Organic film-coated soft magnetic powder, method for producing same, powder magnetic core, magnetic element, and electronic device

By forming an organic film on the surface of soft magnetic powder by coating it with an oxide film, and utilizing the hydrolysis and condensation reactions of a specific coupling agent, the problems of flowability and compatibility with adhesive resin were solved, resulting in high-density and mechanically stable pressed powder.

CN122455504APending Publication Date: 2026-07-24SEIKO EPSON CORP
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Patent Information

Application Number
CN202610075627.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-01-22
Filing Date
2026-01-20
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, there are difficulties in balancing the flowability and compatibility with the adhesive resin when coating soft magnetic powder with insulating material, resulting in large deviations in the strength of the pressed powder.

Method used

An organic film is formed by coating the surface of soft magnetic powder with an oxide film. This is achieved by using a coupling agent with amino, hydrolyzable groups, and straight-chain alkyl groups. The amount of coupling agent added is controlled within a specific range to ensure flowability and compatibility with the adhesive resin.

Benefits of technology

This method achieves pressed powder with excellent flowability and stable strength, improves the mechanical strength and density of pressed powder, and reduces strength deviation.

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Abstract

Provided are: an organic film-coated soft magnetic powder with which it is possible to produce a powder compact having excellent fluidity and compatibility with a binder resin and having little variation in strength; a method for producing the organic film-coated soft magnetic powder; a powder magnetic core and a magnetic element comprising the organic film-coated soft magnetic powder; and an electronic device provided with the magnetic element. An organic film-coated soft magnetic powder having: an oxide film-coated soft magnetic powder having a soft magnetic powder and an oxide film containing an oxide of an element contained in a soft magnetic metal material; and an organic film containing a compound derived from a coupling agent having an amino group, a hydrolyzable group, and a linear alkyl group, the organic film having an average particle diameter of 10.0-30.0 [mu] m (inclusive) on a volume basis, and the average particle diameter of the organic film being less than or equal to 10.0 [mu] m (inclusive) when CS is the minimum coating area [m2 / g] of the coupling agent and Sm is the specific surface area [m2 / g] of the oxide film-coated soft magnetic powder. The actual addition amount (mass%) of the coupling agent is 2.0-5.0 times (inclusive) the theoretical addition amount (CA) (mass%) of the coupling agent as determined by the following formula. CA = Sm / CS * 100.
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