Novel ceramic/camphene-based co-extrusion for highly aligned porous alumina ceramic tubes

Young Wook Moon, Kwan Ha Shin, Young Hag Koh, Se Won Yook, Cheol Min Han, Hyoun Ee Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We herein propose a novel way of producing highly aligned porous alumina tubes by co-extruding an initial feed rod, which comprised of a pure camphene core and a frozen alumina/camphene shell. This new and simple technique produced alumina tubes (∼4.4 ± 0.1 mm in outer diameter) having uniform alumina walls (∼1.1 ± 0.12 mm in thickness) with highly aligned pores, which were created by removing the extensively elongated camphene dendrites in the extruded alumina/camphene shell. Furthermore, the heat treatment of the extruded bodies at 33°C, which is close to the freezing point of the alumina/camphene slurry, led to a considerable increase in the size of the aligned pores formed in the alumina walls, from ∼<5 to ∼54 μm with increasing heat-treatment time from 0 to 6 h. The compressive strength also increased significantly from 21 ± 1.6 to 61 ± 11.6 MPa, which was attributed mainly to the achievement of well densified alumina walls.

Original languageEnglish
Pages (from-to)1803-1806
Number of pages4
JournalJournal of the American Ceramic Society
Volume95
Issue number6
DOIs
Publication statusPublished - 2012 Jun

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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