Highly porous α-Al2O3 ceramics obtained by sintering atomic layer deposited inverse opals. Issue 14 (1st October 2017)

• Record Type: Journal Article
• Authors: Furlan, Kaline P.; Pasquarelli, Robert M.; Krekeler, Tobias; Ritter, Martin; Zierold, Robert; Nielsch, Kornelius; Schneider, Gerold A.; Janssen, Rolf
• Is Part Of: Ceramics international. Volume 43:Issue 14(2017)
• Page Start: 11260
• Page End: 11264
• Publication Date: 2017-10-01
• Subjects: A. Sintering B. Electron microscopy B. Porosity D. Al2O3; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.05.176
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A process for generating highly porous α-Al2 O3 ceramics has been developed. In this paper, a combination of self-assembly and atomic layer deposition is demonstrated as a means to fabricate inverse alumina opals, which have their structures transformed via sintering. The resulting highly porous structure is stable even after a 4 h dwell time at 1400 °C, in contrast to structures generated by conventional powder metallurgy, sol-gel or colloidal powder suspension infiltration methods. TEM analysis reveals that the structure consists of single grain domains of up to 3 µm, each containing a randomly interconnected network of alumina ligaments that share a common crystalline orientation, suggesting a different mechanism of grain boundary migration during sintering. These highly porous α-alumina ceramics are considered to be ideal for filtration or catalysis applications.