Tunable microwave absorption performance of carbon fiber-reinforced reaction bonded silicon nitride composites

Logesh, G.; Sabu, Ummen; Srishilan, C.; Rashad, Mohammed; Joseph, Andrews; Raju, K. C. James; Balasubramanian, M.

doi:10.1016/j.ceramint.2021.04.265

Cited by 33 publications

(7 citation statements)

References 53 publications

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“…Numerous researches have been reported on compound EM wave absorbers. [ 72 , 73 , 74 , 75 ] Among them, composites composed of magnetic materials and high‐conductive materials are the typical representative of such absorbers. Magnetic components can provide magnetic loss while high‐conductive parts will provide dielectric loss (conductive loss), combining with interfacial polarization supplied by heterogeneous interfaces between them, strong EM wave attenuation capacity is harvest.…”

Section: Dielectric Loss Mechanismsmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional in military stealth and incoming 5G smart era. Dielectric loss EM wave absorbers and underlying loss mechanism investigation are of great significance to unveil EM wave attenuation behaviors of materials and guide novel dielectric loss materials design. However, current researches focus more on materials synthesis rather than in-depth mechanism study. Herein, comprehensive views toward dielectric loss mechanisms including interfacial polarization, dipolar polarization, conductive loss, and defect-induced polarization are provided. Particularly, some misunderstandings and ambiguous concepts for each mechanism are highlighted. Besides, in-depth dielectric loss study and novel dielectric loss mechanisms are emphasized. Moreover, new dielectric loss mechanism regulation strategies instead of regular components compositing are summarized to provide inspiring thoughts toward simple and effective EM wave attenuation behavior modulation.

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Section: Dielectric Loss Mechanismsmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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“…The samples were mixed with molten paraffin at a mass fraction of 10 wt % and then cut into a ring with an inner diameter of 3 mm and an outer diameter of 7 mm. Based on the Naito and Suetake model, the RL value was calculated according to eqs and : , Z in = μ r ε r tan nobreak0em.25em⁡ h ( j 2 π f d c μ r ε r ) RL ( dB ) = 20 log | Z in − 1 Z in + 1 | where Z in is the normalized input impendence at the interface of air and samples, c is the velocity of light in vacuum, f is the frequency of incident waves, and d is the thickness of the samples.…”

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Ti 3 C 2 Tmentioning

confidence: 99%

Hollow Spheres of Ti₃C₂T_x with a Nanometer-Thick Wall for High-Performance Microwave Absorption

Liu

Wang

et al. 2022

ACS Appl. Nano Mater.

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Two-dimensional (2D) Ti3C2T x MXene has attracted huge attention in the field of electromagnetic wave attenuation, but its poor impedance matching with air leads to weak microwave absorption (MA) capability. Herein, hollow spheres of Ti3C2T x with a nanometer-thick wall were prepared through a sacrificial template strategy, and their MA performance was investigated for the first time. The unique macroporous structure constructed by Ti3C2T x hollow spheres benefits excellent MA performance by improving impedance matching, multiple reflections and scattering, and polarization relaxation. With only 10 wt % filler loading in the paraffin, the minimum reflection loss (RLmin) of Ti3C2T x hollow spheres can reach −49.2 dB at 10.3 GHz at a thickness of 2 mm, which is much superior to that of Ti3C2T x nanosheets (−7.4 dB). Moreover, the MA performance of Ti3C2T x hollow spheres can be adjusted in the range of 3.7–16.5 GHz by changing the cavity size and thickness. This study provides a facile and effective strategy for designing lightweight and high-performance MXene-based microwave absorbers.

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Section: Introductionmentioning

confidence: 99%

“…With the rapid development of electromagnetic technology, electromagnetic wave pollution has gradually attracted widespread attention, which will seriously endanger human health. For decades, researchers have prepared a series of high-performance microwave absorbing (MA) materials, , such as, carbon materials (carbon nanotubes, , graphene, , carbon fibers, , etc. ), conductive polymers, − and nanocomposites. − However, in practical application, especially in a complex environment with high salt spray, the single-function MA materials with poor environmental adaptability usually fail due to severe corrosion behavior, which may lead to terrible safety accidents and huge economic losses.…”

Section: Introductionmentioning

confidence: 99%

Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

Chen

Wang²,

Zheng³

et al. 2022

ACS Appl. Nano Mater.

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In recent years, microwave absorbing (MA) materials have developed rapidly and made good progress. However, MA materials with thin thickness and light weight are still a huge challenge. Furthermore, the application of single-function MA materials is severely restricted due to poor environmental adaptability in actual use, especially in harsh marine environments. Herein, we prepared graphene oxide/chiral polypyrrole hybrid (GO/CPPy) materials, which showed microwave absorbing properties combined with anticorrosion performance, by in situ polymerization. The sheet-layer GO/CPPy was composed of chiral helical polypyrrole and two-dimensional GO sheets. The introduction of chiral polypyrrole not only brought good dielectric loss but also produced additional magnetic loss. As a result, the GO/CPPy hybrids indicated a strong reflection loss (RL) of −55.5 dB at 8.55 GHz with a thickness of 3.8 mm. Meanwhile, they exhibited a broad effective bandwidth of 8.4 GHz from 9.1 to 17.5 GHz. In addition, 0.6% GO/CPPy-EP composite coatings displayed excellent long-term corrosion resistance with a remarkable corrosion protection capability (99.73%) after 21 days of immersion in a corrosive medium. Furthermore, the corresponding 6% GO/CPPy-EP microwave absorbing coatings retained high MA performance with a minimum RL of −27.5 dB at 12.38 GHz, which was tested using a bow reflectivity test system after immersion in 3.5% NaCl solution for 21 days. Moreover, the MA performance dropped only by 13.79%. This work could open new avenues toward the development of MA materials with corrosion protection performance.

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Tunable microwave absorption performance of carbon fiber-reinforced reaction bonded silicon nitride composites

Cited by 33 publications

References 53 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Hollow Spheres of Ti₃C₂T_x with a Nanometer-Thick Wall for High-Performance Microwave Absorption

Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

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Tunable microwave absorption performance of carbon fiber-reinforced reaction bonded silicon nitride composites

Cited by 33 publications

References 53 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Hollow Spheres of Ti3C2Tx with a Nanometer-Thick Wall for High-Performance Microwave Absorption

Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

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Product

Resources

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Hollow Spheres of Ti₃C₂T_x with a Nanometer-Thick Wall for High-Performance Microwave Absorption