Lithium and complex lithium greases were modified by few-layer graphene nanoflakes. Tribological tests demonstrate improvement of the lubricating characteristics, e.g. increase of the welding load and decrease of the wear scar diameter after the modification. XPS method showed occurrence tribochemical reaction between lithium 12-hydroxystearate molecules and graphene nanoflakes surface during exploitation of the grease. It was shown that graphene nanoflakes are corrosion-inactive in lubricating compositions and compatible with modern additive packages.

Keywords:

References

1. J. C. Spear, B. W. Ewers and J. D. Batteas, Nano Today 10, 301 (2015). Crossref, Web of Science, Google Scholar
2. S. Shahnazar, S. Bagheri and S. B. A. Hamid, Int. J. Hydrog. Energy 41, 3153 (2016). Crossref, Web of Science, Google Scholar
3. W. Zhai, N. Srikanth, L. B. Kong and K. Zhou, Carbon 119, 150 (2017). Crossref, Web of Science, Google Scholar
4. I. Ali et al., J. Mol. Liq. 279, 251 (2019). Crossref, Web of Science, Google Scholar
5. S. A. Chernyak et al., Appl. Surf. Sci. 439, 371 (2018). Crossref, Web of Science, Google Scholar
6. P. Nagare, H. Kudal and A. Taguchi, Procedia Manuf. 20, 487 (2018). Crossref, Google Scholar
7. W. J. Bartz, Wear 17(5–6), 421 (1971). Crossref, Web of Science, Google Scholar
8. N. V. Usol’tseva and A. I. Smirnova, Lubricants 7(12), 111 (2019). Crossref, Web of Science, Google Scholar