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<p>This study investigates the synthesis of CrMnFeCoNi (Cantor alloy) and its subsequent reinforcement with silicon carbide (SiC) particles (5–20&#xa0;wt.%) via high-energy ball milling to analyze electromagnetic wave attenuation behavior. The composite powders were dispersed in an ethyl cellulose matrix and cast into thin films of 0.3&#xa0;mm and 0.4&#xa0;mm thickness. X-ray diffraction (XRD) confirmed a single-phase face-centered cubic (FCC) structure for the alloy, while scanning electron microscopy (SEM) and elemental mapping verified the uniform dispersion of alloying elements and SiC. EMI shielding measurements in the X-band (8.2–12.4&#xa0;GHz) revealed that the pure Cantor alloy films achieved a total shielding effectiveness SET of − 46&#xa0;dB (0.3&#xa0;mm) and − 43&#xa0;dB (0.4&#xa0;mm). Despite high surface reflection, the effective absorption coefficients A<sub>eff</sub> reached 99.97% and 99.99%, respectively, demonstrating that internal attenuation is governed by absorption. This is further supported by a high dielectric constant (ε’) of approx. 14.5 and a significant loss tangent tan (δ) of approx. 1.68 for the 0.4&#xa0;mm samples, indicating robust dielectric energy dissipation. SiC serves as a dielectric modifier to enhance internal polarization. These findings position the ball-milled Cantor alloy composites as promising candidates for high-performance, lightweight radar-absorbing materials (RAM).</p> Graphical abstract <p></p>

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Ultrathin Cantor alloy-SiC composites: high-performance broadband shields with superior internal attenuation

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Disha Dhiraj Chandak,
  • Om Satishsing Pardeshi,
  • Nithya R Gowda,
  • Shanmugasundaram Thangaraju

摘要

This study investigates the synthesis of CrMnFeCoNi (Cantor alloy) and its subsequent reinforcement with silicon carbide (SiC) particles (5–20 wt.%) via high-energy ball milling to analyze electromagnetic wave attenuation behavior. The composite powders were dispersed in an ethyl cellulose matrix and cast into thin films of 0.3 mm and 0.4 mm thickness. X-ray diffraction (XRD) confirmed a single-phase face-centered cubic (FCC) structure for the alloy, while scanning electron microscopy (SEM) and elemental mapping verified the uniform dispersion of alloying elements and SiC. EMI shielding measurements in the X-band (8.2–12.4 GHz) revealed that the pure Cantor alloy films achieved a total shielding effectiveness SET of − 46 dB (0.3 mm) and − 43 dB (0.4 mm). Despite high surface reflection, the effective absorption coefficients Aeff reached 99.97% and 99.99%, respectively, demonstrating that internal attenuation is governed by absorption. This is further supported by a high dielectric constant (ε’) of approx. 14.5 and a significant loss tangent tan (δ) of approx. 1.68 for the 0.4 mm samples, indicating robust dielectric energy dissipation. SiC serves as a dielectric modifier to enhance internal polarization. These findings position the ball-milled Cantor alloy composites as promising candidates for high-performance, lightweight radar-absorbing materials (RAM).

Graphical abstract