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Thermal Cycling and High-Temperature Corrosion Tests of Rare Earth Silicate Environmental Barrier Coatings

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Abstract

Lutetium and yttrium silicates, enriched with an additional secondary zirconia phase, environmental barrier coatings were synthesized by the solution precursor plasma spraying process on silicon carbide substrates. A custom-made oven was designed for thermal cycling and water vapor corrosion testing. The oven can test four specimens simultaneously and allows to evaluate environmental barrier performances under similar corrosion kinetics compared to turbine engines. Coatings structural evolution has been observed by SEM on the polished cross sections, and phase composition has been analyzed by XRD. All coatings have been thermally cycled between 1300 °C and the ambient temperature, without spallation, due to their porosity and the presence of additional secondary phase which increases the thermal cycling resistance. During water vapor exposure at 1200 °C, rare earth disilicates showed a good stability, which is contradictory with the literature, due to impurities—such as Si- and Al-hydroxides—in the water vapor jets. The presence of vertical cracks allowed the water vapor to reach the substrate and then to corrode it. It has been observed that thin vertical cracks induced some spallation after 24 h of corrosion.

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Acknowledgments

The authors would like to thank Kossi E. Béré for its technical support during the plasma spray process. They are also grateful to the Center of Characterization of Materials (Sherbrooke, QC, CA) and to NACOMAT partners (Bordeaux, France) for financial support.

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  1. Electrochemistry, Plasmas and Energy Research Center, University of Sherbrooke, Sherbrooke, QC, Canada

    Émilien Darthout & François Gitzhofer

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Darthout, É., Gitzhofer, F. Thermal Cycling and High-Temperature Corrosion Tests of Rare Earth Silicate Environmental Barrier Coatings. J Therm Spray Tech 26, 1823–1837 (2017). https://doi.org/10.1007/s11666-017-0635-5

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