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Thermal cycling behaviour of thermal barrier coating systems based on first- and fourth-generation Ni-based superalloys

Duhamel, Cécilie and Chieux, Marion and Molins, Régine and Rémy, Luc and Monceau, Daniel and Vande Put, Aurélie and Guédou, Jean-Yves Thermal cycling behaviour of thermal barrier coating systems based on first- and fourth-generation Ni-based superalloys. (2012) Materials at High Temperatures, 29 (2). 136-144. ISSN 0960-3409

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Official URL: http://dx.doi.org/10.3184/096034012X13335273125433

Abstract

This study deals with the cyclic oxidation behaviour of thermal barrier coating systems. The systems consist of an yttria-stabilised zircona ceramic top coat deposited by EB-PVD, a b-(Ni,Pt)Al bond coat and a Ni-based superalloy. Two different superalloys are studied: a first-generation one and a fourthgeneration one containing Re, Ru and Hf. The aim of this work is to characterise the microstructural evolution of those systems and to correlate it to their resistance to spallation. Thermal cycling is carried out at 1100°C in laboratory air, with the number of cycles ranging between 10 and 1000. Each cycle consists of a 1 h dwell followed by forced-air cooling for 15 min down to room temperature. Among the main results of this work, it is shown that the MCNG-based system is significantly more resistant to spallation than the AM1-based one. Up to 50 cycles, both systems exhibit similar oxidation rate and phase transformations but major differences are observed after long-term ageing. In particular, a Ru-rich b-phase is formed in the bond coat of the MCNG-based system while the AM1- based one undergoes strong rumpling of the TGOybond coat interface due to the loss of the thermal barrier coating.

Item Type:Article
Additional Information:Thanks to Maney Online editor. The definitive version is available at http://www.maneyonline.com The original PDF of the article can be found at Maney Online website : http://www.maneyonline.com/doi/abs/10.3184/096034012X13335273125433
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 > Mines ParisTech (FRANCE)
Other partners > Société nationale d'étude et de constructions de moteurs d'avion - SNECMA (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:10 Jul 2015 07:30

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