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Anisotropic Microstructural Development During the Constrained Sintering of Dip-Coated Alumina Thin Films

Guillon, Olivier and Weiler, Ludwig and Rödel, Jürgen (2007):
Anisotropic Microstructural Development During the Constrained Sintering of Dip-Coated Alumina Thin Films.
In: Journal of the American Ceramic Society, pp. 1394-1400, 90, (5), ISSN 0002-7820,
[Online-Edition: http://dx.doi.org/10.1111/j.1551-2916.2007.01565.x],
[Article]

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.

Item Type: Article
Erschienen: 2007
Creators: Guillon, Olivier and Weiler, Ludwig and Rödel, Jürgen
Title: Anisotropic Microstructural Development During the Constrained Sintering of Dip-Coated Alumina Thin Films
Language: English
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.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 90
Number: 5
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:20
Official URL: http://dx.doi.org/10.1111/j.1551-2916.2007.01565.x
Identification Number: doi:10.1111/j.1551-2916.2007.01565.x
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