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Highly porous α-Al 2 O 3 ceramics obtained by sintering atomic layer deposited inverse opals
Citation Link: https://doi.org/10.15480/882.1640
Publikationstyp
Journal Article
Date Issued
2017-05-26
Sprache
English
TORE-DOI
Journal
Volume
43
Issue
14
Start Page
11260
End Page
11264
Citation
Ceramics International 14 (43): 11260-11264 (2017)
Publisher DOI
Scopus ID
Publisher
Elsevier
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.
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.
Subjects
sintering
electron microscopy
porosity
Al 2 O 3
DDC Class
620: Ingenieurwissenschaften
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