Effect of BaTiO3 nano-particles on breakdown performance of propylene carbonate.
Effect of BaTiO3 nano-particles on breakdown performance of propylene carbonate.
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DOI：
10.1063/1.4920997
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
Yanpan Hou;Zicheng Zhang;Jian-de Zhang;Zhuofeng Liu;Zuyin Song
中科院分区：
文献类型：
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作者：
Yanpan Hou;Zicheng Zhang;Jian-de Zhang;Zhuofeng Liu;Zuyin Song
碳酸丙烯酯（PC）作为水的替代物，其击穿强度高于水，电阻率大于10（9）Ω m，凝固温度低（-49 °C），在紧凑型脉冲功率源中具有良好的应用前景。在本文中，PC和PC基的纳米流体（NF）受到高幅值电场的介电击穿的研究与微秒脉冲施加到一个1 mm的间隙充满PC或NF之间的球形电极。一种NF由PC与0.5-1.4体积%的平均直径为100 nm的BaTiO 3（BT）纳米颗粒混合而成，另一种NF由PC与0.3-0.8体积%的平均直径为30 nm的BT纳米颗粒混合而成。实验结果表明，与PC相比，纳米纤维的介电常数和击穿强度的提高。此外，它被发现，存在一个最佳的分数，这些NF对应于巨大的表面积在纳米复合材料与有限的介观厚度。具体而言，当直径为100 nm的纳米颗粒的体积浓度为0.9%时，NF的介电击穿电压比PC高33%，当直径为30 nm的纳米颗粒的体积浓度为0.6%时，NF的击穿电压比PC高40%。这些现象被认为是因为基于PC的NF的介电击穿电压增加，因为纳米填料和PC基质之间的界面为电荷载流子提供了无数的陷阱位点，电荷载流子在NF的击穿性能中起主导作用。
As an alternative to water, propylene carbonate (PC) has a good application prospect in the compact pulsed power sources for its breakdown strength higher than that of water, resistivity bigger than 10(9) Ω m, and low freezing temperature (-49 °C). In this paper, the investigation into dielectric breakdown of PC and PC-based nano-fluids (NFs) subjected to high amplitude electric field is presented with microsecond pulses applied to a 1 mm gap full of PC or NFs between spherical electrodes. One kind of NF is composed of PC mixed with 0.5-1.4 vol. % BaTiO3 (BT) nano-particles of mean diameter ≈100 nm and another is mixed with 0.3-0.8 vol. % BT nano-particles of mean diameter ≈30 nm. The experimental results demonstrate the rise of permittivity and improvement of the breakdown strength of NFs compared with PC. Moreover, it is found that there exists an optimum fraction for these NFs corresponding to tremendous surface area in nano-composites with finite mesoscopic thickness. In concrete, the dielectric breakdown voltage of NFs is 33% higher than that of PC as the volume concentration of nano-particles with a 100 nm diameter is 0.9% and the breakdown voltage of NFs is 40% higher as the volume concentration of nano-particles with a 30 nm diameter is 0.6%. These phenomena are considered as the dielectric breakdown voltage of PC-based NFs is increased because the interfaces between nano-fillers and PC matrices provide myriad trap sites for charge carriers, which play a dominant role in the breakdown performance of NFs.