Characterization of microstructure and thermal properties of Gd2Zr2O7-type thermal barrier coating

We present herein a characterization of the microstructure and thermal properties of thermal barrier coatings (TBCs), which we obtained via plasma spraying of powder Gd2Zr2O7. By using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD), we evaluated the phase composition of a cerami...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-07, Vol.32 (9), p.2025-2034
Main Authors: Moskal, G., Swadźba, L., Hetmańczyk, M., Witala, B., Mendala, B., Mendala, J., Sosnowy, P.
Format: Article
Language:English
Subjects:
Microstructure characterization
TBC
Thermal conductivity
Zirconates
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Summary:We present herein a characterization of the microstructure and thermal properties of thermal barrier coatings (TBCs), which we obtained via plasma spraying of powder Gd2Zr2O7. By using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD), we evaluated the phase composition of a ceramic layer and estimated the ceramic-layer stress state by the sin2ψ method. The tests revealed that the TBC layer consisted of a single-phase structure of Gd2Zr2O7, namely, an Fd3m lattice. The thermal diffusivity of the outer ceramic layer was determined based on a bilayer model and corrected with a factor to account for the presence of pores. The results reveal that the use of the standard parameters in a standard spraying process gives good-quality Gd2Zr2O7 TBCs with a thermal conductivity considerably lower than 8YSZ-type TBCs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2011.11.043