Dielectric and magnetic properties of Fe@FexOy/epoxy resin nanocomposites as high-performance electromagnetic insulating materials

摘要

The (Fe@FexOy)/epoxy resin (ER) composites are fabricated and their dielectric and magnetic properties are systematically investigated in order to acquire the high-performance electromagnetic insulating materials. Fe@FexOy nanoparticles with core-shell structure are prepared using an oxidation process. The thickness of FexOy shell and soft magnetic properties of Fe@FexOy nanoparticles can be controlled by adjusting the oxidizing temperature (T-ox). The FexOy shell benefits the reduction of eddy current and the improvement of breakdown strength in their ER composites. With increasing T-ox, the dielectric constant of the composites increases because of the enhancement of duplex interfacial polarization. Besides, the real part of the complex magnetic permeability has a slight decrease, which might be due to the more domain wall movement. (C) 2015 Elsevier Ltd. All rights reserved.