Metal-ferrite composite magnetic material with core-shell structure and method of making same

By preparing core-shell structured metal-ferrite composite magnetic materials, the problem of high high-frequency eddy current loss was solved, the requirements for miniaturization and high-frequency operation of the materials were met, and the magnetic properties and mechanical properties were improved.

CN114171278BActive Publication Date: 2026-05-26KUNSHAN KADAM NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KUNSHAN KADAM NEW MATERIAL TECH CO LTD
Filing Date
2021-12-06
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing soft magnetic materials suffer from high eddy current losses at high frequencies, making it difficult to meet the requirements of miniaturization and high frequency operation. Furthermore, existing coating methods fail to form a dense core-shell structure, affecting magnetic properties and mechanical performance.

Method used

The metal-ferrite composite magnetic material with a core-shell structure is formed by high-temperature sintering to create a tight connection between the metal body, the bonding layer and the ferrite. The preparation method includes mixing, kneading, degreasing and high-temperature sintering to form a micro-unit structure in which the metal body encapsulates the ferrite.

Benefits of technology

It improves the saturation magnetic induction intensity and resistance of the material, reduces high-frequency eddy current loss, enhances mechanical strength, and has a high production yield and low cost.

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Abstract

The metal-ferrite composite magnetic material with a core-shell structure provided by this invention is composed of several core-shell structured micro-units. From the inside out, each micro-unit consists of a metal body, a bonding layer, and ferrite. The metal body has a lower melting point than the ferrite, and the bonding layer is formed by high-temperature sintering of the metal body and ferrite at their contact surfaces. The bonding layer surrounds the outside of the metal body, and the ferrite surrounds the outside of the bonding layer. The bonding layers in adjacent micro-units are independent, while the ferrite in all micro-units is interconnected. This design utilizes the metal body to increase the saturation magnetic induction intensity of the material, suitable for miniaturization requirements. It also utilizes the ferrite to increase the resistivity and reduce eddy current losses. Furthermore, the bonding layer firmly connects the metal body and ferrite, improving the material's mechanical properties and enhancing the mechanical strength of the finished product. The manufacturing method provided by this invention has a high yield rate, low cost, and is easy to implement.
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