Soft magnetic powder and magnetic core

By using Fe and Co soft magnetic powders with specific compositions and particle size ranges, combined with mechanochemical reduction and mixing of large-diameter and small-diameter powders, the problems of high relative permeability and DC superposition characteristics of magnetic cores were solved, and the manufacturing of coil components with high inductance and good DC superposition characteristics was realized.

CN117120180BActive Publication Date: 2026-06-05TDK CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TDK CORP
Filing Date
2022-02-25
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies make it difficult to manufacture magnetic cores with high relative permeability and high DC superposition characteristics.

Method used

The magnetic core is manufactured using soft magnetic powder containing Fe and Co, with a total Fe and Co content of 90% or more by mass, an Fe content of 30% or more and 95% by mass, an average particle size of 0.10 μm or more and 5.0 μm, an oxygen content on the surface of 0.010 g/m2 or less, and a true density of 90% or more and 99% or less. The powder is reduced by a mechanochemical reduction method to prevent agglomeration. The large-diameter powder and the small-diameter powder are mixed to manufacture the magnetic core.

Benefits of technology

The filling rate and relative permeability of the magnetic core were improved, while the DC superposition characteristics and saturation magnetization were enhanced, meeting the requirements of coil components with high inductance and good DC superposition characteristics.

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Abstract

[Technical problem] The present application provides a soft magnetic powder for manufacturing a magnetic core having high relative permeability and high DC superposition characteristics. [Solution means] The present application provides a soft magnetic powder containing Fe and Co. The total content of Fe and Co is 90 mass% or more with respect to the entire soft magnetic powder. The content of Fe is 30 mass% or more and 95 mass% or less with respect to the total content of Fe and Co. The average particle diameter of the soft magnetic powder is 0.10 μm or more and 5.0 μm or less. The oxygen amount on the surface of the soft magnetic powder is 0.010 g / m 2 2 or less. The true density of the soft magnetic powder is 90% or more and 99% or less with respect to the theoretical density of the soft magnetic powder.
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