A series of three articles presents an innovative way to build advanced functionally graded materials (FGM) based on polymer/ceramic (epoxy/SrTiO3) composites tailored by electrophoresis for field grading in power electronics. In Part 3, this method is applied in the context of power modules for DBC substrate encapsulation. An evaluation of the FGM performances is reported based on electrostatic simulations and breakdown voltage measurements on encapsulated DBC substrates. The results show a significant mitigation of the electric fringe field at the triple point while breakdown is largely increased by a factor 2 for FGM composites compared to neat epoxy. The process enables the use of electric field reinforcements of HV electrical systems (e.g. tips coming from the design), and thus potential weak points, to locally `self-heal' them in-situ. Such an electrophoresis process used to build FGM composites paves the way for the next generation of functionalized polymer composites used in high voltage power applications for improving the electrical aging of insulating materials and power system reliability.

中文翻译：

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通过电泳定制的现场分级复合材料——图 3：在电力电子模块封装中的应用


系列三篇文章介绍了一种创新方法，用于构建基于聚合物/陶瓷（环氧树脂/SrTiO3）复合材料的先进功能梯度材料（FGM），该复合材料通过电泳定制，用于电力电子领域的现场分级。在第 3 部分中，该方法应用于 DBC 基板封装的电源模块。根据封装 DBC 基板上的静电模拟和击穿电压测量报告了 FGM 性能的评估。结果表明，与纯环氧树脂相比，FGM 复合材料的三相点电场边缘场显着减轻，而击穿大大增加了 2 倍。该过程使得能够使用高压电气系统的电场增强（例如来自设计的尖端）以及潜在的弱点，以在原位对其进行局部“自愈”。这种用于构建 FGM 复合材料的电泳工艺为用于高压电力应用的下一代功能化聚合物复合材料铺平了道路，以改善绝缘材料的电老化和电力系统的可靠性。