首页|Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors
Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors
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NETL
NSTL
Trans Tech Publications Ltd
The effects of the addition of Y or both Y and Zr to Bi-Mn-Co-Sb-Si-Cr-Ni-added ZnO varistors on the varistor voltage and the tolerance characteristics of electrical degradation were investigated. The deterioration of the tolerance characteristics of electrical degradation by the addition of Y was probably caused by an increase in the number of willemite (Zn_2SiO_4)-type particles or a decrease in the number of spinel (Zn_(2.33)Sb_(0.67)O_4)-type particles, but this deterioration was reduced by adding Zr. Moreover, the reduction in the average ZnO grain size due to the addition of Y was a major factor in the increased varistor voltage, and the ZnO grain growth was inhibited by the formation of an unknown compound after adding Y. The varistor voltage of a varistor with 2 mol% added Y increased by approximately 50% compared to a varistor with no Y added.
ZnO varistorselectrical degradationZr additionY additiontolerance characteristics of electrical degradationvaristor voltage
NETL
NSTL
Trans Tech Publications Ltd
