Shape forming of aqueous alumina slurries by freeze-drying

Abstract

The consolidation of dense aluminum oxide parts in aqueous suspension by pressure-less slurry casting and subsequent freeze-drying was developed. A water solidification modifier, glycerol, was utilized to eliminate the defects associated with the expansion and solute rejection of water during freezing. The effects of sintered density and microstructure were compared as a function of green density and alumina solids loading. Alumina slurries were characterized by viscosity measurements depending on the glycerol concentration and the solids loading. Frozen parts were dried under vacuum by sublimation of ice to obtain green bodies. High solids loading slurries, > 57.5 vol%, and glycerol additions were essential to achieve highly dense alumina bodies with a uniform microstructure.

Department(s)

Materials Science and Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 Wiley-Blackwell; American Ceramic Society, All rights reserved

Publication Date

2000-04-01

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