Mechanical and electromagnetic shielding properties of carbon fiber reinforced silicon carbide matrix composites

Lingqi Chen, Xiaowei Yin, Xiaomeng Fan, Meng Chen, Xiaokang Ma, Laifei Cheng, Litong Zhang

Research output: Contribution to journalArticlepeer-review

203 Scopus citations

Abstract

Carbon fiber reinforced SiC matrix composites (Cf/SiC) were fabricated through chemical vapor infiltration. Effects of SiC content on the mechanical and electromagnetic properties of the as-prepared materials were studied systematically. The high volume fraction of SiC matrix is beneficial to the transfer of load to carbon fiber. With the increase of SiC content from 21.5 to 42.2 vol.%, the total porosity decreases from 38.5 to 17.8 vol.%, the flexural strength and fracture toughness of Cf/SiC increase from 38 ± 4 to 375 ± 10 MPa and from 6.2 ± 0.7 to 21 ± 0.3 MPa m1/2. The electromagnetic interference shielding effectiveness of as-prepared Cf/SiC decreases from 43 ± 1.4 to 31 ± 1.1 dB over the frequency range of 8.2-12.4 GHz with the increase of SiC content. The decease of electromagnetic interference shielding effectiveness is mainly attributed to the decline of absorption loss. With the increase of SiC content, the electrical conductivity of Cf/SiC diminishes, leading to the conspicuous drop of the conductive loss, which plays the key role in lowering the absorption loss of electromagnetic waves.

Original languageEnglish
Pages (from-to)10-19
Number of pages10
JournalCarbon
Volume95
DOIs
StatePublished - 11 Oct 2015

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