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Volume 30 Issue 3
Mar.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(3): 548-558
Qiuying Li, Yiheng Lu,  and Zhuoyan Shao, Fabrication of a flexible microwave absorber sheet based on a composite filler with fly ash as the core filled silicone rubber, Int. J. Miner. Metall. Mater., 30(2023), No. 3, pp. 548-558. https://doi.org/10.1007/s12613-022-2517-1
Cite this article as:
Qiuying Li, Yiheng Lu,  and Zhuoyan Shao, Fabrication of a flexible microwave absorber sheet based on a composite filler with fly ash as the core filled silicone rubber, Int. J. Miner. Metall. Mater., 30(2023), No. 3, pp. 548-558. https://doi.org/10.1007/s12613-022-2517-1
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研究论文

粉煤灰/NiFe2O4核壳填料/硅橡胶吸波复合材料的制备与性能

  • 华东理工大学材料科学与工程学院, 上海 200237, 上海

  • 通讯作者:

    李秋影    E-mail: liqy@ecust.edu.cn

文章亮点

  • (1) 制备了粉煤灰/NiFe2O4核壳填料
  • (2) 为粉煤灰的回收再利用提供了新的思路
  • (3) 制备了粉煤灰/NiFe2O4填充的硅橡胶吸波复合材料
  • (4) 制备的硅橡胶吸波复合材料高频下吸波性能优良，热稳定性、耐环境和疏水性能优良
  • (5) 为高频吸波材料的制备提供了新的思路
  • 首先以粉煤灰(FA)，Fe(NO3)3∙9H2O和Ni(NO3)2∙6H2O为原料，采用改性的溶胶-凝胶方法，制备了以FA为核，以NiFe2O4为壳的核壳填料。然后，以硅橡胶为基体，采用FA/NiFe2O4核壳填料对其填充改性，制备了硅橡胶吸波复合材料。X射线衍射、红外光谱、X射线光电子能谱和扫描电子显微镜结果表明，NiFe2O4成功包覆在FA表面，且包覆均匀致密。核壳填料显著改善了硅橡胶的吸波性能， 17.5 GHz 下，材料的最小反射损耗值为−23.8 dB，有效吸收带宽高达12 GHz，原因为多重损耗机理，即界面极化损耗、磁损耗和多重反射损耗。与未填充的硅橡胶相比，硅橡胶吸波复合材料的热稳定性、柔韧性、耐环境性和疏水性均有所提高。本工作对粉煤灰的回收再利用和硅橡胶吸波复合材料的制备提供了新的思路。
    • Research Article

    Fabrication of a flexible microwave absorber sheet based on a composite filler with fly ash as the core filled silicone rubber

    + Author Affiliations
      Abstract
    • A new type of composite filler was designed by a modified sol–gel method using fly ash (FA), Fe(NO3)3∙9H2O, and Ni(NO3)2∙6H2O as raw materials. The composite filler was a spherical core–shell structure composed of FA as the core and NiFe2O4 as the shell. Further, the composite filler was added into the silicone rubber to fabricate the high temperature vulcanized microwave absorption materials; X-ray diffraction, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope confirmed that NiFe2O4 was successfully coated on the surface of FA and formed a uniform and continuous coating layer. As expected, silicone rubber filled with the composite filler had a minimum reflection loss of −23.8 dB at 17.5 GHz with the thickness of 1.8 mm, while the effective absorption bandwidth was as high as 12 GHz. The addition of the composite filler greatly enhanced the microwave absorption properties of the system, which was resulted from multiple losses mechanism: interface polarization losses, magnetic losses, and multiple reflection losses. Also, silicone rubber filled with the composite filler exhibited excellent thermal stability, flexibility, environmental resistance, and hydrophobicity compared with traditional silicone rubber. Therefore, this work not only responds to the green chemistry to achieve efficient FA recovery, but also devises a new strategy to prepare microwave absorption materials with strong potential for civilian applications.
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