Preparing method of amorphous meal soft magnetic powder core

Abstract

The invention discloses a preparing method of an amorphous meal soft magnetic powder core. The preparing method includes the steps of 1, embrittling an amorphous strip, and crushing the amorphous strip embrittled to obtain amorphous metal powder; 2, screening the amorphous metal powder, and performing particle size matching; 3, subjecting the matched amorphous metal powder to passivation; 4, subjecting the amorphous metal powder, passivated by phosphoric acid, to insulation coating; 5, adding binder, and granulating the amorphous metal powder coated; 6, subjecting the granulated amorphous metal powder to magnetic field orientation forming; 7, subjecting a magnetic core, subjected to orientation forming, to axial magnetic thermal treatment; and 8, cooling the magnetic core, subjected to axial magnetic thermal treatment, and performing spraying to obtain a product. The preparing method has the advantages that magnetic domain forms in the amorphous magnetic core, coercive force and loss are lowered, magnetic core loss is further reduced, magnetic conductivity is improved, soft magnetic property of the amorphous magnetic core is improved, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field related to the preparation of metal magnetic powder cores, in particular to a preparation method of an amorphous metal soft magnetic magnetic powder core. Background technique [0002] Metal magnetic powder core is a new type of soft magnetic material after silicon steel, ferrite, and amorphous strip, and is widely used in power electronic devices. Traditional metal magnetic powder cores mainly include iron powder cores, sendust, iron silicon, iron nickel molybdenum, iron nickel, etc., but they have their own shortcomings, such as poor superposition performance of sendust, poor loss performance of iron powder cores, iron nickel And iron-nickel-molybdenum has better performance, but its composition contains a higher proportion of nickel, which requires higher manufacturing costs. Therefore, it is necessary to develop a magnetic powder core with lower cost and better performance. Amorphous magnetic powder cor...

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Problems solved by technology

[0003] The Chinese patent "A Preparation Method for Amorphous Metal Soft Magnetic Powder Core", Patent No. CN104190945A, introduces a preparation technology for amorphous magnetic powder core, which adopts isostatic pressing technology to improve the density of the magnetic core, thereby There are some defects in this method to improve the magnetic permeability of the magnetic core. On the one hand, before the heat treatment of the amorphous magnetic powder core, the strength of the magnetic core is low because the binder has not been cured. rate; on the other hand, isostatic pressing requires a soft sheath, which increases the cost, is not suitable for mass production, and limits the use

[0004] The Chinese patent "A Heat Treatment Method for Amorphous Magnetic Powder Core", Patent No. CN103658642A, introduces a heat treatment technology for amorphous magnetic powder cores, which adopts transverse magnetic treatment, and the magnetic field passes through the magnetic ring surface vertically. Although this method has certain Loss reduction effect, but it uses a large magnetic field with a strength of 1000-3000Gs, which requires a large magnetic field to drive the magnetic domain orientation, resulting in an increase in the cost of heat treatment and an increase in the cost of the magnetic core; and the arrangement of the magnetic powder is disorderly and disorderly. Transverse magnetic effect is not obvious