Magnetic carbon foam with multiple electromagnetic loss mechanisms and preparation method thereof

Magnetic carbon foam is prepared through high-temperature carbonization and hydrothermal reaction, and a variety of electromagnetic loss mechanisms are integrated, which solves the problem of excessive thickness of existing wave absorbing materials, and effectively absorbs wide-band electromagnetic waves at thin thickness, meeting the needs of miniaturization and integration of electronic equipment.

CN119726149APending Publication Date: 2025-03-28THE RES INST FOR SPECIAL STRUCTURES OF AERONAUTICAL COMPOSITE AVIC
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Patent Information

Application Number
CN202411828050.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-12
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

Due to the single loss mechanism of existing absorber materials, the thickness of the absorber is too large, and they cannot meet the design goals of "thin, light, wide and strong" at the same time, and it is difficult to efficiently eliminate electromagnetic wave interference in a narrow space.

Method used

Magnetic carbon foam is prepared by two-step methods of high-temperature carbonization and hydrothermal reaction. The composition-structure synergy strategy is used to realize the combination of the three-dimensional network structure of the carbon foam and the iron tetroxide shell, integrating the conductivity loss, magnetic loss and non-intrinsic magnetic loss mechanisms to improve the electromagnetic loss capability.

Benefits of technology

It realizes the wide-frequency wave absorption characteristics under thinner thickness, effectively absorbs electromagnetic waves in the range of 10.8-18.0GHz, reduces the thickness of the absorber, meets the needs of miniaturization and integration of electronic equipment, and has a simple preparation process and low cost, which is suitable for large-scale industrial production.

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Abstract

The invention belongs to the technical field of wave-absorbing materials, and relates to magnetic carbon foam with multiple electromagnetic loss mechanisms and a preparation method thereof.The magnetic carbon foam comprises a carbon foam matrix and a ferroferric oxide shell layer growing on the surface of the carbon foam matrix in situ; according to the magnetic carbon foam prepared by a two-step method of high-temperature carbonization and hydrothermal reaction, the compounding of a conductive loss type material and a magnetic loss type material is successfully realized, and while the impedance matching characteristic of the foam is improved, loss mechanisms such as intrinsic conductive loss and magnetic loss are integrated; in addition, a novel extrinsic magnetic loss mechanism and an inverse frequency dispersion effect are induced based on component-structure design, and the electromagnetic wave attenuation capability of the foam is greatly improved.
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