Preparation and Microwave Absorbing Property of SiC/C Fibers with Shell Core Structure

Abstract

Abstract: SiC/C fibers with shell core structure were prepared by activated carbon fiber conversion method. The effects of SiC thickness on thermogravimetry and microwave absorption property of SiC/C fibers with shell core structure were studied by Raman spectroscopy, SEM, XRD and thermogravimetric analysis. The results show that the microwave absorbing property of the samples coated with SiC shell are improved. When the thickness of the sample is 3.0 mm, the minimum reflection loss of the sample after holding for 4 h reaches -17.22 dB at 8.24 GHz, and the frequency bandwidth less than -10 dB (90% of electromagnetic wave is absorbed) reaches 4.8 GHz (11.12 GHz to 15.92 GHz) at 2.0 mm. The minimum reflection loss of the sample kept for 3 h reaches -14.45 dB at 8.23 GHz, which is lower than -10 dB (90% of electromagnetic wave is absorped) bandwidth reaches 4.56 GHz at 2.0 mm (10.88 GHz to 15.44 GHz). With the increase of SiC content, the microwave absorption property of the samples are enhanced. The initial oxidation temperature of SiC/C fiber samples with core-shell structure is increased by more than 150 ℃, and the final residual mass is about 50%. That is to say, the oxidation resistance of the samples coated with SiC fibers is greatly improved.

Key words: core shell structure SiC/C fiber, carbon fiber activity conversion method, oxidation resistance, absorbing property, electromagnetic reflection loss coefficient

CLC Number:

TB34

WANG Kun, ZHANG Tao, WANG Jian, XIA Long. Preparation and Microwave Absorbing Property of SiC/C Fibers with Shell Core Structure[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1378-1387.

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