Mechanism plasticity development for ceramic dough (part 1) - Microstructures of clay-water and alumina-water systems

Yukari Ichikawa, Hideki Ishida, Yasuo Shibasaki, Kiichi Oda

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Pore-size distributions and the microstructure of clay-water and alumina-water system were determined by mercury porosimetry and SEM observation to consider the relation between plasticity and packing structure of the dough. Bimodal distributions of pores were observed in size with submicron (s-pore) and severalmicron (1-pore) regions for the extrudable dough of clay-water system. Submicron pore group (s-pore) corresponded to inter-particle pores which exist among the primary particles. And the several-micron pore group (I-pore), which vanishes during drying process at 100°C, would be corresponded to inter-aggregate pores. The 1-pore has strong relation with extruding behavior of the dough: in the dough with higher extrudability, a larger amount of 1-pore was included and the 1-pore was obviously observed even at water contents lower than the plastic limit. On the other hand, monomodal distributions of pores by s-pore were characteristic for the unextrudable doughs of alumina-water system. It was estimated that the 1-pore, which is filled with water under wet condition, acts as the free space among the aggregate during extrusion to promote the deformation of a dough.

Original languageEnglish
Pages (from-to)1227-1231
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume106
Issue number12
DOIs
Publication statusPublished - 1998 Dec

Keywords

  • Alumina
  • Clay
  • Extrusion
  • Freeze-drying
  • Microstructure
  • Plasticity
  • Pore distribution

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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