物理化学学报 >> 2005, Vol. 21 >> Issue (01): 79-83.doi: 10.3866/PKU.WHXB20050116

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氧化铝胶体的添加对氧化铝γ→α相变的影响

吴玉程;杨晔;李勇;崔平   

  1. 合肥工业大学材料学院,合肥　230009; 中国科学院固体物理研究所纳米技术中心,合肥　230031
  • 收稿日期:2004-05-09 修回日期:2004-06-20 发布日期:2005-01-15
  • 通讯作者: 吴玉程 E-mail:ycwu@hfut.edu.cn

Effect of Addition of Alumina Sol on γ→αPhase Transformation of Ultrafined Alumina

WU Yu-Cheng;YANG Ye;LI Yong;CUI Ping   

  1. Faculty of Materials Science ＆ Engineering, Hefei University of Technology, Hefei　230009; Nano Science ＆ Technology Center, Institute of Solid State Physics Chinese Academy of Sciences, Hefei　230031
  • Received:2004-05-09 Revised:2004-06-20 Published:2005-01-15
  • Contact: WU Yu-Cheng E-mail:ycwu@hfut.edu.cn

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摘要： 在γ-Al2O3粉体中添加氧化铝胶体,研究其对氧化铝α相变的影响.结果表明,与α氧化铝粉体籽晶相比较,氧化铝胶体也可以起到籽晶的作用;由于其颗粒较小、在γ-Al2O3中分散均匀且能与之紧密接触,大大降低了α相变温度,改善了煅烧产物的微结构,从而得到分散均匀、平均粒径< 100 nm的α氧化铝超细粉体.根据对粉体形貌TEM的观察,初步探讨了添加氧化铝胶体的前驱体α相变的过程.

关键词: 超细, 氧化铝, 溶胶, 籽晶, α相变

Abstract: The effect of alumina sol on the α phase transformation in γ-alumina powder has been studied. In comparison with α-alumina seeds, the alumina sol can also act as seeds. Moreover, because of the small particle size and perfect dispersibility of the alumina sol, the α phase transformation temperature is decreased and, meanwhile, the microstructure of the produced powders is modified. So ultrafined powders with a particle size less than 100 nm were produced with good dispersibility. The α phase transformation of the alumina precursors with alumina sol doping was studied on the base of the TEM photographs of the produced powders.

Key words: Ultrafined, Alumina, Sol, Seeding, α phase transformation