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Formation mechanisms of low-friction tribo-layers on arc-evaporated TiC1−xNx hard coatings |
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| Authors: | M Rebelo de Figueiredo J Neidhardt R Kaindl A Reiter R Tessadri C Mitterer |
| Affiliation: | aChristian Doppler Laboratory for Advanced Hard Coatings, Department of Physical Metallurgy and Materials Testing, University of Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria bInstitute of Mineralogy and Petrography, University of Innsbruck, 6020 Innsbruck, Austria cOerlikon Balzers AG, 9496 Balzers, Municipality of Liechtenstein, Austria |
| Abstract: | A detailed correlation of the tribological performance of arc-evaporated TiC1−xNx coatings with testing temperature, atmosphere as well as variation in load and sliding velocity is presented in this paper. The low-friction behavior in combination with its mechanical integrity are the reasons for the extensive industrial application of TiC1−xNx over the last decades. Still the tribo-mechanisms behind this performance are not yet completely understood. The present study adds further understanding, as the low-friction behavior degrades at elevated temperatures and dry or inert environments, which is related to the different constitution of the tribo-layer formed as investigated by Raman spectroscopy. Surprisingly, the wear rate of the coatings does not correlate with the coefficient of friction indicating the presence of different wear regimes. |
| Keywords: | TiCN coatings Low-friction mechanisms Raman micro-spectroscopy Ball-on-disc sliding Ambient-dependent wear mechanisms |
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