Guillon, Olivier ; Weiler, Ludwig ; Rödel, Jürgen (2007)
Anisotropic Microstructural Development During the Constrained Sintering of Dip-Coated Alumina Thin Films.
In: Journal of the American Ceramic Society, 90 (5)
doi: 10.1111/j.1551-2916.2007.01565.x
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Alumina thin films were manufactured from aqueous slurries by dip coating. Film thickness as function of substrate withdrawal velocity could be correctly modeled by Landau and Levich's theory. Samples were sintered on a rigid substrate at 1350°C for different isothermal times to achieve relative densities from 84% to 97%. Microstructural analysis of polished cross sections revealed a continuous development of pore alignment, as expected by theoretical considerations. With increasing density pores become more anisometric and orientate along the thickness direction. A further preferential orientation of pores was found in the normal plane, apparently due to the coating process. Constraining conditions had less influence on the size and shape of the grains; they tend to become more equiaxed in the constrained plane, presumably due to the biaxial tensile stress state.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2007 |
| Autor(en): | Guillon, Olivier ; Weiler, Ludwig ; Rödel, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Anisotropic Microstructural Development During the Constrained Sintering of Dip-Coated Alumina Thin Films |
| Sprache: | Englisch |
| Publikationsjahr: | Mai 2007 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 90 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1111/j.1551-2916.2007.01565.x |
| Kurzbeschreibung (Abstract): | Alumina thin films were manufactured from aqueous slurries by dip coating. Film thickness as function of substrate withdrawal velocity could be correctly modeled by Landau and Levich's theory. Samples were sintered on a rigid substrate at 1350°C for different isothermal times to achieve relative densities from 84% to 97%. Microstructural analysis of polished cross sections revealed a continuous development of pore alignment, as expected by theoretical considerations. With increasing density pores become more anisometric and orientate along the thickness direction. A further preferential orientation of pores was found in the normal plane, apparently due to the coating process. Constraining conditions had less influence on the size and shape of the grains; they tend to become more equiaxed in the constrained plane, presumably due to the biaxial tensile stress state. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 18 Mai 2011 15:20 |
| Letzte Änderung: | 05 Mär 2013 09:47 |
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