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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Particle growth mechanism of nanocrystalline zirconia powder during high temperature heat treatment
LIU Chun-bo(刘纯波), YU Lian-sheng(于连生), JIANG Xian-liang(蒋显亮)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:Agglomerated nanocrystalline ZrO2-8%Y2O3 powder prepared by spray drying was heat-treated in air at temperatures from 1 200 ℃ to 1 400 ℃ for 2 h. Scanning electron microscopy was used to examine the changes of particle size and morphology, and X-ray diffraction was used to analyze the change of constituent phases before and after the high temperature heat treatment. Nano-particle growth behavior was also investigated. The results show that the major constituent phase of the agglomerated nanocrystalline powder is tetragonal, and non-uniform growth of the nano-particles occurs while the heat treatment temperature reaches 1 300 ℃. This non-uniform growth phenomenon is related with the inhomogeneous distribution of Y2O3 in ZrO2. Nano-particles grow into micron particles through the mechanisms of gradual merging of nano-particles in some areas and sudden merging of nano-particles in other areas.

 

Key words: nanocrystalline zirconia; thermal barrier coating; spray drying; agglomeration; nano-particle growth

ISSN 1672-7029
CN 43-1423/U

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