Wave-transmitting material to optimize impedance matching and enhance microwave absorption properties of flaky carbonyl iron coating

Ma, Guiping; Zeng, Yiming; Yang, Xuan; Liu, Yi; Duan, Yuping

doi:10.1007/s10854-020-03398-4

Cited by 11 publications

(3 citation statements)

References 39 publications

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“…As shown in Figure 10 c, the peak pressure of the shock wave before reflection attenuates from 4147.6 MPa at 50 ns to 1851.6 MPa at 190 ns, but the peak pressure becomes −2235.2 MPa after reflection, indicating that the incident compression wave forms a tensile wave after reflection. The increase in pressure value is due to the coupling between the reflected tensile wave and the tensile unloaded wave after the incident compression wave [ 21 ]. It can be seen from Figure 10 d that the reflected shock wave is gradually formed within 190~250 ns, and the peak pressure of the reflected tensile wave is located at the sub-back (0.8 mm).…”

Section: Results and Analysismentioning

confidence: 99%

Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component

et al. 2021

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In the laser shock peening process of titanium alloy thin blades, a shock wave will be repeatedly reflected and coupled in the blades, resulting in the failure of the formation of a gradient residual compressive stress layer, which is the key to improve fatigue performance and resist foreign object impact. This paper takes TC17 titanium alloy sheet as the research object to reveal the influence mechanism on residual stress-strain profile of shock wave reflection-coupling by shock wave propagation and key position dynamic response. Based on the result of influence mechanism, two wave transmission methods are proposed to regulate shock wave in order to reduce the intensity of shock wave reflection. The analysis shows that the high strength stress be formed when the shock wave is reflected and coupled in the sheet, which causes the re-plastic deformation and the decrease of transverse plastic strain. This eventually leads to residual tensile stress up to 410 MPa being formed within a 0.5 mm radial direction and 0.3 mm deep of the spot range. The use of "soft" and "hard" wave-transmitting layers greatly reduces the shock wave reflection intensity, and under the condition of the "hard" wave-transmitting layer, a better impedance matching is achieved, resulting in a residual compressive stress of about 400 MPa.

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Section: Results and Analysismentioning

confidence: 99%

Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component

et al. 2021

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“…Among the widely used magnetic EM absorption candidates, carbonyl iron powder (CIP) is a magnetic loss-type ultrafine ferromagnetic metal powder absorber with high permeability, large saturation magnetization strength, and excellent temperature stability, as well as low cost and good electromagnetic absorption performance at low frequencies (S,C band). − For isotropic magnetic particles, it is found that defects of large thickness lead to a low dielectric constant and unsatisfactory electromagnetic wave absorption performance. − Unfortunately, no reports have been published on the application of LDH/CIP composites for electromagnetic wave absorption. By introducing CIP as the substrate, the large specific surface area helps to improve the dispersion of NiFe LDH nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Nickel Iron Layered Double Hydroxide Nanostructures Composited with Carbonyl Iron Powder for Microwave Absorption

Dai

Zhou

Dong

et al. 2023

ACS Appl. Nano Mater.

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The specific nanostructure of the absorber is a key factor in improving the electromagnetic absorption performance. Herein, NiFe layered double hydroxide composited with carbonyl iron powder (LDH/CIP) was fabricated by a one-step hydrothermal synthesis process for the first time. By varying the morphology of the CIP template (spherical or flaky), the nanostructure of in situ grown LDH could be modulated, to optimize the electromagnetic wave absorption performance of LDH. The resultant NiFe/CIP synergistic composite has proved its excellent electromagnetic (EM) wave absorption performance with the minimum reflection loss (RL min ) of −96.5 dB and an effective absorption bandwidth (EAB) up to 7.6 GHz at the thickness of 8 mm. At a smaller thickness of 3 mm, the EAB value remains 7.2 GHz with the RL min of −16.4 dB. Such an outstanding absorption capacity is primarily attributed to the magnetic loss of NiFe LDH, which is more significantly enhanced using CIP as the substrate. Moreover, the formation of nano-flower-like LDHs, which possess rich heterogeneous structural interfaces and specific surface area to induce the polarization relaxation of the absorber. Therefore, the established NiFe/CIP composite brings insights into the design of high-performance EM wave absorbers.

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“…However, the high density and Snoek limit make it difficult to meet the requirements of light and wide-band microwave absorption. It was reported that milling the spherical carbonyl iron (SCI) to the flake carbonyl iron (FCI) would render it the ability to break through Snoek limit and enhance magnetic loss due to the shape anisotropy [5][6][7]. Thermoplastic polyurethane elastomer (TPU) is widely used in various absorbing materials because of its excellent chemical and mechanical properties, low price and easy processing [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electromagnetic Absorption of Flake Carbonyl Iron/Reduced Graphene Oxide Composites

Liu

Wang

You

et al. 2022

MSF

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Carbonyl iron is an excellent microwave absorption material. However, the high density limits its application in lightweight microwave absorbing. In this study, flake carbonyl iron (FCI) was prepared by high-energy ball milling, and mixed with TPU to prepare the TPU/FCI composites. The large shape anisotropy of FCI makes the TPU/FCI samples exhibit higher permittivity and permeability, and consequently better microwave absorption performance than TPU/SCI (spherical carbonyl iron). Then, rGO was added into the TPU/FCI composites. The permittivity of the TPU/FCI/rGO composites is significantly enhanced by a few amount of rGO (less than 0.5 wt.%). As a result, the TPU/FCI/rGO sample with mFCI: mTPU = 3:10 and 0.5 wt.% rGO consumes only half of FCI that the TPU/FCI sample with mFCI: mTPU = 6:10 uses, and shows much better microwave absorbing performance than this TPU/FCI sample, that the minimum reflection loss reaches-68.3 dB (at 3.4 mm) and the effective absorption bandwidth is up to 5.9 GHz (at 1.5 mm). The TPU/FCI/rGO materials demonstrate promising application in light-weight high-efficient microwave attenuation.

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Wave-transmitting material to optimize impedance matching and enhance microwave absorption properties of flaky carbonyl iron coating

Cited by 11 publications

References 39 publications

Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component

Formation Mechanism and Control Method of Residual Stress Profile by Laser Shock Peening in Thin Titanium Alloy Component

Nickel Iron Layered Double Hydroxide Nanostructures Composited with Carbonyl Iron Powder for Microwave Absorption

Enhanced Electromagnetic Absorption of Flake Carbonyl Iron/Reduced Graphene Oxide Composites

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