Porous alumina ceramics with highly aligned pores by heat-treating extruded alumina/camphene body at temperature near its solidification point

Young Wook Moon, Kwan Ha Shin, Young Hag Koh, Won Young Choi, Hyoun Ee Kim

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This study reports a novel way of increasing the pore size of highly aligned porous alumina ceramics by heat-treating an extruded alumina/camphene body at a temperature near its solidification point. The pore size obtained increased remarkably from 51 ± 8 to 125 ± 27 μm with increasing heat-treatment time from 1 to 24. h, due to the continuative overgrowth of the camphene dendrites during heat-treatment, while a highly aligned porous structure was preserved. In addition, interestingly, this heat-treatment enabled alumina walls to be densified quite well, whereas porous walls were observed in the sample produced without heat-treatment, which led to a considerable increase in compressive strength. The sample produced with a heat-treatment time of 12. h showed a high compressive strength of 11.6 ± 1.2. MPa at a porosity of approximately 84. vol%, which was much higher than that (0.28 ± 0.1. MPa) of the sample produced without heat-treatment.

Original languageEnglish
Pages (from-to)1029-1034
Number of pages6
JournalJournal of the European Ceramic Society
Volume32
Issue number5
DOIs
Publication statusPublished - 2012 May 1

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Keywords

  • A. Extrusion
  • C. Mechanical properties
  • D. Al O
  • E. Biomedical applications
  • Porous ceramics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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