Oxidation behaviour of nanoscale TiAlN/VN multilayer coatings

ZHOU, Z., RAINFORTH, W. M., LEWIS, D. B., CREASY, S., FORSYTH, J. J., CLEGG, E., EHIASARIAN, A. P., HOVSEPIAN, P. E. and MUNZ, W. D. (2004). Oxidation behaviour of nanoscale TiAlN/VN multilayer coatings. Surface and Coatings Technology, 177, 198-203.

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Link to published version:: 10.1016/j.surfcoat.2003.09.031

Abstract

Nanoscale multilayer TiAlN/VN coatings were grown using combined cathodic arc/unbalanced magnetron deposition (arc bond sputtering, ABS) in an industrial-sized physical vapour deposition machine. The thermal behaviour of TiAlN/VN coatings in air was studied using thermo-gravimetric analysis, X-ray diffraction (XRD), scanning electron microscopy and transmission electron microscopy (TEM). Coatings were heat treated in air for 30 min at 550, 600, 638 and 672 degreesC. Surface oxidation occurred at greater than or equal to 550 degreesC at the coating surface. V2O5 was found to form at > 600 degreesC by XRD. V2O5, TiO2, AlVO4, were identified at 600 degreesC, with possible Al2TiO5, and VO2 phases. TEM revealed a non-uniform oxide/coating interface, with preferential oxidation along columnar grain boundaries, presumably because these provide a fast track for diffusion. At 672 degreesC, the entire coating volume was oxidised, and the coating spalled. (C) 2003 Elsevier B.V. All rights reserved.

Item Type: Article
Additional Information: 30th International Conference on Metallurgical Coatings and Thin Films APR 28-MAY 02, 2003 SAN DIEGO, CALIFORNIA
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Identification Number: 10.1016/j.surfcoat.2003.09.031
Depositing User: Ann Betterton
Date Deposited: 23 Feb 2010 17:28
Last Modified: 23 Feb 2010 17:28
URI: http://shura.shu.ac.uk/id/eprint/1205

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