J Mater Sci Technol ›› 2006, Vol. 22 ›› Issue (06): 793-797.

• Research Articles • Previous Articles     Next Articles

Influence of Annealing on the Grain Growth and Thermal Diffusivity of Nanostructured YSZ Thermal Barrier Coating

Na WANG, Chungen ZHOU, Shengkai GONG, Huibin XU   

  1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2005-10-13 Revised:2006-02-27 Online:2006-11-28 Published:2009-10-10
  • Contact: Chungen ZHOU

Abstract: 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 the microstructure of the zirconia coatings. Thermal diffusivity values at normal temperatures have been evaluated by laser flash technique. Effect of annealing on the microstructure evolution of the zirconia coating has been performed. The grains and thermal diffusivity are increased with increasing annealing time and temperature. The grain growth is according to the GRIGC (the grain rotation induced grain coalescence) mechanism. The increase in thermal 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