方波脉冲下纳米氧化铝掺杂对聚酰亚胺介电性能的影响

发布时间：2017-12-26 20:43

本文关键词：方波脉冲下纳米氧化铝掺杂对聚酰亚胺介电性能的影响　出处：《高电压技术》2015年06期 　论文类型：期刊论文

【摘要】：为了研究方波条件下纳米Al2O3对PI膜介电性能的影响,将粒径为60 nm的Al2O3纳米粒子作为无机填料添加到PI基体中,制作了掺杂量质量分数为1%,2%,5%,7%,10%的PI薄膜。测量了PI/Al2O3薄膜耐电晕性能和介电温度谱以及介电频谱,并用SEM镜观察了放电前后PI/Al2O3薄膜微观形貌。研究结果表明:Al2O3纳米粒子的掺入提高了复合薄膜的耐电晕性能;PI/Al2O3复合薄膜的相对介电常数(εr)与介质损耗正切(tanδ)值随着Al2O3含量升高而升高,其tanδ值随着频率的增加先减小后增大,在200 Hz处有最小值。在同一频率下,PI/Al2O3薄膜εr和tanδ表现出对温度的依赖性,tanδ在70℃与170℃附近出现两个峰值;且随着Al2O3含量的增高,tanδ介电峰向高温方向移动。PI基体中高分子链缠结在纳米粒子周围,纳米粒子所引入的界面以及在聚合物中表现的"钉扎效应"是影响PI/Al2O3复合薄膜介电性能的主要原因。
[Abstract]:In order to study the effect of nano Al2O3 on the dielectric properties of PI films under the square wave condition, the Al2O3 nanoparticles with particle size of 60 nm were added into the PI matrix as inorganic filler, and the PI films doped with mass fraction of 1%, 2%, 5%, 7% and 10% were prepared. The corona resistance, dielectric temperature spectrum and dielectric spectrum of PI/Al2O3 films were measured, and the micromorphology of PI/Al2O3 films before and after the discharge was observed by SEM mirror. The results show that the incorporation of Al2O3 nanoparticles composite improves the corona resistance of the film; the relative dielectric constant of PI/Al2O3 composite film (R) and dielectric loss tangent (tan delta) value increased with the increase of Al2O3 content, the tan value with the increase of frequency decreases first and then increases, there is a minimum in 200 Hz. At the same frequency, the PI/Al2O3 film R and tan delta show a temperature dependence. Tan delta has two peaks near 70 and 170 Tan, and with the increase of Al2O3 content, the dielectric peak of tan delta moves towards high temperature. The polymer chains in the PI matrix are entangled around the nanoparticles. The interface introduced by nanoparticles and the pinning effect in polymer are the main reasons that affect the dielectric properties of PI/Al2O3 composite films.
【作者单位】：西南交通大学电气工程学院;
【基金】：国家自然科学基金(51177136;U1234202)~~
【分类号】：O633.22;TM22
【正文快照】： 0引言1随着电力电子技术的不断发展,脉宽调制(PWM)广泛应用于电机控制领域。变频调速牵引电机具有效率高、噪声低、可靠性好等优点[1-3],是高速铁路动车组的核心设备,其绝缘的安全性直接影——响到动车组运行安全[4]。机车运行时,变频电机中的变频器输出的一系列脉冲方波电压

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