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首页> 外文期刊>Polymer Composites >Enhanced thermal and dielectric performance of epoxy resin/aluminum nitride nanocomposites at high temperatures
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Enhanced thermal and dielectric performance of epoxy resin/aluminum nitride nanocomposites at high temperatures

机译：在高温下增强环氧树脂/氮化铝纳米型复合材料的热和介电性能

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摘要

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.
机译：研究了纳米氮化铝（nano-AlN）对环氧树脂（EP）导热性能和介电性能的影响。对在材料中添加纳米颗粒进行了表征。利用高温下的表面电位衰减（SPD）测量估计样品的陷阱特性。结果表明，纳米AlN填料在纳米AlN复合材料中分布良好。随着纳米AlN含量的增加，导热系数不断增加。纳米颗粒的加入也提高了EP的直流击穿强度，尤其是对于0.5和1 wt%EP/AlN复合材料。EP/AlN复合材料的直流电导率在高温下增加更为明显。相同纳米填料含量的样品的初始表面电荷密度随温度的升高而降低。纳米颗粒的加入和高温都可以提高EP样品的表观载流子迁移率。深陷阱的陷阱密度和陷阱能级随温度的升高而降低。假设浅陷阱会影响EP样品中的电压衰减，并增加样品在高温下的活化能和表观载流子迁移率。

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