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Thermal Conductivity, Phase Stability, and Oxidation Resistance of Y3Al5O12 (YAG)/Y2O3–ZrO2 (YSZ) Thermal-Barrier Coatings

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Abstract

This paper describes a new multilayer TBC that incorporates a 10 μm-thick oxygen barrier layer of yttrium–aluminum garnet (YAG) into a typical YSZ TBC system. The thermal conductivity of as-sprayed YAG/YSZ coatings was reduced due to excessive porosity and amorphous areas in the YAG layer. After long-term heat treatments, the conductivity of the multilayer was unaffected by the presence of YAG. Sintering and recrystallization of the amorphous YAG regions occurred during high-temperature heat treatments. While YAG itself possesses excellent phase stability, its presence also improved the phase stability of zirconia near the YAG/YSZ interface, inhibiting the outward diffusion of yttrium from high-yttria t-ZrO2 The YAG layer reduced the NiCoCrAlY bond-coat oxidation rate by a factor of three during isothermalfurnace tests conducted at 1200° C.

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Author notes

  1. Y. J. Su

    Present address: General Electric Co., Global Research Center, Schenectady, NY, USA

  2. R. W. Trice

    Present address: School of Materials Engineering, Purdue University, West Lafayette, IN, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA

    Y. J. Su & R. W. Trice

  2. General Electric Co., Global Research Center, Schenectady, NY, USA

    K. T. Faber

  3. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

    H. Wang & W. D. Porter

Authors
  1. Y. J. Su
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  2. R. W. Trice
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  3. K. T. Faber
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  4. H. Wang
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  5. W. D. Porter
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Su, Y.J., Trice, R.W., Faber, K.T. et al. Thermal Conductivity, Phase Stability, and Oxidation Resistance of Y3Al5O12 (YAG)/Y2O3–ZrO2 (YSZ) Thermal-Barrier Coatings. Oxidation of Metals 61, 253–271 (2004). https://doi.org/10.1023/B:OXID.0000025334.02788.d3

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  • DOI: https://doi.org/10.1023/B:OXID.0000025334.02788.d3

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