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Publisher DOI: 10.1016/j.ceramint.2017.05.176
Title: Highly porous α-Al 2 O 3 ceramics obtained by sintering atomic layer deposited inverse opals
Language: English
Authors: Furlan, Kaline P. 
Pasquarelli, Robert M. 
Krekeler, Tobias 
Ritter, Martin  
Zierold, Robert 
Nielsch, Kornelius 
Schneider, Gerold A. 
Janßen, Rolf 
Keywords: sintering;electron microscopy;porosity;Al 2 O 3
Issue Date: 26-May-2017
Publisher: Elsevier
Source: Ceramics International 14 (43): 11260-11264 (2017)
Journal or Series Name: Ceramics international 
Abstract (english): 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.
DOI: 10.15480/882.1640
ISSN: 02728842
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
Project: SFB 986: Zentralprojekt Z3 - Elektronenmikroskopie an multiskaligen Materialsystemen 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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