Surface Coatings Based on Carbon Paper and its Electromagnetic Shielding Property

2011 ◽  
Vol 236-238 ◽  
pp. 1261-1264
Author(s):  
Zhi Jun Hu ◽  
Jiang Lin ◽  
Jing An Yu
Keyword(s):  
Carbon Fiber ◽  
Coating Layer ◽  
Magnetic Loss ◽  
Interaction Mechanism ◽  
Electromagnetic Shielding ◽  
Carbon Paper ◽  
Shielding Effectiveness ◽  
Coating Method ◽  
Carbon Fiber Paper ◽  
Conductive Properties

Carbon fiber paper was coated with multiple layers coating composed by conductive and magnetic fillers. The electromagnetic shielding and conductive properties of the coating were investigated. The effluencing factors such as the ratio of conductive and magnetic fillers, the composition of magnetic fillers, the contrast of coating method, the structure of shielding layer were assessed according with effectiveness. The results showed the best component for the coating layer was: conductive substrate, conductive coating layer and magnetic coating layer sequently. The compound of magnetic fillers with differenet electromagnetic interaction mechanism would produce a complementary magnetic loss, and display a high absorption in broader frequency band. The shielding effectiveness of multi-layer coated carbon fiber paper at 1.5 GHz was shown up to 45 dB.

scholarly journals Process and Structure of Electromagnetic Shielding Plywood Composite Laminated with Carbon Fiber Paper

2014 ◽  
Vol 8 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Quanping Yuan ◽  
Keyang Lu ◽  
Feng Fu
Keyword(s):  
Carbon Fiber ◽  
Three Dimensional ◽  
Single Layer ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Hot Press ◽  
Wood Veneer ◽  
Carbon Fiber Paper ◽  
Shielding Material ◽  
Better Than

Carbon fiber paper (CFP), a type of flexible planer electromagnetic shielding material with thin thickness, low density, and good adhesion property and permeability, was laminated with wood veneer to produce a plywood composite with good shielding effectiveness (SE). It was found that a hot-press pressure of 1.2 MPa and a double-sized adhesive concentration of 380 g/m2 were most appropriate for the production of CFP plywood composites. SE of plywood composite laminated with single layer CFP was better than that before hot pressed, which result from the formation of three-dimensional and smaller conductive carbon fiber circuitries. The space between two-layer CFPs and the thickness of the surface-layer veneer had significant influence on SE. The SE of the composites laminated with two-layer CFPs was significantly higher than those with one-layer CFPs. The SE in the frequency range of 30 MHz to 1 GHz reached above 30 dB depending on the space between two-layer CFPs and the thickness of the surface veneer, which was sufficient SE for commercialization and the use of plywood composites.

Low-temperature fabrication of crystalline MnCoO spinel film on porous carbon paper for efficient oxygen evolution reaction

2021 ◽  
Author(s):  
Sunglun Kwon ◽  
Ha Eun Lee ◽  
Donghoon Han ◽  
Jong Hyeon Lee
Keyword(s):  
Thin Film ◽  
Carbon Fiber ◽  
Low Temperature ◽  
Oxygen Evolution ◽  
Porous Carbon ◽  
Oxygen Evolution Reaction ◽  
Carbon Paper ◽  
Carbon Fiber Paper

A thin film of MnxCo3−xO4 (MnCoO) nanocatalyst on a porous carbon fiber paper (CFP) electrode for efficient oxygen evolution reaction (OER).

scholarly journals The Preparation and Research on the Electromagnetic Shielding Effectiveness of T-ZnO@Ag/Silicone Rubber Composites

2019 ◽  
Vol 26 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Jingkai NIE ◽  
Guangke WANG ◽  
Dong HOU ◽  
Fu GUO ◽  
Yu HAN
Keyword(s):  
Coating Layer ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Rubber Composites ◽  
Chemical Plating ◽  
Agno3 Solution ◽  
Rubber Composite ◽  
The Matrix ◽  
Micro Structures ◽  
Electromagnetic Shielding Effectiveness

This study first conducted surface modification of Ag-plated Tetrapod-like zinc oxide (T-ZnO) whiskers with the use of dopamine and prepared Ag-plated T-ZnO whiskers (T-ZnO@Ag) by means of chemical plating, in which AgNO3 solutions with different concentrations were used during the preparation. Micro-structures of the prepared T-ZnO@Ag powders were examined to evaluate the effect of AgNO3 concentration on Ag plating performance. Subsequently, conductive Si rubber samples were prepared, the T-ZnO@Ag powders were used as fillers, and the effectiveness of the related electromagnetic shielding was investigated in detail. The results showed that using AgNO3 solution with a concentration of 20 g/L, a continuous Ag coating-layer was observed on the surface of T-ZnO whiskers. It was evident that, when used as fillers, T-ZnO@Ag has a conductive threshold and when the mass fraction of the fillers exceeded 50 %, the T-ZnO@Ag whiskers that were uniformly dispersed in the matrix formed interconnected conductive paths. In this condition, the electromagnetic shielding effectiveness of the prepared T-ZnO@Ag/Si rubber composite reached up 90 dB.

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.

Simulation and experimentation of wide frequency electromagnetic shielding coating used for carbon fiber composite materials of track vehicles

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940020 ◽  
Author(s):  
Ming Gong ◽  
Shou-Guang Sun ◽  
Lin Sun ◽  
Ai-Qin Tian ◽  
Qiang Li
Keyword(s):  
Computer Simulation ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Simulation Technology ◽  
Carbon Fiber Composite ◽  
Fiber Composite Materials

Computer Simulation Technology EM and Computer Simulation Technology Microwave Studio electromagnetic simulation software were used to simulate the carbon fiber composite materials with a new type of wide frequency electromagnetic shielding coating. DC magnetic field, low-frequency electromagnetic fields, and mid-high frequency electromagnetic shielding effectiveness analysis model were established in order to study the influence of permeability, conductivity, coating thickness and other parameters in the typical frequency range research on the shielding effectiveness. The results show that the composite coating material with reasonable design can effectively enhance the electromagnetic shielding performance of carbon fiber composite materials in the DC [Formula: see text]18 GHz frequency range.

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.

Exceptional electromagnetic shielding efficiency of silver coated carbon fiber fabrics via a roll-to-roll spray coating process

2020 ◽  
Vol 8 (32) ◽  
pp. 11070-11078 ◽  
Author(s):  
Janghoon Park ◽  
Xiyu Hu ◽  
Mahsa Torfeh ◽  
Uzodinma Okoroanyanwu ◽  
Amir Arbabi ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Spray Coating ◽  
Electromagnetic Shielding ◽  
Coating Process ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Roll To Roll ◽  
Coated Carbon

The continuous and scalable fabrication of silver coated carbon fiber fabrics with exceptional EMI shielding effectiveness via a roll-to-roll spray coating process.

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