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

Algharaibeh, Sana; Ireland, Anthony J.; Su, Bo

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.

• Journal Article Type: Article
• Acceptance Date: Sep 18, 2018
• Online Publication Date: Sep 21, 2018
• Publication Date: Feb 1, 2019
• Deposit Date: May 5, 2023
• Journal: Journal of the European Ceramic Society
• Print ISSN: 0955-2219
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 39
• Issue: 2-3
• Pages: 514-521
• DOI: https://doi.org/10.1016/j.jeurceramsoc.2018.09.030
• Keywords: Bi-directional freeze; Alumina; Microstructure; Highly aligned lamellar structure
• Public URL: https://uwe-repository.worktribe.com/output/10743849
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0955221918305910?via%3Dihub