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Epoxy composite is expected to become the substrate insulation of gate bipolar transistors (IGBTs) that can replace ceramics if it has high thermal conductivity. Fillers with high thermal conductivity were added to the epoxy resin, while this composite often suffers from lowering in breakdown (BD) strength. In order to reveal the above phenomena and to clarify the breakdown (BD) mechanism, we carried...
PD (partial discharge) resistance is prominent in polymer nanocomposites, which is enhanced by nano- segmentation of matrices, tight coupling in interfaces, and pile-up of nano fillers on surfaces. Treeing resistance is determined by partial dielectric breakdown of solids to produce initial trees followed by widening and extending hollow channels due to internal PDs. Therefore, treeing turns out to...
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