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Lubricants 2016, 4(3), 30;

The Tribological Properties of Multi-Layered Graphene as Additives of PAO2 Oil in Steel–Steel Contacts

College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China
Authors to whom correspondence should be addressed.
Academic Editor: Robert J. K. Wood
Received: 29 May 2016 / Revised: 24 August 2016 / Accepted: 29 August 2016 / Published: 31 August 2016
(This article belongs to the Special Issue Green Tribology)
Full-Text   |   PDF [7366 KB, uploaded 31 August 2016]   |  


Multi-layered graphene was prepared by supercritical CO2 exfoliation of graphite. As the additives of polyalphaolefin-2 (PAO2) oil, its tribological properties were investigated using four-ball test method. The friction reduction and anti-wear ability of pure lubricant was improved by the addition of graphene. With a favorable concentration, the graphene was dispersive. The PAO2 oil with 0.05 wt % graphene showed better tribological properties than that for the other concentration of graphene additives. It could be used as a good lubricant additive for its excellent tribological characteristics, and the multi-layered graphene can bear the load of the steel ball and prevent direct contact of the mating metal surfaces. However, a higher concentration would cause the agglomeration of graphene and weaken the improvement of tribological properties. View Full-Text
Keywords: graphene; additives; PAO2; lubrication; tribological properties graphene; additives; PAO2; lubrication; tribological properties

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Guo, Y.-B.; Zhang, S.-W. The Tribological Properties of Multi-Layered Graphene as Additives of PAO2 Oil in Steel–Steel Contacts. Lubricants 2016, 4, 30.

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