Preparation of Nano-sized Alumina Powders at Low Temperatures

Journal of Inorganic Materials

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Preparation of Nano-sized Alumina Powders at Low Temperatures

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

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

Abstract

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

CLC Number:

TB383

WU Yi-Quan,ZHANG Yu-Feng,HUANG Xiao-Xian,GUO Jing-Kun. Preparation of Nano-sized Alumina Powders at Low Temperatures[J]. Journal of Inorganic Materials.

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Preparation of Nano-sized Alumina Powders at Low Temperatures

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