Abstract
The microstructure, electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of CNTs/Mg Matrix composites prepared by accumulative roll bonding (ARB) were systematically investigated to understand the effects of CNTs on the electromagnetic interference shielding effectiveness property of magnesium. A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed composites. The experimental results indicated that the methods were feasible to prepare laminated composites. The SE of the material increased gradually with the increase of electrophoretic deposition time. When the electrophoretic deposition time reached 8 min, the value of SE remained 87–95 dB in the frequency range of 8.2–12.4 GHz. The increase in SE was mainly attributed to the improvement in the reflection and multiple reflection losses of incident electromagnetic wave due to the increased amounts of CNTs and interfaces. The methods provided an efficient strategy to produce laminated metal matrix composites with high electromagnetic shielding properties.
Highlights
With the rapid popularization of electronic equipment and the continuous improvement of the utilization rate, electronic noise, electromagnetic interference(EMI) and radio frequency interference, other electronic pollutions increase sharply [1,2], which will lead to the abnormal operation of electronic equipment and harm human health [3,4,5]
Traditional metal materials, such as copper, nickel, and permalloy have the drawback of their heavy weight [8,9]; polymer composites are light in weight, but they suffer in terms of their cost and low strength [10,11,12,13], so they cannot be used as structural materials; and coats materials are easy to shed
Chen et al explored the different Nb contents on the electromagnetic interference (EMI) shielding properties of an Mg–Y–Zr–Nd alloy, and it was found that the EMI shielding effectiveness of the alloy could be improved by the precipitated second phases of Mg24Y5, Mg41Nd5, and β phase with a Mg41Nd5Y composition [3]; Liu et al reported that Ce addition induced the formation of the Mn–Zn–Ce phase, which was beneficial to improve the SE [19]
Summary
With the rapid popularization of electronic equipment and the continuous improvement of the utilization rate, electronic noise, electromagnetic interference(EMI) and radio frequency interference, other electronic pollutions increase sharply [1,2], which will lead to the abnormal operation of electronic equipment and harm human health [3,4,5]. In order to ease the pollution of electromagnetic interference, it is imperative to develop EMI shielding materials [7]. It is urgent to develop light weight and cost-effective shielding materials, especially in portable electronics and aerospace industries [8]. High specific stiffness, high specific strength, excellent damping capacity, recyclability, and easy fabrication [14,15,16] while possessing good electromagnetic shielding property [5]. Chen et al explored the different Nb contents on the electromagnetic interference (EMI) shielding properties of an Mg–Y–Zr–Nd alloy, and it was found that the EMI shielding effectiveness of the alloy could be improved by the precipitated second phases of Mg24Y5, Mg41Nd5, and β phase with a Mg41Nd5Y composition [3]; Liu et al reported that Ce addition induced the formation of the Mn–Zn–Ce phase, which was beneficial to improve the SE [19].
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