Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (01): 79-83.doi: 10.3866/PKU.WHXB20050116

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Effect of Addition of Alumina Sol on γαPhase 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

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