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Effect of Pt and Al content on the long-term, high temperature oxidation behavior and interdiffusion of a Pt-modified aluminide coating deposited on Ni-base superalloys

Vialas, Nadia and Monceau, Daniel Effect of Pt and Al content on the long-term, high temperature oxidation behavior and interdiffusion of a Pt-modified aluminide coating deposited on Ni-base superalloys. (2006) Surface and Coatings Technology, vol. 201 (n° 7). pp. 3846-3851. ISSN 0257-8972

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2006.07.246

Abstract

The present work is devoted to the effect of Al and Pt content on the oxidation behavior and interdiffusion of the industrial NiPtAl coating RT22 deposited on SCB and IN792 Ni-base superalloys. Some specimens of RT22/SCB experienced a defective aluminization resulting in one side with a lower Al content, and some specimens of RT22/IN792 had less platinum than the specification. The effect of both Pt and Al on the initial microstructure of the coating is discussed. Isothermal oxidation tests for 100 h and long-term cyclic oxidation/interdiffusion tests at 1050 °C were performed (up to 51 cycles of 300 h). It is shown that a 50 μm coating with 30 at.% Al instead of a nominal 70 μm coating with 52 at.% Al leads to the full transformation of the β phase after 6×300 h at 1050 °C and to the formation of large voids and spinel oxides after 35×300 h, but also to less surface undulations than the standard coating. A lower Pt concentration in the RT22 coating results in lower aluminization kinetics and increased spalling and Al consumption during long-term cyclic oxidation without decreasing the isothermal oxidation kinetics.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Surface and Coatings Technology website : http://www.sciencedirect.com/science/journal/02578972
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
Deposited On:20 May 2009 13:26

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