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Preparation and High-temperature Properties of Nanostructured CeO2/ZrO2-Y2O3 Thermal Barrier Coating

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Author(s): GONG Wen-Biao, LI Yu-Peng, LIU Wei, SUN Da-Qian, WANG Wen-Quan

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 8;
Start page: 860;
Date: 2010;
Original page

Keywords: thermal barrier coatings; plasma spray; nanostructured; thermal shocks resistance; isothermal oxidation

ABSTRACT
The nanosized ZrO2-8wt%Y2O3 (YSZ) and CeO2/ZrO2-8wt%Y2O3(CYZ) particles were agglomerated as powder feedstocks. Thermal barrier coatings were prepared on the GH30 high temperature alloy surface by atmospheric plasma spray. The microstructures of the agglomerated powders doped with 25wt% CeO2 particles and the coating were characterized using scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD) technology. The thermal shocks resistance of the ZrO2-8wt%Y2O3 (YSZ) and CeO2/ZrO2-8wt%Y2O3 (CYZ) coatings were tested at 900¡䪱100¡䟡nd 1300¡䬠The oxidation resistance testing of coatings were tested at 1050¡䟦or 100h. The results show that the nano-powder by agglomerated treatment is porous spherical. The phase compositons of the nano-CYZ coating are relatively stable t phase (t-ZrO2, t-Zr0.82Y0.18O1.91, t-Zr0.82Ce0.18O2) and c phase (c-CeO2). The average grain size of the CYZ coating is about 45nm. The nanostructured CeO2/ZrO2-Y2O3 coating exhibit higher thermal-shock and oxidation resistances than those of the nano-YSZ coating.

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