scholarly journals Electromagnetic Interference Shielding Anisotropy of Unidirectional CFRP Composites

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1907
Author(s):  
Jun Hong ◽  
Ping Xu
Keyword(s):  
Carbon Fiber ◽  
Electromagnetic Interference ◽  
Fiber Orientation ◽  
Free Space ◽  
Theoretical Formula ◽  
Emi Shielding ◽  
Cfrp Composites ◽  
Set Up ◽  
Electromagnetic Pollution ◽  
Space Measurement

Carbon fiber-reinforced polymer (CFRP) composites have excellent mechanical properties and electromagnetic interference (EMI) shielding performance. Recently, their EMI shielding performance has also attracted great attention in many industrial fields to resolve electromagnetic pollution. The present paper mainly investigated the EMI shielding anisotropy of CFRP materials using a specified set-up of free-space measurement. The electrical conductivity of unidirectional CFRP composites was identified to vary with the fiber orientation angles, and the formula was proposed to predict the results consistent with the experimental. The obvious EMI shielding anisotropy of unidirectional CFRP composites was clarified by free-space measurement. The theoretical formula can predict the EMI shielding value at different carbon fiber orientation angles, and the predicted results were highly consistent with the experimental results. A comparison of the free-space measurement and the coaxial transmission line method was also conducted, which indicated that special attention should be paid to the influence of the anisotropy of CFRP composites on the shielding results. With those results, the mechanism of EMI shielding anisotropy of CFRP composites is clarified, which will provide an effective design of EMI shielding products with a designable shielding direction and frequency.

Polarization selection characteristics of carbon fiber orientation and interweaving for electromagnetic interference shielding behaviors

2021 ◽  
pp. 004051752110342
Author(s):  
Xinghua Hong ◽  
Lulu Zhong ◽  
Junmin Wan ◽  
Yongqiang Li ◽  
Fuwang Guan ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Electromagnetic Interference ◽  
Fiber Orientation ◽  
Cost Effective ◽  
Transverse Magnetic ◽  
Woven Fabrics ◽  
Electromagnetic Properties ◽  
Emi Shielding ◽  
Spatially Distributed ◽  
The Impact

In this paper, to determine the impact of carbon fiber orientation and interweaving on electromagnetic interference (EMI) shielding behaviors, anisotropic and isotropic samples were developed by conductive/dielectric weaving of spatially distributed carbon fiber and glass fiber. Effortless and cost-effective, the electromagnetic shielding efficiency (SE) was up to 42 dB and the SE/thickness) was 41 dB/mm, which had apparent polarization selection characteristics. In addition, the angle (θ) sensitivity for the SE in transverse electric and transverse magnetic polarization modes was given in detail. SE was generally proportional to θ. Moreover, the fingerprint-like radar chart of anisotropic carbon hybrid woven fabrics in the X-band was performed, which makes polarization selection characteristics more intuitive. This paper presented an easy and effective route for assembling hybrid carbon fiber fabrics with high EMI shielding performance, which offers a clear perspective on the simulation and study of carbon fiber electromagnetic properties.

Interface design of carbon filler/polymer composites for electromagnetic interference shielding

2021 ◽  
Author(s):  
Runxiao Chen ◽  
Rongrong Yu ◽  
Xiaoyuan Pei ◽  
Wei Wang ◽  
Diansen Li ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Interface Design ◽  
Electrical Equipment ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Carbon Filler ◽  
Portable Electronics ◽  
Electromagnetic Pollution ◽  
Carbon Based

The extensive use of electrical equipment and portable electronics has aroused major concerns about electromagnetic pollution. Carbon-based polymer composites are widely used in the electromagnetic interference (EMI) shielding field, motivated...

Cobaltosic oxide fiber/Carbon Fiber composites fabricated by hydrothermal for improved electromagnetic interference shielding properties

2019 ◽  
Vol 33 (09) ◽  
pp. 1950075
Author(s):  
Ming Gong ◽  
Qiang Li ◽  
Lin Sun ◽  
Ai-Qin Tian ◽  
Shou-Guang Sun
Keyword(s):  
Carbon Fiber ◽  
Electromagnetic Interference ◽  
Fiber Composites ◽  
Interface Strength ◽  
Carbon Fiber Composites ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Calcination Step ◽  
Cobaltosic Oxide ◽  
Shielding Properties

