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High temperature behavior of monodisperse porosity in alumina films
Publikationstyp
Journal Article
Date Issued
2015-07-10
Sprache
English
TORE-URI
Volume
35
Issue
14
Start Page
3917
End Page
3926
Citation
Journal of the European Ceramic Society 14 (35): 3917-3926 (2015)
Publisher DOI
Scopus ID
Publisher
Elsevier Science
Understanding the sintering behavior of tailored porosity in thin-film ceramics is essential for applications in photonics, thermal coatings, catalysis, and electrodes. Alumina films exhibiting a random distribution of templated pores with monodisperse size were produced by spin coating from suspensions of alumina powder and polystyrene microspheres. The microstructural evolution, grain size, pore size, and their respective distributions were determined as a function of the initial volume fraction of templated pores, sintering temperature, and time. The behavior between grains and pores at the surface and in the bulk was evaluated and compared to other disordered and ordered porous alumina systems. Above a pore fraction threshold of ~9 vol%, increasing pore fractions retarded grain growth, with smaller grains observed between close pores. While the average bulk pore size did not change with sintering temperature, time, or pore fraction, it did produce a broader pore size distribution with different pore geometries.
Subjects
Alumina
Pore/porosity
Porous materials
Sintering
DDC Class
600: Technik
More Funding Information
Financial support from the German Research Foundation (DFG) via SFB 986 “M3“, projects C4 and C5.