The effect of (Ti + Al): V ratio on the structure and oxidation behaviour of TiAlN/VN nano-scale multilayer coatings

LEWIS, D. B., CREASEY, S. J., ZHOU, Z., FORSYTH, J. J., EHIASARIAN, A. P., HOVSEPIAN, P. E., LUO, Q., RAINFORTH, W. M. and MUNZ, W. D. (2004). The effect of (Ti + Al): V ratio on the structure and oxidation behaviour of TiAlN/VN nano-scale multilayer coatings. Surface and Coatings Technology, 177, 252-259.

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Link to published version:: 10.1016/j.surfcoat.2003.09.041

Abstract

Nano-scaled multilayered TiAlN/VN coatings have been grown on stainless steel and M2 high speed steel substrates at U-B = - 85 V in an industrial, four target, Hauzer HTC 1000 coater using combined cathodic steered arc etching/unbalanced magnetron sputtering. X-ray diffraction (XRD) has been used to investigate the effects of process parameters (Target Power) on texture evolution (using texture parameter T*), development of residual stress (sin(2) psi method) and nano-scale multilayer period. The composition of the coating was determined using energy dispersive X-ray analysis. The thermal behaviour of the coatings in air was studied using thermo-gravimetric analysis, XRD and scanning electron microscopy. The bi-layer period varied between 2.8 and 3.1 nm and in all cases a {1 1 0} texture developed with a maximum value T* = 4.9. The residual stress varied between -5.2 and -7.4 GPa. The onset of rapid oxidation occurred between 628 and 645 degreesC depending on the (Ti+Al):V ratio. After oxidation in air at 550 degreesC AlVO4, TiO2 and V2O5 Phases were identified by XRD with the AlVO4, TiO2 being the major phases. The formation of AlVO4 appears to disrupt the formation of Al2O3 which imparts oxidation resistance to TiAlN based coatings. Increasing the temperature to 600 and 640 degreesC led to a dramatic increase in the formation of V2O5 which was highly oriented (0 0 1) with a plate-like morphology. At 640 degreesC there was no evidence of the coating on XRD. Increasing the temperature to 670 degreesC led to further formation of AlVO4 and a dramatic reduction in V2O5. (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
Materials and Engineering Research Institute > Materials Analysis and Research Services
Identification Number: 10.1016/j.surfcoat.2003.09.041
Depositing User: Ann Betterton
Date Deposited: 18 Feb 2010 16:13
Last Modified: 10 Sep 2010 16:06
URI: http://shura.shu.ac.uk/id/eprint/1199

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