Thermo-oxygen/Hygrothermal Aging of SiC/Epoxy Resin Composite as an Insulating Coating with Nonlinear Conductivity
The advancement of high-voltage power electronic devices had increased the demands placed on their insulating packages.To increase the insulation performance of the device,a type of insulation coating with nonlinear conductivity was proposed in this study,and the performance was analyzed.Firstly,the preparation process of the SiC/epoxy composite was studied,and the variation of electrical conductivity with electric field intensity and the temperature was analyzed.The device was prepared with the composite as an insulating coating around the edge of the copper metallization on the substrate.Through finite element electric field simulation,the electric field peak of the device with the insulating coating was found to be 38.6％lower than that of the device without the coating.The partial discharge test found that the partial discharge initiation voltage of encapsulated device using the insulating coating increased by 44.9％.Finally,the long-term reliability of composite was studied.Thermo-oxygen aging,hygrothermal aging and microscopic mechanism were analyzed.The final results show that the long-term insulation reliability of the power device encapsulated by the SiC/epoxy composite was better than that of the control group.
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