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改性BN-Si-B/环氧树脂复合材料的制备及绝缘性能

陈昊 黄紫微 赵伟 宋吉祥 周昱 林晓艺 翁凌

陈昊, 黄紫微, 赵伟, 等. 改性BN-Si-B/环氧树脂复合材料的制备及绝缘性能[J]. 复合材料学报, 2024, 41(5): 2477-2486. doi: 10.13801/j.cnki.fhclxb.20230825.005
引用本文: 陈昊, 黄紫微, 赵伟, 等. 改性BN-Si-B/环氧树脂复合材料的制备及绝缘性能[J]. 复合材料学报, 2024, 41(5): 2477-2486. doi: 10.13801/j.cnki.fhclxb.20230825.005
CHEN Hao, HUANG Ziwei, ZHAO Wei, et al. Preparation and insulating properties of modified BN-Si-B/epoxy resin composites[J]. Acta Materiae Compositae Sinica, 2024, 41(5): 2477-2486. doi: 10.13801/j.cnki.fhclxb.20230825.005
Citation: CHEN Hao, HUANG Ziwei, ZHAO Wei, et al. Preparation and insulating properties of modified BN-Si-B/epoxy resin composites[J]. Acta Materiae Compositae Sinica, 2024, 41(5): 2477-2486. doi: 10.13801/j.cnki.fhclxb.20230825.005

改性BN-Si-B/环氧树脂复合材料的制备及绝缘性能

doi: 10.13801/j.cnki.fhclxb.20230825.005
详细信息
    通讯作者:

    陈昊,博士,讲师,硕士生导师,研究方向为绝缘材料的研制、性能与应用 E-mail: chenhao1982@126.com

  • 中图分类号: TB332

Preparation and insulating properties of modified BN-Si-B/epoxy resin composites

  • 摘要: 电晕放电影响电气设备的稳定运行和使用寿命,提高绝缘材料的耐电晕性能对于保证电气设备的正常运行具有重要意义。本文利用硅烷偶联剂改性氮化硼(BN)制备改性BN (fBN),并将其与分散剂(有机硅硼复合氧化物(Si-B))共混对环氧树脂(EP)进行了改性。采用共混法和热固法制备了不同fBN含量的fBN-Si-B/EP复合材料,提高了环氧树脂的耐电晕寿命。实验结果表明:在30℃和30 kV·mm−1电场强度下,fBN-Si-B/EP复合材料的耐电晕寿命最高可达114.8 h,是纯环氧树脂5.01倍。随着fBN掺杂量的增加,fBN-Si-B/EP复合材料的介电常数呈现增加的趋势。同时,该复合材料的体积电阻率和击穿场强则表现出先降低后增加的趋势。少量fBN的加入可以降低复合材料的相对介电常数,抑制介电损耗增加。虽然fBN-Si-B/EP复合材料的击穿场强和体积电阻率略微降低,体积电阻率极小值为6.65×1014 Ω·cm,击穿场强极小值为24.04 kV·mm−1,但仍具有较好的绝缘性能。

     

  • 图  1  氮化硼(BN)和硅烷偶联剂改性氮化硼(fBN)的XRD图谱

    Figure  1.  XRD patterns of boron nitride (BN) and treating boron nitride with a silane coupling agent (fBN)

    图  2  Si-B合成(a)与KH-550改性BN示意图(b)

    Figure  2.  Schematic diagram of organosilicon boron composite oxide (Si-B) synthesis (a) and KH-550 modified BN (b)

    图  3  苯基三乙氧基硅烷、硼酸三丁酯和Si-B的傅里叶红外图谱

    Figure  3.  FTIR spectra of phenyltriethoxysilane, tributyl borate and Si-B

    图  4  BN和fBN的傅里叶红外图谱

    Figure  4.  FTIR spectra of BN and fBN

    图  5  0.1wt%BN-Si-B/EP (a)、1.0wt%BN-Si-B/EP (b)、0.1wt%fBN-Si-B/EP (c)、1.0wt%fBN-Si-B/EP (d)复合材料的断面SEM图像

    EP—Epoxy resin

    Figure  5.  SEM images of fracture surface of 0.1wt%BN-Si-B/EP (a), 1.0wt%BN-Si-B/EP (b), 0.1wt%fBN-Si-B/EP (c), 1.0wt%fBN-Si-B/EP (d) composites

    图  6  fBN-Si-B/EP复合材料的耐电晕寿命

    Figure  6.  Corona resistance life of fBN-Si-B/EP composites

    图  7  fBN-Si-B/EP复合材料的电晕击穿示意图

    Figure  7.  Schematic diagram of corona breakdown of fBN-Si-B/EP composites

    图  8  纯EP ((a), (b))、0.1wt%fBN-Si-B/EP (c)、1.0wt%fBN-Si-B/EP (d)复合材料电晕击穿点附近形貌

    Figure  8.  Morphologies near the corona breakdown point of pure EP ((a), (b)), 0.1wt%fBN-Si-B/EP (c), 1.0wt%fBN-Si-B/EP (d) composites

    图  9  fBN-Si-B/EP复合材料的体积电阻率

    Figure  9.  Volume resistivity of fBN-Si-B/EP composites

    图  10  fBN-Si-B/EP复合材料的介电常数

    Figure  10.  Dielectric constant of fBN-Si-B/EP composites

    图  11  fBN-Si-B/EP复合材料的介电损耗

    Figure  11.  Dielectric loss of fBN-Si-B/EP composites

    图  12  fBN-Si-B/EP复合材料的击穿场强威布尔分布

    P—Probability of composites breakdown

    Figure  12.  Weibull distribution of breakdown strength for fBN-Si-B/EP composites

    表  1  fBN-Si-B/EP复合材料的威布尔击穿强度(E0)和形状参数(β)

    Table  1.   Weibull breakdown strength (E0) and shape parameter (β) for fBN-Si-B/EP composites

    fBN content/wt%E0/(kV·mm−1)β
    0.035.3213.08
    0.126.2617.36
    0.326.12 9.19
    0.524.0412.94
    0.726.2818.15
    1.029.1517.34
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出版历程
  • 收稿日期:  2023-07-17
  • 修回日期:  2023-08-10
  • 录用日期:  2023-08-10
  • 网络出版日期:  2023-08-28
  • 刊出日期:  2024-05-01

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