Abstract This paper presents the influence of Aluminum Nitride (AlN) nanoparticles on the electrical and material properties of epoxy resin (EP). The EP/AlN nanocomposites with different concentrations of nano-AlN fillers are prepared. The dispersion of the nano-AlN particles in the composites is analyzed by a field emission scanning electron microscope (FESEM). The electrical properties are investigated by the space charge and DC conductivity measurements, whereas the material properties are studied by Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. The results show that the homo-charge accumulation appears near both electrodes during the polarization, but there are limited negative charges left near both electrodes in the depolarization for the pure EP sample. There is no space charge accumulation in the 1 wt% and 2 wt% EP/AlN nanocomposites. The electric field distortion of the pure EP sample is 20%. Moreover, the electric field distortion initially decreases with the increase of the nano-AlN content, but it increases for the 2 wt% nano-AlN sample. Temperature has a dominant influence on the DC conductivity of the EP/AlN nanocomposites comparing to the pure EP. However, the DC conductivity of the nanocomposites becomes stable at high temperatures. It is also found that the weight loss of the samples decreases with the addition of the nano-AlN and the 1 wt% nano-AlN sample has the highest glass transition temperature. It is elucidated that the high apparent mobility and activation energy facilitate the space charge transport and suppressing the space charge accumulation. Furthermore, the nano-AlN filler can increase the trap level and trap energy density of the deep traps in the sample. The dielectric loss of the EP at high frequency is reduced with the content of 1 wt% nano-AlN. Furthermore, the addition of the nano-AlN can improve the thermal stability of the EP. The 1 wt% nano-AlN sample has the superior electrical insulation and material performance amongst the tested materials.

中文翻译：

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封装材料用环氧树脂/氮化铝纳米复合材料的电学和材料性能改进

摘要 本文介绍了氮化铝 (AlN) 纳米粒子对环氧树脂 (EP) 电学和材料性能的影响。制备了具有不同浓度纳米AlN填料的EP/AlN纳米复合材料。通过场发射扫描电子显微镜 (FESEM) 分析纳米 AlN 颗粒在复合材料中的分散情况。通过空间电荷和直流电导率测量研究电性能，而分别通过傅里叶变换红外 (FT-IR)、热重分析 (TGA) 和差示扫描量热法 (DSC) 研究材料性能。结果表明，在极化过程中，在两个电极附近都出现了同质电荷积累，但对于纯 EP 样品，在去极化过程中，两个电极附近留下的负电荷有限。在 1 wt% 和 2 wt% EP/AlN 纳米复合材料中没有空间电荷积累。纯EP样品的电场畸变为20%。此外，电场畸变最初随着纳米 AlN 含量的增加而降低，但随着纳米 AlN 含量为 2 wt% 的样品而增加。与纯 EP 相比，温度对 EP/AlN 纳米复合材料的直流电导率有主要影响。然而，纳米复合材料的直流电导率在高温下变得稳定。还发现样品的重量损失随着纳米AlN的加入而降低，并且1wt%的纳米AlN样品具有最高的玻璃化转变温度。阐明了高表观迁移率和活化能促进了空间电荷传输并抑制了空间电荷积累。此外，纳米AlN填料可以提高样品中深陷阱的陷阱能级和陷阱能量密度。EP 在高频下的介电损耗随着 1 wt% nano-AlN 的含量而降低。此外，纳米AlN的加入可以提高EP的热稳定性。在测试材料中，1 wt% 的纳米 AlN 样品具有优异的电绝缘性和材料性能。