Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Han, Congai; Zhang, Haiyan; Zhang, Danfeng; Deng, Yunfei; Shen, Junyao; Zeng, Guoxun

doi:10.3390/nano10040598

Cited by 27 publications

(13 citation statements)

References 51 publications

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“…From thermogravimetry results, the FeCoCr powders are expected to stay stable at 300 After the proper modulation of permittivity, the reflection loss (RL) of the FeCoCr powders was calculated and discussed. According to the transmission line theory, RL can be calculated by [50,51]…”

Section: Resultsmentioning

confidence: 99%

Deformation-Thermal Co-Induced Ferromagnetism of Austenite Nanocrystalline FeCoCr Powders for Strong Microwave Absorption

Chen

Wang

et al. 2022

Nanomaterials

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Nanocrystalline soft magnetic alloy powders are promising microwave absorbents since they can work at diverse frequencies and are stable in harsh environments. However, when the alloy powders are in austenite phase, they are out of the screen for microwave absorbents due to their paramagnetic nature. In this work, we reported a strategy to enable strong microwave absorption in nanocrystalline austenite FeCoCr powders by deformation-thermal co-induced ferromagnetism via attritor ball milling and subsequent heat treatment. Results showed that significant austenite-to-martensite transformation in the FeCoCr powders was achieved during ball milling, along with the increase in shape anisotropy from spherical to flaky. The saturation magnetization followed parabolic kinetics during ball milling and rose from 1.43 to 109.92 emu/g after milling for 4 h, while it exhibited a rapid increase to 181.58 emu/g after subsequent heat treatment at 500 °C. A considerable increase in complex permeability and hence magnetic loss capability was obtained. With appropriate modulation of complex permittivity, the resultant absorbents showed a reflection loss of below −6 dB over 8~18 GHz at thickness of 1 mm and superior stability at 300 °C. Our strategy can broaden the material selection for microwave absorbents by involving Fe-based austenite alloys and simply recover the ferromagnetism of industrial products made without proper control of the crystalline phase.

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Section: Resultsmentioning

confidence: 99%

Deformation-Thermal Co-Induced Ferromagnetism of Austenite Nanocrystalline FeCoCr Powders for Strong Microwave Absorption

Chen

Wang

et al. 2022

Nanomaterials

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“…This may be due to the interference effect between upper and lower surfaces when the material thickness is large. [ 33 ] Overall, the RL peaks exhibit an obvious trend wherein they shift to a lower frequency band when the thickness of the composite increases (Figure 6). This phenomenon has also occurred in other studies.…”

Section: Resultsmentioning

confidence: 99%

Microwave absorption and bending properties of three‐dimensional gradient honeycomb woven composites

et al. 2022

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To avoid the narrow absorption bandwidth and delamination in uniform honeycomb composites, three-dimensional (3D) gradient honeycomb composites were prepared through a vacuum-assisted resin transfer molding (VARTM) process. The 3D gradient honeycomb woven composite (3D GHWC) was made by using 3D gradient woven fabric with basalt and carbon fibers as reinforcement and epoxy resin mixed with carbon black and carbonyl iron powder as the matrix. For further optimization of the effective absorbing bandwidth and/or reflection loss (RL), especially at a specific incident angle, the type of absorbing agent and gradient honeycomb structure could be altered in the weaving process. The minimum RL value achieved by the 3D GHWC with 18.5-mm thickness is À47 dB in the C band at a 30 incident angle using an Agilent vector network analyzer. In addition, the bending strength of the 3D GHWC with 18.5-mm thickness reaches 101.7 MPa by a universal testing machine, which suggests excellent mechanical properties and ultra-strong environmental adaptability of the 3D GHWC material. This work offers an adjustable method for the fabrication of microwave absorption (MA) composites, showing potential prospects in civilian and military MA applications. K E Y W O R D S3-dimensional reinforcement, carbon fibers, magnetic properties, mechanical properties, vacuum infusion | INTRODUCTIONWireless technology has rapidly developed in the era of the interconnection of all things. The extensive application of smart wearable devices, intelligent electronic products, and fifth-generation (5G) wireless telecommunication have brought abundant convenience via intelligent living but have also caused significant negative impact on human health and device stability due to electromagnetic radiation and electromagnetic interference. [1][2][3] Due to the large thickness, high density, and obvious defects in absorption strength and absorption bandwidth of traditional microwaveabsorbing materials, [4,5] a gradient microwave-absorbing

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“…Moreover, the layered segregated structural polymer composites provided numerous internal reflections and dielectric interfacial dissipation through dielectric and magnetic losses at low conductive filler loading. As depicted in Figure 7, the dielectric loss was induced by both a dipole polarization and an interfacial polarization, 67,68 originating from a large number of interfaces in the composite. In addition, the cell-like structure formed a conducting network, which favored an extended conductance loss.…”

Section: Emi Shielding Mechanismmentioning

confidence: 99%

Regulation binary electromagnetic filler networks in segregated poly(vinylidenefluoride) composite for absorption‐dominated electromagnetic interference shielding

Zhang

Cui

Zhao

et al. 2023

J of Applied Polymer Sci

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Excellent conductivity and optimized impedance matching are vital for superior absorption-dominated electromagnetic interference (EMI) shielding. An efficient binary electromagnetic filler network regulation method has been proposed. Poly-(vinylidenefluoride)-ferroferric oxide-reduced graphene oxide/ single-wall carbon nanotube (PVDF-Fe 3 O 4 -RGC) composite has been synthesized as a layered segregated polymer composite structure by using an electrostatic assembly and hot compression strategy. Binary electromagnetic filler networks have surpassed the obstacles of magnetic materials in conductive networks, and are thereby beneficial for outstanding conductivity and impedance matching. Therefore, a superior conductivity of 1.28 S cm À1 and an outstanding electromagnetic shielding interference and effectiveness of 44.5 dB have been obtained for loading of 2.02 vol.% single-wall carbon nanotubes (SWCNTs), with an absorption rate larger than 85.0% in the X-band. The enhanced EMI shielding performance is attributed to the regulation of the binary electromagnetic filler network.

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Ultrafine FeNi3 Nanocrystals Embedded in 3D Honeycomb-Like Carbon Matrix for High-Performance Microwave Absorption

Cited by 27 publications

References 51 publications

Deformation-Thermal Co-Induced Ferromagnetism of Austenite Nanocrystalline FeCoCr Powders for Strong Microwave Absorption

Deformation-Thermal Co-Induced Ferromagnetism of Austenite Nanocrystalline FeCoCr Powders for Strong Microwave Absorption

Microwave absorption and bending properties of three‐dimensional gradient honeycomb woven composites

Regulation binary electromagnetic filler networks in segregated poly(vinylidenefluoride) composite for absorption‐dominated electromagnetic interference shielding

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