Abstract
With the new energy reform, higher requirements for the safety of power transmission are put forward, in which SnO2 varistors play an important role. In this paper, samples were prepared by liquid-phase sintering method, and by means of current-voltage, scanning electron microscopy, capacitance-voltage, X-ray diffraction, and impedance spectroscopy tests, it was found that doping Cu could reduce the porosity of SnO2 varistors and improve the densities of SnO2 varistors and exceed the theoretical density. And the effect of doping with different CuO contents on the electrical properties of SnO2 varistors was also investigated. The results show that when the Cu doping amount is 0.04 mol%, the sample has the best electrical properties with voltage gradient of 761.62 V/mm, leakage current of 5.51 μA/cm2, nonlinear coefficient of 32.78, and grain boundary resistance of 71.8 kΩ. It can better suppress the leakage current and improve the stability of the SnO2 varistor in actual operation.
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