Electrical properties of C/C and C/C–SiC ceramic fibre composites

The electrical properties of carbon/carbon (C/C) and carbon/carbon–silicon carbide (C/C–SiC) ceramic composites were measured. The results show that the capacitance decreases rapidly with an increase in frequency and it becomes constant above a frequency of 500 kHz, whereas the dissipation factor increases with increasing frequency. C/C–SiC composites give higher value than C/C composites due to the presence of microcracks.