A novel SiC-based microwave absorption ceramic with Sc2Si2O7 as transparent matrix

Wei, Hanjun; Yin, Xiaowei; Hou, Zexin; Jiang, Fengrui; Xu, Hailong; Li, Minghang; Zhang, Litong; Cheng, Laifei

doi:10.1016/j.jeurceramsoc.2018.05.005

Cited by 46 publications

(16 citation statements)

References 52 publications

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“…It is well identified that the microwave absorbing performances of materials are mainly administered by the relative complex permittivity ( and permeability ( [28,29]. The frequency dependence of and for the ceramics was measured by a vector network analyzer, as presented in Fig.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3–(1 − x)Sr0.85Gd0.15TiO3 ceramics in X-band

Xie

Yang

Zhou

et al. 2020

J Mater Sci: Mater Electron

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xAl 2 O 3-(1-x)Sr 0.85 Gd 0.15 TiO 3 (x=0.2, 0.3, 0.4, 0.5) ceramics were fabricated by hot-press sintering. Their morphology, phase composition, conductivity, dielectric properties as well as microwave absorption performance were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), multifunction digital four-probe meter and vector network analysis, respectively. The microwave absorption of as-prepared xAl 2 O 3-(1-x)Sr 0.85 Gd 0.15 TiO 3 ceramics demonstrates excellent microwave absorbability. It is unexpectedly found that with a thickness of only 0.346 mm, xAl 2 O 3-(1x)Sr 0.85 Gd 0.15 TiO 3 (x=0.2) ceramic exhibits an absorption bandwidth of 3.7 GHz (8.7-12.4 GHz), being consequential to re ection loss less than-10 dB (over 90% of microwave absorption). It is as well discovered that the minimum re ection loss and absorption peak frequency of xAl 2 O 3-(1x)Sr 0.85 Gd 0.15 TiO 3 (x=0.3) with a thickness of 0.436 mm were-45.43 dB and 11.3 GHz, respectively. The prominent microwave absorption performance of the ceramic with such a thin thickness can be attributed to strong interfacial polarization, dielectric frequency dispersion, and good electromagnetic impedance matching. It indicates that the xAl 2 O 3-(1-x)Sr 0.85 Gd 0.15 TiO 3 ceramics with appropriate Al 2 O 3 mass fraction and thickness showing good potential for effective microwave absorbing materials.

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Section: Dielectric Propertiesmentioning

confidence: 99%

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3–(1 − x)Sr0.85Gd0.15TiO3 ceramics in X-band

Xie

Yang

Zhou

et al. 2020

J Mater Sci: Mater Electron

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“…In comparison with polymers, ceramics have excellent oxidation resistance and creep resistance in high‐temperature environments but poor processability 21,22 . Polymer‐derived ceramics (PDCs) provide an excellent route to combine Ti 3 C 2 T x MXene with ceramics.…”

Section: Introductionmentioning

confidence: 99%

MXene‐derived TiC/SiBCN ceramics with excellent electromagnetic absorption and high‐temperature resistance

Ding

Chen

et al. 2020

J Am Ceram Soc

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Demand for high‐performance electromagnetic (EM) wave absorbing materials with high‐temperature resistance is always urgent for application in a harsh environment. In this contribution, two‐dimensional material, Ti3C2Tx MXene, was introduced into a hyperbranched polyborosilazane. After pyrolyzation, the as‐prepared TiC/SiBCN ceramics present excellent EM wave absorption in X‐band. The TiC nanograins appearing after annealing provide multilevel reflection and interface polarization. Dipole polarization formed at interface defects, in company with interfacial polarization, also makes a great contribution to enhanced EM wave absorption. The TiC/SiBCN nanocomplex prepared with 5 wt% Ti3C2Tx MXene possesses a minimum reflection coefficient of −45.44 dB at 10.93 GHz and abroad bandwidth 8.4 and 12.4 GHz, almost covering the entire X‐band. Tuning the thickness in the range of 2.35‐2.54 mm, the effective absorption band can achieve the entire X‐band. And the EM wave absorbing performance has been maintained to a large extent at 600°C with the minimum reflection coefficient of −26.12 dB at 12.13 GHz and the effective absorption bandwidth of 2 GHz. Last but not the least, TiC/SiBCN ceramics offer a good thermal stability in argon as well as in air atmosphere, making it possible to serve in high‐temperature detrimental environments. This study is expected to provide a new perspective for the design of high‐performance absorbing materials that are able to be used in harsh environments, especially in high temperatures.

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“…Directed at this, broadband and high-efficiency microwave absorbing materials (MAMs) are urgently demanded to weaken or eliminate the unwanted electromagnetic signals for next-generation military electronics in aspects of all-electric aircraft, stealth fighter, defense security, etc. (Qi et al, 2016;Wei et al, 2018;Liu et al, 2019). Designing high-performance MAMs and applying these functionalized materials in actual operation are scientifically interesting and of technological importance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

Sheng

et al. 2020

Front. Mater.

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This work aims to achieve the excellent microwave absorption in layered dielectric nickelate compounds. The phase, microstructure, electromagnetic properties, and microwave absorption of the Sr-modified La 2−x Sr x NiO 4±δ (x = 0, 0.3, 0.5, 0.75) nickelates were investigated, determining and analyzing the role of Sr doping level. All compounds reveal the single tetragonal phase identified as the I4/mmm space group, and the lattice parameters correlate with the doping content, evidenced by Rietveld refinement. By introducing strontium, the pronouncedly increased electronic conductivity contributes to the high dielectric loss, which gives rise to a superior attenuation ability and absorbing bandwidth. A minimum reflection loss of-21.07 dB was found in La 2−x Sr x NiO 4±δ (x = 0.75) at a thickness of 1.9 mm, covering the effective bandwidth of 2.9 GHz. This enhanced microwave absorbing performance in nickelate shows promise in the radar absorbing field.

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A novel SiC-based microwave absorption ceramic with Sc2Si2O7 as transparent matrix

Cited by 46 publications

References 52 publications

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3–(1 − x)Sr0.85Gd0.15TiO3 ceramics in X-band

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3–(1 − x)Sr0.85Gd0.15TiO3 ceramics in X-band

MXene‐derived TiC/SiBCN ceramics with excellent electromagnetic absorption and high‐temperature resistance

Enhanced Microwave Absorption Performance in Sr-Modified La2NiO4±δ Nickelate With High Dielectric Loss

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