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Fretting wear of Ti(CxNy) PVD coatings under variable environmental conditions

Liskiewicz, T., Rybiak, R., Fouvry, S. and Wendler, B. (2006) Fretting wear of Ti(CxNy) PVD coatings under variable environmental conditions. Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 220 (3). pp. 125-134. ISSN 1350-6501

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Fretting wear as a specific type of degradation is defined as an oscillatory motion at small amplitude between two nominally stationary solid bodies in mutual contact. Under external stresses the interface is being damaged by debris generation and its successive ejections outside the contact area. A potential protection against fretting damage by means of hard coatings is being offered by different surface engineering techniques. For this study TiC, TiN and TiCN hard coatings manufactured by a PVD method have been selected and tested against smooth polycrystalline alumina ball. A fretting test programme has been carried out at the frequency of 5Hz, 100N normal load, 100µm displacement amplitude and at three values of a relative humidity: 10, 50 and 90% at 295-298K temperature. It turned out that the intensity of wear process was depending not only on loading conditions but on environmental ones as well. A significant impact of RH on wear rate and friction behaviour of the coatings under investigation has been observed. Two different damage mechanisms have been identified and related to the phenomena of debris oxidation and debris adhesion to the counterbody surface. In the latter case the debris deposited onto the surface of the alumina ball lead to a change of stress distribution at the interface and as a result to accelerated wear. In this work experiments with variable relative humidity increasing from 10% to 90% within 1 a single fretting test have been completed. It follows from these experiments that there exists an intermediate value of the RH at which the friction coefficient changes rapidly. Finally a dissipated energy approach has been applied in the work in order to quantify and compare fretting wear rates of different hard coatings.

Item Type: Article
Copyright, Publisher and Additional Information: © IMechE 2006. This is an author produced version of a paper published in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds)
Depositing User: Mrs Fiona Slade
Date Deposited: 28 Nov 2008 17:53
Last Modified: 08 Feb 2013 17:05
Published Version: http://dx.doi.org/10.1243/13506501JET139
Status: Published
Publisher: Professional Engineering Publishing
Refereed: Yes
Identification Number: 10.1243/13506501JET139
URI: http://eprints.whiterose.ac.uk/id/eprint/4938

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