Dielectric and microwave absorption properties of plasma sprayed Cr/Al2O3 composite coatings

Zhou, Liang; Shan, Cui; Zhai, Ying; Luo, Fa; Dong, Yangyang

doi:10.1016/j.ceramint.2015.08.024

Cited by 43 publications

(16 citation statements)

References 23 publications

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“…reported that the RL min of the coating with 1.5 mm in thickness was −9 dB . In our previous study, the Cr/Al 2 O 3 coating filled with 15 vol% Cr exhibited the RL min −33.3 dB at 8.8 GHz and an absorption bandwidth 1.5 GHz (RL<−10 dB), when the coating thickness was 1.7 mm . In this work, the strong absorption peak −45.35 dB at 10.3 GHz and effective absorption bandwidth 1.6 GHz (RL<−10 dB) from 9.8 to 11.4 GHz are observed in the Al 2 O 3 –15Cr coating with 1.32 mm in thickness.…”

Section: Resultssupporting

confidence: 55%

“…In our previous work, the dielectric properties of dense Cr/Al 2 O 3 coatings prepared from ball-milled and spray-dried powders were researched. 16 However, the results presented lower permittivity and microwave absorption ability. Besides, it has been found that the coatings deposited from feedstock powders with different characteristics exhibited completely different microstructure, complex permittivity, and microwave absorption properties.…”

Section: Introductionmentioning

confidence: 82%

“…The copper anode nozzle has an inner diameter of 5 mm and the powder is fed internally into the plasma plume, confirming that the feedstock powders will | 621 not be accumulated in the inner of the copper anode nozzle but melt in the plasma flame. 16 The used plasma power was~9.8 kW, and the primary, secondary, and carrier gases were Ar, N 2 , and N 2 , respectively. More detail plasma spraying conditions adopted in this study are listed in Table 2.…”

Section: Preparation Of the Coatingsmentioning

confidence: 99%

“…By comparison, the porosity of the coatings prepared with spray-dried powders is much higher than those of the coatings fabricated with ball-milled and spray-dried powders. 16 This is due to the fact that when the ball milling of mixed powders is used before spray drying process, the Cr and Al 2 O 3 particles have a better combination because of the plastic deformation of metallic Cr, resulting in the coatings with fewer pores.…”

Section: Microstructurementioning

confidence: 99%

“…Besides, the microstructure of coatings also plays an important role in affecting the complex permittivity and reflection loss (RL). In our previous work, the dielectric properties of dense Cr/Al 2 O 3 coatings prepared from ball‐milled and spray‐dried powders were researched . However, the results presented lower permittivity and microwave absorption ability.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced dielectric and microwave absorption properties of Cr/Al₂O₃ coatings deposited by low‐power plasma spraying

et al. 2016

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Low‐power plasma‐sprayed Cr/Al2O3 coatings have been developed for their potential application as broad bandwidth, thin thickness, lightweight, and strong microwave‐absorbing materials. The dielectric and microwave absorption properties of the as‐sprayed coatings were studied in the X‐band (from 8.2 to 12.4 GHz). High complex permittivity of the coatings was obtained because of a large number of internal boundaries and the conductive networks. Meanwhile, a significant enhancement of microwave absorption properties of the coating was achieved due to the enhanced interfacial polarization and conductance loss. The reflection loss (RL) <−10 dB of the Al2O3–15Cr coating was obtained from 9.8 to 11.4 GHz by choosing an appropriate coating thickness, and an optimal minimum reflection loss (RLmin) of −45.35 dB was achieved at 10.3 GHz with a thin thickness of 1.32 mm.

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 82%

Section: Preparation Of the Coatingsmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced dielectric and microwave absorption properties of Cr/Al₂O₃ coatings deposited by low‐power plasma spraying

et al. 2016

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The Strong Broadband Microwave Absorption Properties of FeSiCr@Ni_0.5Zn_0.5Fe₂O₄ Composites Realized by Optimizing Impedance Matching

Hou,

Ma,

Yang

et al. 2024

Physica Status Solidi (a)

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Flaky FeSiCr@Ni0.5Zn0.5Fe2O4 composites are successfully synthesized via ball milling and hydrothermal method. The microstructure, morphology, and phase composition of flaky FeSiCr@Ni0.5Zn0.5Fe2O4 composites are analyzed using X‐Ray diffractometer, energy dispersive spectroscopy, scanning electron microscope, and transmission electron microscope techniques. The electromagnetic wave absorption characteristics of the composite with varying contents of Ni0.5Zn0.5Fe2O4 are comprehensively investigated. The results show that the introduction of Ni0.5Zn0.5Fe2O4 reduces the permittivity, improves the synergistic effect of magnetic loss and dielectric loss, optimizes the impedance matching, and enhances the overall electromagnetic performance of the composites. The sample prepared with a composition of 40 wt% Ni0.5Zn0.5Fe2O4 displays the most pronounced absorption performance. The RLmin (reflection loss) reached −41.3 dB at 4.3 GHz, and the maximum effective absorption bandwidth (EAB) reaches 5.6 GHz which is 7–8 times that of the original sample. Notably, through adjusting the thickness of composites, the EAB could be broadened to 10.5 GHz (2.5–13.0 GHz), encompassing the entire C and X bands. The flaky FeSiCr@Ni0.5Zn0.5Fe2O4 composites have the advantages of wide source of raw materials, strong microwave absorption ability, and wide absorption frequency range, and are expected to become a potential microwave absorption material in the future.

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Effect of initial particle size on microstructure and dielectric properties of Cr/Al2O3 coatings deposited by plasma spraying

Zhou

Chen

Dong

et al. 2016

J Mater Sci: Mater Electron

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Dielectric and microwave absorption properties of plasma sprayed Cr/Al2O3 composite coatings

Cited by 43 publications

References 23 publications

Enhanced dielectric and microwave absorption properties of Cr/Al₂O₃ coatings deposited by low‐power plasma spraying

Enhanced dielectric and microwave absorption properties of Cr/Al₂O₃ coatings deposited by low‐power plasma spraying

The Strong Broadband Microwave Absorption Properties of FeSiCr@Ni_0.5Zn_0.5Fe₂O₄ Composites Realized by Optimizing Impedance Matching

Effect of initial particle size on microstructure and dielectric properties of Cr/Al2O3 coatings deposited by plasma spraying

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Dielectric and microwave absorption properties of plasma sprayed Cr/Al2O3 composite coatings

Cited by 43 publications

References 23 publications

Enhanced dielectric and microwave absorption properties of Cr/Al2O3 coatings deposited by low‐power plasma spraying

Enhanced dielectric and microwave absorption properties of Cr/Al2O3 coatings deposited by low‐power plasma spraying

The Strong Broadband Microwave Absorption Properties of FeSiCr@Ni0.5Zn0.5Fe2O4 Composites Realized by Optimizing Impedance Matching

Effect of initial particle size on microstructure and dielectric properties of Cr/Al2O3 coatings deposited by plasma spraying

Contact Info

Product

Resources

About

Enhanced dielectric and microwave absorption properties of Cr/Al₂O₃ coatings deposited by low‐power plasma spraying

Enhanced dielectric and microwave absorption properties of Cr/Al₂O₃ coatings deposited by low‐power plasma spraying

The Strong Broadband Microwave Absorption Properties of FeSiCr@Ni_0.5Zn_0.5Fe₂O₄ Composites Realized by Optimizing Impedance Matching