Abstract
In this study, three different zeolitic imidazolate framework (ZIF) materials of ZIF-8, ZIF-71, and MAF-6 were synthesized, and their tribological properties as base grease were evaluated. We demonstrate that the tribological properties of ZIFs are correlated with the framework density/pore volume and the substituted groups. Under 200 N, MAF-6 has the lowest wear volume value and ZIF-71 exhibits the lowest friction coefficient. As the load increased, MAF-6 maintained the best and most stable tribological performances among the three ZIFs additives; however, the properties of ZIF-71 worsened. Thus, MAF-6 exhibits the lowest density and largest solvent-accessible volume (SAV) and has the lowest elastic stiffness; it easily slides and adheres onto the wear surface, forming a tribofilm that reduces friction and prevents severe wear. ZIF-71 with chlorinated groups may enhance the tribological performance; as the load rises, its dense and stiff structure has an adverse effect. These results are expected to be helpful for designing future ZIFs with excellent lubrication properties.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 21436008, 21503165, 21776198 and 21822808).
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Yuan, M., Zhao, Y., Niu, W. et al. Tribological Properties of Typical Zeolitic Imidazolate Frameworks as Grease-Based Lubricant Additives. J. of Materi Eng and Perform 28, 1668–1677 (2019). https://doi.org/10.1007/s11665-019-03911-9
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DOI: https://doi.org/10.1007/s11665-019-03911-9