Contribution to the understanding of the relationship between mechanical and dielectric strengths of Alumina

The experimental evolutions of the Alumina dielectric strength versus thickness (127 μm to 2.54 mm), purity (92%, 96% and 99.5%) and crystallography (single or polycrystal) have been investigated. In order to find crucial information about the mechanism responsible for the dielectric breakdown, opti...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2010-11, Vol.30 (15), p.3117-3123
Main Authors: Malec, David, Bley, Vincent, Talbi, Fatiha, Lalam, Fadila
Format: Article
Language:English
Subjects:
Aluminum oxide
B. Failure analysis
Breakdown
C. Dielectric properties
Ceramics
Channels
Craters
D. Al 2O 3
Dielectric breakdown
Dielectric strength
E. Insulators
Electric potential
Evolution
Failure
Toughness
Voltage
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Summary:The experimental evolutions of the Alumina dielectric strength versus thickness (127 μm to 2.54 mm), purity (92%, 96% and 99.5%) and crystallography (single or polycrystal) have been investigated. In order to find crucial information about the mechanism responsible for the dielectric breakdown, optical and scanning electron micrograph observations have also been performed. Each breakdown channel was found to be terminated by a crater from which matter has been extracted during the breakdown process. Investigations have been focused on the breakdown path, on the evolution of the crater size versus sample thickness and on the location of molten matter after breakdown. The results tend to confirm that the dielectric breakdown of Alumina is probably originated from a mechanical failure induced by electromechanical forces acting during the voltage application.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.07.024