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<p>Sinceinverter-fed motor components are always in a harsh environment of strong electric field, they place higher requirements on the corona aging resistance and dielectric properties of inverter-fed motor insulation materials. In this paper, Si–B–Zr nanocomposite oxides were prepared by hydrolysis-condensation method using phenyltriethoxysilane, tributyl borate and zirconium <i>n</i>-propoxide as raw materials. Then, the Si-B-Zr/EP composites were prepared by in situ polymerization, mechanical stirring and thermal curing according to different gradient concentrations, in order to improve the corona resistance of the composite while maintaining good dielectric properties. The experimental results showed that the corona resistance life of Si–B–Zr/EP composites with different doping contents is higher than that of pure epoxy resin. 11 wt% Si–B–Zr/EP composite at 80&#xa0;°C and 50 kV·mm<sup>−1</sup>, the power frequency and high frequency corona resistance life can reach 31.92 h and 21.04 h, respectively, which is 20.02 times and 263 times that of pure epoxy resin. When the doping level exceeds 5 wt%, the dielectric constant and dielectric loss of Si-B-Zr/EP composites decrease and the breakdown field strength reaches a maximum. In addition, the volume resistivity of 3 wt% Si–B–Zr/EP composite is up to 2 orders of magnitude higher than that of pure epoxy resin, which indicates that the composite has good insulating properties.</p> Graphical abstract <p></p>

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Effect of nanoscale Si–B–Zr-modified epoxy composites on corona resistance properties

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Wei Zhao,
  • Jing Zhang,
  • Hao Chen,
  • Boxuan Wang,
  • Mingyue Jiang,
  • Shuang Yin,
  • Xiangyu Shi,
  • Ling Weng,
  • Zijian Wu,
  • Xiaorui Zhang,
  • Yunbo Shi,
  • Xincheng Deng

摘要

Sinceinverter-fed motor components are always in a harsh environment of strong electric field, they place higher requirements on the corona aging resistance and dielectric properties of inverter-fed motor insulation materials. In this paper, Si–B–Zr nanocomposite oxides were prepared by hydrolysis-condensation method using phenyltriethoxysilane, tributyl borate and zirconium n-propoxide as raw materials. Then, the Si-B-Zr/EP composites were prepared by in situ polymerization, mechanical stirring and thermal curing according to different gradient concentrations, in order to improve the corona resistance of the composite while maintaining good dielectric properties. The experimental results showed that the corona resistance life of Si–B–Zr/EP composites with different doping contents is higher than that of pure epoxy resin. 11 wt% Si–B–Zr/EP composite at 80 °C and 50 kV·mm−1, the power frequency and high frequency corona resistance life can reach 31.92 h and 21.04 h, respectively, which is 20.02 times and 263 times that of pure epoxy resin. When the doping level exceeds 5 wt%, the dielectric constant and dielectric loss of Si-B-Zr/EP composites decrease and the breakdown field strength reaches a maximum. In addition, the volume resistivity of 3 wt% Si–B–Zr/EP composite is up to 2 orders of magnitude higher than that of pure epoxy resin, which indicates that the composite has good insulating properties.

Graphical abstract