The electromagnetic response of composition-regulated honeycomb structural materials used for broadband microwave absorption

Pang, Huifang; Duan, Yuping; Dai, Xuhao; Huang, Lingxi; Yang, Xuan; Zhang, Tuo; Liu, Xiaoji

doi:10.1016/j.jmst.2021.01.072

Cited by 72 publications

(20 citation statements)

References 31 publications

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“…Presently, the main preparation methods of EM attenuation materials with honeycomb structures involve two elements: one is the preparation of carbon materials, and the other is the construction of honeycomb core structures. The prepared carbon materials dispersed in the impregnation liquid base material are subsequently coated on the honeycomb structural surface. − However, this method has at least five disadvantages: The traditional approach is extremely time-consuming, often requiring days to complete because of the low-efficiency fabrication steps involved, such as carbon-based nanofiber/graphene/graphite/nanotube fabrication, adhesive curing and drying, and material stretching, setting, and cutting, with complex processes and long cycles. The preparations of graphene, graphite, carbon nanotubes, or carbon fiber involve complex multistep fabrication processes and suffer from relatively high cost and energy consumption as well as the usage of toxic chemicals An interface between the carbon-containing coating and the honeycomb core structure is ineluctable.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Carbon Superstructures for Efficient Electromagnetic Shielding

Sun

Lou

Lei

et al. 2023

ACS Appl. Mater. Interfaces

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Biologically inspired superstructural materials exhibit wide application prospects in many fields, in terms of mitigating increasingly serious electromagnetic (EM) pollution in the civil field. Here, we successfully obtain bamboo slices with uniform pore size distribution through the advanced bamboo transverse splitting technology developed by our group previously and prepare large-scale honeycomb-like carbon-based tubular array (CTA) structures with a controllable pore size, graphitization degree, and selectable conductivity property. Based on the simulation and experimental results, the EM shielding performance of CTAs is proven to be sensitive to the microchannel aperture size and the EM energy incident angle, which is attributed to the difference in the propagation rate of induced electrons in different directions. Among the candidates, CTA-middle-1500 exhibits the best shielding performance against incident EM energy with average SE/ρ values of 123.7 and 144.5 dB cm3 g–1 for perpendicular and parallel directions, respectively, showing its application potential as a lightweight and efficient EM shielding material. The predicted optimal incident angle for CTA-middle-1500 against EM energy radiation is 15°, with the largest RCS reduction value of 26.1 dB m2. The excellent EM shielding performance is attributed to the good reflection capacity involved with the high conductivities of the CTAs.

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Section: Introductionmentioning

confidence: 99%

Bioinspired Carbon Superstructures for Efficient Electromagnetic Shielding

Sun

Lou

Lei

et al. 2023

ACS Appl. Mater. Interfaces

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“…While this brings convenience to people’s lives, it is also accompanied by serious electromagnetic (EM) pollution and EM interference. In the past, a large number of EM absorbers targeting the gigahertz (GHz) frequency band are developed to convert EM wave into heat energy. − Actually, most civilian electronic equipment, wireless communication, and military phased array radar work in the megahertz (MHz) frequency band. Moreover, the variable temperature of the service environment and the overheating problem caused by high integration make the EM absorbers usually work in a wide temperature range (from −50 to 150 °C).…”