In this paper, a newly designed composite of magnetic nano-Co3O4 fiber coated on carbon fiber (Cf) is prepared and characterized for the electromagnetic interference (EMI) shielding properties. XRD, SEM and TEM are used to investigate the micromorphology and microstructure evolution during the preparation. By hydrothermal method, the flowerlike clusters of single crystal flake-Co(OH)2 are first obtained on Cf. The firstly prepared Co(OH)2 sheets then turn into Co3O4 fibers during the next calcination step. The continuous and loose coating of magnetic Co3O4 nanofibers is finally obtained on the Cf. The loose coating is in proportion to the weight loss, and the wirelike Co3O4 is good for the interface strength for the Cf composite preparation. Based on the above work, the loose magnetic fibers coating on the Cf could be a feasible composite structure for the EMI composite materials integrated with absorbing and reflecting.

Preparation and Characterization of Conductive Filler Used for Electromagnetic Shielding Materials

2014 ◽  
Vol 492 ◽  
pp. 268-272 ◽  
Author(s):  
Rui Wang ◽  
Hui Yang ◽  
Jing Ling Wang ◽  
Zong Qing Ma ◽  
Feng Xiu Li
Keyword(s):  
Carbon Fiber ◽  
Saturation Magnetization ◽  
Electromagnetic Interference ◽  
Composite Coatings ◽  
Conductive Filler ◽  
Electromagnetic Shielding ◽  
Vibrating Sample Magnetometer ◽  
Emi Shielding ◽  
Microstructure Observation

In present work, two conductive filler (carbon fiber with Nickel (Ni) coatings and carbon fiber with Nickel/Fe3O4 nanoparticle (Ni/Fe3O4-NPs) composite coatings) were prepared by electrodeposition. Microstructure observation indicated that the coatings were deposited uniformly on the surface of fiber. Vibrating sample magnetometer (VSM) and electromagnetic interference (EMI) shielding test showed that the two conductive filler has good saturation magnetization and EMI shielding effectiveness.The conductive filler of carbon fiber with Ni/Fe3O4-NPs composite coatings was more excellent. They are promising for application in electromagnetic shielding materials.

Ultrathin graphene: electrical properties and highly efficient electromagnetic interference shielding

2015 ◽  
Vol 3 (26) ◽  
pp. 6589-6599 ◽  
Author(s):  
Mao-Sheng Cao ◽  
Xi-Xi Wang ◽  
Wen-Qiang Cao ◽  
Jie Yuan
Keyword(s):  
Electrical Properties ◽  
Information Security ◽  
Rapid Growth ◽  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Electronic Devices ◽  
Strong Absorption ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Electromagnetic Pollution

Ultrathin graphene, a 2D material, demonstrates outstanding features and rapid growth for EMI shielding due to its strong absorption towards electromagnetic waves in composites. It is sought after for communication, electronic devices, information security, electromagnetic pollution defense and healthcare.

Laminate Orientation Effect on Drilling of Carbon Fiber Reinforced Plastic Composites

2013 ◽  
Vol 315 ◽  
pp. 768-772
Author(s):  
Ismail Mahamad Hakimi ◽  
S. Sharif ◽  
Denni Kurniawan
Keyword(s):  
Carbon Fiber ◽  
Fiber Orientation ◽  
Thrust Force ◽  
Machining Process ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Cfrp Composites ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced plastic (CFRP) composites are often used in combination with other materials, requiring it to be machined during fabrication of a structure. Drilling as the most common machining process of CFRP is complex often results in delamination of the composites. The complexity is contributed by CFRP composites fiber orientation which can be of unidirectional or quasi-isotropic type depending on the applications. This study reviews the machinability of CFRP composites by considering fiber orientation and machining conditions used during drilling. Their relation with machining thrust force which leads to delamination is the central theme. An insight in obtaining delamination-free holes is also discussed.

Ultrahigh electromagnetic interference shielding performance of lightweight, flexible, and highly conductive copper-clad carbon fiber nonwoven fabrics

2017 ◽  
Vol 5 (31) ◽  
pp. 7853-7861 ◽  
Author(s):  
Jinpyo Lee ◽  
Yanan Liu ◽  
Yang Liu ◽  
Soo-Jin Park ◽  
Mira Park ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Electromagnetic Interference ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Nonwoven Fabrics

Lightweight, flexible, and highly conductive Cu-clad carbon fiber nonwoven fabrics were developed as superior EMI shielding materialsviafacile and controllable wet-laid and electroless technologies.

