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Processing thermal barrier coatings via sol-gel route: crack network control and durability

Blas, Fabien and Ansart, Florence and Lours, Philippe and Bonino, Jean-Pierre and Duluard, Sandrine Nathalie and Vidal, Vanessa and Pin, Lisa and Pujol, Guillaume and Bonin, Luiza Processing thermal barrier coatings via sol-gel route: crack network control and durability. (2018) Surface and Coatings Technology, 334. 71-77. ISSN 0257-8972

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Official URL: https://doi.org/10.1016/j.surfcoat.2017.11.008

Abstract

Thermal barrier coatings (TBC) processed by sol–gel route are deposited onto NiPtAl bond coated superalloy substrates. A crack microstructure, if well controlled, is adequate to get satisfactory thermo-mechanical behaviour when the TBC is cyclically oxidized. This paper deals with the adjustment of the properties of the microcracked network which is inherent to the process by changing the formulation of the sol and by adding a reinforcement step. The objective is to reduce the size and depth of the surface cracks network. This network controls the release of thermo-mechanical stress in the layers and reduces detrimental propagation of cracks that could result in the spallation of the coatings during engine operation. Several physico-chemical characterizations were performed, associated to image analyses to (i) evaluate the cracks distribution (depth, length and width), in the case of two dispersants, and (ii) to estimate their influence on the performances of TBC systems. Characterizations by cyclic oxidation were carried out using a cyclic oxidation instrumented rig to monitor on a real time basis the crack propagation and spallation. Correlations between the cracked network parameters and the lifetime of the TBC are proposed in this paper.

Item Type:Article
HAL Id:hal-01637109
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)
Other partners > Institut Mines-Télécom (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
Ecole Doctorale Aéronautique Astronautique - (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:20 May 2019 08:04

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