The effects of nano‐aluminum nitride (nano‐AlN) on the thermal conductivity and dielectric performances of epoxy resin (EP) are investigated. The addition of nanoparticles in the materials is characterized. The trap characteristics of the samples are estimated using the surface potential decay (SPD) measurements at high temperatures. The results show that the nano‐AlN fillers are well dispersed in the nano‐AlN composites. The thermal conductivity consistently increases with an increase of the nano‐AlN content. The DC breakdown strength of the EP is enhanced with the addition of the nanoparticles as well, especially for the 0.5 and 1 wt% EP/AlN composites. The DC conductivity of the EP/AlN composites increases more obviously at the high temperature. The initial surface charge density of the samples with the same content of nano‐filler decreases with the increase of the temperature. Both the addition of nanoparticles and high temperature can improve the apparent carrier mobility of the EP sample. The trap density and trap level of the deep traps decreases with the increase of the temperature. It is postulated that shallow traps influence the voltage decay in the EP samples and increase the activation energy and the apparent carrier mobility of the specimens at the high temperature.

中文翻译：

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高温下环氧树脂/氮化铝纳米复合材料的增强的热和介电性能

研究了纳米氮化铝（nano-AlN）对环氧树脂（EP）的导热性和介电性能的影响。表征了材料中纳米颗粒的添加。使用高温下的表面电势衰减（SPD）测量来估计样品的陷阱特性。结果表明，纳米AlN填料很好地分散在纳米AlN复合材料中。导热系数随着纳米AlN含量的增加而持续增加。EP的DC击穿强度也随着纳米颗粒的添加而增强，特别是对于0.5和1wt％的EP / AlN复合材料。EP / AlN复合材料的直流电导率在高温下更加明显。纳米填料含量相同的样品的初始表面电荷密度随温度的升高而降低。纳米颗粒的添加和高温均可以改善EP样品的表观载流子迁移率。深陷阱的陷阱密度和陷阱水平随温度的升高而降低。据推测，浅陷阱会影响EP样品中的电压衰减，并增加高温下样品的活化能和表观载流子迁移率。