Preparation method of high-performance soft magnetic composite material and magnetic ring

Abstract

The invention discloses a preparation method of a high-performance soft magnetic composite material and a magnetic ring. The preparation method comprises the following steps: coating spherical soft magnetic alloy particles with an insulating layer to form mixed powder; putting the mixed powder into a mold to press and mold the mixed powder; applying an external magnetic field to the mixed powder in the forming process, the magnetic field being parallel to a working magnetic circuit plane and perpendicular to the normal direction of the working magnetic circuit plane; and carrying out stress relief annealing to obtain the soft magnetic composite material. The technical scheme is very simple and convenient, has no strict requirements on magnetic powder and equipment, and can realize high performance. The non-magnetic phases are asymmetrically distributed in a continuous chain shape along the direction of an external magnetic field, so that the magnetic resistance and loss of a horizontalmagnetic circuit are reduced. The magnetic phases are asymmetrically distributed and are closely and orderly arranged along the direction of an external magnetic field, and fine magnetic particles preferentially fills an air gap in the plane direction of the magnetic ring, so that the magnetic resistance and loss of the horizontal magnetic circuit are reduced. High magnetic conductivity and low loss are achieved. The method has the advantages of less equipment, less process steps and simple process, and can quickly implement industrial application of the soft magnetic composite material.

Description

technical field [0001] The invention relates to the field of magnetic material preparation, in particular to a preparation method of a high-performance soft magnetic composite material and a magnetic ring thereof. Background technique [0002] Soft magnetic composite materials have high magnetic flux and low loss soft magnetic composite materials, also known as magnetic powder cores in the industrial field. The resistivity of soft magnetic composite materials is higher than that of metal soft magnets, so the magnetic loss is low; its saturation magnetization is higher than that of ferrite, so the power density is high. Soft magnetic composite materials have unique advantages and application ranges. [0003] The soft magnetic composite material is to insulate and coat the magnetic particles. After the organic material and the inorganic material are insulated and coated, the powder metallurgy technology is used to make the mixed powder into an isotropic bulk material. The sof...

AI Technical Summary

Problems solved by technology

Therefore, isotropy actually causes a waste of magnetic properties of soft magnetic composites

In order to increase the magnetic permeability, the thickness of the non-magnetic insulating layer can be reduced, but this will reduce the resistivity and increase the eddy current loss; in order to reduce the loss, the resistivity of the soft magnetic alloy can be increased to increase the thickness of the insulating layer, but this will make the magnetic Conductivity and saturation magnetization decrease

Therefore, it is difficult for isotropic soft magnetic composite materials to meet the requirements of high magnetic permeability, high saturation magnetization, and low loss at the same time. The performance improvement on the one hand usually sacrifices the performance on the other.

[0004] However, the technical means used in the prior art to increase the magnetic permeability or reduce the loss usually improve the performance in all directions at the same time, resulting in a waste of magnetic performance in the non-working magnetic circuit direction to a certain extent.

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