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Effects of Nitrogen Modification of Porous PVD–MoS₂ Coatings on the Tribological Behavior under Rolling–Sliding Conditions in Vacuum

Title data

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. Vol. 11 (2023) Issue 8 . - 335.
ISSN 2075-4442
DOI: https://doi.org/10.3390/lubricants11080335

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: MoS2; tribology; vacuum; solid lubrication; transfer layer; two-disc
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing Stephan Tremmel
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 29 Aug 2023 05:59
Last Modified: 29 Aug 2023 05:59
URI: https://eref.uni-bayreuth.de/id/eprint/86692