Microwave absorption properties of carbon fiber radar absorbing coatings prepared by water-based technologies

Abstract

a Carbon fiber radar absorbing coatings (CFRACs), composed of different amounts of carbon fiber (CF) embedded in polyurethane resin, were prepared using water-based technologies. The microstructures and properties of the coatings were characterized by means of scanning electron microscopy, differential scanning calorimetry, Fourier infrared spectrometry, X-ray diffraction analysis, and vector network analysis. Our results show that with an increase in CF content and thickness of coating, the peak reflection of the CFRAC moved in the low frequency direction. When the CF content was 0.8 wt% and the thickness of the coating was 1.2 mm, the maximum reflection losses of the coatings were À11.01 dB over the frequency range of 8-18 GHz, with a less than À10 dB (over 90% microwave absorption) bandwidth of nearly 4.2 GHz and a coating density of 1.02 kg m À2. The results indicated that CFRACs could be a potential microwave absorbing material used over the frequency range of 8-18 GHz.

Nano‐MgO prepared via templating on biodegradable filter paper

“…As the temperature exceeded 500 • C, the mass did not further decrease, which indicates that the precursor Mg(CH 3 COO) 2 ⋅4H 2 O completely decomposed into MgO. For filter paper, the weight loss in the temperature range from 30 to 100 • C was not obvious, which may be caused by the evaporation of absorbed CO 2 and H 2 O [19]. From 100 to 500 • C, the filter paper template gradually decomposed into CO 2 and H 2 O.…”

Carbon‐Based Radar Absorbing Materials toward Stealth Technologies

“…Due to these properties, CFs are widely used in many applications, including electromagnetic absorber materials. [84,85] In this regard, a significant amount of work has been performed on CF-reinforced polymer composites (CFRPs) and CF/magnetic nanoparticles.…”

Recent progress in microwave absorption of nanomaterials: composition modulation, structural design, and their practical applications

“…The corresponding absorption mechanism is conductance loss, dielectric loss, and magnetic loss, respectively. For nano‐conductive materials applied in wave absorption area, considerable research has been devoted to various carbon materials, such as carbon black [31], carbon nanotubes [32], carbon fibres [33], graphene [34], and so on. Besides, in recent studies, many researchers have introduced conductive polymers [like polypyrrole [35], polyaniline [36], polythiophene [37], poly (3,4‐ethylenedioxythiophene) [38] etc.]…”