Amorphous nanocrystalline magnetic powder core preparation method based on hot pressing process

By using hot pressing process and high-temperature coating solvent in the preparation of amorphous nanocrystalline magnetic powder cores, the problems of low molding density and low magnetic permeability in traditional methods are solved, higher density and magnetic permeability are achieved, and mold life is extended.

CN120072501APending Publication Date: 2025-05-30DAYOU SCIENTFIC & TECHNICAL CO LTD
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Patent Information

Application Number
CN202510157771.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-13
Publication Date
2025-05-30

AI Technical Summary

Technical Problem

In traditional preparation methods, amorphous or nanocrystalline soft magnetic powder core molding density is low, magnetic permeability is low, and high-pressure forming is not conducive to the mold life, which easily damages the insulating layer and increases magnetic loss.

Method used

Using a preparation method based on the hot pressing process, the metal powder and phosphoric acid are passivated and added to an organic coating solvent with high temperature resistance and stirred evenly to obtain surface-covered metal soft magnetic powder, followed by hot pressing and annealing to avoid damage to the mold by high pressure and damage to the insulating layer.

Benefits of technology

It effectively improves the density and magnetic permeability of the amorphous nanocrystalline magnetic powder core, extends the service life of the mold, and avoids the increase in magnetic loss.

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Abstract

The invention provides an amorphous nanocrystalline magnetic powder core preparation method based on a hot pressing process, which comprises the following steps: passivating metal powder and phosphoric acid, adding the passivated metal powder and phosphoric acid into an organic coating solvent, and uniformly stirring to obtain surface-coated metal soft magnetic powder, the organic coating solvent is organic silicon resin with phenyl groups; carrying out hot press molding on the surface-coated metal soft magnetic powder to obtain a metal soft magnetic composite material magnetic core; the metal soft magnetic composite material magnetic core is subjected to annealing treatment to obtain the metal soft magnetic core with better compactness and magnetic conductivity, specifically, organic silicon resin with phenyl groups is adopted as a coating solvent, and the problem of coating failure can be effectively avoided when an amorphous nanocrystalline magnetic powder core is subjected to hot pressing; the low-pressure forming process is adopted, the situation that the service life of the mold is affected due to too large pressure is avoided, meanwhile, due to the adoption of the low-pressure forming process, an insulating layer on the surface of the magnetic powder cannot be damaged, and magnetic loss of the magnetic powder core is prevented from rising.
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