填充纳米粒子提高硅橡胶耐电弧性的作用机理

发布时间：2018-01-07 10:37

本文关键词：填充纳米粒子提高硅橡胶耐电弧性的作用机理　出处：《高电压技术》2017年11期 　论文类型：期刊论文

【摘要】：在硅橡胶基体中填充一定质量分数的纳米粒子是提高硅橡胶材料耐电弧性的重要方法。为此,针对填充纳米粒子提高硅橡胶耐电弧性的作用机理展开了研究,通过填充不同质量分数的氢氧化铝(ATH)和氮化硼(BN)纳米粒子,制备了不同耐电弧性的硅橡胶试样,结合扫描电子显微镜、击穿电场强度、热失重分析和导热系数等实验结果,分析讨论了填充纳米粒子提高硅橡胶耐电弧性的作用机理。结果表明:填充ATH可提高试样的耐电弧性,当ATH填充质量分数约为75%时试样的耐电弧性最优;只填充BN无法提高试样的耐电弧性;同时填充少量的BN和ATH可显著提高试样的耐电弧性,但其中BN填充质量分数最大应在25%~50%之间。分析认为,所填充的纳米粒子是从提高硅橡胶的导热性和热稳定性、自身分解吸热以及避免碳元素残留这4个方面同时作用,提高了硅橡胶材料的耐电弧性。
[Abstract]:It is an important method to improve the arc resistance of silicone rubber materials by filling nano-particles with certain mass fraction in the matrix of silicone rubber. Therefore, the mechanism of improving arc resistance of silicone rubber by filling nano-particles is studied. Silicon rubber samples with different arcing resistance were prepared by filling different mass fraction aluminum hydroxide (ATH) and boron nitride (BN) nanoparticles. Combined with scanning electron microscope (SEM), the electric field strength was broken down. The experimental results such as thermogravimetric analysis and thermal conductivity were used to analyze and discuss the mechanism of improving the arc resistance of silicone rubber by filling nano-particles. The results showed that filling ATH could improve the arc resistance of the samples. When the mass fraction of ATH is about 75, the arc resistance of the sample is optimal. Only filling BN can not improve the arc resistance of the sample. A small amount of BN and ATH at the same time can significantly improve the arc resistance of the sample, but the maximum mass fraction of BN filling should be between 25% and 50%. The filled nanoparticles can improve the thermal conductivity and thermal stability of silicone rubber, self-decomposition and endothermy, and avoid carbon residue, thus improving the arc resistance of silicone rubber materials.
【作者单位】：国网江西省电力公司电力科学研究院;清华大学电机工程与应用电子技术系;西安交通大学电力设备电气绝缘国家重点实验室;
【基金】：国家电网公司科技项目(编号略)~~
【分类号】：TM215.2
【正文快照】： 3.西安交通大学电力设备电气绝缘国家重点实验室,西安710049)0引言1硅橡胶材料具有独特的憎水性和憎水迁移性以及憎水性恢复特性[1-2],可以有效抑制表面泄漏电流,非常适宜在户外使用,尤其是在重污秽地区使用[3]。目前,全国现役硅橡胶复合绝缘子数量已超过400万支,在500 k V及

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