Abstract
The energy-absorption capability of zinc oxide varistors depends on both the binder burn-out and shrinkage rate of the disc. This paper presents a study of the development of a failure model of a varistor disc with a nominal voltage V nom=5 kV and a diameter of 42 mm manufactured by rate-controlled sintering. The mathematical model has been developed in terms of the binder burn-out rate and the shrinkage rate for the electrical-energy capability during initial failure and 50% failure of the samples, to secure the optimum temperature profile for the sintering operation. The effect of the binder burn-out and the shrinkage rate has been investigated using design of experiments and response surface methodology (RSM). Response surface contours were constructed by computer, giving the response in terms of the binder burn-out rate and the shrinkage rate.
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