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Potential of short Si–Ti–C–O fiber-reinforced epoxy matrix composite as electromagnetic wave absorbing material

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Abstract

The effects of fiber electrical properties on electromagnetic wave absorbing potential in short Si–Ti–C–O fiber-dispersed epoxy matrix composites were studied. Six kinds of short Si–Ti–C–O fibers with different respective electrical resistivity were incorporated into an epoxy matrix and the dielectric properties of the composites in a frequency range from 1 MHz to 1 GHz were measured. The penetration depth of electromagnetic wave, which is defined as the distance to reduce 1/e of the incident electromagnetic wave power, is obtained from the measured dielectric properties. It is found that the dielectric properties of the composites are strongly dependent on the electrical resistivity of the fiber: the use of lower electrical resistivity fiber leads to a shorter penetration depth. Independent of the electrical resistivity of fiber, the penetration depth decreases with increase in the frequency. This result demonstrates the potential of the composite as a thin electromagnetic wave absorbing material.

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Notes

  1. In the present composite, the fiber is distributed quasi two-dimensionally in-plane random-oriented and therefore the anisotropic property should be considered in the calculation. However, the article deals with only through-the-thickness direction, and therefore, Eqs. (1) and (2) give approximate values. The error associated with this assumption is neglected in this paper.

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Acknowledgements

The work was carried out under a grant from the Ministry of Education, Science, Culture, Sports, Science and Technology of Japan. The Si–Ti–C–O fiber was supplied by Ube Industries Ltd., Ube, Japan

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Author notes

  1. H. Iba

    Present address: Ube Industries, Ltd., Ube, Japan

  2. Y. Imahashi

    Present address: Canon Inc., Tokyo, Japan

Authors and Affiliations

  1. Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Y. Kagawa & K. Matsumura

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  1. Y. Kagawa
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  2. K. Matsumura
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  3. H. Iba
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  4. Y. Imahashi
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Correspondence to Y. Kagawa.

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Kagawa, Y., Matsumura, K., Iba, H. et al. Potential of short Si–Ti–C–O fiber-reinforced epoxy matrix composite as electromagnetic wave absorbing material. J Mater Sci 42, 1116–1121 (2007). https://doi.org/10.1007/s10853-006-1437-1

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  • DOI: https://doi.org/10.1007/s10853-006-1437-1

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