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Metal magnetic powder core, preparation method and application thereof

A magnetic powder core and metal technology, which is applied in the manufacture of magnetic cores, magnetic cores/yokes, inductors/transformers/magnets, etc., can solve problems such as uneven distribution, poor insulation effect, etc., to ensure insulation effect and good insulation effect And high temperature resistance, reduce the effect of eddy current loss

Pending Publication Date: 2021-12-03
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the disclosed method does not use an organic binder, it can avoid the adhesive discharge problem caused by the heat generation of the metal soft magnetic powder core during use, but the inorganic insulating binder is only attached to the powder surface by physical adsorption, and the During the process, the inorganic insulating binder is unevenly distributed on the surface of the soft magnetic metal powder, and the insulating effect is poor.

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  • Metal magnetic powder core, preparation method and application thereof
  • Metal magnetic powder core, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0044] This embodiment provides a metal magnetic powder core, the surface of the powder particles of the metal magnetic powder core is covered with a passivation layer and an alumina insulating layer, and the preparation method of the metal magnetic powder core includes the following steps:

[0045] (1) stirring and mixing gas atomized iron-silicon-aluminum (FeSiAl-85-9.5-5.5, brand: sendust) powder, phosphoric acid and water to obtain slurry for 5 minutes; the average particle size of the gas-atomized iron-silicon aluminum powder is 50 μm, The addition amount of the phosphoric acid is 1.5 wt% of the aerosolized iron-silicon-aluminum powder, and the addition amount of the water is 5 wt% of the aerosolized iron-silicon-aluminum powder;

[0046] (2) After stirring and mixing the aluminum hydroxide gel with a solid content of 25wt% and the slurry described in step (1) for 5 minutes, drying at 200° C. for 2 hours in turn, and passing through a 70-mesh sieve; the addition of the alu...

Embodiment 2

[0049] This embodiment provides a metal magnetic powder core, the surface of the powder particles of the metal magnetic powder core is covered with a passivation layer and an alumina insulating layer, and the preparation method of the metal magnetic powder core includes the following steps:

[0050] (1) stirring and mixing gas atomized iron-nickel (FeNi-50-50, brand: High-Flux) powder, chromic acid and water for 10min to obtain slurry; the average particle size of the gas-atomized iron-nickel powder is 75 μm, so The addition amount of the chromic acid is 2wt% of the aerosolized iron-nickel powder, and the addition amount of the water is 7.5wt% of the aerosolized iron-nickel powder;

[0051] (2) After stirring and mixing the aluminum hydroxide gel with a solid content of 20wt% and the slurry described in step (1) for 3 minutes, drying at 150° C. for 2.5 hours in turn, and passing through a 50-mesh sieve; The addition amount is 1wt% of the aerosolized iron-nickel powder;

[005...

Embodiment 3

[0054] This embodiment provides a metal magnetic powder core, the surface of the powder particles of the metal magnetic powder core is covered with a passivation layer and an alumina insulating layer, and the preparation method of the metal magnetic powder core includes the following steps:

[0055] (1) stirring and mixing water-atomized iron-nickel-molybdenum (Fe-Ni-Mo-17-81-2, brand: MPP) powder, aluminum dihydrogen phosphate and water for 3 minutes to obtain a slurry; the water-atomized iron-nickel-molybdenum powder The average particle size of the aluminum dihydrogen phosphate is 25 μm, the addition amount of the aluminum dihydrogen phosphate is 1wt% of the water atomized iron-nickel-molybdenum powder, and the addition amount of the water is 2.5wt% of the water-atomized iron-nickel-molybdenum powder;

[0056] (2) After stirring and mixing the aluminum hydroxide gel with a solid content of 30wt% and the slurry described in step (1) for 10 minutes, drying at 250° C. for 1.5 h...

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Abstract

The invention provides a metal magnetic powder core, a preparation method and application thereof. The preparation method comprises the steps that metal magnetic powder and a passivator are mixed to form slurry; after aluminum hydroxide gel and the slurry are mixed, drying and sieving are conducted in sequence; and mixing the lubricating powder with the sieved powder, carrying out compression molding, and then carrying out heating treatment to obtain the metal magnetic powder core. The method comprises the following steps: passivating the surfaces of metal magnetic powder particles by using a passivating agent, then adding aluminum hydroxide gel, and reacting the passivating agent and the aluminum hydroxide gel on the surfaces of the metal magnetic powder particles to generate an aluminum oxide insulating layer. The metal magnetic powder core provided by the invention has relatively good insulation effect and high temperature resistance, and the insulation effect among the metal magnetic powder particles is ensured, so that the eddy current loss is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and relates to a magnetic powder core, in particular to a metal magnetic powder core and a preparation method and application thereof. Background technique [0002] Metal magnetic powder cores have high saturation magnetic field strength and soft-pack characteristics, which can be used to reduce the volume of magnetic core devices, but their resistivity is low. Therefore, reducing the eddy current loss has become the key to solving the application of metal magnetic powder cores in high frequency circuits. One of the effective methods to reduce eddy current loss is to insulate the surface of metal magnetic powder particles. [0003] There are two existing methods of insulating coating. One is to passivate the insulation with a simple acid solution, for example, using an acid solution such as phosphoric acid and chromic acid for passivation treatment. The other is to add organic resin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F3/08
CPCH01F3/08H01F41/0206
Inventor 申建伟厉超群包宇航金王滔张晏卢娟
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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