Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures

ZHOU, Z., RAINFORTH, W. M., LUO, Q., HOVSEPIAN, Papken, OJEDA, J. J. and ROMERO-GONZALEZ, M. E. (2010). Wear and friction of TiAlN/VN coatings against Al2O3 in air at room and elevated temperatures. Acta Materialia, 58, 2912-2925.

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    Link to published version:: 10.1016/j.actamat.2010.01.020

    Abstract

    TiAlN/VN multilayer coatings exhibit excellent dry sliding wear resistance and low friction coefficient, reported to be associated with the formation of self-lubricating V2O5. To investigate this hypothesis, dry sliding ball-on-disc wear tests of TiAlN/VN coatings on flat stainless steel substrates were undertaken against Al2O3 at 25 C, 300 C and 635 C in air. The coating exhibited increased wear rate with temperature. The friction coefficient was 0.53 at 25 C, which increased to 1.03 at 300 C and decreased to 0.46 at 635 C. Detailed investigation of the worn surfaces was undertaken using site-specific transmission electron microscopy (TEM) via focused ion beam (FIB) microscopy, along with Fourier transform infrared (FTIR) and Raman spectroscopy. Microstructure and tribo-induced chemical reactions at these temperatures were correlated with the coating’s wear and friction behaviour. The friction behaviour at room temperature is attributed to the presence of a thin hydrated tribofilm and the presence of V2O5 at high temperature.

    Item Type: Article
    Research Institute, Centre or Group: Materials and Engineering Research Institute > Materials Analysis and Research Services
    Identification Number: 10.1016/j.actamat.2010.01.020
    Depositing User: Quanshun Luo
    Date Deposited: 25 Jul 2011 17:10
    Last Modified: 25 Jul 2011 17:10
    URI: http://shura.shu.ac.uk/id/eprint/3744

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