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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Accelerated aging of fast thermal cycle effects on the behavior of space charge in polyimide
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Accelerated aging of fast thermal cycle effects on the behavior of space charge in polyimide

机译：快速热循环的加速老化对聚酰亚胺中空间电荷行为的影响

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The spacecraft often interacts with plasma, high energy particles and magnetic fields on orbit. It causes the charge injected in the insulation materials and forms a high electric field. The discharge phenomenon will happen when the internal electric field reaches the discharge voltage threshold. The insulation material is a key component of electrical equipment on the spacecraft, its electrical properties affects the reliability and lifetime of the whole spacecraft. The insulation material on spacecraft withstands fast thermal cycle during operation on orbit, which causes internal thermal stress in it. The accumulation of internal thermal stress changes the material molecular structure and depolarization characteristics, thus affecting the behavior of the space charge inside the insulation material. In this paper, the temperature environment was achieved by contact heating plant and liquid nitrogen immersion to do accelerated aging test based on the temperature of operating spacecraft. By the mean of this method, 0, 50, 100, 150 and 200 times of the fast thermal cycle was carried out. The molecular structure characteristics, the thermally stimulated current characteristics and the space charge characteristics of the samples with different cycling times were studied through the methods including XPS, XRD, TSC and PEA. The results show that with the increase of fast thermal cycling times, the relative content of the C-N and C=O bonds increase and it also increases the shallow energy level charges. The charges are more easily to move inside the sample. Fast thermal cycle also increases the degree of crystallinity, thus the interface between crystalline region and amorphous region expands. It also increases the charge of deep energy level, which increased the amount of space charge injected in the sample.
机译：航天器通常与等离子体，高能粒子和轨道上的磁场相互作用。它导致电荷注入绝缘材料中并形成高电场。当内部电场达到放电电压阈值时，将发生放电现象。绝缘材料是航天器上电气设备的关键组成部分，其电气性能会影响整个航天器的可靠性和寿命。航天器上的绝缘材料在轨道运行期间承受快速的热循环，这会在其中造成内部热应力。内部热应力的积累会改变材料的分子结构和去极化特性，从而影响绝缘材料内部空间电荷的行为。本文通过接触式加热装置和液氮浸入实现温度环境，并根据航天器的工作温度进行加速老化试验。通过这种方法，进行了快速热循环的0、50、100、150和200倍。通过XPS，XRD，TSC和PEA等方法研究了不同循环时间样品的分子结构特征，热激电流特征和空间电荷特征。结果表明，随着快速热循环时间的增加，C-N键和C = O键的相对含量增加，并且还增加了浅能级电荷。电荷更容易在样品内部移动。快速的热循环也增加了结晶度，因此结晶区域和非晶区域之间的界面扩大了。它还会增加深能级的电荷，从而增加了注入样品中的空间电荷量。

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