Method for manufacturing soft magnet silicon-aluminium magnetic powder core

A manufacturing method and technology of magnetic powder core, applied in the direction of inductor/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc. Low stress, increased cost, and low release force

Inactive Publication Date: 2008-02-06
王锋 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, with the rapid development of switching power supplies and UPS, it requires magnetic components with high magnetic permeability, high saturation magnetic flux density, low loss when operating at high frequency, and a small decrease in magnetic permeability after adding a DC bias magnetic field. A large number of iron powders are used. The core generally has low magnetic permeability (for μe=75), and the core loss is relatively large
The magnetic permeability of the sendust magnetic powder core can reach μe=125, the saturation magnetic flux density is about 1.05T (Tesla), and the magnetostriction coefficient is close to zero. Now, in order to obtain a good soft magnet silicon-aluminum magnetic powder core, many The process is complex, but the disadvantages of sendust are high brittleness, low toughness, narrow composition range, high sensitivity to heat treatment temperature, easy peeling off of molded molding, and a loose state. If the wire is directly wound on the iron core, it will Crack and break the iron core, resulting in magnetic deterioration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The manufacturing method of the soft magnet silicon-aluminum magnetic powder core of the present invention comprises:

[0029] 1. Magnetic particle size distribution:

[0030] -100 mesh to +150 mesh 15g, -150 mesh to +250 mesh 60Kg, -250 to +320 mesh 20Kg, -320 5Kg and mix well.

[0031] 2. Magnetic powder surface treatment:

[0032] Soak 100Kg magnetic powder mixed uniformly with 0.1-0.2% chromic anhydride aqueous solution for 10 minutes,

[0033] Bake in an oven at 100°C for 1.5 hours to dry.

[0034] 3. Magnetic powder, insulating agent, mold sticking agent, mold release agent, mix well.

[0035] Add 1.5Kg of -300 mesh mica powder to 100Kg of magnetic powder, and then add 1Kg of binder. Release agent 0.8Kg, placed in a built-in mixer and stirred evenly.

[0036] 4. Compression molding:

[0037] Put the magnetic powder material containing insulating agent, adhesive and release agent that has been stirred evenly into the mold, and use 25t / cm 2 pressure molding. ...

Embodiment 2

[0053] The manufacturing method of the soft magnet silicon-aluminum magnetic powder core of the present invention comprises:

[0054] 1. Magnetic particle size distribution:

[0055] -100 mesh to +150 mesh 10Kg, -150 mesh to +250 mesh 40Kg, -250 to +320 mesh 25Kg, -320 25Kg and mix well.

[0056] 2. Magnetic powder surface treatment:

[0057] Soak 100Kg magnetic powder mixed evenly with 0.5% chromic anhydride aqueous solution for 6 minutes, bake in an oven at 120°C for 1 to 3 hours to dry.

[0058] 3. Magnetic powder, insulating agent, mold sticking agent, mold release agent, mix well.

[0059] Add 1Kg of -300 mesh mica powder to 100Kg of magnetic powder. Then add 1Kg of binder. Release agent 1.2Kg, placed in a built-in mixer and stirred evenly.

[0060] 4. Compression molding:

[0061] Put the evenly stirred and mixed magnetic powder material containing insulating agent, adhesive and release agent into the mold, and use 22t / cm 2 pressure molding.

[0062] 5. Curing tr...

Embodiment 3

[0077] The manufacturing method of the soft magnet silicon-aluminum magnetic powder core of the present invention comprises:

[0078] 1. Magnetic particle size distribution:

[0079] -100 mesh to +150 mesh 12Kg, -150 mesh to +250 mesh 50Kg, -250 to +320 mesh 23Kg, -320 15Kg and mix well.

[0080] 2. Magnetic powder surface treatment:

[0081] Soak 100Kg magnetic powder evenly mixed with 0.9% chromic anhydride aqueous solution for 3 minutes, bake in an oven at 150°C for 1 hour to dry.

[0082] 3. Magnetic powder, insulating agent, mold sticking agent, mold release agent, mix well.

[0083] Add 1.2Kg of -300 mesh mica powder to 100Kg of magnetic powder. Then add 1Kg of binder. Release agent 0.8Kg, placed in a built-in mixer and stirred evenly.

[0084] 4. Compression molding:

[0085] Put the magnetic powder material containing insulating agent, adhesive and mold release agent that has been stirred and mixed evenly into the mold, and use 18t / cm 2 pressure molding.

[008...

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PUM

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Abstract

The production process of soft magnetic Fe-Si-Al powder core includes the steps of compounding magnetic powder in different sizes, surface treatment, mixing magnetic powder, insulating agent, adhesive and demolding agent, molding, curing, magnetic heat treatment, soaking and surface coating. The present invention has the advantages of: breaking strength after curing in radial direction of 7-12 kg, less surface stripping, small demolding force, final breaking strength in radial direction of 17-24 kg, no influence of the insulating lacquer on electromagnetic performance and capability of realizing automatic production.

Description

technical field [0001] The invention relates to the technical field of magnetic objects, in particular to a method for manufacturing a soft magnetic silicon-aluminum magnetic powder core. Background technique [0002] At present, with the rapid development of switching power supplies and UPS, it requires magnetic components with high magnetic permeability, high saturation magnetic flux density, low loss when operating at high frequency, and a small decrease in magnetic permeability after adding a DC bias magnetic field. A large number of iron powders are used. The core generally has low magnetic permeability (for μe=75), and the core loss is relatively large. The magnetic permeability of the sendust magnetic powder core can reach μe=125, the saturation magnetic flux density is about 1.05T (Tesla), and the magnetostriction coefficient is close to zero. Now, in order to obtain a good soft magnet silicon-aluminum magnetic powder core, many The process is complex, but the disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/22
Inventor 王锋王茜
Owner 王锋
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