High-temperature dielectric and microwave absorption performances of TiB2/Al2O3 ceramics prepared by spark plasma sintering

Liu, Xiongzhang; Luo, Hui; Li, YinRui; Fu, Changhui; Liu, JieLing; Yang, Wentao; Wang, Xian; Gong, Rongzhou

doi:10.1007/s11431-020-1795-x

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…It is well known that the electromagnetic wave absorption performance can be expressed by the reflection loss (RL) value [ 23 ]. The RL value can be calculated from the experimentally determined complex permittivity, characterizing the microwave absorption properties [ 24 ]. According to the transmission line theory of relative complex permittivity and magnetic permeability, the reflection loss can be expressed as [ 25 , 26 , 27 ]:

where Z in denotes the normalized input impedance of the absorbing material, Z 0 denotes the input impedance in free space,

denotes the relative complex permittivity, and

denotes the relative complex permeability.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Wang

Yang

et al. 2021

Molecules

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In this work, spherical flower-shaped composite carbonyl iron powder@MnO2 (CIP@MnO2) with CIP as the core and ultrathin MnO2 nanosheets as the shell was successfully prepared by a simple redox reaction to improve oxidation resistance and electromagnetic wave absorption properties. The microwave-absorbing properties of CIP@MnO2 composites with different filling ratios (mass fractions of 20%, 40%, and 60% after mixing with paraffin) were tested and analyzed. The experimental results show that compared with pure CIP, the CIP@MnO2 composites have smaller minimum reflection loss and a wider effective absorption bandwidth than CIP (RL < −20 dB). The sample filled with 40 wt% has the best comprehensive performance, the minimum reflection loss is −63.87 dB at 6.32 GHz, and the effective absorption bandwidth (RL < −20 dB) reaches 7.28 GHz in the range of 5.92 GHz–9.28 GHz and 11.2 GHz–15.12 GHz, which covers most C and X bands. Such excellent microwave absorption performance of the spherical flower-like CIP@MnO2 composites is attributed to the combined effect of multiple beneficial components and the electromagnetic attenuation ability generated by the special spherical flower-like structure. Furthermore, this spherical flower-like core–shell shape aids in the creation of discontinuous networks, which improve microwave incidence dispersion, polarize more interfacial charges, and allow electromagnetic wave absorption. In theory, this research could lead to a simple and efficient process for producing spherical flower-shaped CIP@MnO2 composites with high absorption, a wide band, and oxidation resistance for a wide range of applications.

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where Z in denotes the normalized input impedance of the absorbing material, Z 0 denotes the input impedance in free space,

denotes the relative complex permittivity, and

denotes the relative complex permeability.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Wang

Yang

et al. 2021

Molecules

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“…In the XRD patterns of the PINNC/Al 2 O 3 composites, the six characteristic peaks at 31.9, 37.6, 39.5, 45.9, 60.8, and 67.0° are attributed to the (220), (311), (222), (400), (511), and (440) crystal planes, respectively, of the Al 2 O 3 standard card (JCPDS no. 10-0425) (Figure b) . The results also show that as the mass of added AlOOH increased, the intensity of the graphitic carbon peak got weaker, whereas that of the alumina peak became stronger.…”

Section: Resultsmentioning

confidence: 85%

“…10-0425) (Figure 2b). 20 The results also show that as the mass of added AlOOH increased, the intensity of the graphitic carbon peak got weaker, whereas that of the alumina peak became stronger. No other spurious peaks were found in the patterns, thus indicating the successful synthesis of the PINNC/Al 2 O 3 composites.…”

Section: Fabrication Of Pinnc/al 2 Omentioning

confidence: 83%

Polyindole-Derived Nitrogen-Doped Carbon Nanosphere/Al₂O₃ Composites with High-Performance Microwave Absorption

Xing

Fan

Liu

et al. 2023

ACS Appl. Electron. Mater.

