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Precursor-Derived Mo2C/SiC Composites with a Two-Dimensional Sheet Structure for Electromagnetic Wave Absorption.

Yang Li1, Wen Yang2, Jipeng Zhang2

  • 1School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China.

Materials (Basel, Switzerland)
|April 24, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new molybdenum carbide/silicon carbide ceramic for microwave absorption. It overcomes limitations of traditional silicon carbide by reducing carbon content and enhancing absorption via a 2D structure.

Keywords:
Mo2C/SiCpolymer-derived ceramics (PDC)two-dimensional sheet structurewave absorption

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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Microwave Engineering

Background:

  • Precursor-derived silicon carbide (SiC) ceramics are effective microwave absorbers but suffer from residual carbon issues at high temperatures.
  • Applications in harsh environments like high-speed aircraft are limited by carbon content.

Purpose of the Study:

  • To develop a novel molybdenum carbide/silicon carbide (Mo2C/SiC) microwave-absorbing ceramic.
  • To address the limitations of residual carbon in SiC ceramics for high-temperature applications.
  • To enhance microwave absorption properties through a unique 2D sheet structure.

Main Methods:

  • Pyrolysis of polycarbosilane-coated molybdenum sulfide (PCS@MoS2) to form Mo2C/SiC composites.
  • Controlled reaction between MoS2 and free carbon during pyrolysis to reduce carbon content and form Mo2C.
  • Utilizing the layered structure of MoS2 to create a 2D composite architecture.

Main Results:

  • Mo2C/SiC ceramics were successfully synthesized with reduced carbon content.
  • A two-dimensional composite structure was achieved, significantly enhancing microwave absorption.
  • Minimum reflection loss (RLmin) of -46.49 dB at 8.96 GHz with a thickness of 2.6 mm was recorded.
  • Effective absorption bandwidth (EAB) covered the entire X-band (8-12 GHz).

Conclusions:

  • The novel Mo2C/SiC ceramic effectively mitigates residual carbon issues in SiC absorbers.
  • The 2D sheet structure derived from MoS2 significantly boosts microwave absorption performance.
  • This material shows great promise for high-temperature microwave absorption applications.