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Optimized sol–gel thermal barrier coatings for long-term cyclic oxidation life

Pin, Lisa and Vidal, Vanessa and Blas, Fabien and Ansart, Florence and Duluard, Sandrine Nathalie and Bonino, Jean-Pierre and Le Maoult, Yannick and Lours, Philippe Optimized sol–gel thermal barrier coatings for long-term cyclic oxidation life. (2014) Journal of the European Ceramic Society, 34 (4). 961-974. ISSN 0955-2219

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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2013.10.013

Abstract

New promising thermal barrier coatings (TBCs) processed by the sol–gel route are deposited onto NiPtAl bond coated superalloy substrates usingthe dip and/or spray coating technique. In this study, the optimization of the process, including an appropriate heat treatment prone to densifythe yttria-stabilized-zirconia (YSZ) top-coat and leading to the sintering and the development of a resulting crack network, is investigated. Inparticular, relevant information on internal strain evolution during the heat treatment are obtained using in situ synchrotron X-rays diffraction andconfirm a stabilization of the TBC through the occurrence of the micro-cracks that beneficially releases the in-plane sintering stress. Such TBCs aresubsequently reinforced using additional material brought within the cracks using sol–gel spray coating. The effect of various process parameters,such as the pre-oxidation of the bond-coat, on the sol gel TBCs consolidation and their cyclic oxidation resistance enhancement, is presented.Reinforced sol–gel TBCs are successfully oxidized up to more than one thousand 1 h-cycles at 1100◦C, without any detrimental spallation.

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 Journal of the European Ceramic Society website : http://www.sciencedirect.com/science/article/pii/S0955221913004731
HAL Id:hal-01179395
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:22 Jul 2015 12:09

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