无机材料学报

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共沸蒸馏法制备超细氧化铝粉体及其表征

彭天右; 杜平武; 胡斌; 江祖成   

  1. 武汉大学化学与环境科学学院化学系, 武汉 430072
  • 收稿日期:1999-11-26 修回日期:1999-12-16 出版日期:2000-12-20 网络出版日期:2000-12-20

Preparation of Nanoscale Alumina Powder by Heterogeneous Azeotropic Distillation Processing

PENG Tian-You; DU Ping-Wu; HU Bin; JIANG Zu-Cheng   

  1. Department of Chemistry; College of Chemistry and Environment Science; Wuhan University) Wuhan 430072; China
  • Received:1999-11-26 Revised:1999-12-16 Published:2000-12-20 Online:2000-12-20

摘要: 用改进的溶胶-凝胶法(sol-gel)制备了单分散纳米级Al粉体,研究了不同干燥方法对产品粒子性能的影响.结果表明,共沸蒸馏法能够有效地对氢氧化铝凝胶脱水,防止了硬团聚体的形成.在1150℃的温度下煅烧,可制得尺寸分布均匀、呈球形的α-Al超细粉体,其平均粒径为68nm.以透射电镜(TEM)、X射线衍射(XRD)、热重(TG)、差热(DTA)、比表面测定(BET)等手段对所得的超细Al粉体进行了表征.

关键词: 溶胶-凝胶法, Al2O3粉体, 共沸蒸馏, 团聚体

Abstract: Nanoscale alumina powders were successfully prepared by an improved sol-gel method. Effects of different drying methods on prepared grain properties
were studied. The results show that heterogeneous azeotropic distillation processing can dehydrate effectively during gel drying, and prevent the
formations of agglomeration. The products were identified by TEM, XRD, BET, TG and DTA. Al2O3 powders with nanoscale sizes (about 68nm), homogeneous
disperse, better sphere and low impurity content were obtained, meanwhile, the dried gel powders can be converted to α-phase completely at lower
temperature (1150℃) and shorter time (30 min).

Key words: sol-gel method, nanoscale alumina, heterogeneous azeotropic distillation processing, agglomerations

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