Nonlinear Conductivity Theory Research of Composite Materials

Composite materials with nonlinear conductivity characteristics are widely used to solve the problem of electric field concentration in the insulation of cable accessories. In this paper, the conductive mechanism and influencing factors of related inorganic conductive particles and polymer matrix are systematically summarized, especially the key problems in the study of nonlinear conductivity of composite materials are put forward. Several mechanisms and applicable conditions in various conduction theories are analyzed, and the effects of filler type, content and temperature on the conductivity of composites are illustrated with examples. Then, the research progress of nonlinear conductivity theory of composite materials is reviewed, and the co-blending of single filler with multi-dimension filler and its application in nonlinear conductive materials are introduced. The purpose of this paper is to give researchers a full understanding of the current research status of nonlinear conductivity. We believe that this work is of great significance for the study of nonlinear conductivity.