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Enhanced Electromagnetic Interference Shielding Effectiveness of an Eco-Friendly Cenosphere-Filled Aluminum Matrix Syntactic Foam

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Abstract

Electromagnetic interference (EMI) cause the equipments used in electronics and avionics industries to either deteriorate or malfunction. Therefore, EMI shielding is essential to ensure electronics equipment safety. The present investigation explores the EMI shielding effectiveness of micro-size cenosphere (2 wt.%, 4 wt.%, and 6 wt.%) filled aluminum matrix syntactic foams. The aluminum matrix syntactic foams were fabricated using stir-casting. The prepared samples were studied for their EMI shielding, microstructural characterization, compressive deformation behavior, and hardness. The cenosphere-filled aluminum syntactic foam exhibited better EMI shielding effectiveness, varied from −41.38 dB to −56.68 dB measured in the frequency range 8 to 12 GHz. This is due to microwave absorption and the dielectric nature of porous cenosphere fillers in the syntactic foam. The highest plateau strength 316.48 MPa and compressive yield strength of 289.53 MPa was achieved in 6 wt% cenosphere-filled syntactic foam. The microstructural study showed the presence of cenospheres in spherical form with homogeneous distribution. The observation shows good bonding between the matrix and cenosphere filler element. The micro-hardness measurement varied from 114 HV to 125.6 HV for the cenosphere filled syntactic foam (up to 4 wt %); further increasing the cenosphere wt% reduced the hardness. The XRD analysis showed the presence of reaction compounds AlSiO2, and Al2SiO5 which enhanced the brittleness in the syntactic foams.

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Abbreviations

EMI:

Electromagnetic interference

XRD:

X-ray diffraction

SEM:

Scanning electron microscopy

EDS:

Energy-dispersive spectroscopy

GHz:

Gigahertz

SER :

Reflection shielding effectiveness

SEA :

Absorption shielding effectiveness

SET :

Total shielding effectiveness

dB:

Decibel

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Acknowledgments

The authors would like to thank the Management of VIT University and the Dean, SMEC, VIT Chennai, India, for their support to publish this work.

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Correspondence to M. Senthil Kumar.

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Thiyagarajan, R., Senthil Kumar, M. Enhanced Electromagnetic Interference Shielding Effectiveness of an Eco-Friendly Cenosphere-Filled Aluminum Matrix Syntactic Foam. J. Electron. Mater. 51, 6951–6963 (2022). https://doi.org/10.1007/s11664-022-09925-9

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