Enhanced microwave-absorption properties of polymer-derived SiC/SiOC composite ceramics modified by carbon nanowires

Xiaoling Liu, Jimei Xue, Fangyuan Ren, Fang Ye, Xiaomeng Fan, Yongsheng Liu, Laifei Cheng

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Novel microwave-absorbing SiOC composite ceramics with dual nanowires (carbon nanowires (CNWs) and SiC nanowires) with high performances were fabricated by using the polymer-derivation method and heat treatment in Ar atmosphere. The introduction of CNWs in the amorphous SiOC ceramics promotes the ceramic crystallization into SiC nanoparticles and SiC nanowires at lower annealing temperatures, which leads to multi-phases and multiple nano heterogeneous interfaces. The distinctive architectures largely increase the interfacial and dipole polarizations of the composite ceramics. The CNWs/SiC/SiOC composite ceramics exhibit excellent microwave-absorption properties in the Ku band (12.4–18 GHz). The minimum reflection coefficient (RC) is -24.5 dB at a thickness of 1.8 mm, while the maximum effective absorption bandwidth (EAB, the corresponding frequency band in which RC is smaller than -10 dB) is 4.8 GHz at a thickness of 1.9 mm, which make the CNWs/SiC/SiOC composite ceramics promising electromagnetic-wave-absorbing materials.

Original languageEnglish
Pages (from-to)20742-20750
Number of pages9
JournalCeramics International
Volume46
Issue number13
DOIs
StatePublished - Sep 2020

Keywords

  • Carbon nanowires
  • Microwave-absorption properties
  • Polymer-derived ceramics
  • SiC nanowires

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