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<p>Currently, high-temperature ceramic-based microwave-absorbing composites face limitations such as a limited range of material systems and narrow effective absorption bandwidth, which hinder their further application in electromagnetic wave absorption field under high-temperature environments. Herein, guided by electromagnetic simulation, a lightweight (1.61&#xa0;g/cm<sup>3</sup>), ultra-broadband (32.45&#xa0;GHz) high-temperature (800 °C) meta-structure TiC<sub>x</sub>N<sub>1-x</sub> fibers/Si<sub>3</sub>N<sub>4</sub> microwave-absorbing composite was prepared by combining material composition and structural design with the quick gel casting process (20 min). Density functional theory calculations confirmed the presence of strong interfacial bonding (− 1.77&#xa0;J/m<sup>2</sup>) between TiC<sub>x</sub>N<sub>1-x</sub> fibers and the matrix. After introducing only 4 wt% TiC<sub>x</sub>N<sub>1-x</sub> fibers, the flexural strength and fracture toughness of the composite sample increased by 56.24% and 111.48%, respectively. Moreover, the sample exhibited superior electromagnetic wave absorption performance in the Ku-band at 800&#xa0;°C compared to room temperature. Based on the electromagnetic parameters of the sample introducing 4 wt% TiC<sub>x</sub>N<sub>1-x</sub> fibers and the results of electromagnetic simulation calculations, a sample with a trapezoidal pyramidal meta-structure of 180 mm × 180&#xa0;mm was designed and fabricated. An ultra-wideband (8.25 ~ 40&#xa0;GHz, X, Ku, K, and Ka) effective absorption for electromagnetic wave in the 2 ~ 40&#xa0;GHz frequency range was achieved, which is in good agreement with the electromagnetic simulation results. This study offers a fresh approach to designing lightweight, ultra-wideband, structural–functional integrated ceramic-based microwave absorbing composites for high-temperature environments.</p>

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Structural design and simulation of ultra-broadband TiCxN1-x fibers/Si3N4 high-temperature microwave absorbing composites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月4日

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  • Guandong Liang,
  • Jianqiang Bi,
  • Shuyong Liang,
  • Chengjiao Che,
  • Lintao Liu,
  • Shouliang Bie,
  • Yao Yang

摘要

Currently, high-temperature ceramic-based microwave-absorbing composites face limitations such as a limited range of material systems and narrow effective absorption bandwidth, which hinder their further application in electromagnetic wave absorption field under high-temperature environments. Herein, guided by electromagnetic simulation, a lightweight (1.61 g/cm3), ultra-broadband (32.45 GHz) high-temperature (800 °C) meta-structure TiCxN1-x fibers/Si3N4 microwave-absorbing composite was prepared by combining material composition and structural design with the quick gel casting process (20 min). Density functional theory calculations confirmed the presence of strong interfacial bonding (− 1.77 J/m2) between TiCxN1-x fibers and the matrix. After introducing only 4 wt% TiCxN1-x fibers, the flexural strength and fracture toughness of the composite sample increased by 56.24% and 111.48%, respectively. Moreover, the sample exhibited superior electromagnetic wave absorption performance in the Ku-band at 800 °C compared to room temperature. Based on the electromagnetic parameters of the sample introducing 4 wt% TiCxN1-x fibers and the results of electromagnetic simulation calculations, a sample with a trapezoidal pyramidal meta-structure of 180 mm × 180 mm was designed and fabricated. An ultra-wideband (8.25 ~ 40 GHz, X, Ku, K, and Ka) effective absorption for electromagnetic wave in the 2 ~ 40 GHz frequency range was achieved, which is in good agreement with the electromagnetic simulation results. This study offers a fresh approach to designing lightweight, ultra-wideband, structural–functional integrated ceramic-based microwave absorbing composites for high-temperature environments.