High‐temperature electromagnetic wave absorption properties of Cf/SiCNFs/Si3N4 composites

Zhou, Wei; Li, Yang; Long, Lan; Luo, Hang; Wang, Yichen

doi:10.1111/jace.17389

Cited by 82 publications

(22 citation statements)

References 41 publications

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“…Furthermore, a small linear tail could be observed in all ε ′– ε ″ curves, demonstrating that conductance effect results from the conductive CF. [ 29 ] In addition, it should be noticed that the pristine CF shows a longer tail due to its high conductivity compared with SiCnw/CF composites. [ 52 ] The conductance effect is the mainly reason for conductive loss contributed to dielectric loss.…”

Section: Resultsmentioning

confidence: 99%

“…[11][12][13][14][15][16][17] Generally speaking, magnetic loss-based materials usually include ferromagnetic materials, such as Fe, [6] Co, [9,10,18] Ni, [19][20][21] ferrites, [12,22] or magnetic oxides, [23][24][25][26] whereas the dielectric loss materials usually are related to polarization, including dipole, interface, atomic, and electron polarization. [27][28][29] Conductivity loss mainly results from the conductivity of the materials, such as, carbon-based materials [30][31][32][33][34][35] and conductivity polymers. [5,12,25,36] Unfortunately, ferromagnetic materials were hindered by their poor antioxidation performance and high density.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of SiC Nanowire/Carbon Fiber Composites with Enhanced Electromagnetic Wave Absorption Performance

Qian

Cai

et al. 2021

Adv Eng Mater

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Herein, the SiC‐coated carbon fiber decorated with SiC nanowire (SiCnw/CF) composites are successfully prepared by one‐step chemical vapor infiltration (CVI) process. Microstructures, the formation mechanism of SiCnws, thermal stability performance, and electromagnetic wave (EMW) absorption performance of the composites are investigated in detail. In particularly, benefiting the dielectric loss and conductive loss, the SiCnw/CF composites obtained at 1500 °C exhibit superior EMW absorption property with the minimum reflection loss (RL) of −36.5 dB with the effective absorption band of 5.5 GHz at a thickness of 1.88 mm. This work provides a simple way to obtain and design the CF‐based materials with good microwave absorption.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of SiC Nanowire/Carbon Fiber Composites with Enhanced Electromagnetic Wave Absorption Performance

Qian

Cai

et al. 2021

Adv Eng Mater

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“…Table 1 summarizes the microwave absorption bandwidth of typical ceramic-based composites as a function of temperature at different thicknesses reported in recent literature 5 , 6 , 10 , 22 – 32 . It can be seen that our ceramic composites show a stable and the widest bandwidth higher than 10 GHz from RT to 900 °C compared to other ceramic-based composites, such as oxide-based, PDC-based and other traditional ceramic based composites.…”

Section: Discussionmentioning

confidence: 99%

“…For example, SiC/SiO 2 composites showed an effective absorption bandwidth (EAB, < − 10 dB) of 4.2 GHz at a thickness of 2.8 mm at 500 °C in the X band 4 . C f /SiCNFs/Si 3 N 4 composites had a return loss ( RL ) as low as − 20.3 dB at 800 °C for a thickness of 2 mm 5 . The EAB of SiC f /SiC composites is 2.8 GHz at a thickness of 2.5 mm at 600 °C for the X band 6 .…”

Section: Introductionmentioning

confidence: 99%

Polymer-derived SiOC reinforced with core–shell nanophase structure of ZrB2/ZrO2 for excellent and stable high-temperature microwave absorption (up to 900 °C)

