Ceramics-Silikáty 55, (1) 8 - 13 (2011) |
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PREPARATION AND MICROWAVE ATTENUATION PROPERTY IN THE X BAND OF SiC–C COMPOSITES |
Zhou Zehua, Wang Zehua, Yi Yu,
Jiang Shaoqun,
Zhao Weihua |
College of Mechanics and Materials, Hohai Unoversity, Nanjing 210098, P.R.China
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Keywords: Microwave attenuation, SiC–C composite, Interface match, X band |
For developing an effective, low-cost method on preparation of microwave attenuation material, SiC–C composites with
different additions of graphite grain were fabricated with solid phase sintering and liquid phase sintering, respectively. The
microwave attenuation and the relative electrical properties of composites in the X band were measured. The results show
that both methods are cost-effective and easily controllable processes and Solid phase sintering was more suitable to obtain
SiC-C attenuation composites than the liquid phase sintering. The composite with 3 wt.% C prepared by solid phase sintering
exhibited the best microwave attenuation, the biggest attenuation was -40.5 dB and most attenuations were above -30 dB in
the whole X band. Furthermore, the microwave attenuation of composites depended strongly on the C additions; Match of
interface of wave impedance and high wave consumption are both necessary for microwave attenuation materials. |
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