TiAIN based nanoscale multilayer coatings designed to adapt their tribological properties at elevated temperatures

HOVSEPIAN, Papken, LEWIS, D. B., LUO, Q. and MUNZ, W. D. (2005). TiAIN based nanoscale multilayer coatings designed to adapt their tribological properties at elevated temperatures. Thin solid films, 1-2.

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    Link to published version:: 10.1016/j.tsf.2005.03.048

    Abstract

    The addition of properly selected elements, coupled in nanoscale multilayer structures, can further enhance the properties of TiAlN coatings and bring new high performance. The incorporation of Y in the nanoscale pseudo-superlattice TiAlCrN/TiAlYN with typical period of 1.7 nm not only improves the oxidation resistance but also effectively reduces the coefficient of friction of the coating from 0.9 to 0.65 at temperatures in the range of 850–950 °C. The adaptation of the tribological properties occurs as a result of the preferential migration of the Y to the column boundaries. TiAlN/VN superlattice can achieve another self-adaptation process. During friction the coatings adapt themselves to the combined thermal and mechanical wear by the formation of highly lubricious vanadium-oxides due to high flash temperatures at the asperity contacts on the surface. The integrity of the bulk of the coating is retained, leading to exceptionally low, for superhard coatings, friction coefficient of 0.5 and a wear coefficient of 2 × 10−17 m3·N−1·m−1. The coatings have been deposited by the combined steered cathodic arc unbalanced magnetron sputtering method.

    Item Type: Article
    Additional Information: Copyright © Elsevier B.V.
    Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
    Materials and Engineering Research Institute > Materials Analysis and Research Services
    Identification Number: 10.1016/j.tsf.2005.03.048
    Depositing User: Ann Betterton
    Date Deposited: 29 Jul 2008
    Last Modified: 21 Dec 2010 11:31
    URI: http://shura.shu.ac.uk/id/eprint/585

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