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13.
Tribofilms of MoS[sub]2 nanotubes on steel and DLC-coated surfaces [Elektronski vir]
Kogovšek, Janez, 1984- ...
MoS2 and WS2 solid-lubricant nanoparticles as additives in oil provide good tribological properties based on the physical lubrication mechanisms in the contact. Therefore, they are strong candidates ...for use in the lubrication of DLC coatings, which only poorly interact with the traditional, chemically based additives. But until recently, attempts of lubrication of the DLC coatings with oils containing nanoparticles have been very scarce and thus the understanding of the interactions of the nanoparticles with the diamond-like carbon (DLC) coatings remained limited. We showed that the use of MoS2 nanotubes in oil can provide very effective lubrication for the steel and also for the DLC coatings, in spite of their lower chemical reactivity. Furthermore, formation of a tribofilm from the solid nanoparticles is decisive for their beneficial performance with both types of surfaces. We studied how a tribofilm formed from the MoS2 nanotubes is related to the tribological properties of these nanotubes and we analysed such a tribofilm on steel and DLC-coated surfaces using SEM, EDS, XPS and AES to observe any differences in the structure and interactions of the tribofilm with steel and DLC coating. The major difference between the steel and the DLC contacts is that the MoS2- based tribofilm surface coverage is greater in the case of the steel/steel contacts compared to the DLC/DLC contacts. Nevertheless, no direct evidence of any chemical reactions between the MoS2 and the steel or DLC coating was observed and we found that the chemical and functional properties of the MoS2-based tribofilm are very similar, or even the same, for both the steel and DLC-coated surfaces.
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