2 / 17 type rare earth soft magnetic / Fe-based soft magnetic laminated composite material and preparation method thereof

By employing an insulating coating and periodic stacking design process, the challenge of optimizing the performance of Fe-based soft magnetic materials and 2:17 type rare earth soft magnetic materials at high frequencies was solved, enabling the preparation of soft magnetic composite materials with high permeability and high cutoff frequency, suitable for high-frequency magnetic components.

CN121394155APending Publication Date: 2026-01-23ZHEJIANG UNIV
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Patent Information

Application Number
CN202511522850.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-23
Publication Date
2026-01-23

AI Technical Summary

Technical Problem

Existing technologies struggle to balance the high permeability of Fe-based soft magnetic materials and the high cutoff frequency of 2:17 type rare earth soft magnetic materials at high frequencies. Traditional physical mixing methods for magnetic powders are also difficult to achieve effective integration of the two types of materials, which limits the optimization of magnetic properties.

Method used

By employing a process of magnetic powder pretreatment, polyurethane mixing, thin ring green preparation, alternating stacking, and hot pressing, and through insulating coating and periodic stacking design, a 2:17 type rare earth soft magnetic/Fe-based soft magnetic laminate composite material was prepared, achieving localized conductive unit segmentation and magnetic property optimization within the material.

Benefits of technology

A breakthrough was achieved in overcoming the performance inversion relationship between permeability and cutoff frequency at high frequencies, and a composite material with high permeability, low eddy current loss and high cutoff frequency was prepared, which is suitable for high-frequency high-performance magnetic components.

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Abstract

The invention discloses a 2: 17 type rare earth soft magnetic / Fe-based soft magnetic laminated composite material and a preparation method thereof. The method sequentially comprises the following steps: 1) screening 2: 17 type rare earth soft magnetic powder, performing insulation coating, mixing with polyurethane, and performing magnetic field orientation to obtain a thin ring green body; (2) Fe-based soft magnetic powder is sieved and mixed with polyurethane, and then a thin ring green body is obtained through magnetic field orientation; (3) alternately stacking the 2: 17 type rare earth soft magnetic thin ring green bodies and the Fe-based soft magnetic thin ring green bodies in the direction perpendicular to the plane of the thin ring green bodies; and 4) carrying out hot press molding on the laminated soft magnetic composite material. Based on the high-frequency characteristic of the 2: 17 type rare earth soft magnetic material and the high magnetic conductivity characteristic of the Fe-based soft magnetic material, collaborative optimization of the magnetic conductivity and the cut-off frequency is achieved within the ultra-wideband range from MHz to GHz, the problem that the magnetic conductivity of a traditional soft magnetic composite material is attenuated along with the frequency is effectively solved, high-frequency loss is greatly reduced, and the service life of the soft magnetic composite material is prolonged. And a solution is provided for high-frequency soft magnetic components (such as inductors and transformers) with high magnetic performance and low power consumption.
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