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Improvement on the degradation of microwave sintered ZnO varistors by postannealing

Published online by Cambridge University Press:  31 January 2011

Chang-Shun Chen ,
Cheng-Tzu Kuo  and
I-Nan Lin
Chang-Shun Chen
Affiliation:
Department of Mechanical Engineering, HWA-HSIA College of Technology and Commerce, Taipei 235, Taiwan, Republic of China
Cheng-Tzu Kuo
Affiliation:
Institute of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan, Republic of China
I-Nan Lin
Affiliation:
Materials Science Center, National Tsing-Hua University, Hsinchu 30043, Taiwan, Republic of China
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Abstract

The microwave sintering process not only densified the ZnO materials in a higher rate, but also resulted in significantly better varistor characteristics. Large nonlinear coefficient and low leakage current density were attained by cooling the samples under a rate of 80 °C/min after sintering, followed by 600 °C postannealing for 60 min under oxygen atmosphere. Inappropriate annealing deteriorated the varistor characteristics that can either be attributed to the insufficient reoxidation along grain boundaries when annealed in N2 (or air) or loss of Zn species in these regions when annealed at 750 °C (900 °C). By contrast, the degradation behavior of these materials can be improved by the annealing process regardless of the annealing atmosphere or temperature.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1560 - 1567
Copyright
Copyright © Materials Research Society 1998

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