Abstract
AbstractComponents running in fluid-free friction regimes are exposed to harsh conditions leading to increased friction and wear. Thereby, the use of the solid lubricant molybdenum disulfide (MoS2) via lacquers, powders or physical vapor deposition (PVD) coatings enables a friction and wear reduction. However, the tribological performance is limited to low mechanical loads. A promising coating concept already proven for high mechanical loads is the incorporation of the triboactive elements Mo and S in wear resistant hard nitride (Cr,Al)N matrix. In this study the supply mechanism and transfer of the tribofilm build out of the toplayer of the triboactive coating graded (Cr,Al)N + Mo:S under high mechanical loads at humid air were analyzed. Here, the chemical composition of the tribofilm was determined by a combination of Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) and correlated with tribological analysis. The results prove a friction and wear reduction independent of Hertzian pressure in the area of 400 MPa ≤ pH ≤ 1300 MPa due to the formation of a MoS2 and molybdenum oxide MoxOy containing tribofilm, whereby the share of MoxOy dominates compared to MoS2. Based on the results the understanding of the effect of the MoS2 + MoxOy containing tribofilm on the tribological behavior is increased.
Funder
deutsche forschungsgemeinschaft
RWTH Aachen University
Publisher
Springer Science and Business Media LLC
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference43 articles.
1. Erdemir, A.: Solid Lubricants and Self-Lubricating Films. In: Bhushan, B. (ed.) Modern Tribology Handbook. Mechanics and Materials Science Series, pp. 787–826. CRC Press, Boca Raton, FL (2000)
2. Yilmaz, M., Kratzer, D., Lohner, T., Michaelis, K., Stahl, K.: A study on highly-loaded contacts under dry lubrication for gear applications. Tribol. Int. (2018). https://doi.org/10.1016/j.triboint.2018.07.016
3. Hofmann, S., Yilmaz, M., Maier, E., Lohner, T., Stahl, K.: Friction and contact temperature in dry rolling-sliding contacts with MoS2-bonded and a-C:H: Zr DLC coatings. Int. J. Mech. Mater. Eng. (2021). https://doi.org/10.1186/s40712-021-00129-3
4. Gradt, T., Schneider, T.: Tribological performance of MoS2 coatings in various environments. Lubricants (2016). https://doi.org/10.3390/lubricants4030032
5. Wahl, K.J., Singer, I.L.: Quantification of a lubricant transfer process that enhances the sliding life of a MoS2 coating. Tribol. Lett (1995). https://doi.org/10.1007/BF00157976
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