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 SrTiO 3 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

由三篇文章组成的系列文章提出了一种创新的方法，该方法基于通过电泳定制的聚合物/陶瓷复合材料，从工艺原理到其在电力电子领域的分级应用，来构建先进的功能梯度材料（FGM）。在本部分的第1部分中，将介绍该过程，该过程依赖于在固化前在液态复合化合物上施加直流电压，以“冻结”积聚了颗粒的颗粒。为了说明这一原理，涉及环氧树脂和SrTiO的FGM复合材料 3呈现出具有介电常数梯度的高k粒子。进行了构建和表征它们的方法。在高压电极上观察到累积的颗粒区域，而耗尽的体积区域保持​​不变。随着场和/或时间的增加，该累积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。这项工作为开发更健壮的电子系统铺平了道路，该系统可以缓解关键区域的边缘电场。