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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1414 (June) (2013)  >  pp.494-497

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1414 (June) (2013)   pp.494 - 497 Next article>>

Fabrication of transparent self-supporting alumina films by homogeneous precipitation process

Kazuhiro INOUE1), Hidemi KUREBAYASHI1), Masachika HAMA1), Yoshio KOBAYASHI1), Yusuke YASUDA2), Toshiaki MORITA2)
1) Department of Biomolecular Functional Engineering, College of Engineering, Ibaraki University 2) Hitachi Research Laboratory, Hitachi Ltd.

This paper reports fabrication of transparent self-supporting alumina films by using homogeneous precipitation and peptization processes. White precipitate of aluminum hydroxide was prepared with a homogeneous precipitation method using aluminum nitrate and urea in aqueous solution. The obtained aluminum hydroxide precipitate was peptized by using acetic acid at room temperature, which resulted in production of a transparent alumina sol. The alumina sol was transformed to an alumina gel film by drying the sol at room temperature. The alumina film was amorphous or fine crystallites even after annealed at a temperature as high as 500°C, and was crystallized to γ-Al2O3 at 900°C.


Keyword:
Alumina, Aluminum salt, Film, Homogeneous precipitation method, Sol–gel

Received: December 05, 2012
Accepted: March 23, 2013 , Published online: June 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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