Furlan, Kaline P.Kaline P.FurlanPasquarelli, Robert M.Robert M.PasquarelliKrekeler, TobiasTobiasKrekelerRitter, MartinMartinRitterZierold, RobertRobertZieroldNielsch, KorneliusKorneliusNielschSchneider, Gerold A.Gerold A.SchneiderJanßen, RolfRolfJanßen2018-05-152018-05-152017-05-26Ceramics International 14 (43): 11260-11264 (2017)http://tubdok.tub.tuhh.de/handle/11420/1643A 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.en027288422017141126011264Elsevierhttps://creativecommons.org/licenses/by/4.0/sinteringelectron microscopyporosityAl 2 O 3IngenieurwissenschaftenJournal Articleurn:nbn:de:gbv:830-8822067310.15480/882.164011420/164310.1016/j.ceramint.2017.05.17610.15480/882.1640Other