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Microstructure and Thermal Behavior of Thermal Barrier Coatings

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Abstract

Yttria stabilized zirconia thick coatings were thermally sprayed from two different feedstock powders. Coating characteristics such as density, crystalline phase composition, and microstructure were evaluated. The thermal expansion coefficient and thermal diffusivity were measured as a function of temperature up to 800 °C and analyzed in terms of the microstructural features. The ability of available models to relate the measured thermal properties to the microstructural features as characterized by readily available methods was assessed. The importance of pore shape and orientation on the thermal conductivity was evidenced. The thermal contact resistance between the substrate and the coating in these samples was estimated from the thermal diffusivity data, and found to change during cooling from 800 °C.

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Acknowledgments

The authors would like to acknowledge the Auto 21 National Centre of Networks of Excellence and Materials and Manufacturing, Ontario, for financial support, and the Industrial Materials Institute of the National Research Council, Canada, for technical support. Financial support from the MEC-MAT2006-07118 is gratefully acknowledged. E. Garcia acknowledges financial support from the I3P-PC2005L program.

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Authors and Affiliations

  1. Institute for Ceramics and Glass (C.S.I.C.), C/Kelsen 5, Campus de Cantoblanco, 28049, Madrid, Spain

    E. Garcia & P. Miranzo

  2. Centre for Advanced Coating Technologies, University of Toronto, Toronto, ON, Canada, M5S 3E4

    R. Soltani & T. W. Coyle

Authors
  1. E. Garcia
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  2. P. Miranzo
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  3. R. Soltani
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  4. T. W. Coyle
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Correspondence to E. Garcia.

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Garcia, E., Miranzo, P., Soltani, R. et al. Microstructure and Thermal Behavior of Thermal Barrier Coatings. J Therm Spray Tech 17, 478–485 (2008). https://doi.org/10.1007/s11666-008-9200-6

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  • DOI: https://doi.org/10.1007/s11666-008-9200-6

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