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Constrained sintering of alumina stripe patterns on rigid substrates: Effect of stripe geometry

Jamin, Christine and Rasp, Tobias and Kraft, Torsten and Guillon, Olivier (2013):
Constrained sintering of alumina stripe patterns on rigid substrates: Effect of stripe geometry.
In: Journal of the European Ceramic Society, pp. 3221-3230, 33, (15-16), ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2013.06.016],
[Article]

Abstract

The sintering behaviour of alumina stripes deposited on sapphire substrates by micromolding in capillaries – a soft lithographic method – with lateral dimensions from 10 to 500 μm and thicknesses between 7 μm and 32 μm was studied. Unlike in continuous films, the lateral sintering strain is not negligible, thus reducing the constraint imposed by the substrate. Lateral shrinkage depends on the stripe width and thickness. The degree of constraint exerted on alumina stripes by a rigid sapphire substrate was investigated by comparing the lateral and vertical strains and is found to be dependent on stripe geometry. The formation of a delaminated, highly dense edge zone was observed at the free boundaries. Its influence on overall densification and local density distribution depends on its extension compared to the total film width. A gradient in local density was found that varied both with stripe thickness and width as predicted by finite element and discrete element simulations.

Item Type: Article
Erschienen: 2013
Creators: Jamin, Christine and Rasp, Tobias and Kraft, Torsten and Guillon, Olivier
Title: Constrained sintering of alumina stripe patterns on rigid substrates: Effect of stripe geometry
Language: English
Abstract:

The sintering behaviour of alumina stripes deposited on sapphire substrates by micromolding in capillaries – a soft lithographic method – with lateral dimensions from 10 to 500 μm and thicknesses between 7 μm and 32 μm was studied. Unlike in continuous films, the lateral sintering strain is not negligible, thus reducing the constraint imposed by the substrate. Lateral shrinkage depends on the stripe width and thickness. The degree of constraint exerted on alumina stripes by a rigid sapphire substrate was investigated by comparing the lateral and vertical strains and is found to be dependent on stripe geometry. The formation of a delaminated, highly dense edge zone was observed at the free boundaries. Its influence on overall densification and local density distribution depends on its extension compared to the total film width. A gradient in local density was found that varied both with stripe thickness and width as predicted by finite element and discrete element simulations.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 33
Number: 15-16
Uncontrolled Keywords: Thick film; Simulation; Micromolding in capillaries; Constrained sintering; Alumina
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 Sep 2013 09:18
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2013.06.016
Identification Number: doi:10.1016/j.jeurceramsoc.2013.06.016
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