A comparative study on the microwave absorption properties of core-single-shell, core-double-shell and yolk-shell CIP/ceramic composite microparticles

Xu, Zhigang; Du, Jingheng; Wang, Jūn; Chen, Zhihong; Li, Wenjun; Wang, Chuanbin; Shen, Qiang

doi:10.1016/j.jmmm.2021.168959

Cited by 15 publications

(3 citation statements)

References 70 publications

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“…As shown in Figure 5 (g, h), compared with other nanomaterial absorbers of similar structure, the double-shell hollow sphere absorber prepared in this work simultaneously meets the indicators of thin thickness, high RL, and wide effective absorption bandwidth, and has excellent comprehensive absorbing performance. [74][75][76][77][78][79][80][81][82][83][84][85][86][87] To further reveal the microwave absorption mechanism of MoC 1-x /C-TCN, the quarter-wavelength matching theory was introduced to further study the correlation between RL and the matching thickness of the absorber. Its calculation formula is as follows: [88][89][90]…”

Section: Resultsmentioning

confidence: 99%

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Zhao

Jia

Zhang

et al. 2022

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118

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EMW radiation will interfere with the normal operation of digital equipment and electronic components, and it is difficult to guarantee people's information security. [4,5] More seriously, studies have shown that EMW can interfere with the inherent magnetic field of the human body, increasing the risk of skin diseases, heart disease, cancer, and other diseases, and pose a great threat to health. [6][7][8][9] Therefore, it is urgent to develop advanced and efficient absorbing materials. [10] The absorption behavior of high-performance EMW absorbing materials depends heavily on the electromagnetic parameters and impedance-matching properties. [11,12] In turn, they are closely related to the size, microstructure, composition, and geometry of the material. [13][14][15] However, in addition to the inherent magnetic and dielectric properties, the material itself will affect the impedance-matching characteristics of the material. In order to improve the electromagnetic absorption property, the reasonable design and construction of absorbing materials with special microstructure are also very important for the attenuation of EMW. It is generally believed that the properties of materials are highly related to the nanostructures of materials. [16] Therefore, researchers have made great efforts to design and regulate materials with special structures. such as arranged structures, porous structures, hollow structures, and core-shell structures, in which especially hollow and porous structures with low density and large hollow interfaces have aroused the interest of researchers. [17][18][19] In absorbing materials, the design of voids or shells can efficiently decrease the density of materials for lightweight purposes, and the impedancematching characteristics can be adjusted by reducing the complex permittivity. The existence of this internal void also gives it multiple reflections and scattering effects, which is conducive to prolonging the propagation path of EMWs to enhance attenuation. [20][21][22] As a typical class of dielectric loss materials, carbides have been highly sought after by researchers because of their various remarkable advantages such as good thermal stability, high mechanical strength, and high resistance to oxidation and corrosion. [23][24][25][26][27][28][29] Especially in the field of EMW absorption, researchers have used the semiconducting nature of carbide to regulate the dielectric constant of carbon materials by compounding with carbon materials to effectively regulate the In order to achieve excellent electromagnetic wave (EMW) absorption properties, the microstructure design and component control of the absorber are critical. In this study, three different structures made of Mo 2 C/C hollow spheres are prepared and their microwave absorption behavior is investigated. The Mo 2 C/C double-shell hollow spheres consisting of an outer thin shell and an inner rough thick shell with multiple EMW loss mechanisms exhibit good microwave absorption properties. In order to further improve the microwave abso...

