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Thermo – mechanical properties of SPS produced self-healing thermal barrier coatings containing pure and alloyed MoSi 2 particles

Kulczyk-Malecka, Justyna and Zhang, Xun and Carr, James and Nozahic, Franck and Estournès, Claude and Monceau, Daniel and Carabat, Alexandra Lucia and Sloof, Willem G. and van der Zwaag, Sybrand and Withers, Philip J. and Xiao, Ping Thermo – mechanical properties of SPS produced self-healing thermal barrier coatings containing pure and alloyed MoSi 2 particles. (2018) Journal of the European Ceramic Society, 38 (12). 4268-4275. ISSN 0955-2219

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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2018.04.053

Abstract

Yttria – partially stabilised zirconia (YPSZ) MoSi2 composites have been designed to prolong the lifetime of the matrix by self – healing cracks during thermal cycling. The healing reaction at high temperatures is based on the decomposition of MoSi2, leading to a volumetrically expanding reaction product, which seals the crack. In this work, coefficient of thermal expansion (CTE) and the fracture toughness of composites containing MoSi2 particles, produced by spark plasma sintering (SPS) have been compared to conventional YPSZ. The CTE mismatch between YPSZ and MoSi2 was found to be small, implying that thermally induced mismatch stresses will be small and the composites have a similar CTE to conventional YPSZ. Fracture toughness was found not to be affected by the particles and showed similar values to unreinforced YPSZ. Cracks introduced by indentation have been shown neither to prefer, or avoid, the particles suggesting that such a composite system is capable of autonomously activating the self – healing reaction.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found athttps://www.sciencedirect.com/science/article/pii/S0955221918302656?via%3Dihub#bibl0005
HAL Id:hal-01810342
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Manchester (UNITED KINGDOM)
Other partners > Delft University of Technology - TU Delft (NETHERLANDS)
Laboratory name:
Funders:
European Union Seventh Framework Programme
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Deposited By: cirimat webmestre
Deposited On:07 Jun 2018 08:17

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