Fabrication and microwave absorbing properties of FeCoNiAl@C/CCB/NR absorbing patches
In recent years,rubber wave-absorbing patches have been widely used in various electronic devices due to their excellent mechanical and wave-absorbing properties,ensuring the normal operation of equipment without electromagnetic(EM)interference.This article employs mechanical stirring,carbothermal reduction,as well as mastication and vulcanization processes to prepare FeCoNiAl@C/conductive carbon black(CCB)/nat-ural rubber(NR)wave-absorbing patches with superior mechanical and wave-absorbing properties,and adjusts the addition amount of FeCoNiAl@C to regulate the mechanical and wave-absorbing properties of the patches.The phase composition and microstructure of the FeCoNiAl@C composite material were characterized,and the microwave absorption performance and wave-absorbing mechanism of the patches were studied.The results show that when the addition amount of FeCoNiAl@C is 5.0 g,the FeCoNiAl@C/CCB/NR wave-absorbing patch exhibits a minimum reflection loss(RL)of-24.45 dB at 4.40 GHz and a thickness of 5.0 mm,with an ef-fective absorption bandwidth(EAB)of 1.60 GHz.When the thickness is 1.5 mm,the EAB can reach 3.04 GHz.The excellent wave-absorbing performance of the patch is attributed to the excellent impedance matching of the absorber and the synergistic effect of multiple loss mechanisms.This work provides new insights for the struc-tural design and practical application of natural rubber-based wave-absorbing patches.
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