Seynstahl A, Polzer M, Bartz M, Wartzack S, Tremmel S (2023)
Publication Language: English
Publication Type: Journal article
Publication year: 2023
Book Volume: 11
Pages Range: 335
Issue: 8
URI: https://www.mdpi.com/2075-4442/11/8/335
DOI: 10.3390/lubricants11080335
Open Access Link: https://doi.org/10.3390/lubricants11080335
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.
APA:
Seynstahl, A., Polzer, M., Bartz, M., Wartzack, S., & Tremmel, S. (2023). Effects of Nitrogen Modification of Porous PVD–MoS2 Coatings on the Tribological Behavior under Rolling–Sliding Conditions in Vacuum. Lubricants, 11, 335. https://doi.org/10.3390/lubricants11080335
MLA:
Seynstahl, Armin, et al. "Effects of Nitrogen Modification of Porous PVD–MoS2 Coatings on the Tribological Behavior under Rolling–Sliding Conditions in Vacuum." Lubricants 11 (2023): 335.
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