Publication :


Title:

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

Abstract:
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 :
@article{Pin2014,
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},
Volume={},
Number={34},
Pages={961-974},
Year={2014}}


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