Macroporous alumina ceramics with aligned microporous walls by unidirectionally freezing foamed aqueous ceramic suspensions

He Jin Yoon, Uoong Chul Kim, Ji Hwan Kim, Young-Hag Koh, Won Young Choi, Hyoun Ee Kim

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

This paper reports a novel way of producing macroporous ceramics with aligned microporous walls by unidirectionally freezing foamed aqueous ceramic suspensions. The stability of the air bubbles introduced by magnetic stirring was improved remarkably using polyvinyl alcohol (PVA) as both a binder and emulsifying agent. Furthermore, the unidirectional freeze casting method could not only trap the air bubbles in the solidified sample successively but also induce the preferential growth of ice dendrites. This endowed the samples with uniform macropores surrounded by aligned microporous alumina walls after freeze drying and sintering. The sample produced with a PVA content of 8 wt% showed a high compressive strength of 4.6 ± 1.6 MPa at a high porosity of 91 vol%.

Original languageEnglish
Pages (from-to)1580-1582
Number of pages3
JournalJournal of the American Ceramic Society
Volume93
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

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Polyvinyl Alcohol
air bubble
Aluminum Oxide
Polyvinyl alcohols
Freezing
ceramics
aluminum oxide
freezing
alcohol
Suspensions
Alumina
freeze drying
macropore
Ice
Air
compressive strength
Compressive strength
Binders
Drying
Casting

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Macroporous alumina ceramics with aligned microporous walls by unidirectionally freezing foamed aqueous ceramic suspensions. / Yoon, He Jin; Kim, Uoong Chul; Kim, Ji Hwan; Koh, Young-Hag; Choi, Won Young; Kim, Hyoun Ee.

In: Journal of the American Ceramic Society, Vol. 93, No. 6, 01.06.2010, p. 1580-1582.

Research output: Contribution to journalArticle

Yoon, He Jin ; Kim, Uoong Chul ; Kim, Ji Hwan ; Koh, Young-Hag ; Choi, Won Young ; Kim, Hyoun Ee. / Macroporous alumina ceramics with aligned microporous walls by unidirectionally freezing foamed aqueous ceramic suspensions. In: Journal of the American Ceramic Society. 2010 ; Vol. 93, No. 6. pp. 1580-1582.
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