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Tribological Properties of the Functionalized Graphene/Montmorillonite Nanosheets as a Lubricant Additive

Abstract

The functionalized graphene/montmorillonite (FG/MTT) nanosheet was synthesized through chemical bonding by a simple, green method, which had remarkable dispersion stability in oil and its lubricating performance was evaluated by a four-ball tribometer. The test results showed that FG/MTT had a preeminent lubricant property when the concentration was 0.4 mg/ml. Compared with the bare oil sample, its average friction coefficient (FC) and wear scar diameter (WSD) decreased by 50.4% and 13.2%, respectively. The synergistic effect between FG and MTT was further explored by comparing the lubricant mechanism of the different additives. After synthetically analyzing worn surface by means of scanning electron microscopy and X-ray photoelectron spectroscopy, the lubrication mechanism of the FG/MTT nanocomposite as oil additive was discussed and postulated: the FG/MTT with weak interlayer adhesion was filled between the friction pairs to avoid contact and clinging of some asperities, and the sliding between the layers played a role in lubrication. Furthermore, FG/MTT would react with the surface of the friction pair to form a repair layer composed of Fe2O3, SiC, SiO2, and aluminosilicate, mending the grinding surface and promoting the hardness after friction.

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Acknowledgements

The work was supported by the program for Science and Technology Innovative Research Team in Universities of Jiangsu Province, and the ‘333 Program’ BRA2019262 of Jiangsu Province, China. We also thank the support of the Analysis and Test Center, Nanjing University of Science and Technology, for XRD and Raman data collection.

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Correspondence to Qingli Hao.

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The authors would like to declare that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part, and they declare no competing financial interest

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Li, Y., Yang, R., Hao, Q. et al. Tribological Properties of the Functionalized Graphene/Montmorillonite Nanosheets as a Lubricant Additive. Tribol Lett 69, 117 (2021). https://doi.org/10.1007/s11249-021-01495-x

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Keywords

  • Graphene
  • Tribological properties
  • Lubricant
  • Repairing layer