Abstract
The oleylamine (OA)-modified carbon nanoparticles (CPs-OA) with particle sizes of 25–35 nm were synthesized by a facile one-pot pyrolysis method. As the OA molecules were covalently attached on the surfaces of CPs-OA, the CPs-OA exhibited good dispersibility in polyalphaolefin (PAO). Then the tribological behaviors of CPs-OA as the lubricating additives of PAO were investigated in detail. Under the four-ball mode and the load of 392 N, the CPs-OA showed the best friction-reducing and antiwear properties at the optimal concentration of 1.0 wt%. Specifically, in comparison with that of pure PAO, the mean friction coefficient and mean wear scar diameter of the 1.0 wt% CPs-OA/PAO suspension reduced by 47 and 30%, respectively. The friction-reducing and antiwear capabilities of CPs-OA strengthened with increasing load from 200 to 392 N and increasing test time from 240 to 480 min. In addition, the CPs-OA-based additives could work for a long time without weakening the lubrication capability. The synergistic effect of tribofilm, including PAO molecules and the CPs-OA layer, might account for the outstanding friction-reducing and antiwear capabilities of CPs-OA-based additives under boundary lubrication.
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Acknowledgements
This work was financially supported by the Opening Project of Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province (YQKF201402), the Postdoctoral Science Foundation funded project of China (2015M582567), and National Natural Science Foundation of China (Nos. 51302273, 21403173).
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Lu, H., Tang, W., Liu, X. et al. Oleylamine-modified carbon nanoparticles as a kind of efficient lubricating additive of polyalphaolefin. J Mater Sci 52, 4483–4492 (2017). https://doi.org/10.1007/s10853-016-0694-x
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DOI: https://doi.org/10.1007/s10853-016-0694-x