author to whom correspondence should be addressed.
Lubricants 2019, 7(3), 25; https://doi.org/10.3390/lubricants7030025
Received: 28 January 2019 / Revised: 21 February 2019 / Accepted: 7 March 2019 / Published: 15 March 2019
The tribological behavior of graphene and graphite as additives in canola oil was investigated with a pin-on-disk tribometer. The wear surfaces of the aluminum pins lubricated with the additive-containing canola oil were analyzed by scanning electron microscopy (SEM). It was found that graphene and graphite as additives in oil show a lower coefficient of friction and wear rate in comparison with neat canola oil. The graphene sheets are more effective than graphite flakes to reduce friction and wear. In addition, there is a proper concentration where the coefficient of friction (COF) and wear are in minimum value. The optimal concentration of the additive in canola oil is about 0.7 wt %. Therefore, the load-carrying capacity and antiwear ability of the lubricating oil are improved. Moreover, the worn surface of aluminum pins is smother in the presence of solid lubricant rather than neat oil. View Full-Text
Keywords: graphene; graphite; oil additives; tribology; wear graphene; graphite; oil additives; tribology; wear
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Omrani, E.; Menezes, P.L.; Rohatgi, P.K. Effect of Micro- and Nano-Sized Carbonous Solid Lubricants as Oil Additives in Nanofluid on Tribological Properties. Lubricants 2019, 7, 25.

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