Abstract
No evident effect in shielding efficiency is observed when the electromagnetic wave-absorbing coating materials were applied in single layers because of the dispersing nature of the powder. When increased to two-layer coating, shielding effects were evident at both high and low frequencies, with greater shielding efficiency at low frequencies over high frequencies. It is worth noting that when increased to three-layer coating, as the weight percentage of powdered Fe increased from 5% to 8% , the shielding efficiency of the powdered-Fe composite material was raised to -35 dB This shows that, as the weight percentage gets higher, the powder shows the resonance phenomenon of permeability spectrum, and at high frequencies, the electromagnetic wave shielding efficiency of the composite materials were greatly increased. As the weight percentage of the powered Fe were increased to 8% , we were unable to spread the powder evenly in the epoxy because of the dispersing characteristic in the electromagnetic properties of Fe and the anisotropic and heterogeneous nature of a powered composite material. During production, the powder aggregates often resulted in greater heterogeneity in the materials and consequently, lowered shielding efficiency at 3GHz.
Highlights
Iron plays an important role in building materials; the ferrite magnet in the heavy metal ions of iron oxide are embedded in a stable state in the lattice [1,2]
After stirring the Sn-Al-Fe mixed with polypropylene resin, the composite colloid was coated on a glass substrate, and allowed to cure at room temperature for 24 hours
The obtained results were correlated with the evolution of the electromagnetic wave shielding related properties .The Elgal set 19A coaxial holder was used for electromagnetic interference shield testing
Summary
Iron plays an important role in building materials; the ferrite magnet in the heavy metal ions of iron oxide are embedded in a stable state in the lattice [1,2]. The stability of the solid solution which in heavy metals is not perturbed and the chemical stability of heavy metals can be prevented. In addition to addressing environmental pollution [3,4,5,6],. The excellent magnetic properties of iron [7], the associated adsorption, conductivity[8], cost-competitiveness and EMI shielding and other potential applications are some of the advantages [9]
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