Hard Carbon Embedded with FeSiAl Flakes for Improved Microwave Absorption Properties

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Carbon-based composites are effective microwave absorbers.
• Magnetic hard carbon (HC)-based composites are understudied for microwave absorption applications.

Purpose of the Study:

• To synthesize and characterize FeSiAl@HC composites for enhanced microwave absorption.
• To investigate the structure-property relationships of FeSiAl@HC composites.

Main Methods:

• Pyrolysis of FeSiAl flakes and phenolic resin (PR) to create FeSiAl@HC.
• Modification of microstructures by altering the FeSiAl/PR mass ratio.
• Evaluation of magnetic properties, functional groups, thermal stability, and microwave absorption.

Main Results:

• FeSiAl@HC composites exhibited a layered structure with tunable magnetic properties.
• Optimal composite achieved a minimum reflection loss of -36.1 dB.
• Effective absorption bandwidth reached up to 11.7 GHz.

Conclusions:

• FeSiAl@HC composites demonstrate significant potential for practical microwave absorption applications.
• The synthesis approach offers new insights into developing magnetic HC-based composites.