Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (11): 1223-1227.DOI: 10.3724/SP.J.1077.2012.12364

• Research Letter • Previous Articles     Next Articles

Anisotropic Dielectric Properties of Short Carbon Fiber Composites

FU Jin-Gang, ZHU Dong-Mei, ZHOU Wan-Cheng, LUO Fa   

  1. (State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China)
  • Received:2012-06-01 Revised:2012-06-13 Published:2012-11-20 Online:2012-10-25
  • About author:FU Jin-Gang(1987–), male, candidate of master degree. E-mail:
  • Supported by:

    National Natural Science Foundation of China(51072165)

Abstract: Dielectric materials based on short carbon fiber (Csf) dispersed inside epoxy resin (EP) matrix composites were prepared. The complex permittivity of two types of distributions over the frequency range from 2.6 GHz to 8.2 GHz was reported. The effects of orientation with different content and length of carbon fibers on dielectric properties were investigated. It is found that axial permittivity of carbon fibers is several times larger than their radial permittivity. The real and imaginary parts of complex permittivity increase gradually with increasing the Csf contents in the composites, and the fiber length also affects the anisotropic property greatly. The two layered transmission line model is used to explain the phenomena.

Key words: anisotropic, dielectric properties, composite materials, short carbon fiber

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