Bec, S

Carpick, RW

Fontaine, J

Hilbert, J

Koshigan, KD

Le Mogne, T

Mangolini, F

Vacher, B

White Rose Research Online

This is a repository copy of Do silicon oxide doped DLC (SiOx-DLC) films get help from the environment during sliding?.White Rose Research Online URL for this paper:http://eprints.whiterose.ac.uk/91836/Version: Accepted VersionProceedings Paper:Koshigan, KD, Mangolini, F, Hilbert, J et al. (5 more authors) (2014) Do silicon oxide dopedDLC (SiOx-DLC) films get help from the environment during sliding? In: Abstracts of Papers of the American Chemical Society. 248th ACS National Meeting and Exposition, 10-14 Aug 2014, San Francisco, CA, USA. American Chemical Society . eprints@whiterose.ac.ukhttps://eprints.whiterose.ac.uk/Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version - refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher’s website. Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Do silicon oxide doped DLC (SiOx-DLC) films get a cure from the environment during sliding? !K.D. KOSHIGAN1, F. MANGOLINI2, J. HILBERT3, J.B. McCLIMON2, T. LE MOGNE1, R.W. CARPICK3, S. BEC1, J. FONTAINE1.  1. Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, Ecole Centrale de Lyon, Université de Lyon, 69134 Ecully France, Cedex. 2. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 3. Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA !Amorphous hydrogenated carbon (a-C:H) films are widely used as protective solid lubricant coatings in tribo-mechanical applications such as car engines, magnetic storage disks and biomedical implants. However, these films can exhibit low thermal stability and high residual stresses, and their frictional properties can strongly deteriorate due to changes in the gaseous sliding environment [1]. In the literature, silicon oxide doped diamond-like carbon (SiOx-DLC) films, also called diamond-like nanocomposite (DLN), exhibit better thermal stability [2] and are less sensitive to the environment [3] than a-C:H films. A convincing model to explain the mechanisms responsible for the improved stability does not yet exist. This work aims to identify the origin of the unique macroscopic tribological properties of DLN films under different environments (ambient air, UHV, oxygen gas and hydrogen gas). Friction experiments were performed with two linear reciprocating pin-on-flat tribometers, one operating in ambient air but allowing gas blowing around the contact, and one placed inside an ultra-high vacuum chamber allowing gas introduction up to 2 atmospheres and equipped with differential mass spectroscopy [4]. Ambient air tribometry tests using steel conterfaces provide evidence of the dependence of the interfacial shear strength on humidity, and tribotests carried out under UHV conditions indicated that the friction response is mainly controlled by the adhesive interactions between DLN film and the counterface. In this talk, we will address a key question: does the presence of reactive gases prevent the formation of adhesive junctions by surface passivation, or does it affect the way these junctions are released? A combination of morphological observations and surface analyses are used to help us answer this question.   References : [1] J. Robertson « Diamond-like amorphous carbon » Material science and engeneering 37, 129-281(2002) [2] C. Jongwannasiri, X. Xianghui Li, S. Watanabe « Improvement of Thermal Stability and tribological performance of diamond-like carbon composite thin films », Materials Sciences and Applications, 4, 630-636 (2013) [3] T. W. Scharf, J. A. Ohlhausen, D. R. Tallant, S. V. Prasad « Mechanisms of friction in diamondlike nanocomposite coatings » Journal of Applied Physics 101, 063521 (2013) [4] J. Tannous, M-I. De Barros Bouchet, Th. Le Mogne, P. Charles, J.M Martin : « Contribution of gas phase lubrication in understanding tribochemistry of organosulphur compounds » Tribology 1(2), 98–104 (2007)  !

Do silicon oxide doped DLC (SiOx-DLC) films get help from the environment during sliding?

https://eprints.whiterose.ac.uk/91836/1/Abstract-Tribology%20symposium-KD_Koshigan.pdf

Do silicon oxide doped DLC (SiOx-DLC) films get help from the environment during sliding?

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