Multicomponent epoxy micro/nano‐composites containing micro‐alumina, micro‐quartz, and nano‐silica were fabricated to develop electrical insulation materials with high thermal conductivity. Simply changing the ratio between the alumina and quartz microparticles caused a trade‐off relationship between the thermal conductivity and electrical insulation. Increasing the alumina content in the epoxy‐alumina/quartz micro‐composites enhanced the thermal conductivity but deteriorated the dielectric strength. An increase in the thermal conductivity without incurring a loss in the dielectric strength was achieved by incorporating silica nanoparticles in the epoxy micro‐composites. Adding silica nanoparticles to the epoxy micro‐composites was found to be more efficient in improving the thermal conductivity compared to increasing the alumina ratio, especially at low alumina/quartz ratios. This behavior corresponded to theoretical models. Therefore, we provide a useful insight, both practical and theoretical, into the more advanced optimization of designing multicomponent epoxy composites for electrical insulation with high thermal conductivity.

中文翻译：

---

二氧化硅纳米颗粒在多组分环氧复合材料中的作用，以实现高导热率的电绝缘

制备了包含微氧化铝，微石英和纳米二氧化硅的多组分环氧微/纳米复合材料，以开发具有高导热性的电绝缘材料。只需改变氧化铝和石英微粒之间的比例，就可以在热导率和电绝缘之间权衡取舍。环氧-氧化铝/石英微复合物中氧化铝含量的增加提高了热导率，但降低了介电强度。通过在环氧微复合物中掺入二氧化硅纳米粒子，可以在不降低介电强度的情况下提高热导率。发现将二氧化硅纳米颗粒添加到环氧微复合物中比提高氧化铝比例更有效地提高了导热率，特别是在低氧化铝/石英比的情况下。此行为与理论模型相对应。因此，我们为设计用于高导热率电绝缘的多组分环氧复合材料的更高级优化提供了实用和理论上的有用见识。