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 journalArticlepeer-review

28 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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Macroporous alumina ceramics with aligned microporous walls by unidirectionally freezing foamed aqueous ceramic suspensions'. Together they form a unique fingerprint.

Cite this