4.7 Article

Fe-doped SiCN composite fibers for electromagnetic waves absorption

Journal

CERAMICS INTERNATIONAL
Volume 47, Issue 1, Pages 1184-1190

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.08.236

Keywords

Polymer-derived method; Electrospinning technology; In-situ reaction; SiCN fibers; EMW absorption

Funding

  1. National Natural Science Foundation of China [51702189]
  2. Natural Science Foundation of Shandong Province [ZR2017BEM033, ZR2019BEM013]
  3. China Postdoctoral Science Foundation [2019M652442, 2019M652441]

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Fe-doped SiCN composite fibers were prepared through thermally-induced polymerization, with the microstructures playing a crucial role in the electromagnetic wave absorption properties. The results showed excellent absorption performance of the Fe-doped composite fibers.
Electrostatic spinning precursor fibers with presence of polysilazane and nano-Fe2O3 were herein derived by a thermally-induced polymerization at 1100 degrees C to prepare Fe-doped SiCN composite fibers. The phases and mi-crostructures were characterized and their influences on properties of permittivity, permeability and electromagnetic waves absorption properties were systematically investigated at 2-18 GHz. During thermal carbonization, the additions of gamma-Fe2O3 nanoparticles were in-situ reduced and transformed into core-shell structured Fe@Si3N4 particles, which were homogenously distributed in SiCN composite fibers. The RLmin of SiCN-Fe0.5 composite fibers reached-22.68 dB at 14.4 GHz with the thickness of 1.5 mm and showed a broad effective absorption bandwidth range (RL <-10 dB, 4.5 GHz, 13.54-17.04 GHz).

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