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无机材料学报

无机材料学报

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低温制备纳米α-Al2O3粉体

吴义权; 张玉峰; 黄校先; 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷及超微结构国家重点实验室, 上海 200050
  • 收稿日期:2000-04-05 修回日期:2000-04-20 出版日期:2001-03-20 网络出版日期:2001-03-20

Preparation of Nano-sized Alumina Powders at Low Temperatures

WU Yi-Quan; ZHANG Yu-Feng; HUANG Xiao-Xian; GUO Jing-Kun   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2000-04-05 Revised:2000-04-20 Published:2001-03-20 Online:2001-03-20

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1011

摘要： 研究了以 Ａｌ（ＮＯ３）３·９Ｈ２Ｏ和ＮＨ３·Ｈ２Ｏ溶液为原料，采用高纯氧化铝球磨原位引入晶种和添加 ＺｎＦ２、 ＡｌＦ３的制备工艺．通过提高凝胶中晶种的均匀性和加速相转变时物质的扩散和传输，可降低过渡型氧化铝向α型氧化铝相转变温度，所制铝凝胶经９００～９２０℃煅烧可获得平均粒径＜５０ｎｍ的α型纳米氧化铝．

关键词: 氧化铝, 相变, 纳米粉体

Abstract: Alpha alumina nanocrystalline powders, with mean particle size less than 50nm, were prepared by a novel synthesis process using Al(NH3)3·9H2O and NH3·H2O solutions as raw materials. The process mainly utilized a seed-effect of fine grains worn from the milling mediums and also utilized ZnF2 or AlF3 additives. The phase transformation temperatures to alpha alumina can be reduced dramatically to 900-920℃ by improving the homogeneity of seeds with the hydrous alumina and accelerating the mass diffusivity and transportation in the transformation process.

Key words: alumina, phase transformation, nanometer powders

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