Investigation of the Hardness Development of Molybdenum Coatings under Thermal and Tribological Loading

verfasst von

Bernd-Arno Behrens, Eugen Stockburger, Hendrik Wester, Gerhard Poll, Florian Pape, Dennis Konopka, Norman Heimes

Abstract

The increasing global demand for innovative and environmentally friendly lubricants can be met through the use of solid lubricants. By switching from conventional lubricants such as various oils or grease to solid lubricants, new scopes of application can also be opened up. The main requirements for solid lubricants are a reduction in the coefficient of friction (CoF) and an increase in wear resistance. Due to the favourable material properties, molybdenum (Mo) coatings fulfil the tribological requirements and are therefore promising solid lubricants which can be applied via physical vapour deposition (PVD). In this work, the impact of substrate temperature on the hot hardness of deposited Mo coatings was determined. The specimen with the highest hot hardness was then tribologically examined both at the micro and nano level. Through an analysis of the wear tracks by means of nanoindentation and scanning electron microscopy (SEM), it was possible to detect the influence of the tribological load separately from that of the thermal loads. The results showed that the tribological load influenced the Mo coating by significantly increasing its hardness. This was achieved due to the work hardening of the Mo layer leading to an increase in the wear resistance of the coating.

Organisationseinheit(en)

Institut für Umformtechnik und Umformmaschinen
Institut für Maschinenkonstruktion und Tribologie

Typ

Artikel

Journal

Lubricants

Band

11

Anzahl der Seiten

14

ISSN

2075-4442

Publikationsdatum

30.06.2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Maschinenbau, Oberflächen, Beschichtungen und Folien

Elektronische Version(en)

https://doi.org/10.3390/lubricants11070283 (Zugang: Offen)