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首页> 外文学位 >High field nonlinear resistive silicon carbide, zinc oxide-based silicone rubber composites for cable field grading: Mechanism(s), properties and filler treatment .
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High field nonlinear resistive silicon carbide, zinc oxide-based silicone rubber composites for cable field grading: Mechanism(s), properties and filler treatment .

机译：用于电缆场分级的高场非线性电阻碳化硅，氧化锌基硅橡胶复合材料：机理，性能和填料处理。

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摘要

In this research, the underlying high field nonlinear I-V physics for typical nonlinear resistive field grading composites, which have potential application as high voltage cable field grading materials were rigorously investigated for the first time. The targeted composites were p-SiC/silicone rubber (SIR) composites, with filler size ranging from nano to sub-micron and micron scale.;The results suggest that a thermally- or phonon-assisted high field nonlinear hole nearest-neighbor hopping transport across inter-particle SIR layer hypothesis is likely the governing and common nonlinear mechanism for all the studied p-SiC/SIR field grading composites. Charge carriers (holes) in nano and sub-micron SiC/SIR composites may transfer across hop sites within the inter-particle SIR layer, both having an average hopping activation energy in the order of ∼0.4-0.5eV and average hopping distance of ∼5-10nm, whereas holes in more packed micro-SiC/SIR may hop directly between neighboring SiC-SiC particles, with a shallow hopping barrier of ∼0.1eV and potentially shorter hopping distance. As is predicted by the hopping-based transport mechanism, results indicate that the composite low field resistivity, rho0, and nonlinearity exponent, alpha, both decrease as temperature increases. As filler loading increases, the composite resistivity as well as the onset nonlinearity field Ec also decrease, yet at certain intermediate filler loading the composite may show a subtle maximum nonlinearity exponent, alpha.;In an effort to explore appropriate pre-treatment process to develop alternative ZnO-based fillers for field grading application, pure ZnO was modified via a novel inorganic unsaturated aqueous SnF2 treatment. The treated-ZnO/SIR composites possess nonlinear resistive properties comparable to nano Cu-doped ZnO/SIR and commercial micro-SiC/EPDM (ethylene propylene diene monomer) field grading composites.;Finally, in response to our ABB sponsor, fillers were screened for industrial high field grading applications. The 50nm & 150nm beta-SiC, nano Cu-doped ZnO as well as ZnO treated after 0.23M SnF2 27°C/4min or 38°C/1h were identified to be promising candidates.
机译：在这项研究中，首次对典型的非线性电阻场分级复合材料的潜在高场非线性I-V物理特性进行了严格的研究，这种复合材料作为高压电缆场分级材料具有潜在的应用前景。目标复合材料是p-SiC /硅橡胶（SIR）复合材料，填料尺寸范围从纳米到亚微米和微米级;;结果表明，热或声子辅助的高场非线性空穴最近邻跳跃传输跨粒子间SIR层的假设可能是所有研究的p-SiC / SIR场分级复合材料的主导和常见非线性机制。纳米和亚微米SiC / SIR复合材料中的载流子（空穴）可能会在粒子间SIR层内的跃点上转移，它们的平均跳跃激活能约为0.4-0.5eV，平均跳跃距离约为〜 5-10nm，而堆积更紧密的micro-SiC / SIR中的孔可能会直接跳到相邻的SiC-SiC颗粒之间，跳变势垒约为0.1eV，跳变距离可能更短。正如基于跳跃的传输机制所预测的那样，结果表明，复合低场电阻率rho0和非线性指数α都随温度升高而降低。随着填料载荷的增加，复合材料的电阻率以及起始非线性场Ec也会降低，但是在某些中等填料载荷下，复合材料可能会表现出细微的最大非线性指数α。作为用于现场分级的替代ZnO基填料，纯ZnO通过新型无机不饱和SnF2水溶液改性。经过处理的ZnO / SIR复合材料具有与纳米Cu掺杂的ZnO / SIR和商用微SiC / EPDM（乙烯丙烯二烯单体）现场分级复合材料相当的非线性电阻性能；最后，根据我们的ABB赞助商，对填料进行了筛选适用于工业高场分级应用。 50nm和150nm的β-SiC，纳米Cu掺杂的ZnO以及0.23M SnF2在27°C / 4min或38°C / 1h后处理的ZnO被认为是有前途的候选物。

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  • 作者

    Wang, Xiaoping.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Engineering Electronics and Electrical.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 123 p.
  • 总页数 123
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:24

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