A primary concern in recent nanocomposite research is practical application. In this study, various kinds of epoxybased nanocomposites were made and their properties evaluated to determine their applicability as insulating materials for heavy electric apparatuses. Experimental results demonstrated that nano-fillers enhance insulation breakdown properties in nanocomposites. Moreover, nano-and micro-filler combinations were adopted as an approach toward practical application of nanocomposite insulating materials. These nano-and microfiller mixed composites had the same low thermal expansion as aluminum, and insulation breakdown properties superior to those of conventional insulating materials. Consequently, an aluminum conductor and a vacuum interrupter were molded by the nano-and micro-filler mixed composites for the first time in nanocomposite research.
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