Effect of the $SiO_2$ Addition on the Electrical and Degradation Property of Bi based ZnO Varistor

비스무스계 ZnO 바리스타의 $SiO_2$ 첨가에 따른 전기적특성 및 열화특성

Experimental results on the effect of $SiO_2$ addition to Bi based ZnO varistor show that secondary phases in microstructure and nonlinear coefficient are increased, and that leakage current is decreased with $SiO_2$ additive content. The varistor with 0.1 mol%-$SiO_2$ additive exhibits lower resistive current than other specimen at ($E_{1mA}$ x 0.6) applied voltage and temperature of $115^{\circ}C$ for 350h.