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J. Korean Ceram. Soc. > Volume 41(6); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(6): 464.
doi: https://doi.org/10.4191/kcers.2004.41.6.464
ZPCCY계 바리스터의 열화특성에 미치는 소결시간의 영향
남춘우, 박종아
동의대학교 전기공학과
Effect of Sintering Time on Degradation Characteristics of ZPCCY-Based Varistors
The electrical stability of ZPCCY-based varistors composing of ZnO-Pr$_{6}$O$_{11}$-CoO-C $r_2$ $O_3$- $Y_2$ $O_3$ ceramics were investigated in various DC accelerated aging stress with sintering times. Sintering time greatly affected electrical properties and stability. Sintering time decreased nonlinear exponent in the range of 51.2∼23.8 and increased leakage current in the range of 1.3∼5.6 ${mu}$A. The varistor sintered for 1 h exhibited high nonlinearity, whereas relatively low stability. On the contrary, the varistor sintered for 3 h exhibited low nonlinearity, whereas relatively high stability. But the varistor sintered for 2 h exhibited not only good nonlinearity, with nonlinear exponent of 38.6 and leakage current of 3.6 ${mu}$A but also high stability, in which the variation rates of varistor voltage, nonlinear exponent, leakage current, and dissipation factor are -0.80%, -1.81 %, +74.4%, and +0.88%, respectively.
Key words: ZPCCY, Sintering time, Nonlinearity, Stability, DC accelerated aging stress
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