高压绝缘纳米复合材料强电场下的力电行为研究

项目名称： 高压绝缘纳米复合材料强电场下的力电行为研究

项目编号： No.11302053

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 陈明继

作者单位： 国家纳米科学中心

项目金额： 30万元

中文摘要： 高性能绝缘材料的研发，是发展特高压直流输电技术的关键，而绝缘聚合物的空间电荷积聚和电老化则是制约其发展的主要瓶颈。最新实验表明，纳米复合材料是克服这一瓶颈的有效途径，然而，关于纳米颗粒对空间电荷和电老化抑制机理的研究则十分缺乏，严重制约了新材料的设计、制备与应用。因此，本项目将系统地研究高压绝缘纳米复合材料强电场下的力电行为。创新地提出将原子尺度模拟与空间电荷动力学计算相结合，建立纳米复合材料中空间电荷分布的计算模型；将电树枝生长判据嵌入有限元，开发高压绝缘纳米复合材料电树枝生长的三维数值模拟技术；建立考虑空间电荷和纳米颗粒双夹杂相复合材料中电老化驱动能的理论模型；发展高压绝缘纳米复合材料的微观力电耦合实验表征方法。通过研究，揭示纳米颗粒抑制空间电荷积聚和电老化的机理，建立材料性能表征参量及其评价体系，指导高压绝缘纳米复合材料的优化设计。

中文关键词： 纳米复合材料；空间电荷；击穿电场；电致失效；

英文摘要： Research and development of high-performance insulating materials are of great significance for developing ultrahigh-voltage DC transmission. However, space charge accumulation and electrical ageing have become bottleneck of this kind of materials. Although the recent experiments have demonstrated nanocomposite an effective approach to break this bottleneck, research on the mechanism for suppression of space charge and electrical ageing by addition of nanoparticles is still lack, which restricts the design, fabrication and application of new materials. Therefore, in this project, we will study systematically the mechanical and electrical behaviors of high-voltage insulating nanocomposites under strong electric field. An approach combining atomic scale simulation and space charge dynamics will be creatively proposed and a computational model for space charge distribution in nanocomposites will be established. By embedding the electrical tree growth criterion into finite element code, a three-dimensional numerical simulation technology for electrical tree growth in high-voltage insulating nanocomposites will be developed. A theoretical model for driving energy of electrical ageing will also be established by considering space charge and nanoparticle as two inclusion phases in the composites. Besides, an approach f

英文关键词： Nanocomposite；Space charge；Breakdown field；Electrically induced failure；