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Outstanding durability of sol-gel thermal barrier coatings reinforced by YSZ-fibers

Delon, Elodie and Ansart, Florence and Duluard, Sandrine Nathalie and Bonino, Jean-Pierre and Monceau, Daniel and Vande Put, Aurélie and Mainguy, Ronan and Thouron, Carole and Malié, André and Joulia, Aurélien and Bianchi, Luc and Gomez, Philippe Outstanding durability of sol-gel thermal barrier coatings reinforced by YSZ-fibers. (2018) Journal of the European Ceramic Society, 38 (14). 4719-4731. ISSN 0955-2219

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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2018.06.025


Thermal barrier coatings (TBC) were fabricated with commercial powders of yttria stabilized zirconia with spherical and fiber-like morphologies. The influence of fiber percentage and sintering temperature on the thermomechanical behavior was studied. TBCs with 60%–80% fibers content had the best lifetime in cyclic oxidation with less than 10% of coating spallation after 1000 cycles, with very good reproducibility. They reached lifetimes higher than industrial TBCs made by EB-PVD. The enhancement of durability is believed to be due to an increase in the thermomechanical constraints accommodation thanks to higher porosity and higher tenacity due to the presence of well anchored fibers, indeed deviation of the cracks were observed. Moreover, the morphology of the thermally grown oxide (TGO) layer is also favorable as it includes anchorage points of the TGO with fibers. This increased the adherence at the substrate interface and improved lifetime.

Item Type:Article
HAL Id:hal-02114969
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Direction Générale pour l'Armement - DGA (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
French Defense Research Organization (DGA) - SAFRAN Group
Deposited On:30 Apr 2019 07:02

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