Highly porous α-Al2O3 ceramics obtained by sintering atomic layer deposited inverse opals

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Erscheinungsjahr:
2017
Medientyp:
Text
Schlagworte:
  • Alumina
  • Calcination
  • Phase transformation
  • Silicon Carbide
  • Sintering
  • Ceramic Materials
  • Alumina
  • Calcination
  • Phase transformation
  • Silicon Carbide
  • Sintering
  • Ceramic Materials
Beschreibung:
  • A process for generating highly porous alpha-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 degrees 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 mu m, 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 alpha-alumina ceramics are considered to be ideal for filtration or catalysis applications.
  • 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.
Lizenz:
  • info:eu-repo/semantics/openAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/031f941b-9cbd-4eaf-9fd4-08e3cf4bc51f