Publication :


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

Authors: L. Pin, V. Vidal, F. Blas, F. Ansart, S. Duluard, J.-P. Bonino, Y. Le Maoult and P. Lours
Year: 2014
Journal: Journal of the European Ceramic Society.
Number: 34, Pages: 961-974

DOI: 10.1016/j.jeurceramsoc.2013.10.013
Référencé ISI Web Of Science
Référencé Scopus

New promising thermal barrier coatings (TBCs) processed by the sol–gel route are deposited onto NiPtAl bond coated superalloy substrates using the dip and/or spray coating technique. In this study, the optimization of the process, including an appropriate heat treatment prone to densify the yttria-stabilized-zirconia (YSZ) top-coat and leading to the sintering and the development of a resulting crack network, is investigated. In particular, relevant information on internal strain evolution during the heat treatment are obtained using in situ synchrotron X-rays diffraction and confirm a stabilization of the TBC through the occurrence of the micro-cracks that beneficially releases the in-plane sintering stress. Such TBCs are subsequently 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.

Bibtex citation :
Author={Pin, L. and Vidal, V. and Blas, F. and Ansart, F. and Duluard, S. and Bonino, J.-P. and Le Maoult, Y. and Lours, P.},
Title={Optimized sol–gel thermal barrier coatings for long-term cyclic oxidation life},
Journal={Journal of the European Ceramic Society},

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