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Synthesis of Porous Ceramics with Complex Pore Structure by Freeze-Dry Processing

Authors


  • J. Brinker—contributing editor

  • Supported by AIST, MITI, Japan, as part of the Synergy Ceramics Project under the Industrial Science and Technology Frontier (ISTF) Program. Under the ISTF program, part of this work was supported by NEDO. The authors are members of the Joint Research Consortium of Synergy Ceramics.

Abstract

Porous ceramics with complex pore structure were synthesized by a freeze-dry process. Freezing-in of a water-based ceramics slurry was done while controlling the growth direction of the ice. Sublimation marks of the ice were generated by drying under reduced pressure. Porous ceramics having a complex pore structure were obtained by sintering the green body: aligned macroscopic open pores contained micropores in their internal walls. The pore structure was substantially affected by the starting slurry concentration and sintering temperature. The pore formation mechanism is discussed in relation to these effects.

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