Preparation and properties of porous alumina ceramics with oriented cylindrical pores produced by an extrusion method

Toshihiro Isobe, Takahiro Tomita, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

Porous alumina ceramics with unidirectionally-oriented pores were prepared by extrusion. Carbon fibers of 14 μm diameter and 600 μm length to be used as the pore-forming agent were kneaded with alumina, binder and dispersing agent. The resulting paste was extruded, dried at 110 °C, degreased at 1000 °C and fired at 1600 °C for 2 h. SEM showed a microstructure of dispersed highly oriented pores in a dense alumina matrix. The pore area in the cross section was 25.3% with about 1700 pores/mm2. The pore size distribution of the fired body measured by Hg porosimetry showed a sharp peak corresponding to the diameter of the burnt-out carbon fibers. The resulting porous alumina ceramics with 38% total porosity showed a fracture strength of 171 MPa and a Young's modulus of 132 GPa. This strength is significantly higher than the reported value for other porous alumina ceramics even though the present pore size is much larger.

Original languageEnglish
Pages (from-to)957-960
Number of pages4
JournalJournal of the European Ceramic Society
Volume26
Issue number6
DOIs
Publication statusPublished - Jan 24 2006
Externally publishedYes

Keywords

  • AlO
  • Extrusion
  • Mechanical properties
  • Porous ceramics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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