Properties of ZnO Varistors Prepared with Nano-Sized Powders


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ZnO varistors with higher voltage gradients are expected in the power system, and the key to this property is to diminish the grain size. In this paper, nano-sized ZnO particles are used as the raw material in order to obtain small grains. Pellets are fabricated by two sintering methods: the conventional pressureless sintering and the spark plasma sintering (SPS). For the samples fabricated by the conventional sintering, the average grain size varies from 1 μm to more than 10 μm when the sintering temperature changes from 900 oC to 1200 oC. The voltage gradient can reach as high as 2020 V/mm. The grain size of the SPS samples is less than 1 μm, and the voltage gradients can reach 963 V/mm.



Key Engineering Materials (Volumes 368-372)

Edited by:

Wei Pan and Jianghong Gong




F. C. Luo et al., "Properties of ZnO Varistors Prepared with Nano-Sized Powders", Key Engineering Materials, Vols. 368-372, pp. 514-516, 2008

Online since:

February 2008