Measurement of Electromagnetic Shielding Effectiveness of the Composite Carbon Fibers/Nickel Thin Film

2010 ◽  
Vol 437 ◽  
pp. 580-583
Author(s):  
Ho Chang ◽  
Yun Min Yeh ◽  
Ching Song Jwo ◽  
Sih Li Chen
Keyword(s):  
Carbon Fiber ◽  
Average Particle Size ◽  
Composite Films ◽  
Waterborne Polyurethane ◽  
Electromagnetic Shielding ◽  
Average Particle ◽  
Shielding Effectiveness ◽  
Conductive Composite ◽  
Blending Method ◽  
Electromagnetic Shielding Effectiveness

This paper presents the development of a conductive composite film and the measurement of electromagnetic (EM) shielding effectiveness (SE) of the prepared film. A coaxial transmission-line technique based on ASTM D4935-99 Standard was used to measure the electromagnetic shielding effectiveness. A nickel nanofluid with an average particle size of 50 nm was prepared with a self-developed nanofluid synthesis system. By using a polymer blending method, carbon fiber and carbon fiber/nickel nanoparticles were blended with waterborne polyurethane (WPU) to prepare conductive composite films of 0.25 mm thick. Experimental results have shown that the electromagnetic shielding effectiveness value of the prepared conductive composite material can reach 26 dB within the range of 50 MHz ~ 1.5GHz.

Electromagnetic Shielding Effectiveness and Manufacturing Technique of Metal Complex Fabrics

2014 ◽  
Vol 496-500 ◽  
pp. 472-475
Author(s):  
Ching Wen Lou ◽  
An Pang Chen ◽  
Ting An Lin ◽  
Ya Yuan Chuang ◽  
Jia Horng Lin
Keyword(s):  
Metal Complex ◽  
Life Time ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Test Results ◽  
Test Frequency ◽  
Shielding Effectiveness ◽  
Conductive Composite ◽  
Composite Yarn ◽  
Electromagnetic Shielding Effectiveness

In the research, The electromagnetic interferences (EMI) have drastically increased and can disrupt and reduce the life time and the efficiency of devices. Therefore, the electromagnetic shielding problem is become the important issue. In the research, Ni wire and Cu wire (Floodlit Enterprise Co., Ltd.) were used to make the Ni conductive composite yarn and Cu conductive composite yarn via an electrical covering machine. And the Cu conductive composite yarn was fabricated to the woven fabrics with the plain weaving. The test results revealed that the EMSE of the W/K/W complex fabrics have stable EMSE than the W/W/W complex fabrics when the laminated at the same direction. The W/90W/W complex woven fabrics were shown the best EMSE of 46.25 dB, which the test frequency is 1800 MHz.

scholarly journals Electromagnetic wave shielding and mechanical properties of vapor-grown carbon nanofiber/polyvinylidene fluoride composite fibers

2020 ◽  
Vol 15 ◽  
pp. 155892502098595
Author(s):  
Metin Yuksek
Keyword(s):  
Tensile Strength ◽  
Carbon Nanofibers ◽  
Polyvinylidene Fluoride ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Woven Fabric ◽  
Shielding Effectiveness ◽  
Composite Fibers ◽  
Conductive Composite ◽  
Electromagnetic Shielding Effectiveness

The demand for multifunctional requirements in aerospace, military, automobile, sports, and energy applications has encouraged the investigation of new conductive composite fibers. This study focuses on the development of Vapor-grown carbon nanofibers (VGCNFs) filled Polyvinylidene Fluoride (PVDF) composite fibers. Polyvinylidene fluoride (PVDF) reinforced with (1, 3, 5, and 8 wt.%) carbon nanofibers were produced as a masterbatch. The production of PVDF and PVDF/CNF composite fibers have been done successfully by using melt spinning processing technique. Conductive woven fabrics were produced with composite fibers on handloom machines to measure electromagnetic interference (EMI) shielding efficiency. Tensile strength of fibers increased with increase in CNF loading up to 3%. The tensile strength displayed a decrease of 5% and 8% CNF loading. Electromagnetic shielding effectiveness (EMSE) of woven fabrics with composite fibers were tested by using the coaxial transmission line method for planar materials standard that is based on ASTM D 4935-10. The electromagnetic shielding effectiveness of woven fabric which is consist of conductive composite fibers were increased with increasing CNFs loading and amount of fabric layers. It can be seen that the woven fabrics displayed between 2–10 dB and 2–4 dB EMSE values in the 15–600 MHz and 600–3000 MHz-frequency range, respectively. Nevertheless, it was observed that conductive filler content, dispersion, and network formation within the composite fibers were highly influent on the electromagnetic shielding effectiveness performance of the structures.

scholarly journals Electrical Conductivity and Electromagnetic Shielding Effectiveness of Bio-Composites

