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<p>Oxide/oxide ceramic matrix composites (CMCs) exhibit excellent mechanical properties and high-temperature electromagnetic (EM) absorption performance, which make them suitable for stealth applications such as in radar-absorbing structures (RASs). In this study, oxide/oxide CMCs comprising pristine and Ni-plated Nextel™ 610 fibers embedded in alumina matrices were fabricated using a low-temperatures of 80 and 100&#xa0;°C and low-pressure of 0.7&#xa0;MPa process, which offers notable advantages over conventional ceramic processing techniques. The porosity and fiber volume fraction were optimized to enhance the mechanical performance and achieve high tensile, compressive, and shear strengths. The composites were then used to fabricate a multilayer RAS, which demonstrated an excellent EM absorption performance in the X-band frequency range (8.2–12.4&#xa0;GHz) that was stable from room temperature to 900&#xa0;°C. The performance was a marked improvement over that of previous CMCs and can be attributed to the high dielectric and oxidation resistances and excellent chemical stability of the composites.</p> Graphical abstract <p></p>

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Low-temperature/low-pressure fabrication of oxide/oxide ceramic matrix composites with excellent mechanical properties and stealth capabilities

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月1日

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  • Shanigaram Mallesh,
  • Dong-Jun Hong,
  • Hyunseok Ko,
  • Sanghun Lee,
  • Chae-Hwan Lim,
  • Won-Ho Choi,
  • Young-Woo Nam

摘要

Oxide/oxide ceramic matrix composites (CMCs) exhibit excellent mechanical properties and high-temperature electromagnetic (EM) absorption performance, which make them suitable for stealth applications such as in radar-absorbing structures (RASs). In this study, oxide/oxide CMCs comprising pristine and Ni-plated Nextel™ 610 fibers embedded in alumina matrices were fabricated using a low-temperatures of 80 and 100 °C and low-pressure of 0.7 MPa process, which offers notable advantages over conventional ceramic processing techniques. The porosity and fiber volume fraction were optimized to enhance the mechanical performance and achieve high tensile, compressive, and shear strengths. The composites were then used to fabricate a multilayer RAS, which demonstrated an excellent EM absorption performance in the X-band frequency range (8.2–12.4 GHz) that was stable from room temperature to 900 °C. The performance was a marked improvement over that of previous CMCs and can be attributed to the high dielectric and oxidation resistances and excellent chemical stability of the composites.

Graphical abstract