Preparation and electromagnetic wave absorption performance of Fe3Si/SiC@SiO2 nanocomposites

Silica-based ceramics have been explored extensively as a class of versatile materials for various applications in architecture, catalysis, energy, machinery, and biomedical engineering. Nevertheless, comprehensive information on silica-based ceramic and electromagnetic microwave (EMW) absorption is scarce, although excellent progress has been made in this field. Here, recent progress in the investigation of silica-based ceramics toward EMW absorption is reviewed. We first introduced the basis of ceramics (characteristics, classification, synthetic methods, potential applications). Subsequently, the silica-based ceramics, including Si-based oxides and alloys, SiOC/SiC/Si3N4/SiCN-based composite, Ti3SiC2 and composite for EMW absorption were systematically summarized. Notably, the fabrication strategies, absorption properties, and mechanisms of silica-based ceramics are described in detail, with a focus on structure and component design. Lastly, the prospects and ongoing challenges of this field in the future are presented. This review is expected to learn from the past and achieve progress toward the future of silica-based ceramic for EMW absorption.

Silica-based ceramics toward electromagnetic microwave absorption

The dielectric behavior and efficient microwave absorption of doped nanoscale LaMnO3 at elevated temperature

A Review Study on Thermal Stability of High Entropy Alloys: Normal/Abnormal Resistance of Grain Growth

A refractory TiNbZrMoV high-entropy alloy (HEA) coating was intentionally designed and prepared by magnetron sputtering, and static lead‑bismuth eutectic (LBE) corrosion tests with saturated oxygen were performed to investigate the corrosion behavior of the coatings at 650 °C. The obtained results show that the coating maintained good integrity and significantly mitigated the LBE corrosion of the ferritic/martensitic steel, which originated from the low intrinsic solubility of the coating composition elements and the limitation of element out-diffusion or segregation from the steel and coating. This design of a refractory high-entropy alloy (RHEA) coating provides a novel strategy for the development of LBE corrosion-resistant materials. 

Corrosion behavior of refractory TiNbZrMoV high-entropy alloy coating in static lead‑bismuth eutectic alloy: A novel design strategy of LBE corrosion-resistant coating?

http://manuscript.elsevier.com/S0272884221041596/pdf/S0272884221041596.pdf

Refractory WMoNbVTa high-entropy alloy as a diffusion barrier between a molybdenum substrate and MoSi2 ceramic coating

A single-layer radar-absorbing structure active in the X-band (8.2 GHz to 12.4 GHz) was demonstrated by blending SiC fibres with an AlPO4 matrix material. The as-prepared SiCf/AlPO4 composites were oxidized at 1273 K for several hours to investigate the effects of oxidation on the dielectric and wave-absorbing properties. Scanning and transmission electron microscopy were used to characterize the morphology and microstructure of the composites. The AlPO4-SiO2 solid solution during oxidation promoted the formation of a complete carbon layer on the SiC fibre surface. The real and imaginary parts of the SiCf/AlPO4 composites increased from 4.2–4.4 to 5.9–7.1 and from 0.08–0.2 to 3.9–5.2, respectively, with increasing oxidation time from 0 to 10 h, respectively. When the thickness of the composites increased from 2.9 mm to 3.3 mm, the wave-absorbing property noticeably improved due to the formation of a carbon layer on the SiC fibre surface after oxidation.

Enhanced microwave absorbance of oxidized SiCf/AlPO4 composites via the formation of a carbon layer on the SiC fibre surface

An electromagnetic wave absorbing material acting from 8.2 to 12.4 GHz (X-band) is fabricated by mixing BN-coated SiC fiber with AlPO4 matrix, and using multiwalled carbon nanotubes (MWNCTs) as the...

Improved mechanical and high-temperature electromagnetic wave absorption properties of SiCf/BN/AlPO4 composites with absorber multiwalled carbon nanotubes

Preparation of a nano-size (La0.2Nd0.2Sm0.2Sr0.2Ba0.2)Co0.2Fe0.8O3-δ/SDC high-entropy oxide composite cathode

SiC fiber-reinforced AlPO4 matrix (SiCf/MWCNTs/AlPO4) composites were fabricated using a hot laminating process with multi-walled carbon nanotubes (MWCNTs) as the absorber. A coating prepared from SiO2 + SiC + Al (H2PO4)3 was applied to the surface of the SiCf/MWCNTs/AlPO4 composites prior to an anti-oxidation test at 1273 K in air for 40 h. The anti-oxidation effect was verified by a three-point bending test, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and a dielectric property test. Anti-oxidation mechanism investigations revealed that the coating effectiveness could be attributed to three substances, i.e., SiO2, SiP2O7, and SiO2 + AlPO4 solid solution from the reactions of SiC + O2→SiO2 + CO, SiO2 + P2O5→SiP2O7 and SiO2 + AlPO4→solid solution, respectively.

/pdf/the-influence-of-sio2-sic-al-h2po4-3-coating-on-mechanical-s5ga3t8j.pdf

The Influence of SiO2 + SiC + Al (H2PO4)3 Coating on Mechanical and Dielectric Properties for SiCf/MWCNTS/AlPO4 Composites

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