2020 ◽  
Vol 4 (1) ◽  
pp. 28
Author(s):  
Konstantinos Tserpes ◽  
Vasileios Tzatzadakis ◽  
Jens Bachmann
Keyword(s):  
Electrical Conductivity ◽  
Carbon Fiber ◽  
Epoxy Resin ◽  
Numerical Models ◽  
Experimental Testing ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Carbon Fiber Fabric ◽  
Electromagnetic Shielding Effectiveness ◽  
Fiber Fabric

In this paper, the electrical conductivity and electromagnetic shielding effectiveness of two bio-composites are studied by experimental testing and numerical models. Two monolithic composites with partly bio-based content were manufactured. The first bio-composite is made of a carbon fiber fabric prepreg and a partly bio-based (rosin) epoxy resin (CF/Rosin). The second bio-composite is a combination of prepregs of carbon fiber fabric/epoxy resin and flax fiber fabric/epoxy resin (CF-Flax/Epoxy). A single line infusion process was used prior to the curing step in the autoclave. Both variants are exemplary for the possibility of introducing bio-based materials in high performance CFRP. In-plane and out-of-plane electrical conductivity tests were conducted according to Airbus standards AITM2 0064 and AITM2 0065, respectively. Electromagnetic shielding effectiveness tests were conducted based on the standard ASTM D 4935-10. Materials were prepared at the German Aerospace Center (DLR), while characterization tests were conducted at the University of Patras. In addition to the tests, numerical models of representative volume elements were developed, using the DIGIMAT software, to predict the electrical conductivity of the two bio-composites. The preliminary numerical results show a good agreement with the experimental results.

Electromagnetic Shielding Effectiveness of Carbon Black -Carbon Fiber Cement Based Materials

2010 ◽  
Vol 168-170 ◽  
pp. 1438-1442 ◽  
Author(s):  
Shao Wen Huang ◽  
Guang Hua Chen ◽  
Qi Luo ◽  
Yu Hua Xu
Keyword(s):  
Carbon Fiber ◽  
Carbon Black ◽  
Mass Fraction ◽  
Electromagnetic Shielding ◽  
Cement Composites ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Cement Based Materials ◽  
Electromagnetic Shielding Effectiveness ◽  
Effective Additive

The electromagnetic shielding effectiveness (SE) of cement based composites filled with carbon black and carbon fiber were discussed in this paper. Results show the SE of cement composites will get obvious improvement as the carbon black mass fraction increases beyond 6%. Carbon fiber is a much more effective additive than carbon back. The shielding effectiveness were gradually improved with the increase of content of carbon fiber, the maximum attained 21 dB at 1.5GHz. Adding carbon black and carbon fiber, SE of the cement based materials get more upward gradient, the maximum SE reached 27 dB in tested frequency range.

Telecommunication Evaluation of Conductive Composite Plates

2011 ◽  
Vol 239-242 ◽  
pp. 1972-1975
Author(s):  
Jia Horng Lin ◽  
Ching Wen Lin ◽  
Chien Teng Hsieh ◽  
Chi Yu Chen ◽  
Po Ching Lu ◽  
...  
Keyword(s):  
Composite Plates ◽  
Alternating Current ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Load Current ◽  
Conductive Composite ◽  
Electromagnetic Shielding Effectiveness ◽  
Zigzag Shape

Two identical zigzag-shapes and an aluminum zigzag shape foil were combined as a slice testing piece. Each of the pieces was connected with AC. 110 V and AC. 12 V. The result indicated that the piece, whose tooth was 10mm wide with intervals of 15 mm, displayed an electromagnetic shielding effectiveness (EMSE) of 30 mG with the load current of AC. 110 V. The EMSE of another piece, whose teeth wide was 5 mm with intervals of 10 mm, was 20 mG in the load current of AC. 12 V. This result proved that samples were with EMSE under the alternating current.

Preparation of CF/BR Composite Used for Electromagnetic Shielding

2008 ◽  
Vol 47-50 ◽  
pp. 980-983
Author(s):  
Yi He Zhang ◽  
Jin Bo Lu ◽  
Hai Tao Huang ◽  
Xiang Yang Hao ◽  
Helen Lai Wah Chan
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Electromagnetic Shielding ◽  
Experimental Results ◽  
Butadiene Rubber ◽  
Shielding Effectiveness ◽  
Mechanical Agitation ◽  
Electromagnetic Shielding Effectiveness

The carbon fiber (CF) reinforced butadiene rubber (BR) electromagnetic shielding composite has been prepared by mechanical agitation and roll mixing methods. The composites have been characterized and tested. As shown in the experimental results, the mechanical properties was increased with the increase of CF, and the electromagnetic shielding effectiveness (SE) of BR based composite with 15 wt% CF content has been tested, the maximum SE was about 60 dB.

Sign in / Sign up

Export Citation Format

Share Document