微秒脉冲电场强度对BNNSs取向程度和环氧树脂复合材料热导率的影响

doi:10.19595/j.cnki.1000-6753.tces.200927

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摘要脉冲电场可以诱导绝缘高导热填料在基体中取向排列,使其在热流方向上形成高效热传导网络,可以有效地提高复合材料的热导率,但电场强度的影响规律尚不清晰。因此,该文使用微秒脉冲电场诱导氮化硼纳米片（BNNSs）取向排列,研究不同脉冲电场强度对BNNSs取向程度及复合材料热导率的影响,同时基于固化过程中BNNSs的受力情况,分析电场强度对填料取向程度和复合材料热导率的影响机理。结果表明,BNNSs的取向度和复合材料的热导率均随电场强度的增加而增加,在12kV/mm的高电场强度作用下,BNNSs平均取向角达到75.56°,复合材料的热导率提高到纯环氧树脂的2.6倍。但电场强度对两者的影响规律并不完全一致,在较高电场强度下,BNNSs的取向程度趋于饱和,而复合材料热导率的增加没有出现饱和现象。该研究是对微秒脉冲电场诱导填料取向以提高复合材料热导率的初步研究,可以为低填充量下制备具有高热导率的复合材料提供指导。

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	米彦
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	戴锦炎

关键词 ：微秒脉冲电场, 取向, BNNSs, 环氧树脂, 热导率

Abstract：The pulsed electric field can induce the orientation and arrangement of the insulating and high thermal conductivity filler in the matrix, so that it forms an efficient heat conduction network in the direction of heat flow, which can improve the thermal conductivity of the composite material effectively. However, the influence rule of electric field strength is not clear. Therefore, this paper used the microsecond pulsed electric field to induce the orientation arrangement of boron nitride nanosheets (BNNSs), and investigated the effects of different pulsed electric field strengths on the BNNSs orientation degree and the thermal conductivity of composite materials. Additionally, the corresponding mechanism of the electric field strength on the BNNSs orientation degree and the thermal conductivity of the composites was analyzed based on the forces experienced by the BNNSs during curing. The results show that under the strength of 12kV/mm, the average orientation angle of BNNSs reaches 75.56°, and the thermal conductivity of the composite material is increased to 2.6 times that of pure epoxy resin. Both the BNNSs orientation degree and the thermal conductivity of composite materials increase with the increase of electric field strength, but the influence is not completely consistent. Under higher strength, the orientation of fillers tends to be saturated, but the increase in the thermal conductivity does not appear to be saturated. In general, this study is a preliminary exploration of microsecond pulse-induced filler orientation to improve the thermal conductivity of composites, and can provide guidance for the preparation of high thermal conductivity composites at low loadings.

Key words： Microsecond pulsed electric field orientation boron nitride nanosheets epoxy resin thermal conductivity

收稿日期: 2020-07-29

PACS:

TM836

基金资助:先进输电技术国家重点实验室开放基金资助项目（GEIRI-SKL-2017-006）

通讯作者: 米彦男,1978年生,教授,博士生导师,研究方向为高电压与绝缘技术。E-mail: miyan@cqu.edu.cn

作者简介: 葛欣女,1995年生,硕士研究生,研究方向为高电压与绝缘技术。E-mail: 20181102038t@cqu.edu.cn

引用本文:

米彦, 葛欣, 刘露露, 苟家喜, 戴锦炎. 微秒脉冲电场强度对BNNSs取向程度和环氧树脂复合材料热导率的影响[J]. 电工技术学报, 2022, 37(6): 1533-1541. Mi Yan, Ge Xin, Liu Lulu, Gou Jiaxi, Dai Jinyan. Effect of Microsecond Pulsed Electric Field Strength on the BNNSs Orientation Degree and the Thermal Conductivity of Epoxy Resin Composites. Transactions of China Electrotechnical Society, 2022, 37(6): 1533-1541.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.200927 https://dgjsxb.ces-transaction.com/CN/Y2022/V37/I6/1533

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