Section: Introductionmentioning

confidence: 99%

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Liu

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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Electromagnetic (EM) absorbers serving in the megahertz (MHz) band and a wide temperature range (from −50 to 150 °C) require high and temperature-stable permeability for outstanding EM absorption performance. Herein, FeCoNiCr0.4Cu X high-entropy alloy (HEA) powders with a unique nanocrystalline structure separated by a thin amorphous layer (NTA) are designed to improve permeability and enhance intergranular coupling. Simultaneously, the long-range anisotropy is introduced via devising the preparation process and tuning the chemical composition, such that the intergranular exchange interaction is further strengthened for stable permeability and EM wave absorption in a wide temperature range. FeCoNiCr0.4Cu0.2 HEAs exhibit a near-zero permeability temperature coefficient (5.7 × 10–7 °C–1) a in wide temperature range. The maximum reflection loss (RL) of FeCoNiCr0.4Cu0.2 HEAs is higher than −7 dB with 5 mm thickness at −50–150 °C, and the absorption bandwidth (RL < −7 dB) can almost cover 400–1000 MHz. Furthermore, FeCoNiCr0.4Cu0.2 HEAs also have a high Curie temperature (770 °C) and distinguished oxidation resistance. The permeability temperature dependence of FeCoNiCr0.4Cu X HEAs is investigated in-depth in light of the microstructural change induced by tuning the chemical composition, and a new inspiration is provided for the design of magnetic applications serving in wide temperature, such as transformers, sensors, and EM absorbers.

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“…Today, most electronic devices still operate in the megahertz (MHz) frequency band. Facing longer wavelengths than gigahertz EMW, absorbers demand larger and more matched complex permittivity and complex permeability to achieve broadband EMW absorption in the MHz band [ 12 – 16 ]. In addition, the harsh service environments bring challenges to the multi-temperature adaptability (at − 50–150 °C) and corrosion resistance of EMW absorbers [ 13 , 17 – 22 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Design of High-Entropy Alloys Through a Multistage Mechanical Alloying Strategy for Temperature-Stable Megahertz Electromagnetic Absorption

et al. 2022

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Developing megahertz (MHz) electromagnetic wave (EMW) absorption materials with broadband absorption, multi-temperature adaptability, and facile preparation method remains a challenge. Herein, nanocrystalline FeCoNiCr0.4Cu0.2 high-entropy alloy powders (HEAs) with both large aspect ratios and thin intergranular amorphous layers are constructed by a multistage mechanical alloying strategy, aiming to achieve excellent and temperature-stable permeability and EMW absorption. A single-phase face-centered cubic structure with good ductility and high crystallinity is obtained as wet milling precursors, via precisely controlling dry milling time. Then, HEAs are flattened to improve aspect ratios by synergistically regulating wet milling time. FeCoNiCr0.4Cu0.2 HEAs with dry milling 20 h and wet milling 5 h (D20) exhibit higher and more stable permeability because of larger aspect ratios and thinner intergranular amorphous layers. The maximum reflection loss (RL) of D20/SiO2 composites is greater than − 7 dB with 5 mm thickness, and EMW absorption bandwidth (RL < − 7 dB) can maintain between 523 and 600 MHz from − 50 to 150 °C. Furthermore, relying on the “cocktail effect” of HEAs, D20 sample also exhibits excellent corrosion resistance and high Curie temperature. This work provides a facile and tunable strategy to design MHz electromagnetic absorbers with temperature stability, broadband, and resistance to harsh environments.

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The electromagnetic response of composition-regulated honeycomb structural materials used for broadband microwave absorption

Cited by 72 publications

References 31 publications

Bioinspired Carbon Superstructures for Efficient Electromagnetic Shielding

Bioinspired Carbon Superstructures for Efficient Electromagnetic Shielding

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Microstructure Design of High-Entropy Alloys Through a Multistage Mechanical Alloying Strategy for Temperature-Stable Megahertz Electromagnetic Absorption

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The electromagnetic response of composition-regulated honeycomb structural materials used for broadband microwave absorption

Cited by 72 publications

References 31 publications

Bioinspired Carbon Superstructures for Efficient Electromagnetic Shielding

Bioinspired Carbon Superstructures for Efficient Electromagnetic Shielding

FeCoNiCr0.4CuX High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum

Microstructure Design of High-Entropy Alloys Through a Multistage Mechanical Alloying Strategy for Temperature-Stable Megahertz Electromagnetic Absorption

Contact Info

Product

Resources

About

FeCoNiCr_0.4Cu_X High-Entropy Alloys with Strong Intergranular Magnetic Coupling for Stable Megahertz Electromagnetic Absorption in a Wide Temperature Spectrum