Jia

Yang

et al. 2023

Sci Rep

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Microwave absorbing materials for high-temperature harsh environments are highly desirable for aerodynamically heated parts and engine combustion induced hot spots of aircrafts. This study reports ceramic composites with excellent and stable high-temperature microwave absorption in air, which are made of polymer-derived SiOC reinforced with core–shell nanophase structure of ZrB2/ZrO2. The fabricated ceramic composites have a crystallized t-ZrO2 interface between ZrB2 and SiOC domains. The ceramic composites exhibit stable dielectric properties, which are relatively insensitive to temperature change from room temperature to 900 °C. The return loss exceeds − 10 dB, especially between 28 and 40 GHz, at the elevated temperatures. The stable high-temperature electromagnetic (EM) absorption properties are attributed to the stable dielectric and electrical properties induced by the core–shell nanophase structure of ZrB2/ZrO2. Crystallized t-ZrO2 serve as nanoscale dielectric interfaces between ZrB2 and SiOC, which are favorable for EM wave introduction for enhancing polarization loss and absorption. Existence of t-ZrO2 interface also changes the temperature-dependent DC conductivity of ZrB2/SiOC ceramic composites when compared to that of ZrB2 and SiOC alone. Experimental results from thermomechanical, jet flow, thermal shock, and water vapor tests demonstrate that the developed ceramic composites have high stability in harsh environments, and can be used as high-temperature wide-band microwave absorbing structural materials.

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“…[1][2][3] Typical examples include electromagnetic interference shielding component, 4,5 energy storage equipment, 6,7 microwave absorption device, 8 etc. Generally, ordinary composites can be classified into the polymer-based, 9,10 metal-based, 11 and ceramic-based composites 12,13 according to the matrix material. Polymerbased and metal-based composites are easily damaged in the complex high-temperature environment, for example, rocket engines in the aerospace.…”

Section: Introductionmentioning

confidence: 99%

Multi‐scale modeling for frequency‐dependent dielectric responses of non‐uniform porous carbon fiber/mullite composites

Xia

Zhao

Long

et al. 2021

Int J Applied Ceramic Tech

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The frequency-dependent dielectric responses of non-uniformly dispersed porous carbon fiber/mullite composites fabricated by gel-casting are intensively investigated in the X-band range. Experimental data have shown the frequency dependence of dielectric permittivity and electrical conductivity of the overall composite. The dielectric responses of non-uniformly dispersed porous carbon fiber/mullite composites in X-band are quantitatively modeled through a multi-scale homogenization method based on the effective-medium approximation. The non-uniform dispersion of carbon fibers and micro-pores in the mullite ceramic has been included via a corresponding multi-scale geometric setting. The effective dielectric permittivity and electrical conductivity of the composite both enhance with the fiber volume concentration. It is demonstrated that the decreasing dielectric permittivity and increasing electrical conductivity with respect to the AC frequency can be attributed to frequency-dependent dielectric relaxation and electron hopping effects at the interface. Furthermore, improving the uniform dispersion of carbon fibers in the mullite is essential to achieve the enhanced dielectric response of porous carbon fiber/mullite composites. The present paper can provide the directions to design the porous carbon fiber/mullite composites for micro-electronic devices in the high-temperature environment. K E Y W O R D Sdielectric response, multi-scale, non-uniform dispersion, porous carbon fiber/mullite composite, X-band How to cite this article: Xia X, Zhao S, Long L, Li Y, Zhou W. Multi-scale modeling for frequency-dependent dielectric responses of non-uniform porous carbon fiber/ mullite composites.

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High‐temperature electromagnetic wave absorption properties of C_f/SiCNFs/Si₃N₄ composites

Cited by 82 publications

References 41 publications

Preparation of SiC Nanowire/Carbon Fiber Composites with Enhanced Electromagnetic Wave Absorption Performance

Preparation of SiC Nanowire/Carbon Fiber Composites with Enhanced Electromagnetic Wave Absorption Performance

Polymer-derived SiOC reinforced with core–shell nanophase structure of ZrB2/ZrO2 for excellent and stable high-temperature microwave absorption (up to 900 °C)

Multi‐scale modeling for frequency‐dependent dielectric responses of non‐uniform porous carbon fiber/mullite composites

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