Epoxy-Based SiC Composites with Non-Linear Electrical Properties for Field Grading Applications

Different methods of dispersion for fabrication of SiC/epoxy resin composites were studied in order to obtain an homogeneous filler dispersion. Composites with different filler concentration were also fabricated in order to develop the nonlinear electrical conductivity. The filler concentration was between 0-30 vol%. The thickness of composites was 300 μm. The composites were characterized using a current-voltage technique with an applied voltage between 35-12500 V. The effects of the filler concentration in the nonlinear behavior of materials is presented.