| Particle growth mechanism of nanocrystalline zirconia powder during high temperature heat treatment |
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| 引用本文： | 刘沌波 于连生 蒋显亮. Particle growth mechanism of nanocrystalline zirconia powder during high temperature heat treatment[J]. 中国有色金属学会会刊, 2007, 17(5): 1022-1027. DOI: 10.1016/S1003-6326(07)60219-2 |
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| 作者姓名： | 刘沌波 于连生 蒋显亮 |
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| 作者单位： | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| 基金项目： | Project supported by the Priority Development Program of the Human Resources Ministry of China for 0versea Students |
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| 摘 要： | 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 ofnano-particles in other areas.
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| 关 键 词： | 氧化锆 喷舞干燥 烧结作用 离子生长 |
| 收稿时间： | 2006-10-31 |
| 修稿时间： | 2006-10-31 |
Particle growth mechanism of nanocrystalline zirconia powder during high temperature heat treatment |
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| LIU Chun-bo,YU Lian-sheng,JIANG Xian-liang. Particle growth mechanism of nanocrystalline zirconia powder during high temperature heat treatment[J]. Transactions of Nonferrous Metals Society of China, 2007, 17(5): 1022-1027. DOI: 10.1016/S1003-6326(07)60219-2 |
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| Authors: | LIU Chun-bo YU Lian-sheng JIANG Xian-liang |
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| Affiliation: | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Agglomerated nanocrystalline ZrO2-8%Y2O3 powder prepared by spray drying was heat-treated in air at temperatures from 1200 °C to 1400 °C 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 1300 °C. 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. |
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| Keywords: | nanocrystalline zirconia thermal barrier coating spray drying agglomeration nano-particle growth |
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