In situ growth of the Y₃Si₂C₂ interphase in SiC_f‐reinforced mullite ceramics for enhanced electromagnetic wave absorption

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

Abstract To meet the rigorous demands placed on electromagnetic (EM) wave absorbing (EWA) materials by harsh service conditions and to reduce EM power density, development of ceramic‐based EWA with high reliability stability has become a subject significant focus. In this study, yttrium silicide carbide interphase was in situ synthesized silicon fibers fabricate Y₃Si₂C₂–SiC f composite molten salt method. These were then incorporated into mullite ceramic matrix, /mullite composites prepared gel injection molding, aiming at enhancing properties. The exhibited reflection loss −28.97 dB 2.44 mm thickness an effective absorption bandwidth 3.066 GHz, outperforming pure SiC due addition . A modified Drude–Lorentz model developed capture multi‐peak permittivity behavior composites. results showed that dipole relaxation hopping migration localized electrons played key roles overall microwave energy attenuation, which closely matched experimental data. Furthermore, simulations electric field distribution radar cross‐section confirmed superior capability practical application potential This study offers valuable theoretical insights design ‐reinforced materials.

Language: Английский

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Remarkably Enhance the Stealth/Resistance/Mechanical Properties of Silica‐Zirconia Ceramic Aerogel by Phase Transitions and Interface Evolution

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Abstract Multifunctionality and high‐temperature resistance are crucial for ceramic fiber aerogels (CFAs) used in extreme thermal environments. However, integrating multi‐functional elements into a cohesive assembly is complex costly. Moreover, the brittleness of nanoceramic fibers grain growth at elevated temperatures have long limited their stability. This study proposes method to coordinately optimize performance stealth, resistance, mechanical properties by regulating configurational entropy values (CEVs) electrical individual nanofibers. Additionally, these parameters can be simply adjusted controlling phase transitions interface evolution within silicon‐zirconium induced effects. The relationship between temperature, CEVs, resultant discussed detail. Furthermore, optimizing fineness, aspect ratio, stacking configuration through pressure‐assisted collection method, finely tuned multiscale structured CFAs achieved. resulting exhibit excellent strength (compressive 335.5 kPa, energy loss coefficient 0.45), acoustics (SAC 0.87, STL 34.8 dB), insulation (λ = 0.034 W·m −1 ·K ), electromagnetic wave absorption (−26.6 dB 3.5 mm). paves novel way design lightweight, high‐temperature‐resistant with multifunctional integration use

Language: Английский

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A novel CNTs/Co9S8 microsphere composites with three-dimensional network structure for efficient electromagnetic wave absorption

Diamond and Related Materials, Journal Year: 2025, Volume and Issue: unknown, P. 112351 - 112351

Published: April 1, 2025

Language: Английский

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Phase modulation of a novel perovskite ceramic BaZr0.4Ce0.3Y0.1Yb0.1Fe0.1O3 for enhanced electromagnetic wave absorption

Journal of Materials Science Materials in Electronics, Journal Year: 2025, Volume and Issue: 36(12)

Published: April 1, 2025

Language: Английский

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