Preparation method of cobalt-based composite particles with adjustable multilayer structure

Cobalt-based composite particles designed with a multi-layer structure use a coating process of cobalt and silicon oxide to solve the problem of insufficient reflection attenuation of single-layer particles, achieve efficient microwave absorption in specific frequency bands, and meet the stable operation requirements of high-tech equipment.

CN116689757BActive Publication Date: 2025-10-03BEIJING INST OF TECH
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Patent Information

Application Number
CN202310696112.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-13
Publication Date
2025-10-03
Estimated Expiration
2043-06-13

AI Technical Summary

Technical Problem

In the existing technology, magnetic particles with a single-layer hollow structure have limited effect on the reflection and attenuation of electromagnetic waves, making it difficult to meet the stable operation requirements of high-tech equipment for microwave absorbing materials, and cannot effectively absorb specific frequency bands.

Method used

Cobalt-based composite particles with a multi-layer structure design are prepared by adjusting the gaps between each layer and combining the coating process of cobalt and silicon oxide to enhance the multiple attenuation and reflection loss of electromagnetic waves.

Benefits of technology

It achieves excellent microwave absorption performance and can absorb specific frequency bands, thereby improving the microwave loss performance of the material and ensuring the stable operation of the equipment.

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Abstract

The present invention discloses a method for preparing cobalt-based composite particles with adjustable multilayer gaps, comprising the following steps: first, preparing a Co core; second, coating with SiO2; third, coating with Fe; fourth, coating with Co; and fifth, removing the Fe intermediate layer. This method utilizes structural design of the particles to increase the material's microwave absorption loss, resulting in composite particles with excellent microwave absorption properties. Furthermore, the gaps between the spherical shells can be tailored to the microwave frequency range in which the material is intended to operate, achieving enhanced absorption and effectively improving the material's microwave absorption loss performance.
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