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Section: Resultsmentioning

confidence: 99%

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Zhao

Jia

Zhang

et al. 2022

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118

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“…When the Co/Fe ratio was 2: 3, the reflection loss at 15.1 GHz reached -38.7 dB, featuring an effective absorption bandwidth of 6.9 GHz and a sample thickness of 2 mm. Although iron-based amorphous alloys have excellent magnetic loss capabilities, their dielectric loss capabilities are weaker [27,28] . Moreover, the effective absorption bandwidth is narrow, and the matching thickness is relatively large [29][30][31] , which is not conducive to meeting the requirements of "thin, light, wide, and strong" development.…”

Section: Introductionmentioning

confidence: 99%

Ball milling modification impact on the electromagnetic wave absorption properties of Fe83.3Si4B7P4Cu0.7Co1 amorphous powder

Jia,

Zhou,

Liu

et al. 2024

International Conference on Optoelectronic Information and Functional Materials (OIFM 2024)

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The enhanced broadband absorption and optimized impedance matching were of significant importance for achieving "thin, light, wide, and strong" in absorber materials. In this study, Fe83.3Si4B7P4Cu0.7Co1 amorphous alloy powders were prepared using vacuum air atomization method. The powders were mechanically crushed via high-energy ball milling, and the microstructure, morphology, and absorption properties of the materials were characterized. The results show that the loss mechanism of Fe83.3Si4B7P4Cu0.7Co1amorphous alloy powders is primarily magnetic loss, including eddy current loss and natural resonance. The flattening of the powders not only increases anisotropy and optimizes impedance matching but also enhances the complex permittivity and permeability, endowing the material with excellent bandwidth effects and electromagnetic wave loss capability. The maximum effective absorption bandwidth (ΔfRL<-10 dB) of the sample ball-milled for 6 hours can reache 8.29 GHz (9.71 GHz ~18 GHz), with the minimum reflection loss(RLmin) at 13.2 GHz being -41.73 dB and a sample thickness of 2 mm. This indicates that the material has good absorbing performance and exceptional bandwidth capabilities in the mid to high-frequency range, covering part of the X-band and the entire Ku-band, offering greater flexibility and applicability in practical applications.

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“…To improve the oxidation resistance of magnetic metallic absorbents, surface coating has been employed as the main method to reduce or avoid oxygen-metal interface reactions [19]. Organics, inorganic compounds, metals and alloys have been reported as coating materials for magnetic metallic absorbents to isolate the contact between absorbents and oxygen [20,21]. Organic coating materials such as polyaniline are compatible with polymer matrices, and their redox properties can induce the stable passivation of Fe [21,22].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Property Modulation of Flaky Ferromagnetic 304 Stainless-Steel Powders for Microwave Absorption at Elevated Temperatures

Yang,

Xu,

Chen

et al. 2023

Magnetochemistry

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Soft magnetic metallic absorbents suffer from severe oxidation, reduction in permeability and deterioration in microwave absorption when exposed to high temperatures. In this study, we prepared flaky 304 stainless-steel powders as new microwave absorbents via deformation-induced ferromagnetism. The 304 stainless-steel powders showed significant increases in saturation magnetization (Ms) from 1.03 to 82.46 emu/g when their shape was changed from spheroids to flakes; the Ms further increased to 92.29 emu/g after heat treatment at 500 °C in air. The permeability of 304 alloy powders also showed an obvious increase after ball milling and remained roughly stable after heat treatment at 500 °C in air. Moreover, the permittivity exhibited a sharp decrease after heat treatment, enabling the improvement of impedance matching and microwave absorption. After heat treatment at 500 °C in air for 100 h, the simulated reflection loss of 304 stainless-steel powders with wax still showed attractive levels, giving a minimum value of −22 dB and remaining below −6 dB over 8.5–16.5 GHz at a thickness of 2 mm. Our work can help to include paramagnetic alloy systems as new microwave absorbents for working in harsh environments.

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A comparative study on the microwave absorption properties of core-single-shell, core-double-shell and yolk-shell CIP/ceramic composite microparticles

Cited by 15 publications

References 70 publications

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Ball milling modification impact on the electromagnetic wave absorption properties of Fe83.3Si4B7P4Cu0.7Co1 amorphous powder

Electromagnetic Property Modulation of Flaky Ferromagnetic 304 Stainless-Steel Powders for Microwave Absorption at Elevated Temperatures

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