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We developed a microwave molten salt carbon diffusion strategy for high-performance electromagnetic wave (EMW) absorbers. This method creates unique gradient core-shell structures for efficient EMW loss and thermal insulation, ideal for stealth applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Surface/interface engineering is crucial for high-performance electromagnetic wave (EMW) absorption materials.
  • Developing advanced EMW absorbers requires novel material design strategies.

Purpose of the Study:

  • To present a universal microwave molten salt carbon diffusion control strategy for EMW absorption.
  • To engineer three-dimensional multilayered gradient core-shell structures for enhanced EMW loss.

Main Methods:

  • Utilized microwave molten salt carbon diffusion for surface/interface engineering.
  • Promoted amorphous transformation and carbon diffusion on carbon fiber surfaces.
  • Formed Ti2AlC0.5N0.5 MAX-based gradient core-shell structures.

Main Results:

  • Achieved efficient reflection loss of -83.4 dB at 1.9 mm thickness.
  • Demonstrated effective isolation of internal radiant heat.
  • Created unique structures with cavities for incident and multiple EMW losses.

Conclusions:

  • The developed strategy offers a universal approach for modulating multilayered gradient structures in MAX phase ceramics.
  • The resulting material (TACN-1) shows significant potential for stealth applications due to its EMW absorption and thermal insulation properties.
  • This work advances diffusion-controlled surface/interface engineering for advanced material development.