Experimental Investigation on Fabrication of Cermet Hollow Spheres for Use as Reinforcement in the Production of Lightweight and Strong Metal Foams for High Energy Absorption Applications

Zewdie, Fisseha; Narayan, Dhruv; Srivastava, Alok; Bhatnagar, Naresh

doi:10.1007/s11665-024-09339-0

J. of Materi Eng and Perform

2024

DOI: 10.1007/s11665-024-09339-0

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Experimental Investigation on Fabrication of Cermet Hollow Spheres for Use as Reinforcement in the Production of Lightweight and Strong Metal Foams for High Energy Absorption Applications

Fisseha Zewdie,

Dhruv Narayan,

Alok Srivastava

et al.

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Fabrication and Performance Regulation of Lightweight Porous Electromagnetic Absorbing Materials via CO2 Nucleation-Free Foaming of EP

Dong,

Quan,

Huang

et al. 2024

Polymers

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In this study, CO2 reacted with a curing agent through nucleophilic addition to form ammonium salts, enabling the stable capture and internal release of CO2, which achieved gas-phase nucleation and foaming. Additionally, the introduction of wave-absorbing agents improved the absorption mechanism and promoted uniform foaming. This nucleation-free foaming process relies on the induced growth of gas nuclei and the synergistic effect of the wave-absorbing agents, effectively preventing the uneven foaming issues caused by traditional nucleating agents. Ultimately, a lightweight epoxy foam absorbing material (LFAM) was developed. BET tests showed that 2.0 wt% carbon-based wave-absorbing agents (LFAMs–A2) expanded the material’s volume to 4.6 times its original size, forming a uniform porous structure. VNA tests revealed that LFAMs–A2 achieved a minimum reflection loss of −13.25 dB and an absorption bandwidth of 3.7 GHz in the 12–18 GHz range. The material with 2.0 wt% ferrite-based wave-absorbing agents (LFAMs–C2) achieved a minimum reflection loss of −26.83 dB at 16.6 GHz and an absorption bandwidth of 5.3 GHz, nearly covering the Ku band. DSC tests indicated that the material maintained good thermal stability at 150 °C. This study provides a new approach for lightweight coatings and structural optimization, with broad application potential in 5G communications, microwave anechoic chambers, and aerospace fields.

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Fabrication and Performance Regulation of Lightweight Porous Electromagnetic Absorbing Materials via CO2 Nucleation-Free Foaming of EP

Dong,

Quan,

Huang

et al. 2024

Polymers

View full text Add to dashboard Cite

show abstract

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Experimental Investigation on Fabrication of Cermet Hollow Spheres for Use as Reinforcement in the Production of Lightweight and Strong Metal Foams for High Energy Absorption Applications

Cited by 1 publication

References 44 publications

Fabrication and Performance Regulation of Lightweight Porous Electromagnetic Absorbing Materials via CO2 Nucleation-Free Foaming of EP

Fabrication and Performance Regulation of Lightweight Porous Electromagnetic Absorbing Materials via CO2 Nucleation-Free Foaming of EP

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