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Effect of Suspension Plasma-Sprayed YSZ Columnar Microstructure and Bond Coat Surface Preparation on Thermal Barrier Coating Properties

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Abstract

Suspension plasma spraying (SPS) is identified as promising for the enhancement of thermal barrier coating (TBC) systems used in gas turbines. Particularly, the emerging columnar microstructure enabled by the SPS process is likely to bring about an interesting TBC lifetime. At the same time, the SPS process opens the way to a decrease in thermal conductivity, one of the main issues for the next generation of gas turbines, compared to the state-of-the-art deposition technique, so-called electron beam physical vapor deposition (EB-PVD). In this paper, yttria-stabilized zirconia (YSZ) coatings presenting columnar structures, performed using both SPS and EB-PVD processes, were studied. Depending on the columnar microstructure readily adaptable in the SPS process, low thermal conductivities can be obtained. At 1100 °C, a decrease from 1.3 W m−1 K−1 for EB-PVD YSZ coatings to about 0.7 W m−1 K−1 for SPS coatings was shown. The higher content of porosity in the case of SPS coatings increases the thermal resistance through the thickness and decreases thermal conductivity. The lifetime of SPS YSZ coatings was studied by isothermal cyclic tests, showing equivalent or even higher performances compared to EB-PVD ones. Tests were performed using classical bond coats used for EB-PVD TBC coatings. Thermal cyclic fatigue performance of the best SPS coating reached 1000 cycles to failure on AM1 substrates with a β-(Ni,Pt)Al bond coat. Tests were also performed on AM1 substrates with a Pt-diffused γ-Ni/γ′-Ni3Al bond coat for which more than 2000 cycles to failure were observed for columnar SPS YSZ coatings. The high thermal compliance offered by both the columnar structure and the porosity allowed the reaching of a high lifetime, promising for a TBC application.

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Authors and Affiliations

  1. Safran Tech, Plateforme Aubes de Turbines Avancées, 171 Boulevard de Valmy, 92700, Colombes, France

    Benjamin Bernard

  2. CEA-DAM, Le Ripault, BP 16, 37260, Monts, France

    Aurélie Quet

  3. Safran Tech, Pôle Matériaux et Procédés, Rue de Jeunes Bois, Châteaufort, CS 80112, 78772, Magny-les-Hameaux, France

    Luc Bianchi & Aurélien Joulia

  4. LEMTA Université de Lorraine, 2 Avenue de la forêt de Haye, BP 160, 54504, Vandoeuvre-lès-Nancy, France

    Vincent Schick & Benjamin Rémy

  5. Safran Aircraft Engines, Rue Maryse Bastié, BP 129, 86101, Châtellerault, France

    André Malié

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  1. Benjamin Bernard
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  2. Aurélie Quet
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  3. Luc Bianchi
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Correspondence to Luc Bianchi.

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Bernard, B., Quet, A., Bianchi, L. et al. Effect of Suspension Plasma-Sprayed YSZ Columnar Microstructure and Bond Coat Surface Preparation on Thermal Barrier Coating Properties. J Therm Spray Tech 26, 1025–1037 (2017). https://doi.org/10.1007/s11666-017-0584-z

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  • DOI: https://doi.org/10.1007/s11666-017-0584-z

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