Abstract
High-temperature solid phase sintering method was used to prepare high gradient SnO2–ZnO–Ta2O5 based varistor ceramics doped with In2O3 and Mn2O3. We studied the microstructure and electrical characteristics of the obtained experimental samples by scanning electron microscope imaging, voltage current and capacitance voltage measurement, and X-ray diffraction. When the doped amount of Mn2O3 was fixed at 0.1mol%, a small amount of In2O3 doped could significantly improve the voltage gradient and suppress the leakage current of the sample, and slightly improved the nonlinear performance. The doped In2O3 solidly dissolved in the SnO2 lattice that improved the potential barrier in the grain boundary region. The SnO2 varistor samples showed optimal performance at a composition of 0.1 mol% Mn2O3, 0.06 mol% In2O3. This sample exhibited a nonlinear coefficient of 34, a voltage gradient of 855 V/mm, and a leakage current of 9.4 mA/cm2. The findings of this study could help to improve the protective effects of electric porcelain lightning arrester assembled from SnO2 ceramic varistors and enhance the stability of power systems.
Published Version
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