TiO<sub>2</sub>/环氧复合材料脉冲真空沿面闪络特性

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摘要为了揭示微米TiO₂填料对环氧复合材料真空快脉冲作用下的沿面闪络特性的影响, 并探讨相关影响因素的作用机理, 制备了6种不同填料含量的TiO₂/环氧复合材料, 测试了各种试样在30 ns(脉冲前沿)/200ns(半高宽)脉冲作用下的真空沿面闪络电压, 并测量了介电频谱和热刺激去极化电流(TSDC)。结果显示, TiO₂质量分数(wt%)的变化对TiO₂/环氧复合材料的闪络电压有显著影响, 但两者之间并不是线性关系;随着填料质量分数的增加, 复合材料的介电常数和电导率都逐渐增加;所有实验材料都存在深、浅两种不同的陷阱能级, 深陷阱电荷量和浅陷阱电荷量随填料质量分数的变化呈现出不同的变化规律。分析认为, TiO₂/环氧复合材料的真空快脉冲沿面闪络特性不能由介电常数和电导率等影响因素的变化趋势单独解释, 而针对闪络的深浅陷阱共同作用模型可以很好地解释闪络电压的实验结果。同时, 根据实验结果对闪络的深浅陷阱共同作用模型进行完善, 提出了当填料质量分数较低时, 浅陷阱将显著降低材料的闪络强度, 而当填料质量分数较高时, 深陷阱对闪络强度的增强作用更为明显。

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关键词 ： TiO, 环氧复合材料, 沿面闪络, 介电谱, 热刺激去极化电流, 深浅陷阱

Abstract：In this article, in order to study the effect of micro TiO₂ filler on the pulsed vacuum surface flashover characteristics of the epoxy composites and find out the work mechanism of some related factors, micro TiO₂ is loaded into epoxy. Six kinds of samples with different filler contents are prepared. Their vacuum surface flashover voltages under the 30ns(rise time)/200ns (half-height width time) single-pulse are measured, and their dielectric spectrum and thermally stimulated depolarization current(TSDC) are also carried out. Results show that the filler content has a visible effect on the flashover voltage of the TiO₂/epoxy composite material, but there is not linear relation between them. Moreover, the dielectric constant and electrical conductivity of the samples both increase with the increase of the filler content. It is also observed that there are both shallow and deep traps in all the samples, and the regularities of shallow trap and deep trap are different as the function of filler content. According to the experimental results, it is summarized that no one of the parameters studied in the paper is the only the factor that determines the pulsed vacuum surface flashover characteristics of the TiO₂/epoxy composites, and the surface flashover experiment results can be well explained with the model of shallow and deep traps for surface flashover. Furthermore, some improvement of the model is carried out. It is presented that the weakening effect of the shallow trap on the flashover strength is dominative when the filler content is small, whereas the enhancing effect of the deep trap

Key words： TiO epoxy composites surface flashover dielectric spectrum thermally stimulated depolarization current shallow and deep traps

收稿日期: 2009-10-14 出版日期: 2014-03-20

PACS:

TM85

基金资助:国家自然科学基金重点项目(50437030)和国家自然科学基金面上项目(10876024)资助。

作者简介: 王增彬男, 1983年生, 博士研究生, 研究方向为强陡脉冲作用下绝缘材料沿面闪络机理及其改性提高。成永红男, 1965年生, 博士, 教授, 研究方向为电力设备绝缘劣化机理、检测与诊断技术以及电介质材料介电性能。

引用本文:

王增彬成永红, 陈玉周稼斌卢为吴锴. TiO₂/环氧复合材料脉冲真空沿面闪络特性[J]. 电工技术学报, 2012, 27(5): 109-114. Wang Zengbin, Cheng Yonghong, Chen Yu, Zhou Jiabin, Lu Wei, Wu Kai. Study of Pulsed Vacuum Surface Flashover Characteristics of Epoxy Composites with TiO₂ Fillers. Transactions of China Electrotechnical Society, 2012, 27(5): 109-114.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I5/109

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