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Impact of Impurity Content on the Sintering Resistance and Phase Stability of Dysprosia- and Yttria-Stabilized Zirconia Thermal Barrier Coatings

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Abstract

Dysprosia-stabilized zirconia (DySZ) is a promising candidate to replace yttria-stabilized zirconia (YSZ) as a thermal barrier coating due to its lower inherent thermal conductivity. It is also suggested in studies that DySZ may show greater stability to high temperature phase changes compared to YSZ, possibly allowing for coatings with extended lifetimes. Separately, the impurity content of YSZ powders has been proven to influence high-temperature sintering behavior. By lowering the impurity oxides within the spray powder, a coating more resistant to sintering can be produced. This study presents both high purity and standard purity dysprosia and YSZ coatings and their performance after a long heat treatment. Coatings were produced using powder with the same morphology and grain size; only the dopant and impurity content were varied. Samples have been heat treated for exposure times up to 400 h at a temperature of 1150 °C. Samples were measured for thermal conductivity to plot the evolution of coating thermal properties with respect to exposure time. Thermal conductivity has been compared to microstructure analysis and porosity measurement to track structural changes. Phase analysis utilizing x-ray diffraction was used to determine differences in phase degradation of the coatings after heat treatment.

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Acknowledgments

Thanks to Jönköping University for assistance with the thermal property evaluation. Thanks to Stefan Björklund for spraying of the experimental coatings. Thanks to Dr. Radek Musalek for helping to set up the collaboration work with IPP Prague.

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Authors and Affiliations

  1. University West, Trollhättan, Sweden

    Nicholas Curry & Nicolaie Markocsan

  2. University of Manchester, Manchester, UK

    Wyszomir Janikowski

  3. Institute of Plasma Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

    Zdenek Pala & Monika Vilémová

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  1. Nicholas Curry
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  2. Wyszomir Janikowski
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  3. Zdenek Pala
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  4. Monika Vilémová
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  5. Nicolaie Markocsan
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Correspondence to Nicholas Curry.

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Curry, N., Janikowski, W., Pala, Z. et al. Impact of Impurity Content on the Sintering Resistance and Phase Stability of Dysprosia- and Yttria-Stabilized Zirconia Thermal Barrier Coatings. J Therm Spray Tech 23, 160–169 (2014). https://doi.org/10.1007/s11666-013-0014-9

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  • DOI: https://doi.org/10.1007/s11666-013-0014-9

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