Contribution to the Percolation Threshold Study of Silicon Carbide Filled Polydimethylsiloxane Composites Used For Field Grading Application

Nonlinear V-I characteristics of particulate composite prepared from dispersion silicon carbide in a siloxane elastomer have been measured as function filler concentration up to the maximum allowable about 32 vol.%. Two critical concentrations (percolation thresholds) are obtained at volume fractions 17 and 24 vol.% for low high electric fields. These values consistent with predicted by theory: 14 31 respectively may come edge face contacts between SiC semi-conducting particles.