Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption

Bobzin, Kirsten; Bolelli, Giovanni; Bruehl, Markus; Hujanen, Arto; Lintunen, Pertti; Lisjak, Darja; Gyergyek, Sašo; Lusvarghi, Luca

doi:10.1016/j.jeurceramsoc.2011.02.003

Cited by 27 publications

(6 citation statements)

References 52 publications

(51 reference statements)

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“…From the EDS element analysis in Figure 4, it can be seen that the white area is a flake iron‐rich fine crystal and reliable preservation is obtained during the APS process. The melting degree of ceramic composite particles affects the formation of spherical droplets and determines the relative density 22 . During the APS process, the FSA particles are well melted due to the low melting point, thus reducing the porosity of the coating.…”

Section: Resultsmentioning

confidence: 99%

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Ultra‐broadband electromagnetic wave absorption of ceramic composite coating by atmospheric plasma spraying

et al. 2023

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Dy doped ceramic material of Ba4Fe2.6Dy1.4Nb8O30 with the tetragonal black bronze structure was synthesized by solid‐state reaction at 1300°C. The composite powders of Ba4Fe2.6Dy1.4Nb8O30/FeSiAl with good flowing were prepared by spray drying using the powders slurry. The obtained composite powders were then plasma sprayed to fabricate coating. The microstructure and absorption characteristics of electromagnetic wave (EMW) of the coating materials are investigated. Results show that the composite powders significantly remain the phase stability during atmospheric plasma spraying and adsorbing heredity of EMW for the coating. The coating powders have excellent EMW absorption with the minimum reflection loss of −48.20 dB at the thickness of 3.5 mm. Also, the coating powders display the maximum effective absorption bandwidth of 6.24 GHz at the thickness of 1.5 mm, which covers the X‐band. Moreover, the coating was found to have a certain EMW absorption performance at high temperature of 700°C. The Ba4Fe2.6Dy1.4Nb8O30 ceramic material with low thermal conductivity ensured the electromagnetic absorption capacity of the coating at high temperature. The Ba4Fe2.6Dy1.4Nb8O30/FeSiAl ceramic composite materials could have the potential applications as the high temperature EMW absorber.

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Section: Resultsmentioning

confidence: 99%

“…The melting degree of ceramic composite particles affects the formation of spherical droplets and determines the relative density. 22 During the APS process, the FSA particles are well melted due to the low melting point, thus reducing the porosity of the coating.…”

Section: Structural and Morphological Analysismentioning

confidence: 99%

Ultra‐broadband electromagnetic wave absorption of ceramic composite coating by atmospheric plasma spraying

et al. 2023

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“…However, the deposition of untreated agglomerates did not result in adequate amounts of crystalline Ba–hexaferrite in the coatings, and the APS processing of reactively sintered agglomerates led to a high content of Ba–hexaferrite and similar magnetic properties to those of Ba–hexaferrite bulk materials. In another study, Bobzin et al (2011) [ 87 ] used two different kind of feedstock powders: 1) spray‐dried agglomerates of micrometric SrFe 12 O 19 particles or 2) spray‐dried agglomerates of raw materials (SrCO 3 , Fe 2 O 3 ), reactively sintered at 1100 °C. The high magnetic loss of crystalline SrFe 12 O 19 plasma‐sprayed coatings at about 50 GHz shows that such coatings are promising candidates for EM wave absorption applications (in mm‐wave range).…”

Section: Electromagnetic Wave Propagation Characteristics Of Thermal ...mentioning

confidence: 99%

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

et al. 2022

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This review aims to consolidate scattered literature on thermally sprayed coatings with nonionizing electromagnetic (EM) wave absorption and shielding over specific wavelengths potentially useful in diverse applications (e.g., microwave to millimeter wave, solar selective, photocatalytic, interference shielding, thermal barrier‐heat/emissivity). Materials EM properties such as electric permittivity, magnetic permeability, electrical conductivity, and dielectric loss are critical due to which a material can respond to absorbed, reflected, transmitted, or may excite surface electromagnetic waves at frequencies typical of electromagnetic radiations. Thermal spraying is a standard industrial practice used for depositing coatings where the sprayed layer is formed by successive impact of fully or partially molten droplets/particles of a material exposed to high or moderate temperatures and velocities. However, as an emerging novel application of an existing thermal spray techniques, some special considerations are warranted for targeted development involving relevant characterization. Key potential research areas of development relating to material selection and coating fabrication strategies and their impact on existing practices in the field are identified. The study shows a research gap in the feedstock materials design and doping, and their complex selection covered by thermally sprayed coatings that can be critical to advancing applications exploiting their electromagnetic properties.

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“…[5] The SrFe 12 O 19 is widely used in microwave area because of many advantages, such as large magnetic anisotropy, high coercive force, and stable chemical properties. [6][7][8] Carbonyl iron (CI) has been extensively used as an absorption material due to its simple preparation, low cost, large magnetic loss angle, and strong absorption ability. [9][10][11][12] The CI presents good dielectric properties at high frequencies, and its content in composite materials can be effectively adjusted to regulate complex permittivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of deposition temperature on SrFe₁₂O₁₉@carbonyl iron core–shell composites as high-performance microwave absorbers

Yuan¹,

Rong²,

Jia³

et al. 2020

Chinese Phys. B

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The SrFe12O19@carbonyl iron (CI) core–shell composites used in microwave absorption are prepared by the metal–organic chemical vapor deposition (MOCVD). The x-ray diffractometer, scanning electron microscope, energy dispersive spectrometer, and vector network analyzer are used to characterize the structural, electromagnetic, and absorption properties of the composites. The results show that the SrFe12O19@CI composites with a core–shell structure could be successfully prepared under the condition: deposition temperatures above 180 °C, deposition time 30 min, and gas flow rate 30 mL/min. The electromagnetic properties of the composites change significantly, and their absorption capacities are improved. Of the obtained samples, those samples prepared at a deposition temperature of 180 °C exhibit the best absorption performance. The reflection loss of SrFe12O19@CI (180 °C) with 1.5 mm–2.5 mm in thickness is less than −10 dB in a frequency range of 8 GHz–18 GHz, which covers the whole X band and Ku band.

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Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption

Cited by 27 publications

References 52 publications

Ultra‐broadband electromagnetic wave absorption of ceramic composite coating by atmospheric plasma spraying

Ultra‐broadband electromagnetic wave absorption of ceramic composite coating by atmospheric plasma spraying

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

Effect of deposition temperature on SrFe₁₂O₁₉@carbonyl iron core–shell composites as high-performance microwave absorbers

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Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption

Cited by 27 publications

References 52 publications

Ultra‐broadband electromagnetic wave absorption of ceramic composite coating by atmospheric plasma spraying

Ultra‐broadband electromagnetic wave absorption of ceramic composite coating by atmospheric plasma spraying

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

Effect of deposition temperature on SrFe12O19@carbonyl iron core–shell composites as high-performance microwave absorbers

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Effect of deposition temperature on SrFe₁₂O₁₉@carbonyl iron core–shell composites as high-performance microwave absorbers