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Drying-induced forming of alumina ceramics using high solid-loaded slurries with addition of glycerol

Published online by Cambridge University Press:  03 March 2011

S.W. Jiang ,
S. Nakamura ,
S. Tanaka  and
K. Uematsu
S.W. Jiang
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
S. Nakamura
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
S. Tanaka
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
K. Uematsu*
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
*
a) Address all correspondence to this author. e-mail: uematsu@vos.nagaokaut.ac.jp
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Abstract

A new drying-induced forming (DIF) of ceramics has been developed using high solid-loaded alumina slurries with addition of glycerol, in which the slurry was simply dried in an open mold at the ambient condition. The drying-induced forming approach is facilitated by the high stability of concentrated slurries during drying where glycerol was added to maximize the critical solid loading and play simultaneously as a drying control agent. The drying and rheological behaviors of slurries were examined with respect to the glycerol addition. A slurry of 60 vol% solid loading with 20 wt% glycerol addition was chosen for the drying induced forming test. The green samples exhibited no bending or cracks, and a small degree of shrinkage anisotropy during sintering. The sintered samples showed a high relative density of 99.2% and an average strength of 420 MPa. We demonstrate here a possibility of producing near-net-shaped and bulk ceramic components in a simple scheme by using the drying-induced approach.

Keywords

CeramicSlurry
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 1 , January 2007 , pp. 244 - 248
Copyright
Copyright © Materials Research Society 2007

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References

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