Characterization of ZnO-Based Multilayer Varistor Sintered by Hot-Press Sintering

概要

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To attain the homogeneous microstructure of ZnO-based multilayer varistors (MLVs), hot-press sintering is conducted. To determine the effect of hot-press sintering on the microstructure, the dielectric and varistor properties of ZnO-based MLVs were investigated and compared with those of ZnO-based MLVs fabricated by free sintering. In hot-press sintering, the average grain size and the distribution of grain size of a ZnO-based MLVs are both reduced. The results show that the leakage current and nonlinear coefficient ($ \alpha $) of ZnO-based MLVs can be improved. The increase in nonlinear coefficient ($ \alpha $) is directly related to the inhibition of grain growth of ZnO grains when hot-press sintering is performed instead of free sintering. Note that the energy absorption capabilities in terms of peak current (PC) measurements of ZnO-based MLVs are remarkably improved due to the homogeneity of microstructure when hot-press sintering is conducted.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-04-15