Electromagnetic interference shielding reaching 70 dB in steel fiber cement

Wen, Sihai; Chung, D.D.L.

doi:10.1016/j.cemconres.2003.08.014

Cited by 162 publications

(64 citation statements)

References 13 publications

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“…It is worth noting that for the asextruded ZK60-1.0Ce alloy the EMI SE kept as high as 71-81 dB at the whole frequency range, which even meets the military requirement of 60-120 dB [11]. Wen and Chung [23] elevated the EMI SE of cement up to 70 dB by adding stainless steel fibers; however, the thickness of the cement composite was 9.5 mm, which was 4.75 times higher than that of the ZK60-1.0Ce alloys. The EMI SE of as-extruded ZK60-1.0Ce alloy was able to be improved further by direct artificial aging, as shown in Fig.…”

Section: Resultsmentioning

confidence: 96%

Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

Chen

Liu

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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The effects of Ce addition on microstructure and electromagnetic interference (EMI) shielding response of Mg6Zn-0.5Zr (ZK60) alloy have been investigated. Ce addition resulted in grain refinement and higher density of Mg-Zn-Ce and MgZn 2 intermetallic particles in the alloy. In particular, this was substantially remarkable as the addition of Ce was up to 1.0 wt%. It is interesting to note that as-extruded ZK60 alloy with 1.0 wt% Ce addition exhibited an EMI shielding effectiveness (SE) exceeding 70 dB at the frequency range of 30-1,500 MHz, which was significantly higher than that of ZK60 alloy without Ce addition and reached the requirement of high protection. The superior SE was probably related to the increased reflection and multiple reflection of electromagnetic radiation induced by Ce addition. Direct artificial aging at 150°C for 25 or 50 h led to a further increase of 7-10 dB in the SE of the alloy with 1.0 wt% Ce addition. The advantages of excellent shielding capacity and favorable mechanical strength make the Mg-Zn-Zr-Ce alloy an attractive shielding candidate material for a variety of technological applications.

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Section: Resultsmentioning

confidence: 96%

Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

Chen

Liu

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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“…Due to their high electrical conductivity and ferromagnetic character, steel fibers are attractive for shielding. 31 However, the high density of steel requires viscosity enhancement, which is provided by the use of graphite flakes. Without the graphite flakes, the steel fibers form agglomerates, as observed in this work.…”

Section: Introductionmentioning

confidence: 99%

Pastes for electromagnetic interference shielding

Chung

2005

J. Electron. Mater.

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A paste has been developed for electromagnetic interference shielding by mixing stainless steel fibers (8-µm diameter) and graphite flakes (5 µm) in a water-based graphite colloid (containing submicron graphite flakes and a binder) in a volume ratio 0.5:20:100. The resulting coating of thickness 0.1-0.2 mm after drying exhibits shielding effectiveness of 34 dB at 1 GHz, primarily due to reflection. The paste is superior to those containing graphite flakes or carbon filaments (0.1-µm diameter), due to the higher shielding effectiveness of the steel fibers. The graphite flakes in the paste serves to help suspend the steel fibers, in addition to contributing to shielding.

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“…The subject paper neglected the paper by Wen and Chung [1] that reported a shielding effectiveness of 70 dB (1.5 GHz) for cement containing 0.72 vol.% stainless steel fiber of diameter 8 lm. This value of the shielding effectiveness is the highest that has been reported for cement-based materials.…”

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confidence: 96%

Comment on “Cement based electromagnetic shielding and absorbing building materials” by Guan et al.

Chung¹

2008

Cement and Concrete Composites

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Electromagnetic interference shielding reaching 70 dB in steel fiber cement

Cited by 162 publications

References 13 publications

Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

Pastes for electromagnetic interference shielding

Comment on “Cement based electromagnetic shielding and absorbing building materials” by Guan et al.

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