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

doi:10.3724/SP.J.1077.2010.00860

Abstract

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℃,1100℃ and 1300℃. The oxidation resistance testing of coatings were tested at 1050℃ for 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-Zr_0.82Y_0.18O_1.91, t-Zr_0.82Ce_0.18O₂) and c phase (c-CeO₂). The average grain size of the CYZ coating is about 45nm. The nanostructured CeO₂/ZrO₂-Y₂O₃coating exhibit higher thermal-shock and oxidation resistances than those of the nano-YSZ coating.

Key words: thermal barrier coatings, plasma spray, nanostructured, thermal shocks resistance, isothermal oxidation

CLC Number:

TB383

GONG Wen-Biao, LI Yu-Peng, LIU Wei, SUN Da-Qian, WANG Wen-Quan. Preparation and High-temperature Properties of Nanostructured CeO₂/ZrO₂-Y₂O₃Thermal Barrier Coating[J]. Journal of Inorganic Materials, 2010, 25(8): 860-864.

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Preparation and High-temperature Properties of Nanostructured CeO₂/ZrO₂-Y₂O₃Thermal Barrier Coating

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