Influence of Annealing on the Grain Growth and Thermal Diffusivity of Nanostructured YSZ Thermal Barrier Coating
Na WANG，Chungen ZHO Ut，Shengkai GONG and Huibin XU
Department of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China
The nanostructured zirconia coatings were deposited by atmospherically plasma spraying．Scanning electron microscopy(SEM)．transmission electron microscopy(TEM)and X—ray diffraction were used to investigate themicrostructure of the zirconia coatings．ThermaI diffusivity values at normal temperatures have been evaluated by Iaser flash technique．Effect of annealing on the microstructure evolution of the zirconia coating has been performed．The grains and thermaI diffusivity are increased with increasing annealing time and temperature．The grain growth is according to the GRIGC(the grain rotation induced grain lescence)mechanism．The increase in thermaI diffusivity is attributed to the grain growth and the decrease in porosity of nanostructured zirconia coatings．
KEY WORDS：Grain size；Thermal diffusivity；Thermal barrier coating；Plasma spraying
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