Characterisation of the microstructure and thermal properties of Nd2Zr2O7 and Nd2Zr2O7/YSZ thermal barrier coatings

The microstructure of following thermal barrier coatings (TBC) was characterised in this paper: monolayer coatings Nd2Zr2O7 and 8YSZ; a double ceramic layered (DCL) coating. Coatings were characterised by thicknesses that did not exceed 300μm and porosities of approx. 5%. The chemical and phase comp...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-07, Vol.32 (9), p.2035-2042
Main Authors: Moskal, G., Swadźba, L., Hetmańczyk, M., Witala, B., Mendala, B., Mendala, J., Sosnowy, P.
Format: Article
Language:English
Subjects:
Engine components
Functional applications
Thermal conductivity
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Summary:The microstructure of following thermal barrier coatings (TBC) was characterised in this paper: monolayer coatings Nd2Zr2O7 and 8YSZ; a double ceramic layered (DCL) coating. Coatings were characterised by thicknesses that did not exceed 300μm and porosities of approx. 5%. The chemical and phase composition analysis of the DCL layers revealed an external Nd2Zr2O7 ceramic layer approx. 80μm thick, a transitional zone approx. 120μm thick and an internal 8YSZ layer 100μm thick. For the case of the monolayer coating, the Nd2Zr2O7 pyrochlore phase was the only one-phase component. The surface topography of both TBC systems was typical for plasma sprayed coatings, and compressive stress state had a value of approx. 5–10MPa. Measurements of the thermal parameters, i.e., thermal diffusivity, point to considerably better insulative properties for both new types of layers when compared to the standard 8YSZ layers.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2011.12.004