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Preparation method of iron-silicon magnetic powder core

A magnetic powder core and iron-silicon technology, which is applied in the field of preparation of iron-silicon magnetic powder cores, can solve the problems of poor binding ability between inorganic coating medium and magnetic powder particles, increase the complexity of the metal magnetic powder core process, and high brittleness, and achieve guaranteed performance. Effect of increasing effective permeability and reducing residual stress

Pending Publication Date: 2021-12-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned inorganic coating medium has poor binding ability with magnetic powder particles, high brittleness, and is easy to break during the pressing process.
The use of organic / inorganic composite coating can improve the poor heat resistance of organic media and the poor pressing performance of inorganic media to a certain extent, but the composite coating greatly increases the process complexity of metal magnetic powder cores.

Method used

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  • Preparation method of iron-silicon magnetic powder core
  • Preparation method of iron-silicon magnetic powder core
  • Preparation method of iron-silicon magnetic powder core

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a method for preparing an iron-silicon magnetic powder core, comprising the following steps:

[0031] (1) The iron-silicon spherical powder is prepared by a gas atomization process, the parameters of the gas atomization process are: the atomization pressure is 6 MPa, and the atomization temperature is 1580 ° C; the particle size of the iron-silicon spherical powder is: D 10 = 12.7 μm, D 50 = 31.5 μm, D 90 =68.5 μm; In terms of mass fraction, the Si content in the iron-silicon spherical powder is 6.5% of the total mass;

[0032] (2) Add the iron-silicon spherical powder prepared in step (1) to the mixture of silicone resin and acetone and mix evenly, then ultrasonically stir until dry to obtain an insulating-coated composite magnetic powder; silicone resin, acetone and iron-silicon The mass ratio of the spherical powder is silicone resin: acetone: silicon spherical powder = 0.5:1:100;

[0033] (3) uniformly distribute the composite magnetic po...

Embodiment 2

[0036] This embodiment provides a method for preparing an iron-silicon magnetic powder core, comprising the following steps:

[0037](1) The iron-silicon spherical powder is prepared by a gas atomization process, the parameters of the gas atomization process are: the atomization pressure is 6 MPa, and the atomization temperature is 1580 ° C; the particle size of the iron-silicon spherical powder is: D 10 = 12.7 μm, D 50 = 31.5 μm, D 90 =68.5 μm; In terms of mass fraction, the Si content in the iron-silicon spherical powder is 6.5% of the total mass;

[0038] (2) Add the iron-silicon spherical powder prepared in step (1) to the mixed solution of silicone resin and organic solvent and mix evenly, then ultrasonically stir until dry to obtain an insulating-coated composite magnetic powder; silicone resin, organic solvent and The mass ratio of iron-silicon spherical powder is silicone resin:organic solvent:silicon spherical powder=1.0:1:100;

[0039] (3) uniformly distribute the...

Embodiment 3

[0042] This embodiment provides a method for preparing an iron-silicon magnetic powder core, comprising the following steps:

[0043] (1) The iron-silicon spherical powder is prepared by a gas atomization process, the parameters of the gas atomization process are: the atomization pressure is 6 MPa, and the atomization temperature is 1580 ° C; the particle size of the iron-silicon spherical powder is: D 10 = 12.7 μm, D 50 = 31.5 μm, D 90 =68.5 μm; In terms of mass fraction, the Si content in the iron-silicon spherical powder is 6.5% of the total mass;

[0044] (2) Add the iron-silicon spherical powder prepared in step (1) to the mixed solution of silicone resin and organic solvent and mix evenly, then ultrasonically stir until dry to obtain an insulating-coated composite magnetic powder; silicone resin, organic solvent and The mass ratio of iron-silicon spherical powder is silicone resin:organic solvent:silicon spherical powder=0.25:1:100;

[0045] (3) uniformly distribute t...

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Abstract

The invention discloses a preparation method of an iron-silicon magnetic powder core, which belongs to the field of magnetic materials. The method comprises the following steps of (1) preparing iron-silicon spherical powder by adopting a gas atomization process, (2) adding the iron-silicon spherical powder prepared in the step (1) into a mixed solution of silicone resin and an organic solvent, uniformly mixing, and then ultrasonically stirring until the mixture is dried to obtain insulation coated composite magnetic powder, (3) putting the composite magnetic powder obtained in the step (2) into a mold, and performing compression molding to obtain a pressed blank of the iron-silicon magnetic powder core, and (4) enabling the pressed blank of the iron-silicon magnetic powder core obtained in the step (3) to be subjected to annealing treatment under the vacuum degree of 2-8*10<-3> Pa and the annealing temperature of 700-800 DEG C, and acquiring the iron-silicon magnetic powder core. According to the preparation method disclosed by the invention, the effective magnetic conductivity of the iron-silicon magnetic powder core can be remarkably improved, and the power loss is reduced; the method is simple, feasible, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing an iron-silicon magnetic powder core, belonging to the field of magnetic materials. Background technique [0002] Soft magnetic composite (Soft magnetic composite, SMC) or magnetic powder core has the characteristics of three-dimensional magnetic isotropy, high resistivity, and low high-frequency eddy current loss, and is the key basic material for the preparation of electronic components (inductors). According to the magnetic components, metal magnetic powder cores can be divided into Fe, Fe-Si, Fe-Ni, Fe-Si-Al, Fe-Ni-Mo, amorphous, nanocrystalline magnetic powder cores, etc. The preparation process mainly includes soft magnetic Metal powder preparation, insulation coating, compression molding, annealing heat treatment, etc. FeSi magnetic powder core has the characteristics of high saturation magnetic induction, excellent DC superposition performance and low material cost. It is often used to prepare hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/147
CPCH01F41/0246H01F1/14766
Inventor 卢克超王健徐佳刘辛
Owner GUANGDONG INST OF NEW MATERIALS
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