Effect of Corona Aging on the Electrical Properties of SiC/epoxy Composites

The SiC/epoxy micro-composites are prepared, and the composites are subjected to corona aging under AC voltage to investigate the effects of different corona aging time on the composites electrical properties. The FTIR spectra show that the degradation of the composites is mainly caused by the breakage of ether bonds. The dielectric spectra show that the corona aging causes the reduce in the relative permittivity and loss tangent. The DC conductivity measurements show that the aging lead to the increase in the current density, and to enhance the nonlinear conductivity characteristics. Weibull distribution of breakdown strength show that the scale paramter of breakdown strength increases and then decreases with increasing aging time.