Preparation of α-alumina ceramics: The use of boehmite sols as dispersing agents

A method is reported for the production of monolithic (400–500 g) alumina ceramics from slips of submicron α-alumina (Al 2O 3) powder using boehmite (AlOOH) sols as dispersion and sintering aids. Some commercial boehmite sols can be modified by acid and heat treatment so as to significantly improve...

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Bibliographic Details
Published in:Ceramics international 1991, Vol.17 (6), p.347-350
Main Authors: Kindl, Bruno, Carlsson, David J., Deslandes, Yves, Hoddenbagh, J.Mark A.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
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Summary:A method is reported for the production of monolithic (400–500 g) alumina ceramics from slips of submicron α-alumina (Al 2O 3) powder using boehmite (AlOOH) sols as dispersion and sintering aids. Some commercial boehmite sols can be modified by acid and heat treatment so as to significantly improve the dispersing ability of the sols toward α-alumina compared to an acid-only treated sol. In addition, shrinkages of less than 15% occurred on drying these slips. The ceramics obtained on sintering the dried slips have microhardness and toughness properties comparable to thosepreviously reported for fully densified α-alumina samples. The densities of the ceramics were all within 97% of the theoretical maximum. Differences between the heat-treated and untreated sols are proposed.
ISSN:0272-8842
1873-3956
DOI:10.1016/0272-8842(91)90032-U