Microvaristors: Functional Fillers for Novel Electroceramic Composites |
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Authors: | F Greuter M Siegrist P Kluge-Weiss R Kessler L Donzel R Loitzl H J Gramespacher |
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Affiliation: | (1) ABB Switzerland Ltd., Corporate Research, CH-5405 Baden, Dättwil, Switzerland;(2) ABB Switzerland Ltd., High Voltage Products, CH-5430 Wettingen, Switzerland |
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Abstract: | Microvaristors are tiny electroceramic particles, which have highly nonlinear, voltage controlled electrical transport properties and can be used as active fillers in a variety of insulating matrix materials for functional composites. Due to the internal grain boundary structure, each individual microvaristor particle shows an IV-characteristics similar to the one known from bulk ceramics, except for the scaled down switching voltage. By controlling the material formulation, the particle morphology and the sintering conditions the switching characteristics of microvaristors can be tailored for specific applications.In the present paper the basic properties of ZnO microvaristors are described and it is shown how they impart their nonlinearity to the composite. A single microvaristor can withstand surprisingly high current loadings, without major changes in their electrical properties. Combined with the high manufacturing flexibility known from polymer processing, the varistor composites can be used for new solutions in overvoltage protection or control of electrical fields. |
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Keywords: | microvaristor nonlinear resistor functional composite overvoltage protection |
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