Investigation on the Nonlinear Conductance Characteristics of Silicone Rubber Composites
ZHANG Wuxin, LI Zhiheng, ZHOU Meilin, YIN Yu, LIU Lingyun
Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China
Abstract: In view of the uneven distribution of electric fields in many insulating devices, it is effective to make use of nonlinear conducting materials as field grading materials. In this work we employed T-ZnOw as inorganic fillers, and the silicone rubber as matrix. T-ZnOw/silicone rubber composites with different volume fractions were prepared, and their electrical conductivity, dielectric properties and stretching strength were measured. The results show that the percolation threshold of the composite is about 5vol%. Only when the volume fraction of T-ZnOw is above 5%, the composite materials can exhibit excellent nonlinear conductance characteristics. When a certain field strength value (critical field strength E0) is reached, the electrical conductivity can be rapidly increased, which shows an apparent nonlinear conductivity. As the increase of volume fraction of T-ZnOw, the E0 of the nonlinear electrical conductivity of the composite decreases correspondingly. The dielectric constants of the composite increase with the volume fraction of T-ZnOw. The tensile strength of the composite materials can be improved with an appropriate volume fraction.
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