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<p>As aerospace technology rapidly evolves, multi-scale design of multi-functional composites with light weight, robustness, integrated thermal protection/insulation, and even electromagnetic interference (EMI) shielding performance is a pressing priority. C/SiC porous ceramic composites present a compelling option for satisfying the stringent requirements of thermal protection materials in hypersonic vehicles. Herein, a facile strategy is proposed to prepare C<sub>f</sub>/SiC (chopped carbon fibers in reaction-bonded SiC matrix) composite polymer-derived ceramics (PDCs) via a re-pyrolysis process of high-energy ball-milling-induced polycarbosilane-vinyltriethoxysilane-graphene oxide (PVG) with C<sub>f</sub>/SiC(rGO)<sub>p</sub> blend interleaves. <i>In-situ</i> generated honeycomb-like cellular structures originated from SiC(rGO)p and non-directional channels constructed by C<sub>f</sub>, both mitigate density and improve porosity. High-quality SiO<sub>2</sub> joints derived from substantial Si-dangling bonds at interfaces, availably strengthen interfacial bonding via brazing effect to further achieve a tight link between C<sub>f</sub> and framework by carbothermal reduction. Interestingly, <i>in-situ</i> formed SiOCnws develop a hierarchically enhanced network and generate a synergistic toughening effect to improve framework binding strength or raise crack initiation threshold. Such multi-scale interfacial/dipole polarization contributes to enhanced EMI shielding effectiveness. Particularly, C<sub>f(0.2)</sub>/SiC(rGO) composite PDCs present low density (1.49 g cm<sup>−3</sup>), exceptional mechanical properties (fracture toughness: 6.32 MPa m<sup>1/2</sup>, hardness: 7.18 GPa, and compressive strength: 72.67 MPa), remarkable EMI shielding effectiveness (58.31 dB), and good structural stability under butane blowtorch ablation (~1300 °C) for 3600 s. Corresponding porous products by using direct pore-forming agent possess favorable thermal conductivity (0.211 W m<sup>−1</sup> K<sup>−1</sup>) with a substantial porosity of 69.74%. As demonstrated, such multifunctional SiOCnws-C<sub>f</sub>/SiC(rGO) composites offer broad prospects in thermal protection system (TPS) for aerospace vehicles operating in complex environments.</p>

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In-situ polymer-derived SiOCnws-Cf/SiC(rGO) composites: a potential candidate for EMI shielding and thermal management

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Zhichao Xue,
  • Kunhuang Guo,
  • Yufeng Wang,
  • Jiaxue Zhang,
  • Yipeng Guo,
  • Jiahua Zhan,
  • Wenyan Huang,
  • Shengjian Mao,
  • Rongqian Yao

摘要

As aerospace technology rapidly evolves, multi-scale design of multi-functional composites with light weight, robustness, integrated thermal protection/insulation, and even electromagnetic interference (EMI) shielding performance is a pressing priority. C/SiC porous ceramic composites present a compelling option for satisfying the stringent requirements of thermal protection materials in hypersonic vehicles. Herein, a facile strategy is proposed to prepare Cf/SiC (chopped carbon fibers in reaction-bonded SiC matrix) composite polymer-derived ceramics (PDCs) via a re-pyrolysis process of high-energy ball-milling-induced polycarbosilane-vinyltriethoxysilane-graphene oxide (PVG) with Cf/SiC(rGO)p blend interleaves. In-situ generated honeycomb-like cellular structures originated from SiC(rGO)p and non-directional channels constructed by Cf, both mitigate density and improve porosity. High-quality SiO2 joints derived from substantial Si-dangling bonds at interfaces, availably strengthen interfacial bonding via brazing effect to further achieve a tight link between Cf and framework by carbothermal reduction. Interestingly, in-situ formed SiOCnws develop a hierarchically enhanced network and generate a synergistic toughening effect to improve framework binding strength or raise crack initiation threshold. Such multi-scale interfacial/dipole polarization contributes to enhanced EMI shielding effectiveness. Particularly, Cf(0.2)/SiC(rGO) composite PDCs present low density (1.49 g cm−3), exceptional mechanical properties (fracture toughness: 6.32 MPa m1/2, hardness: 7.18 GPa, and compressive strength: 72.67 MPa), remarkable EMI shielding effectiveness (58.31 dB), and good structural stability under butane blowtorch ablation (~1300 °C) for 3600 s. Corresponding porous products by using direct pore-forming agent possess favorable thermal conductivity (0.211 W m−1 K−1) with a substantial porosity of 69.74%. As demonstrated, such multifunctional SiOCnws-Cf/SiC(rGO) composites offer broad prospects in thermal protection system (TPS) for aerospace vehicles operating in complex environments.