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Materials 2018, 11(9), 1590;

Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites

Key Laboratory of Engineering Dielectric and its Application, Ministry of Education, College of Electrical and Electronics Engineering, Harbin University of Science and Technology, Harbin 150040, China
College of Science, Harbin University of Science and Technology, Harbin 150040, China
Author to whom correspondence should be addressed.
Received: 10 August 2018 / Revised: 21 August 2018 / Accepted: 28 August 2018 / Published: 2 September 2018
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Researches of the theories and application of polymer composites with nonlinear conductivity are useful for dealing with the nonuniform electrical fields widely existing in the cable accessory insulation. In the present work, we fabricated CCTO (CaCu3Ti4O12)/EPDM (Ethylene Propylene Diene Monomer) composites and investigated their breakdown strength, dielectric and nonlinear conductivity properties in detail; the microstructures of fillers and composites were characterized by scanning electron microscopy (SEM) and X-ray diffraction. CCTO particles are uniformly dispersed in CCTO/EPDM composites, and the composites showed nonlinear conductivity with electric field changes. When the CCTO particle content is low, the conductivity of CCTO/EPDM composites does not present obvious nonlinearity. However, when CCTO content exceeds 2 vol %, the conductivity experiences a nonlinear change with increasing electric field strength and the threshold field (Eth) of nonlinear conductivity declines with the increase of CCTO contents. In addition, it can be found from experiment and simulation results that 8 vol % CCTO/EPDM exhibit significant nonlinear conductivity and dielectric properties as expected, and homogenizing the electrical field much more effectively. Therefore, this paper offers a preliminary discussion about the variation trend of nonlinear conductivity CCTO/EDPM composites, providing an effective reference to solve the application of nonlinear conductivity materials for cable accessories. View Full-Text
Keywords: copper calcium titanate; nonlinear conduction; electric field simulation; breakdown copper calcium titanate; nonlinear conduction; electric field simulation; breakdown

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Li, Z.; Zhao, H.; Zhang, C. Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites. Materials 2018, 11, 1590.

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