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Al-Pt MOCVD coatings for the protection of Ti6242 alloy against oxidation at elevated temperature

Delmas, Mathieu and Poquillon, Dominique and Kihn, Yolande and Vahlas, Constantin Al-Pt MOCVD coatings for the protection of Ti6242 alloy against oxidation at elevated temperature. (2005) Surface and Coatings Technology, vol. 2 (n° 5-6). pp. 1413-1417. ISSN 0257-8972

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2005.08.028

Abstract

Results on isothermal oxidation at 873K for 90 h of Al-Pt coatings on Ti6242 coupons are reported. These coatings were obtained by low temperature, low pressure metalorganic chemical vapor deposition using Me3(MeCp)Pt(VI) and dimethylethylamine alane. Three coating architectures were investigated, namely pure Al, Pt and Al sequential sublayers, and co-deposited Al and Pt. Oxidation kinetics revealed a strong transient oxidation regime followed by a diffusion driven parabolic one. Such coatings allow to decrease oxidation kinetics more than one order of magnitude compared with those of the bare Ti6242. Scanning electron microscopy, second ion mass spectrometry, X-ray diffraction and transmission electron microscopy revealed that these coatings present a rough surface morphology. They are dense, they develop scales composed of γ-Al2O3 and δ-Al2O3 and they prevent titanium diffusion from the alloy to the surface. It is concluded that coatings produced by this process show promise for use as effective protection against oxidation of Ti6242 alloys and consequently they may raise the maximum operating temperature tolerated by corresponding parts in helicopter turboengines.

Item Type:Article
Additional Information:The original publication is available on http://www.sciencedirect.com/science/journal/02578972
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Thomas Bonnecarere

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