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Investigation of partial discharge in piezoelectric ceramics

Hang, Tian and Glaum, Julia and Genenko, Yuri A. and Phung, Toan and Hoffman, Mark (2016):
Investigation of partial discharge in piezoelectric ceramics.
In: Acta Materialia, pp. 284-291, 102, ISSN 13596454,
[Online-Edition: http://dx.doi.org/10.1016/j.actamat.2015.09.031],
[Article]

Abstract

Electrical partial discharges were studied in different piezoelectric ceramics. Epoxy material with micro sized cavities was also tested and compared to the piezoelectric ceramics. It is found that compared to epoxy, partial discharge (PD) occurs at relatively lower electric fields for piezoelectric ceramics. The PD inception voltage was found to be lower for materials with higher relative permittivity. This indicates that the intensification of the electric field within the defects is the main cause for the differences in inception field observed for epoxy compared to piezoelectric ceramics. Furthermore, phase resolved PD pattern analysis was carried out for all materials at elevated electric fields. A broad distribution of the discharge event was observed for both epoxy and hard PZT samples, whereas for soft PZT discharge occurs concentrated at electric fields slightly above the coercive field. This intensification of PDs close to the coercive field suggests that PDs may be enhanced due to an increase of the internal field and electron emission rate induced by the domain switching process.

Item Type: Article
Erschienen: 2016
Creators: Hang, Tian and Glaum, Julia and Genenko, Yuri A. and Phung, Toan and Hoffman, Mark
Title: Investigation of partial discharge in piezoelectric ceramics
Language: English
Abstract:

Electrical partial discharges were studied in different piezoelectric ceramics. Epoxy material with micro sized cavities was also tested and compared to the piezoelectric ceramics. It is found that compared to epoxy, partial discharge (PD) occurs at relatively lower electric fields for piezoelectric ceramics. The PD inception voltage was found to be lower for materials with higher relative permittivity. This indicates that the intensification of the electric field within the defects is the main cause for the differences in inception field observed for epoxy compared to piezoelectric ceramics. Furthermore, phase resolved PD pattern analysis was carried out for all materials at elevated electric fields. A broad distribution of the discharge event was observed for both epoxy and hard PZT samples, whereas for soft PZT discharge occurs concentrated at electric fields slightly above the coercive field. This intensification of PDs close to the coercive field suggests that PDs may be enhanced due to an increase of the internal field and electron emission rate induced by the domain switching process.

Journal or Publication Title: Acta Materialia
Volume: 102
Uncontrolled Keywords: Piezoelectric ceramics; Partial discharge; Relative permittivity
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Oct 2015 09:04
Official URL: http://dx.doi.org/10.1016/j.actamat.2015.09.031
Identification Number: doi:10.1016/j.actamat.2015.09.031
Funders: T.H. acknowledges fi nancial support from a UNSW Tuition Fee Scholarship. J.G. was supported by the Australian Research Council Discovery Early Career Researcher Award (DE120102644). The authors gratefully acknowledge Dr. Peter Bryant and Thales Under-, water Systems Pty Ltd Australia for assistance and supply of samples. Liu Zhenyu from the School of Electrical Engineering and Telecommunications, UNSW Australia is thanked for the assistance with PD testing.
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