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Oxidation Resistance of Thermal Barrier Coatings Based on Hollow Alumina Particles

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Abstract

Thermal barrier coatings were synthesized in a single step process from a slurry containing Al microspheres onto different Ni-based superalloys. Upon growth of the coating a top coat of hollow alumina spheres linked to an aluminium diffused coating through an alumina TGO formed. The isothermal and cyclic oxidation tests at different temperatures (900 till 1100 °C) up to 1000 h or 1500 cycles revealed progressive growth of different thermal oxides depending on the substrate composition. Faster degradation of the coatings occurred in the titanium-rich substrates (e.g. IN-738LC and PWA1483) compared to the titanium-poor ones (CM-247LC and René N5). By comparing with conventional low activity aluminide coatings, it appeared that the incorporation of alloying elements (notably Ti and Ta) to the diffused layers upon the high activity slurry coating process is responsible for such fastest degradation.

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Acknowledgments

The DECHEMA Forschung Institut (Germany) is gratefully acknowledged for the EPMA analyses. SR Technics Airfoil Services (Ireland) and Turbocoating (Italy) kindly provided, respectively, the low activity out-of-pack and the pack cemented coatings. This study was performed under the programme PARTICOAT FP7-NMP-2007-LARGE-1-CP-IP-211329-2 (2008–2012) funded by the European Union.

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  1. Pôle Sciences et Technology, LaSIE UMR7356 CNRS-Université de La Rochelle, 17042, La Rochelle, France

    F. Pedraza, M. Mollard, B. Rannou, B. Bouchaud, J. Balmain & G. Bonnet

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  1. F. Pedraza
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  2. M. Mollard
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  3. B. Rannou
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  4. B. Bouchaud
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  5. J. Balmain
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Correspondence to F. Pedraza.

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Pedraza, F., Mollard, M., Rannou, B. et al. Oxidation Resistance of Thermal Barrier Coatings Based on Hollow Alumina Particles. Oxid Met 85, 231–244 (2016). https://doi.org/10.1007/s11085-015-9570-3

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  • DOI: https://doi.org/10.1007/s11085-015-9570-3

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