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In this study, polyindole-derived nitrogen-doped carbon nanosphere/Al2O3 (PINNC/Al2O3) composites are fabricated by hydrothermal, in situ aggregation and high-temperature pyrolysis using potassium aluminum sulfate dodecahydrate, urea, and indole as raw materials. The results show that the introduction of alumina modulates the impedance matching and results in the formation of a great deal of interfaces with polyindole-derived nitrogen-doped carbon nanospheres, which promotes the reinforcement of interfacial polarization. Moreover, the unique semicircular spherical structure of alumina and the pleated structure of carbon nanospheres facilitate multiple microwave attenuation. The abundance of in situ nitrogen atom doping in the carbon material and the defects that formed after pyrolysis can supply a great deal of polarization sites for dipole polarization, thus enhancing dipole polarization loss. As the matching thickness reached 2.5 mm, the minimum reflection loss (RL) of the PINNC/Al2O3 composites is −46.08 dB at 16.72 GHz (fill ratio of 0.5). And as the matching thickness is merely 3.0 mm, the effective absorption bandwidth (EAB) is 7.04 GHz. This study can serve as a good guide for the devising of polyindole-derived nitrogen-doped carbon-based electromagnetic microwave absorbents.

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“…Ceramic materials such as Al 2 O 3 , 29 MgO, 27 SiO 2 , 26 and Si 3 N 4 , 2,28 which possess low values in both real and imaginary parts, exhibit excellent impedance matching characteristics. As a result, they are frequently employed as transparent matrix for MA materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and investigation of mechanical and electromagnetic wave absorption properties of TiC–TiB₂/Si₃N₄ composites

Wang,

Bi,

Liang

et al. 2024

J Am Ceram Soc.

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The aim of achieving integration of lightweight, high strength, high‐temperature resistant, and satisfactory electromagnetic (EM) wave absorption was successfully accomplished in the present study by synthesizing TiC–TiB2 fibers reinforced Si3N4 composites, which were pressureless sintered at 1650°C for 2 h. The preparation of TiC–TiB2 fibers was conducted through a chloride‐assisted carbothermic method. This work focused on investigating the effects of incorporating TiC–TiB2 fibers on the mechanical properties and EM wave absorption characteristics of the composites. The 30 wt% TiC–TiB2/Si3N4 composite displayed the bulk density of 1.89 g/cm3, bending strength of 93.11 ± 3.91 MPa, fracture toughness of 1.81 ± 0.10 MPa m1/2, minimum reflection loss of −38.87 dB, and effective absorption bandwidth of 1.43 GHz in the Ku‐band, respectively. The as‐synthesized TiC–TiB2/Si3N4 composites are promising candidates for EM wave absorbing load‐bearing materials due to their outstanding mechanical properties and microwave absorption properties.

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High-temperature dielectric and microwave absorption performances of TiB2/Al2O3 ceramics prepared by spark plasma sintering

Cited by 6 publications

References 36 publications

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Polyindole-Derived Nitrogen-Doped Carbon Nanosphere/Al₂O₃ Composites with High-Performance Microwave Absorption

Preparation and investigation of mechanical and electromagnetic wave absorption properties of TiC–TiB₂/Si₃N₄ composites

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High-temperature dielectric and microwave absorption performances of TiB2/Al2O3 ceramics prepared by spark plasma sintering

Cited by 6 publications

References 36 publications

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Polyindole-Derived Nitrogen-Doped Carbon Nanosphere/Al2O3 Composites with High-Performance Microwave Absorption

Preparation and investigation of mechanical and electromagnetic wave absorption properties of TiC–TiB2/Si3N4 composites

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Resources

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Polyindole-Derived Nitrogen-Doped Carbon Nanosphere/Al₂O₃ Composites with High-Performance Microwave Absorption

Preparation and investigation of mechanical and electromagnetic wave absorption properties of TiC–TiB₂/Si₃N₄ composites