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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Contribution of nano-SiC/epoxy coating with nonlinear conduction characteristics to surface charge accumulation under DC voltage
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Contribution of nano-SiC/epoxy coating with nonlinear conduction characteristics to surface charge accumulation under DC voltage

机译：纳米/环氧涂层在直流电压下具有非线性传导特性的纳米/环氧涂层的贡献

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摘要

In order to suppress surface charge accumulation, a nano-SiC/epoxy composite with nonlinear conduction characteristic was employed to coat a pure epoxy substrate in this paper. Surface potential distributions on the insulator were measured after being charged by a pair of finger-shaped electrodes (one was powered at -10 kV, and the other was grounded). For the insulators with and without coating, there were mainly positive potentials on the whole surface, and the area with higher potential located near the high voltage electrode. As the charging time increased, the high potential area began to shrink, indicating a possible charge migration. When the charging time exceeded 60 min, the potential distribution was almost kept unchanged. Compared with the pure epoxy substrate, the amount of surface charges had a slight increment after being coated with 3 wt% nano-particles. The accumulated surface charges were progressively reduced when the content of fillers became higher. Especially for the samples with 7 wt% and 10 wt% ingredients, there was a sharp decrease of accumulated surface charges in the distributed area and magnitude from 40 to 60 min. In terms of surface trapping characteristics and nonlinear conduction of the composite, the effect of coating on the surface charge accumulation was discussed.
机译：为了抑制表面电荷累积，采用具有非线性传导特性的纳米SiC /环氧复合材料在本文中涂覆纯环氧基质。在由一对指状电极充电后测量绝缘体上的表面电位分布（一个是-10kV，另一个接地）。对于具有且不涂层的绝缘体，整个表面上主要存在正电位，并且具有较高潜在位于高压电极的区域。随着充电时间增加，高潜在区域开始缩小，表示可能的电荷迁移。当充电时间超过60分钟时，电位分布几乎保持不变。与纯环氧基质相比，在涂覆有3wt％纳米颗粒后，表面电荷的量略有增量。当填料的含量更高时，累积的表面电荷逐渐减小。特别是对于具有7wt％和10wt％成分的样品，分布区域中累积的表面电荷的急剧下降，幅度为40至60分钟。就复合材料的表面捕获特性和非线性传导而言，讨论了涂层对表面电荷累积的影响。

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