Highly porous α-Al 2 O 3 ceramics obtained by sintering atomic layer deposited inverse opals

Kaline P. Furlan, Robert M. Pasquarelli, Tobias Krekeler, Martin Ritter, Robert Zierold, Kornelius Nielsch, Gerold A. Schneider & Rolf Janßen
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...