Thermally conducting composites for power electronics

H. S. Aliyev, S. Namazov, M. M. Guliyev, R. S. Ismayilova
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Abstract

The thermal conductivity of polyvinylchloride (PVC) containing graphite (Gr) micro fillers have been studied because of their potential applications in power electronics devices, batteries, electromagnetic shielding, antistatic and corrosion resistant coatings and other functional applications. Micro - composites containing (2, 4, 6, 8, 10, and 12%) volume fractions of graphite were fabricated. The thermal conductivity (K) of composites is enhanced by ~420% as concentration is increased from 0 to 12vol. %. Composites with a higher concentration show a stronger dependence in the thermal conductivity. It was revealed that, upon heating and cooling of these heterogeneous macro systems, hysteresis phenomena based on the effect of the “asymmetry” of the temperature evolution of the electrically active defects appear at the temperatures T<80°C. During the heating -cooling cycle, the relative changes in the ε′ and tanδ with the temperature were about 33 and 61%, respectively.
电力电子用导热复合材料
由于含有石墨(Gr)的聚氯乙烯(PVC)微填料在电力电子器件、电池、电磁屏蔽、抗静电和耐腐蚀涂层以及其他功能应用中的潜在应用,人们对其导热性进行了研究。制备了含有(2、4、6、8、10和12%)体积分数石墨的微复合材料。当浓度从0增加到12vol时,复合材料的导热系数(K)提高了约420%。%。浓度越高,复合材料的导热系数依赖性越强。结果表明,在对这些非均相宏观体系进行加热和冷却后,在T<80℃时出现了基于电活性缺陷温度演化“不对称”效应的滞后现象。在加热-冷却循环过程中,ε′和tanδ随温度的相对变化分别为33%和61%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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