Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5438081 | Ceramics International | 2017 | 5 Pages |
Abstract
A process for generating highly porous α-Al2O3 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Kaline P. Furlan, Robert M. Pasquarelli, Tobias Krekeler, Martin Ritter, Robert Zierold, Kornelius Nielsch, Gerold A. Schneider, Rolf Janssen,