Electromagnetic Interference Shielding Characteristics of Sn-Al Powder Coating Layers

Hung, Fei Shuo; Hung, Fei-Yi; Chiang, Che Ming; Lui, Truan-Sheng

doi:10.2320/matertrans.mer2007252

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…The experiment was conducted by measuring the wavelength corresponding to perpendicular projection, while the frequency range was controlled in between 50MHz and 3000MHz. Meanwhile, the results of each measurement were averaged 3 to 7 points, and the effective shielding rate was observed by performing further calculations [10][11].…”

Section: Experimental Designmentioning

confidence: 99%

Multi-Layered Effects of Fe on EMI Shielding of Sn-Al Hotel Architectural Powder

Hung

2016

MATEC Web Conf.

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.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.

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Section: Experimental Designmentioning

confidence: 99%

Multi-Layered Effects of Fe on EMI Shielding of Sn-Al Hotel Architectural Powder

Hung

2016

MATEC Web Conf.

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“…Therefore, many studies have been conducted on the suitability of materials for shielding electromagnetic radiation [12][13][14][15]. With the aim of enhancing the shielding effect, Hung [16,17] used sputtered Sn-Al and Sn-Cu thin films and studied the crystallization mechanism, the impact of film thickness on electromagnetic interference (EMI) properties, and the shielding effect against EMI by coating a composite colloid containing a mixture of Sn-Al powder and polyethylene on glass. The study confirmed that the relationship between coating thickness and shielding was constrained by certain factors.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Elastic Properties of Al/PET Isotropic Composite Materials Using Finite Element Method

2022

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This study uses the finite element method and numerical analysis to develop an eco- -friendly composite material with shielding capabilities. A preliminary study was performed to predict the mechanical properties of the composite material. Polyethylene terephthalate and aluminum powder (AP) were selected as the matrix and enhancer, respectively. The particles of AP are spherical, with a diameter of 1 μm. Material properties were investigated as the AP volume fraction (VF) increased from 5–70%. The FEM results show that the physical properties for AP VFs improve by up to 40%, but there is no significant change in the elastic modulus, shear modulus, and Poisson’s ratio at an AP VF of 50–70%. However, the numerical analysis models show that the elastic properties for AP VFs improve by up to 70%. The mechanical properties improved as the VF increased, and the FEM predicted values were reliable for VFs up to 40%. However, it was confirmed that 40% is the limit of AP VF in the FEM. In addition, the FEM and numerical analysis predictions showed that the most similar numerical analysis model was the Halpin–Tsai model. The predictions of the Halpin–Tsai model allowed prediction of the maximum VF above the FEM limit. If the correction coefficients of the FEM and numerical analysis models are derived based on the predictions of this study and future experimental results, reliable predictions can be obtained for the physical properties of composite materials.

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“…Up to now, many research teams have been actively exploring various shielding methods. In all the shielding methods, the surface treatment methods, such as conductive film [18,19] and conductive powder [20][21][22][23][24], have had better shielding effects. However, they are easy to wear, peel, oxidize, difficult to process and expensive, etc.…”

Section: Introductionmentioning

confidence: 99%

Material Application of a Transformer Box: A Study on the Electromagnetic Shielding Characteristics of Al–Ta Coating Film with Plasma-Spray Process

Hung

2019

Coatings

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In this study we present the results of two experiments. In the first one, a Ta–Al–SS (stainless steel (SS)) multilayer coating structure was prepared using plasma spraying equipment to investigate the coating structure and interface properties. In the second one, Ta–Al on multilayer glass was prepared using the sputtering process to measure the thickness effect of thin film on electromagnetic wave shielding (EMI) characteristics and on the design of high-power switchboard covers. According to the experimental results, the multilayer structure of Ta–Al on SS improves the mechanical properties of a stainless steel plate by enhancing the explosion-proof property. An appropriate thickness of the plasma-sprayed pure aluminum layer can increase the adhesion to the stainless steel substrate and buffer the stress effect. After heat treatment (annealing), the Ta–Al–SS multilayer structural characteristics are excellent and suitable for shielding effects at different temperatures and humidity, which can be used as a reference for the engineering application of communication rooms and base power stations. According to EMI test of multi-coated glass (Ta–Al–glass), by increasing the thickness of Ta layer, we cannot effectively improve full-frequency EMI shielding with improved shielding at low-mid frequency condition. In addition, the Ta–Al interface formation of an Al–Ta–O compound layer can improve the adiabatic effect to reduce the thermal conductivity.

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Electromagnetic Interference Shielding Characteristics of Sn-Al Powder Coating Layers

Cited by 9 publications

References 18 publications

Multi-Layered Effects of Fe on EMI Shielding of Sn-Al Hotel Architectural Powder

Multi-Layered Effects of Fe on EMI Shielding of Sn-Al Hotel Architectural Powder

Analysis of Elastic Properties of Al/PET Isotropic Composite Materials Using Finite Element Method

Material Application of a Transformer Box: A Study on the Electromagnetic Shielding Characteristics of Al–Ta Coating Film with Plasma-Spray Process

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