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Microstructural Characterization of a Zirconia-Titania-Yttria Thermal Barrier Coating

Published online by Cambridge University Press:  15 February 2011

P. Diaz ,
B. Ralph  and
M. J. Edirisinghe
P. Diaz
Affiliation:
Department of Materials Technology, Brunel University, Uxbridge, Middlesex, UB8 3PH, U.K.
B. Ralph
Affiliation:
Department of Materials Technology, Brunel University, Uxbridge, Middlesex, UB8 3PH, U.K.
M. J. Edirisinghe
Affiliation:
Department of Materials Technology, Brunel University, Uxbridge, Middlesex, UB8 3PH, U.K.
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Abstract

The phase transformations in a plasma sprayed zirconia-titania-yttria thermal barrier coating (TBC), subjected to different thermal treatments, in the temperature range 900–1400°C, were characterized by X-ray diffraction (XRD). Different transformation trends dependent on the cooling rate of the specimens from the treatment temperature, were observed. The study of the fracture surfaces of the as-sprayed and thermally treated ceramic coatings, using scanning electron microscopy (SEM), allows elucidation of the changes in the microstructure and the fracture mechanisms. The as-sprayed and thermally treated (1400°C) ceramic microstructures were also studied using transmission electron microscopy (TEM).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 403: Symposium I – Polycrystalline Thin Films: Structure, Texture, Properties and Applications II , 1995 , 253
Copyright
Copyright © Materials Research Society 1996

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