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Magnetically soft alloy composite material and preparation method thereof

A composite material and soft magnetic alloy technology, which is applied in the manufacture of permanent magnets, the magnetism of inorganic materials, and the manufacture of inductors/transformers/magnets. The effect of improving the strength of the magnet and reducing the loss

Active Publication Date: 2021-12-31
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this material mainly reduces the frictional resistance between materials by phosphating and adding lubricants, increases the molding density of the material, and improves the strength of the magnet. However, the bonding strength of the powder relying on the interlocking force between the powders is often insufficient and cannot meet the requirements of high strength.

Method used

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  • Magnetically soft alloy composite material and preparation method thereof
  • Magnetically soft alloy composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the soft magnetic alloy composite material is granular, including: spherical powder made of Fe-based alloy, hereinafter referred to as soft magnetic particles 4, the surface of the soft magnetic particles 4 has a hydrophobic structure layer 2, the hydrophobic The outer surface of the structural layer 2 is combined with a metal layer 1, and the outer surface of the PVD metal layer 1 has a dense oxide film; it also includes a resin coating layer 2 made of polyvinyl alcohol resin and / or water-based acrylic resin.

[0032] Wherein, the PVD metal layer 1 is at least one of a Cr metal layer, an Al metal layer, or a Ti metal layer, that is, the PVD metal layer 1 can be only one layer, or two layers or three layers, and the The metals in the above two or three layers may be the same or partially the same, or all of them may be different. The thickness of the PVD metal layer 1 can be selected within not more than 2um, preferably 3-20nm. The particle ...

Embodiment 2

[0043] According to the preparation method described above, a spherical powder of aerosolized FeSi is selected, and the particle size of the powder is D50=25um.

[0044] Wash the selected powder in absolute ethanol to remove surface impurities, and use silane to react with groups such as hydroxyl groups on the surface of the alloy material to form a hydrophobic structure layer.

[0045] Put the treated powder into the loading tank of the PVD coating machine, preheat to 200°C, and stir it with a dispersing impeller to form a flowable powder. Then, put the Cr target in the coating machine, and sputter the surface of the particles in the powder to form a Cr metal layer. The thickness of the Cr metal layer is 10 nm. The thickness of the Cr metal layer has a great influence on the relevant performance of the product. If it is too thick, it will lead to the increase of non-magnetic substances and reduce the saturation magnetization Ms of the material, which will lead to the deterio...

Embodiment 3

[0051] According to the preparation method described above, a spherical powder is selected for gas-atomization of FeNi, and the particle size of the powder is D50=25um.

[0052] Wash the selected powder in absolute ethanol to remove surface impurities, and use silane to react with groups such as hydroxyl groups on the surface of the alloy material to form a hydrophobic structure layer.

[0053] Put the processed powder into the loading tank of the PVD coating machine, preheat to 100°C, and stir it with a dispersing impeller to form a flowable powder. Put Al and Ti mixed target in the coating machine, and sputter to form a mixed metal layer of Al and Ti on the surface of the powder, wherein the thickness of the metal layer is 20nm.

[0054] Add 0.4wt% polyvinyl alcohol to the processed powder, mix and pulverize it into a composite material with 70-200um particles.

[0055] The obtained mixed powder was pressed in a mold at a temperature of 100° C. using 1000 MPa to prepare a t...

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Abstract

The invention discloses a magnetically soft alloy composite material and a preparation method thereof. The magnetically soft alloy composite material comprises spherical powder made of Fe-based alloy and / or carbonyl iron, and the surface of the spherical powder is provided with a hydrophobic structure layer and is combined with a metal layer. The magnetically soft alloy composite material further comprises a resin coating layer made of polyvinyl alcohol resin and / or water-based acrylic resin. The preparation method of the magnetically soft alloy composite material comprises the steps of taking a spherical powdery Fe-based alloy material or a carbonyl iron material or a mixed material of the spherical powdery Fe-based alloy material and the carbonyl iron material; cleaning and forming a hydrophobic structure layer on the surface; further processing into a powder material in a flowing state; forming at least one of a Cr metal layer or an Al metal layer or a Ti metal layer on the surfaces of the particles; and mixing with polyvinyl alcohol resin and / or water-based acrylic resin, and crushing into mixture particles. Experiments show that the material loss of the magnetically soft alloy composite material is superior to that of related materials in the prior art, and the strength of the magnetically soft alloy composite material is obviously higher than that of the materials in the prior art.

Description

technical field [0001] The invention relates to the technical field of soft magnetic alloy composite materials, in particular to a soft magnetic alloy composite material and a preparation method thereof. Background technique [0002] With the development of big data, cloud computing, and the Internet of Things, the demand for high efficiency and high power density in data centers is increasing, the development of wide bandgap semiconductor power devices (GaN, SiC) and the improvement of high power density ceramic capacitor technology, This will drive power conversion to higher efficiencies and densities, requiring higher resistance to DC superposition and lower losses in inductors. The loss of ferrite power devices is relatively low, but the anti-DC superposition ability is low, which cannot meet the current requirements for power inductors. Soft magnetic alloy materials have the characteristics of high Bs, high magnetic permeability, excellent current superposition and hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33H01F41/02
CPCH01F1/33H01F41/026
Inventor 谈敏郭海聂敏侯勤田李有云
Owner SHENZHEN SUNLORD ELECTRONICS
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