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Ultrawide Spectra Camouflage Coatings from Metallic Flake Powder.

Siqi Fu1, Zudian Liang2, Xing Qian3

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

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|May 20, 2024
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Summary
This summary is machine-generated.

A new ultrawide spectra camouflage material using carbon nanotubes on porous alumina and aluminum flakes offers low reflection in visible light, low emissivity in infrared, and high microwave absorption for enhanced military applications.

Keywords:
bioinspired structureinfrared emissivitymicropowder anodic oxidationmicrowave absorptionultrawide spectra camouflagevisible omnidetectability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Military Science

Background:

  • Advanced multispectral detectors necessitate ultrawide spectra camouflage materials for military and national security.
  • Existing camouflage technologies face challenges due to conflicting spectral requirements across different bands.
  • Sophisticated multispectral detectors are continuously advancing, increasing the need for effective camouflage solutions.

Purpose of the Study:

  • To demonstrate a novel ultrawide spectra camouflage material compatible with visible, infrared, and microwave bands.
  • To address the limitations of current camouflage materials by achieving simultaneous low reflectance, low emissivity, and high microwave absorption.
  • To develop a material with potential applications in multispectral manipulation, electromagnetic signal processing, and thermal management.

Main Methods:

  • Fabrication of a composite material: carbon nanotubes adsorbed on porous anodic alumina/aluminum flake powder (CNTs@PAA/AFP).
  • Bioinspired design utilizing porous alumina for low visible reflection and aluminum flake powder for low infrared emissivity.
  • Loading carbon nanotubes onto porous alumina for enhanced microwave absorption.

Main Results:

  • The CNTs@PAA/AFP material exhibits omnidirectional low reflectance (average R = 0.29) and high grayscale (72%) in the visible spectrum (400-800 nm).
  • It demonstrates low emissivity in the infrared atmospheric windows (ε3-5μm = 0.15, ε8-14μm = 0.18), reducing infrared lock-on range by up to 59.6%.
  • High microwave absorption (minimum RL = -42.46 dB) and effective absorption bandwidth (EAB = 7.43 GHz) were achieved in the S-Ku bands (2-12 GHz).

Conclusions:

  • The developed CNTs@PAA/AFP material effectively provides ultrawide spectra camouflage across visible, infrared, and microwave frequencies.
  • The bioinspired structural design and material composition offer significant improvements in camouflage performance compared to existing technologies.
  • This research presents a promising approach for developing advanced materials for defense and other applications requiring multispectral control.