Space Charge Formation in LDPE/MgO Nano-composite Thin Film under Ultra-high DC Electric Stress

Space Charge Formation in LDPE/MgO Nano-composite Thin Film under Ultra-high DC Electric Stress
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DOI：
10.1541/ieejfms.126.1084
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发表时间：
2006-06
期刊：
2006 IEEE 8th International Conference on Properties & applications of Dielectric Materials
影响因子：
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通讯作者：
Y. Hayase;H. Aoyama;Y. Tanaka;T. Takada;Y. Murata
Y. Hayase;H. Aoyama;Y. Tanaka;T. Takada;Y. Murata
中科院分区：
其他
文献类型：
--
作者：
Y. Hayase;H. Aoyama;Y. Tanaka;T. Takada;Y. Murata

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纳米复合技术的出现，使得在高直流应力下提高材料的电阻率、击穿强度等介电性能成为可能。然而，MgO纳米复合LDPE（LDPE/MgO）的改性机理尚不清楚。我们试图澄清的机制，改善的电性能集中在空间电荷的形成。为了研究MgO纳米填料对空间电荷分布的影响，我们在50至250 kV/mm的直流电场下使用PEA系统测量了空间电荷分布。在没有纳米填料的LDPE的情况下，在大于150 kV/mm的电压下测量到峰值电荷密度大于几百C/m3的正的类包电荷注入。MgO含量为0.2份的LDPE/MgO复合材料，在200 kV/mm以上的直流电场作用下，出现了包裹状电荷的振荡行为，而MgO含量为0.5份以上的LDPE/MgO复合材料则没有明显的电荷注入现象。据认为，通过向LDPE中添加仅大于0.5phr的MgO，空间电荷行为急剧改变。当复合材料中的纳米粒子含量大于0.5份时，复合材料具有良好的防止空间电荷注入的上级性能
Nano-composite technology makes it possible to improve dielectric properties, such as resistivity, breakdown strength and so on, under high DC stress. However, the mechanism of the improvement in MgO nano-composite LDPE (LDPE/MgO) has not been clear, yet. We attempted to clarify the mechanism of the improvement on the electrical properties focused on the space charge formation. To investigate the influence of MgO nano-filler on space charge profiles, we measured the space charge distributions using PEA system under DC electric field of 50 to 250 kV/mm. In the case of LDPE without nano-filler, a positive packet-like charge injection with peak charge density of more than several hundred C/m3 were measured under more than 150 kV/mm. In the case of LDPE/MgO with MgO content of 0.2 phr, an oscillating behavior of packet-like charge was observed when the DC electric field of more than 200 kV/mm was applied to it. On the other hand, in the case of LDPE/MgO with MgO content of more than 0.5 phr, there is no remarkable charge injection. It is thought that space charge behavior is drastically changed by adding only more than 0.5 phr of MgO to LDPE. The nano-composite including more than 0.5 phr shows a superior property to prevent the injection of space charge into bulk