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Seynstahl, Armin ; Polzer, Markus ; Bartz, Marcel ; Wartzack, Sandro ; Tremmel, Stephan:
Effects of Nitrogen Modification of Porous PVD–MoS₂ Coatings on the Tribological Behavior under Rolling–Sliding Conditions in Vacuum.
In: Lubricants.
Bd. 11
(2023)
Heft 8
.
- 335.
ISSN 2075-4442
DOI: https://doi.org/10.3390/lubricants11080335
Abstract
In order to improve the tribological performance of PVD–MoS2 coatings, which are frequently used as a solid lubricant for operating in challenging environments, e.g., in a vacuum, they can be modified with nitrogen. This work evaluates the tribological behavior and a possible compaction occurring during the initial tribological load in the rolling contact for pure and nitrogen-modified PVD–MoS2 coatings in a vacuum. Short-running tests (1000 cycles) of coated steel discs paired with uncoated steel discs made from 100Cr6 (1.3505, AISI 52100) were conducted on a two-disc tribometer. The slide-to-roll ratio of 10.5% was kept constant, while the load was varied in two steps from 1.1 GPa to 1.6 GPa. Subsequently, a comparison was made between the worn and the pristine coatings by means of nanoindentation and an optical analysis of the wear track. The formation of a load-bearing solid lubrication was achieved for both MoS2-variants. The main differences affected the material transfer and wear mechanisms. The worn coatings reached a similar wear coefficient of 4 × 10−6 mm3N−1m−1 and a possible compaction of the coatings was found, indicated through an increased indentation hardness (for MoS2 1158% and MoS2:N 96% at a 1.1 GPa load). The assumed tribological mechanism changed with nitrogen modification, but scales with increasing load. The nitrogen-modified MoS2 coating showed less compaction than pure MoS2, while the frictional behavior was improved by a 17% reduction of the coefficient of friction.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | MoS2; tribology; vacuum; solid lubrication; transfer layer; two-disc |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Konstruktionslehre und CAD > Lehrstuhl Konstruktionslehre und CAD - Univ.-Prof. Dr.-Ing. Stephan Tremmel |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 29 Aug 2023 05:59 |
| Letzte Änderung: | 29 Aug 2023 05:59 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/86692 |