Relations between Electrical Breakdown Field and Mechanical Properties of Ceramics

Tipo de material: Texto

TextoSeries ; IEEE Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena, p.278-281, 1995Trabajos contenidos:

Carabajar, S
Olagnon, C
Fantozzi, G
Le Gressus, C

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Resumen: The relationship between mechanical properties and electric breakdown has been investigated For this purpose, different ceramics, alumina with 2 grain sizes, zirconia, silicon nitride and mullite have been measured in terms of critical field and mechanical properties. The study has been conducted from a fracture mechanics point of view, i.e. rupture occurs from pre-existing flaws. The results show that different parameters play a role in the value of the critical field. The importance of the microstructure is demonstrated with the 2 aluminas that come from the same processing batch. Finally, the results are qualitatively described by a simple model based on the Griffith criterion.

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The relationship between mechanical properties and electric breakdown has been investigated For this purpose, different ceramics, alumina with 2 grain sizes, zirconia, silicon nitride and mullite have been measured in terms of critical field and mechanical properties. The study has been conducted from a fracture mechanics point of view, i.e. rupture occurs from pre-existing flaws. The results show that different parameters play a role in the value of the critical field. The importance of the microstructure is demonstrated with the 2 aluminas that come from the same processing batch. Finally, the results are qualitatively described by a simple model based on the Griffith criterion.

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