All-metallic iron-based nanocrystalline soft magnetic alloy, preparation method thereof and magnetic core

By using an all-metal Fe-Co-MN-Cu nanocrystalline alloy system and optimized heat treatment process, the problem of uneven heat treatment of iron-based nanocrystalline soft magnetic alloys with high iron content was solved, achieving high saturation magnetic induction intensity and high temperature thermal stability, thus expanding its application in high-frequency power electronic devices.

CN115732160BActive Publication Date: 2026-03-27JIANGSU YUMAO NANO TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202211627523.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-16
Publication Date
2026-03-27
Estimated Expiration
2042-12-16

AI Technical Summary

Technical Problem

Existing iron-based nanocrystalline soft magnetic alloys suffer from uneven heat treatment and low and uneven nanocrystal precipitation under high iron content conditions, resulting in low saturation magnetic induction and poor soft magnetic properties, which limits their application in high-frequency power electronic devices.

Method used

Using an all-metal Fe-Co-MN-Cu nanocrystalline alloy system, M = Zr, Hf, Nb; N = Li, Be, with an iron content of 85-90%, a balance between amorphous formation ability and soft magnetic properties was ensured by optimizing the element ratio and heat treatment process, and body-centered cubic α-Fe(Co) nanocrystals were prepared and subjected to crystallization heat treatment at 480-640℃.

Benefits of technology

It improves the saturation magnetic induction intensity and high-temperature thermal stability of the alloy, enhances the magnetic permeability and frequency stability at high frequencies, is suitable for high-frequency power electronic devices, reduces raw material costs and simplifies the preparation process.

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Abstract

The application provides a full-metal iron-based nanocrystalline soft magnetic alloy, which is processed by using full-metal raw materials and does not add non-metal elements; has an Fe-Co-M-N-Cu nanocrystalline alloy system, wherein M=Zr, Hf, Nb; N=Li, Be; the Fe-M-N-Cu system contains 85-90% of Fe. By using the technical scheme, the full-metal iron-based nanocrystalline soft magnetic alloy material is provided, which is a full-metal high-iron-content Fe-Co-M-N-Cu nanocrystalline alloy material, the structure of which comprises an amorphous matrix and nanocrystalline grains, the nanocrystalline grain phase is a body-centered cubic alpha-Fe(Co), and the average grain size is less than 12nm; the iron content is up to 90% and the material can also have high thermal stability and magnetic induction performance.
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