Preparation and properties of graphene aerogel/cotton composite flexible fabric with electromagnetic interference (EMI) shielding function

2021 ◽  
pp. 152808372198927
Author(s):  
Peng Wang ◽  
Shuqiang Liu ◽  
Man Zhang ◽  
Gaihong Wu ◽  
Kaiwen Wang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Waterborne Polyurethane ◽  
Development Trend ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Graphene Aerogel ◽  
Emi Shielding Effectiveness ◽  
Aerogel Composite ◽  
Electromagnetic Pollution

In order to alleviate the problems caused by electromagnetic pollution and simultaneously adapt to the future development trend of flexible wearable electronic equipment, it is high time to focus on the research of light weight, flexible and efficient electromagnetic interference (EMI) shielding material. A graphene aerogel composite EMI shielding composite fabric was prepared by combining graphene aerogel with fabric through the connection of waterborne polyurethane. The influence of aerogel amount on the EMI shielding function of fabric was discussed, and the waterborne polyurethane dosage on fabric mechanics and fabric style was also investigated. The result shows the composite fabric EMI shielding effectiveness reached 28 dB when the graphene aerogel amount was 25 mL (only 0.066 mL/cm2), which has satisfied the civilian requirements (20 dB). A good adhesion fastness between graphene and cotton fabric was obtained and the mechanical strength was also improved when the content of waterborne polyurethane was 20 mL. Graphene aerogel electromagnetic shielding composite fabric with good electromagnetic shielding performance and less consumption of nano carbon materials will have a good industrial application prospect.

Artificial Surfaces and Media for Electromagnetic Absorption and Interference Shielding

2021 ◽  
Author(s):  
Pai-Yen Chen ◽  
Mohamed Farhat ◽  
Zhilu Ye ◽  
Muhammad Amin ◽  
Hakan Bagci ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Recent Progress ◽  
Performance Comparison ◽  
Emi Shielding ◽  
Low Profile ◽  
Artificial Surfaces ◽  
Negative Impacts ◽  
And Performance ◽  
Electromagnetic Pollution

The rapid advent of radio-frequency (RF) and microwave technologies and systems have given rise to serious electromagnetic pollution, interference and jamming for high-precision detection devices, and even threats to human health. To mitigate these negative impacts, electromagnetic interference (EMI) shielding materials and structures have been widely deployed to isolate sophisticated instruments or human settlements from potential EMI sources growing every day. We discuss recent advances in lightweight, low-profile electromagnetic absorbing media, such as metamaterials, metasurfaces, and nanomaterial-based solutions, which may provide a relatively easy solution for EMI shielding and suppressing unwanted RF and microwave noises. We present a general review of the recent progress on theories, designs, modeling techniques, fabrication, and performance comparison for these emerging EMI and electromagnetic compatibility (EMC) media.

scholarly journals Recent advances in electromagnetic interference shielding properties of carbon-fibre-reinforced polymer composites—a topical review

2021 ◽  
Author(s):  
E. Mikinka ◽  
M. Siwak
Keyword(s):  
Carbon Fibre ◽  
Electromagnetic Interference ◽  
Reinforced Composites ◽  
Emi Shielding ◽  
Reinforced Polymer ◽  
Cfrp Composites ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Shielding Properties ◽  
Fibre Reinforced Composites

AbstractUsing carbon-fibre-reinforced polymer (CFRP) composites for electromagnetic interference (EMI) shielding has become a rapidly emerging field. This state-of-the-art review summarises all the recent research advancements in the field of electromagnetic shielding properties of CFRP composites, with exclusive attention paid to experimental work. It focuses on (1) important mechanisms and physical phenomena in the shielding process for anisotropic carbon-fibre composites and (2) shielding performance of CFRP materials as reported in the literature, with important performance-affecting parameters. The key properties which directly influence the shielding performance are identified, the most critical being the carbon-fibre concentration along with length for discontinuous carbon-fibre-filled polymers and the lay-up for continuous carbon-fibre-reinforced composites. The effect of adding conductive inclusions such as metal or carbon nanotubes is also reviewed. It is emphasised that processing conditions are strongly linked with the shielding properties of a composite. This is a first review, which covers all the recent advancements in the field of shielding properties of carbon-fibre-reinforced composites, with detailed analysis of factors influencing these properties and clear distinction between continuous and discontinuous reinforcement. It is shown that CFRP composites make a good candidate as an EMI shielding enclosure material.

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