Ceramic shape forming by freeze drying of aqueous and non-aqueous slurries

Abstract

Concepts for aqueous injection molding have been developed to process complex ceramic shapes using a minimum amount of binder ( < 1 vol%). Some advantages of this technique include fast slurry preparation, low binder content and fast heating rates during pre-sintering. Freeze drying of parts made from aqueous slurries reveals large microstructural voids that are related to the expansion and separation of water from the solid upon freezing. In this work, the effect of a suitable non-aqueous solvent on the microstructure of freeze- dried parts has been studied. Highly dense and uniform microstructures in PLZT ceramics were achieved after sintering. The effects of aqueous and non-aqueous slurries on the microstructural development of freeze-dried green and sintered bodies will be presented. (Example material: lead lanthanum zirconium titanate.)

Department(s)

Materials Science and Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Publication Date

1994-04-01

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