A series of three articles present an innovative way to build advanced functionally graded materials (FGM) based on polymer/ceramic composites tailored by electrophoresis from the process principle to their field grading application in power electronics. In this Part 1, the process is presented and relies on applying a DC voltage on liquid composite compound before curing in order to `freeze' the particles where they have been accumulated. To exemplify this principle, FGM composites involving an epoxy resin with SrTiO3 high-k particles with a permittivity gradient are presented. The methodology to build and characterize them is carried out. An accumulated particle region is observed at the high voltage electrode while the depleted bulk region remains unmodified. This accumulated particle layer both increases in thickness and in filler densification with increasing the field and/or time allowing tuning its permittivity. This work paves the way to the development of more robust electronic systems where the electrical fringe field in critical regions can be mitigated.

中文翻译：

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电泳定制的场分级复合材料第1部分：均匀电场中的原理和介电常数梯度


系列三篇文章介绍了一种创新方法，用于构建基于通过电泳定制的聚合物/陶瓷复合材料的先进功能梯度材料 (FGM)，从工艺原理到电力电子领域的梯度应用。在第 1 部分中，介绍了该过程，该过程依赖于在固化之前在液体复合化合物上施加直流电压，以便“冻结”颗粒聚集的地方。为了举例说明这一原理，我们提出了包含环氧树脂和具有介电常数梯度的 SrTiO3 高 k 颗粒的 FGM 复合材料。实施了构建和表征它们的方法。在高压电极处观察到累积的颗粒区域，而耗尽的本体区域保持不变。随着场和/或时间的增加，这种积累的颗粒层的厚度和填料致密化都增加，从而允许调节其介电常数。这项工作为开发更强大的电子系统铺平了道路，可以减轻关键区域的电边缘场。