Magnetic metal powder with high forming density, low molding pressure and surface insulation

A technology of magnetic metal powder and molding pressure, applied in the field of magnetic metal powder, can solve the problems of high hardness, incomplete performance of magnetic powder core, low molding pressure, etc.

Inactive Publication Date: 2019-05-31
KUNSHAN CITONG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a magnetic metal powder with high molding density, low molding pressure and surface insul...

Method used

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  • Magnetic metal powder with high forming density, low molding pressure and surface insulation
  • Magnetic metal powder with high forming density, low molding pressure and surface insulation
  • Magnetic metal powder with high forming density, low molding pressure and surface insulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This example uses Fe 78 (SiB) 22 Atomized amorphous powder, approximately spherical in shape, with an average particle size D50 of 26um, and then using an anodic plating process to form a metal aluminum film with a thickness of 0.2um on its surface, and then heating it to 100°C in a phosphoric acid solution with a pH of 2.0 to react for 10 A layer of aluminum phosphate compound is formed in minutes, with a thickness of 0.05um; finally, the magnetic powder core is prepared by pressure molding and heat treatment. For comparison, Fe 78 (SiB) 22 Magnetic powder cores were prepared by water atomizing amorphous powder and the same process. Its performance is as follows:

[0019]

[0020] 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, because the middle aluminum metal layer effectively relieves the str...

Embodiment 2

[0022] This example uses Fe 78 (SiB) 22 Water-atomized amorphous powder, approximately spherical in shape, with an average particle size D50 of 26um, and then a metal iron film with a thickness of 0.1um is formed on the surface by electroplating, and then heated to 100°C in a phosphoric acid solution with pH=2.0 to react for 10 A layer of iron phosphate compound is formed in minutes, with a thickness of 0.05um; finally, the magnetic powder core is prepared by pressure molding and heat treatment. For comparison, Fe 78 (SiB) 22 Magnetic powder cores were prepared by water atomizing amorphous powder and the same process. Its performance is as follows:

[0023]

[0024] 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, because the iron metal layer in the middle effectively relieves the stress concentration an...

Embodiment 3

[0026] This example 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 0.2um is formed on the surface by anodic plating process, and then heated to 100°C in a phosphoric acid solution with pH=2.0 for 10 minutes to form a A layer of aluminum phosphate compound with a thickness of 0.05um; finally, the magnetic powder core is prepared by pressure molding and heat treatment. For comparison, Fe 78 Si 9.6 al 5.4 Magnetic powder cores were prepared by water atomizing amorphous powder and the same process. Its performance is as follows:

[0027]

[0028] As can be seen from the above table, the use of the composite structure amorphous powder of the present invention can effectively reduce the loss of the magnetic powder core, because:

[0029] (1) The iron metal layer in the middle effectively relieves stress concentration;

[0030] (2) The plastic ...

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Abstract

The invention provides a magnetic metal powder with high forming density, low molding pressure and surface insulation. The powder manufactured through the method has three layers of structures from inside to outside. An innermost material is magnetic metal or an alloy powder with Vickers hardness which is greater than or equal to 800 and is a source of a magnetic property of a metal powder core; asecond layer material is a relatively soft metal or an alloy film with the Vickers hardness which is less than or equal to 400 and achieves the effect of reducing a stress during a powder molding process; and an outermost layer material is an insulating layer formed by an inorganic non-metal material. In addition, the metal powder core manufactured through using the powder has a small residual stress, high powder core density and small molding pressure so that the metal powder core has low losses and high magnetic permeability. The composite structure magnetic powder is suitable for manufacturing the metal powder of the magnetic metal powder which has high hardness and is difficult to deform, such as a Sendust alloy powder, an amorphous soft magnetic metal powder, a nanocrystalline alloypowder and the like. The molding pressure and the residual stress can be significantly reduced during a molding process. Powder core density is increased and finally the performance of the metal powder core is improved.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, and relates to a magnetic metal powder with high molding density, low molding pressure and surface insulation. 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 ...

Claims

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Application Information

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IPC IPC(8): H01F1/24
Inventor 郭峰汪贤黄裕茂金叶萍许玉成周庆国
Owner KUNSHAN CITONG NEW MATERIAL TECH CO LTD
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