Magnetic metal powder which is of composite structure and used for preparing metal powder core

A magnetic metal powder and metal powder core technology, applied in the field of magnetic metal powder, can solve the problems of magnetic powder core performance not fully exerted, hard to deform materials, high hardness, etc.

Inactive Publication Date: 2014-01-29
郭峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a magnetic metal powder with a composite structure for preparing metal powder cores, so as to

Method used

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  • Magnetic metal powder which is of composite structure and used for preparing metal powder core
  • Magnetic metal powder which is of composite structure and used for preparing metal powder core
  • Magnetic metal powder which is of composite structure and used for preparing metal powder core

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1

[0016] This embodiment uses Fe 78 (SiB) 22 The water atomized amorphous powder is approximately spherical in shape, with an average particle size D50 of 26um. After that, a metal aluminum film with a thickness of 3um is formed on the surface by an electroplating process, and then heated to 100°C for 10 minutes in a 1mol / L phosphoric acid solution A layer of aluminum phosphate salt compound is formed with a thickness of 5um; finally, a magnetic powder core is prepared through a coating process, pressure forming and heat treatment. For comparison, use Fe 78 (SiB) 22 The magnetic powder core is prepared by water atomization of amorphous powder and the same process. Its performance is as follows:

[0017]

[0018] Note: Loss test conditions:

[0019] It can be seen from the above table that the use of the composite structure amorphous powder of the present invention can effectively reduce the loss of the magnetic powder core and increase the magnetic permeability. ...

Example Embodiment

[0020] Example 2

[0021] This embodiment uses Fe 78 (SiB) 22 Water-atomized amorphous powder, approximately spherical in shape, with an average particle size D50 of 26um. After that, a metal iron film with a thickness of 2um is formed on the surface by an electroplating process, and then heated to 60°C for 10 minutes in a 1mol / L phosphoric acid solution A layer of iron phosphate compound is formed with a thickness of 1um, and then a layer of low-melting glass powder with a softening point of 380℃ is coated on the surface, and the average particle size D50 of the powder is 10um; finally, the coating process, pressure forming and heat treatment Prepare a magnetic powder core. For comparison, use Fe 78 (SiB) 22 The magnetic powder core is prepared by water atomization of amorphous powder and the same process. Its performance is as follows:

[0022]

[0023] Note: Loss test conditions:

[0024] It can be seen from the above table that the use of the amorphous powder of the composit...

Example Embodiment

[0027] Example 3

[0028] This embodiment uses Fe 78 Si 9.6 Al 5.4 The crushed powder is approximately spherical in shape, with an average particle size D50 of 45um; after that, a metal aluminum film with a thickness of 2um is formed on the surface by electroplating process, and then heated to 100℃ in a 1mol / L phosphoric acid solution for 10 minutes to generate a layer of phosphoric acid Aluminum salt complex with a thickness of 3um, and then added to 1mol / L NaOH solution and reacted at room temperature for 30 minutes, forming Al(OH) on the surface 3 Precipitation; then heated to 200°C and dried for 30 minutes to form an aluminum oxide film; finally, a magnetic powder core is prepared through a coating process, pressure forming and heat treatment. For comparison, use Fe 78 Si 9.6 Al 5.4 The magnetic powder core is prepared by water atomization of amorphous powder and the same process.

[0029] Its performance is as follows:

[0030]

[0031]

[0032] Note: Loss test conditions:

...

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Abstract

The invention provides magnetic metal powder which is of a composite structure and used for preparing a metal powder core. The magnetic metal powder prepared with the method is of a three-layer structure, wherein the innermost layer is made of magnetic metal or alloy and is the contributor of magnetic performance of the metal powder core; the second layer is made of metal or alloy with relatively low hardness and plays a role in buffering in a powder core forming process; the outermost layer is made of ionic compounds with the insulation characteristic, such as metallic oxide or nitride, and the mixture of the ionic compounds. Furthermore, the metal powder core prepared with the powder is small in residual stress and high in density, and therefore the metal powder core is low in loss, high in magnetic conductivity and good in direct current bias property. The magnetic metal powder which is of the composite structure is especially suitable for being used for preparing the metal powder core of magnetic metal powder which is high in hardness and hard to deform, such as Sendust alloy powder, amorphous alloy powder and nanocrystalline alloy powder. The forming pressure and residue stress in a forming process can be reduced remarkably, the density of the powder core is increased, and the performance of the metal powder core is finally improved.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, and relates to a magnetic metal powder with a composite structure for preparing a metal powder core. Background technique [0002] Magnetic powder core is a kind of soft magnetic material with distributed air gap characteristics. Its material is composed of metal powder, powder surface insulating agent and binder; the particles are kept insulated by the insulating agent on the surface, and the powder depends on the binder. While maintaining a certain strength with each other, the air gap between the particles becomes the main energy storage location. [0003] Generally, magnetic powder cores include iron powder cores, iron silicon powder cores, sendust powder cores, and permalloy powder cores. In recent years, with the development of the power electronics industry, the requirements for device miniaturization, high frequency and high power density have made it difficult for existing m...

Claims

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Application Information

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IPC IPC(8): H01F1/047H01F1/06
Inventor 郭峰
Owner 郭峰
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