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Fretting wear of TiN PVD coating under variable relative humidity conditions – development of a “composite” wear law

Rybiak, R., Fouvry, S., Liskiewicz, T. and Wendler, B. (2008) Fretting wear of TiN PVD coating under variable relative humidity conditions – development of a “composite” wear law. Surface and Coatings Technology, 202 (9). pp. 1753-1763. ISSN 0257-8972

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Fretting is defined as a small oscillatory displacement between two contacting bodies. The interface is damaged by debris generation and its ejection from the contact area. The application of hard coatings is an established solution to protect against fretting wear. For this study the TiN hard coating manufactured by a PVD method has been selected, and tested against a polycrystalline alumina smooth ball. A fretting test programme has been carried out at a frequency of 5 Hz, 100 N normal load, 100 μm displacement amplitude and at five values of relative humidity: 10, 30, 50, 70 and 90% at a temperature of 296 K. The intensity of the wear process is shown to be significantly dependent on the environmental conditions. A dissipated energy approach has been employed in this study to quantify wear rates of the hard coating. The approach predicts wear kinetics under constant medium relative humidity in a stable manner. It has been shown that an increase of relative humidity promotes the formation of hydrate structures at the interface and modifies the third body rheology. This phenomenon has been characterised by the evolution of wear kinetics associated with a significant variation of the corresponding energy wear coefficient. Hence, a ‘composite’ wear law, integrating the energy wear coefficient as a function of relative humidity, is introduced. It permits a prediction of wear under variable relative humidity conditions from 10 to 90% within a single fretting test. The stability of this approach is demonstrated by comparing various variable relative humidity sequences.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2007 Elsevier B.V. This is an author produced version of a paper published in Surface and Coatings Technology. 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: 26 Nov 2008 19:16
Last Modified: 08 Feb 2013 17:05
Published Version: http://dx.doi.org/10.1016/j.surfcoat.2007.07.103
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.surfcoat.2007.07.103
URI: http://eprints.whiterose.ac.uk/id/eprint/4934

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