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<p>Microwave absorption properties of 0–20 wt.% short carbon fiber (SCF) reinforced high-performance poly(ether-ketone-ketone) (PEKK) composites fabricated via fused filament fabrication (FFF) were systematically investigated. The 10 wt.% SCF/PEKK composite exhibited a maximum reflection loss (RL<sub>max</sub>) of − 34.74&#xa0;dB (99.97% absorption) at 9.29&#xa0;GHz with an optimal matching thickness of 2.5&#xa0;mm. Increasing the absorber thickness shifted the RL peak to lower frequencies. However, further increase of SCF to 20 wt.% decreased the value of RL<sub>max</sub> to − 25.20&#xa0;dB at 9.60&#xa0;GHz. A significant increase in RL<sub>max</sub> was attributed to increase in dielectric constant of the composite compared to neat PEKK. However, the dissipation factor of the composites was found lower than that of neat PEKK. These findings highlight the potential of additive manufactured SCF/PEKK composites as lightweight and thin microwave absorbing materials for stealth applications.</p>

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3D printing of thin and lightweight PEKK/SCF composites: superior microwave absorption

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Sushant D. Sale,
  • V. S. Darekar,
  • V. M. Sreekumar,
  • R. K. Goyal

摘要

Microwave absorption properties of 0–20 wt.% short carbon fiber (SCF) reinforced high-performance poly(ether-ketone-ketone) (PEKK) composites fabricated via fused filament fabrication (FFF) were systematically investigated. The 10 wt.% SCF/PEKK composite exhibited a maximum reflection loss (RLmax) of − 34.74 dB (99.97% absorption) at 9.29 GHz with an optimal matching thickness of 2.5 mm. Increasing the absorber thickness shifted the RL peak to lower frequencies. However, further increase of SCF to 20 wt.% decreased the value of RLmax to − 25.20 dB at 9.60 GHz. A significant increase in RLmax was attributed to increase in dielectric constant of the composite compared to neat PEKK. However, the dissipation factor of the composites was found lower than that of neat PEKK. These findings highlight the potential of additive manufactured SCF/PEKK composites as lightweight and thin microwave absorbing materials for stealth applications.