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

Renaud Metz (1, 2) , Hocine Merini (1, 2) , Jean-Michel Reboul (3) , Jean-Louis Bantignies (1, 2) , Mehrdad Hassanzadeh (4)

1 L2C - Laboratoire Charles Coulomb
2 UM - Université de Montpellier
3 LUSAC - Laboratoire Universitaire des Sciences Appliquées de Cherbourg
4 SE - Schneider Electric

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

Mots clés: Silicon Carbide; Silicone; Nonlinear composite materials; Field grading material

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Renaud Metz, Hocine Merini, Jean-Michel Reboul, Jean-Louis Bantignies, Mehrdad Hassanzadeh. Contribution to the Percolation Threshold Study of Silicon Carbide Filled Polydimethylsiloxane Composites Used For Field Grading Application. Silicon, 2023, 15, pp.5297-5305. ⟨10.1007/s12633-023-02424-4⟩. ⟨hal-04118312⟩