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Microstructure of Metallorganic Chemical Vapor Deposited Aluminum Coatings on Ti6242 Titanium Alloy

Delmas, Mathieu and Vahlas, Constantin Microstructure of Metallorganic Chemical Vapor Deposited Aluminum Coatings on Ti6242 Titanium Alloy. (2007) Journal of The Electrochemical Society (JES), vol. 154 (n° 10). D538-D542. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/1.2769265

Abstract

Al-based alloys are used in aeronautics as a protective layer against the excessive oxidation of turbines blades. In this work, Al coatings were deposited by metallorganic chemical vapor deposition on Ti6242, a commercial titanium alloy, with Pt as a sublayer or codeposited to ensure this protection, eventually forming platinum aluminides. Continuous Al coatings were deposited on bare Ti6242, using both triisobutylaluminum and dimethylethylamine alane as precursors. The same operating conditions applied on a platinum sublayer lead to discontinuous layers mainly containing whiskers. The introduction of a surfactant, namely, ethyl iodide, in the input gas improves the coating morphology by providing nearly whisker-free continuous films, suitable for oxidation protection. Codeposition of Pt and Al results in reduced growth rate and yields layers with lower Pt content and with specific morphology. This behavior is attributed to the competition between Al and Pt compounds on the growing surface.

Item Type:Article
Additional Information:Thanks to Electrochemical Society editor. The definitive version is available at http://scitation.aip.org The original PDF of the article can be found at Journal of The Electrochemical Society website : http://www.ecsdl.org/JES/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
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: Celine Cabaup

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