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Preparation and properties of cobalt oxides coated carbon fibers as microwave-absorbing materials

机译：微波吸收材料包覆氧化钴碳纤维的制备及性能

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摘要

Cobalt oxides/carbon fibers (CoOx/CFs) composites were synthesized by thermal oxidation of cobalt coated carbon fibers (Co/CFs). The scanning electron microscopy images and X-ray diffraction pattern indicate that the layers are about 0.7μm and composed of Co_3O_4 and CoO (CoO_x), the preferred condition for preparation of CoO_x/CFs composites is to anneal Co/CFs precursors at 350℃ for 3h in air. The coercivity, saturation magnetization and residual magnetization of the CoO_x/CFs composites are 464.8 Oe, 10.62 emu/g and 2.21 emu/g, respectively. The reflectivity of cobalt oxides coated carbon fibers (1.11-5.12mm in thickness) is less than -10dB over the working frequency range of 4.04-18.00GHz and less than -20dB over 11.54-14.77GHz. The lowest reflectivity is -45.16dB at 13.41 GHz when the thickness is 1.50 mm.
机译：通过热氧化涂覆钴的碳纤维（Co / CFs）合成了氧化钴/碳纤维（CoOx / CFs）复合材料。扫描电镜图像和X射线衍射图表明，该层约0.7μm，由Co_3O_4和CoO（CoO_x）组成，制备CoO_x / CFs复合材料的优选条件是在350℃退火Co / CFs前驱体。空中3小时。 CoO_x / CFs复合材料的矫顽力，饱和磁化强度和残余磁化强度分别为464.8 Oe，10.62 emu / g和2.21 emu / g。在4.04-18.00GHz的工作频率范围内，涂有氧化钴的碳纤维（厚度为1.11-5.12mm）的反射率小于-10dB，而在11.54-14.77GHz的工作频率范围内小于-20dB。当厚度为1.50 mm时，最低反射率在13.41 GHz时为-45.16dB。

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  • 来源
    《Applied Surface Science》 |2011年第17期|p.7678-7683|共6页
  • 作者

    Ying Liu; Zhongquan Zhang; Songtao Xiao; Chengwen Qiang; Liangliang Tian; Jincheng Xu;

  • 作者单位

    Key Laboratory for the Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China,Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China;

    Key Laboratory for the Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China,Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China;

    Key Laboratory for the Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China,Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China;

    Key Laboratory for the Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China,Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China;

    Key Laboratory for the Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China,Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China;

    Key Laboratory for the Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China,Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    carbon fibers; cobalt oxides; thermal oxidation; magnetic properties; microwave absorbing materials;

    机译：碳纤维氧化钴热氧化磁性微波吸收材料;

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