Bi-directional freeze casting of porous alumina ceramics: a study of the effects of different processing parameters on microstructure

Sana Algharaibeh*, Anthony Ireland, Bo Su

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)
252 Downloads (Pure)

Abstract

Highly aligned lamellar ceramic scaffolds were produced using a bi-directional freeze casting technique. A specially designed, sloped copper mould was covered with a polymer to modulate the temperature field. Effects of different processing parameters (cooling rate, mould slope angle, ceramic solid loading and binder concentration) on lamellar orientation were systematically studied. The results showed that freezing under a dual temperature gradient produced highly aligned ceramic scaffolds. Increasing both the cooling rate and the mould slope angle increased the size of the ordered ceramic region. Using different alumina solid loadings in the initial suspension had little effect on the aligned lamellar structure. Increasing the binder concentration affected ice crystal growth in a highly aligned direction. Therefore, freeze casting using a dual temperature gradient can be used to fabricate highly aligned porous materials.

Original languageEnglish
JournalJournal of the European Ceramic Society
Early online date21 Sep 2018
DOIs
Publication statusE-pub ahead of print - 21 Sep 2018

Keywords

  • Alumina
  • Bi-directional freeze casting
  • Highly aligned lamellar structure
  • Microstructure

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