Self-healing thermal barrier coating systems fabricated by spark plasma sintering

Journal article (2018)

Authors

Franck Nozahic Université de Toulouse
Claude Estournès Université de Toulouse
A.L. Carabat (OLD) MSE-1
W.G. Sloof (OLD) MSE-1
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
Daniel Monceau Université de Toulouse
Research Group
(OLD) MSE-1
Copyright: © 2018 Franck Nozahic, Claude Estournès, A.L. Carabat, W.G. Sloof, S. van der Zwaag, Daniel Monceau
DOI
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https://doi.org/10.1016/j.matdes.2018.02.001
Spark plasma sintering Intermetallic particles Self-healing thermal barrier coatings Ceramic matrix composites High-temperature cyclic oxidation Multi-layer materials
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Published Date

2018

Language

English

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Research Group

(OLD) MSE-1

Abstract

The present paper focuses on the Spark Plasma Sintering (SPS) manufacturing of a new type of self-healing thermal barrier coating (TBC) and a study of its thermal cycling behaviour. The ceramic coating consists on an Yttria Partially Stabilized Zirconia (YPSZ) matrix into which healing agents made of MoSi2-Al2O3 core-shell particles are dispersed prior to sintering. The protocol used to sinter self-healing TBCs on MCrAlY (M: Ni or NiCo) pre-coated Ni-based superalloys is described and the reaction between the particles and the MCrAlY bond coating as well as the preventive solutions are determined. Thermal cycling experiments are performed on this complete multilayer system to study the crack healing behaviour. Post-mortem observations highlighted local healing of cracks due to the formation of silica and the subsequent conversion to zircon at the rims of the cracks.