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http://dx.doi.org/10.3740/MRSK.2005.15.3.143

Electrical Properties and Clamping Voltage Characteristics of ZPCCY-Based Varistor Ceramics  

Nahm Choon-Woo (Department of Electrical Engineering, Dongeui University)
Park Jong-Ah (Department of Electrical Engineering, Dongeui University)
Publication Information
Korean Journal of Materials Research / v.15, no.3, 2005 , pp. 143-148 More about this Journal
Abstract
The microstructure, electrical properties, and clamping voltage characteristics of $ZnO-Pr_6O_{11}-CoO-Cr_2O_3-Y_2O_3(ZPCCY)-based$ varistor ceramics sintered at $1350^{\circ}C$ were investigated as a function of sintering time from 1 to 3 h. With increasing sintering time, the average grain size and density increased in the range of $11.4\~16.0\;{\mu}m$ and $5.34\~5.54g/cm^3$, respectively, in accordance of increasing sintering time. The nonlinear exponent decreased in the range of $60\~26$ and the leakage current increased in the range of $1.3\~10.7\;{\mu}A$ with increasing sintering time. The clamping voltage ratio increased in the range $1.58\~1.65$ for ratio surge current of 10 A as the sintering time increased.
Keywords
varistor ceramics; ZPCCY-based; nonlinear exponent; surge current; clamping voltage ratio;
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Times Cited By KSCI : 4  (Citation Analysis)
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