Preparation method of iron-nickel magnetic powder core material

CN115424849BActive Publication Date: 2026-05-26HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HENGDIAN GRP DMEGC MAGNETICS CO LTD
Filing Date
2022-09-21
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing methods for preparing iron-nickel magnetic powder cores, passivating agents such as phosphoric acid readily react with iron, leading to a decrease in magnetic permeability. Furthermore, organic solvents increase carbon content, hindering the improvement of magnetic permeability and saturation characteristics.

Method used

An organic coating layer is formed using an organic coating agent in a primary coating process, followed by a secondary coating process using a water-soluble inorganic coating agent, combined with an adhesive, to form a stable insulating layer to enhance magnetic properties.

Benefits of technology

It effectively improves the resistivity and saturation characteristics of iron-nickel magnetic powder cores, reduces carbon content, increases inductance, and maintains high saturation characteristics under different currents. Grain boundary bonding and density are also improved.

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Abstract

This invention relates to a method for preparing a nickel-iron magnetic powder core material. The method includes the following steps: (1) mixing nickel-iron powder and an organic coating agent for a primary coating treatment, followed by drying and annealing to obtain primary passivated nickel-iron powder; (2) mixing the primary passivated nickel-iron powder obtained in step (1) with an aqueous solution of an inorganic coating agent for a secondary coating treatment, followed by drying to obtain secondary passivated nickel-iron powder; (3) mixing the secondary passivated nickel-iron powder obtained in step (2) with a binder, followed by granulation, baking, and pressing to obtain the nickel-iron magnetic powder core material. The preparation method provided by this invention can form an excellent coating effect on the surface of nickel-iron powder, and the coating layer has a stable structure, effectively reducing the introduction of carbon content and further improving the inductance and saturation characteristics of the nickel-iron magnetic powder core material.
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