Review of Nonlinear Conductivity Theory Research of Modified Composite Materials

Nonlinear conductivity dielectric is widely used today to solve high energy discharge problems in many fields (such as spacecraft charging and motor insulation). This paper summarized the research about the nonlinear conductivity theory of composite materials. In particular, the key issues about nonlinear conductivity studies of composite materials are proposed. The nonlinear conductivity mechanisms of two typical filler particles (SiC and ZnO) are introduced. In addition, two kinds of nonlinear conductivity theory, including the traditional dielectric conduction theory and the polymer conduction theory, are reviewed. Several mechanisms in each of the conduction theories are analyzed, and also, the advantages and disadvantages of these theories are presented in detail. Thus, the purpose of this paper is to let the researchers know the nonlinear conductivity research status fully. We believe this paper is of great significance for the nonlinear dielectric conductivity researchers.