Effect of chemical vapor infiltration treatment on the wave-absorbing performance of carbon fiber/cement composites |
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Authors: | Kezhi Li Chuang Wang Hejun Li Lingjun Guo Jihua Lu |
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Affiliation: | aSchool of Materials Science, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | Short carbon fibers were treated at high temperatures around 1100℃ through chemical vapor infiltration technology.A thinner layer ofpyrocarbon was deposited on the fiber surface.The dispersion of carbon fibers in a cement matrix and the mechanical properties of carbon fiber/cement composites were investigated by scanning electron microscopy (SEM) and other tests.The reflectivity of electromagnetic waves by the composites was measured in the frequency range of 8.0-18 GHz for different carbon fiber contents of 0.2wt%,0.4wt%,0.6wt% ,and 1.0wt%.The results show that the reflectivity tends to increase with the increase of fiber content above 0.4wt%.The minimum reflectivity is -19.3 dB and the composites exhibit wave-absorbing performances.After pyrocarbon is deposited on the fiber,all the reflectivity data are far greater.They are all above -10 dB and display mainly wave-reflecting performances. |
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Keywords: | carbon fibers chemical vapor infiltration cement reflectivity wave-absorbing property Acknowledgments |
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