Design Features of Silicon Carbide-doped Nonlinear Conductive Composites for Insulating Packages

doi:10.3901/JME.2025.02.097

Abstract

Abstract: With the continuous development of wide band gap(WBG) power semiconductor devices, the current voltage levels of high-voltage power devices have exceeded 20 kV, which brings new challenges to the insulation reliability of high-voltage power device packages. High-voltage power devices are susceptible to electric field concentration at the triple points, which can cause partial discharge leading to device insulation failure. Field-dependent conductivity(FDC) materials are considered to be the key to solve this problem. Although nonlinear conductive coatings have become an important solution for high-voltage packaging, the effect of the preparation method of nonlinear conductive coatings on their performance is not clear. In order to prepare and design nonlinear conductive coating materials with more excellent performance，in this paper, the effects of three main elements of non-linear conductive coating material design：matrix material, doping particles, and coating thickness on the properties of non-linear conductive coating material such as formability, temperature resistance, insulation and voltage resistance, coating bond strength, and its thermo-mechanical stress are briefly analyzed by finite element simulation and experimental comparison. By analyzing the laws of nonlinear coating material preparation schemes on several important properties of the materials，this study can provide guidance and solutions for the design and preparation of excellent and highly reliable nonlinear electroconductive coating materials.

Key words: power electronics, high voltage, power device, insulation, packaging

CLC Number:

TM215

SUN Kaibing, LI Xin, MEI Yunhui. Design Features of Silicon Carbide-doped Nonlinear Conductive Composites for Insulating Packages[J]. Journal of Mechanical Engineering, 2025, 61(2): 97-105.

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