Abstract
Nanolubricant additives have attracted wide attention because of their promising prospects in energy saving, emission reduction, and improvement of equipment reliability. In this study, the core–shell nanocomposites of a-C:F coating nano-magnesium silicate hydroxide (MSH@C:F) were prepared in subcritical water. Polytetrafluoroethylene (PTFE) was used as a carbon fluorine source to prepare shell of fluorine-doped amorphous carbon (a-C:F). SEM, TEM, XRD, and XPS were applied to characterize the nature of the composite powder MSH@C:F. The results of tribological tests show that MSH@C:F with appropriate F/C ratio has excellent tribological properties as lubricant additive, and the a-C:F shell plays a key role. Ab-initio molecular dynamics (AIMD) computation results show that OH− in sodium hydroxide (NaOH) plays a major role in the defluorination of PTFE and the formation of carbonyl group (C=O). Meanwhile, classical molecular dynamics (CMD) simulation shows that MSH indirectly promotes defluorination of PTFE by producing Mg2+ and OH− from the erosion of the surface of MSH in water.
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Acknowledgements
This work was funded by Equipment Development Department of the Central Military Commission Foundation, China (Grant Nos. JZX7Y20190262063601, JZX7Y20190263069101), Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Foundation, China (Grant No. BZ0388201801), and the Fundamental Research Funds for the Central Universities (Grant No. 2019YJS152).
Funding
This work was funded by Equipment Development Department of the Central Military Commission Foundation, China (Grant Nos. JZX7Y20190262063601, JZX7Y20190263069101), Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Foundation, China (Grant No. BZ0388201801), and the Fundamental Research Funds for the Central Universities (Grant No. 2019YJS152).
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Zhang, H., Chang, Q. Fluorine-Doped Amorphous Carbon-Coated Magnesium Silicate Hydroxide as Lubricant Additive and Atomic Simulation. Tribol Lett 69, 11 (2021). https://doi.org/10.1007/s11249-020-01386-7
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DOI: https://doi.org/10.1007/s11249-020-01386-7