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Room-temperature gelcasting of alumina with a water-soluble copolymer

Published online by Cambridge University Press:  22 May 2013

Yan Yang ,
Shunzo Shimai  and
Shiwei Wang
Yan Yang
Affiliation:
R&D Center for Structural Ceramics and Composites, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, People’s Republic of China, 200050
Shunzo Shimai
Affiliation:
R&D Center for Structural Ceramics and Composites, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, People’s Republic of China, 200050
Shiwei Wang*
Affiliation:
R&D Center for Structural Ceramics and Composites, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, People’s Republic of China, 200050
*
a)Address all correspondence to this author. e-mail: swwang51@mail.sic.ac.cn
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Abstract

A novel and simple method for gelcasting of alumina was developed using a nontoxic and water-soluble copolymer of isobutylene and maleic anhydride (commercially called Isobam). In this method, there is requirement of only a small amount of Isobam (0.3 wt%) and neither initiators nor dispersants are needed for preparation and gelation of a 50 vol% solids loaded alumina slurry. The gelation rate increased with increasing solids loading but decreased with increasing Isobam content. A typical gelation time was 38 min for the slurry containing 50 vol% solids loading and 0.3 wt% Isobam. The resultant wet gel was strong enough to allow reversible bending and twisting. This simple gelling system is attractive for wet forming of ceramics because only a single additive, which acts as both dispersant and gelling agent at room temperature in air, is used.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 11 , 14 June 2013 , pp. 1512 - 1516
Copyright
Copyright © Materials Research Society 2013 

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