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Method of producing composite magnetic material and composite magnetic material

A composite magnetic material and a manufacturing method technology, applied in the field of inductors, can solve the problems of iron powder processing deformation, magnetic property deterioration, magnetic permeability and loss of magnetic properties of iron cores, etc., and achieve high reliability and excellent withstand voltage. , the effect of improving the magnetic properties

Inactive Publication Date: 2011-04-06
TOHO ZINC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case of powdered iron cores, extrusion molding is performed under high pressure, so deformation of the iron powder occurs and magnetic properties deteriorate, so heat treatment at high temperature is performed to remove the deformation
However, if heat treatment is carried out at high temperature, due to the poor wettability of the soft magnetic metal powder and glass, the glass fused on the surface of the soft magnetic metal powder is granular and isolated in the structure, and the surface of the soft magnetic metal powder is not covered by the glass. Therefore, there is a problem that the required insulation and withstand voltage cannot be ensured.
On the other hand, if the heat treatment temperature is lowered so that the glass does not become granular on the surface of the soft magnetic metal powder, the processing deformation caused by extrusion molding cannot be removed, and the magnetic properties such as magnetic permeability and core loss will decrease.

Method used

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  • Method of producing composite magnetic material and composite magnetic material
  • Method of producing composite magnetic material and composite magnetic material
  • Method of producing composite magnetic material and composite magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A so-called aluminum-silicon-iron alloy having a composition of Fe-9.5% by mass Si-5.5% by mass Al was produced by a vacuum dissolution method, and an alloy powder having an average particle size of about 80 μm was obtained by a mechanical pulverization method. Add 0.5% by mass of an insulating layered compound and 1.0% by mass of a non-magnetic bonding material to the alloy powder, perform wet mixing with methyl ethyl ketone, and granulate while heating and drying to obtain a mixed powder . In addition, the insulating layered compound is talc, and the binder is silicone resin. The obtained mixed powder was extruded at a molding pressure of 1.8GPa to produce a ring-shaped iron core with an outer diameter of 13.4mm, an inner diameter of 7.7mm, and a thickness of 5.5mm, and then heat-treated in air at 750°C for 1 hour to produce a sample No. 8, which is used as Example 1. For this sample, the magnetic permeability was measured with an LCR tester at a frequency of 100kHz...

Embodiment 2

[0059] Using Fe-9.5 mass % Si-5.5 mass % Al alloy powder of the same composition as in Example 1, an insulating layered compound and water glass as a binder were added to the alloy powder, wet mixed with water, and produced while heating and drying. Granules were prepared as mixed powder, and an annular iron core was produced in the same manner as in Example 1. Three types of bentonite, talc, and mica were used as the insulating layered compound. For each of these three kinds of insulating layered compounds, two samples were produced, respectively, sample Nos. 11 to 16, and these samples were used as Examples 2-1, 2-2, 2-3, 2-4, and 2- 5. 2-6. In addition, bentonite contains montmorillonite. In addition, as for mica, what was pulverized into a fine powder with a mortar was used. The obtained ring was subjected to heat treatment at temperatures of 400° C. and 750° C. in air for 1 hour, respectively, and the same test as in Example 1 was carried out.

reference example 2、3

[0061] Sample Nos. 9 and 10 in which an insulating layered compound was not added were produced as Reference Examples 2 and 3, and were evaluated by the same test as in Example 1. The above results are shown in Table 2.

[0062] Table 2

[0063]

[0064] It can be seen from Table 2 that only in the case of water glass, the resistance is low and the withstand voltage cannot be obtained; by adding an insulating layered compound, the required insulation and withstand voltage can be ensured, and the magnetic permeability and core loss are also low. excellent.

[0065]That is, the resistance (insulation) and withstand voltage of each of Examples 2-1 to 2-6 exceeded the above-mentioned judgment level; and the magnetic permeability and core loss were not inferior or superior to Reference Examples 2 and 3.

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Abstract

Disclosed is a method for producing a composite magnetic material which has high magnetic permeability and low core loss, while securing high insulation and high withstand voltage. A composite magnetic material produced by the method is also disclosed. Specifically, a nonmagnetic binding material containing an insulating lamellar compound is mixed with a soft magnetic metal powder, then the resulting mixture is formed into a desired shape, and then the shaped body is subjected to a heat treatment under predetermined conditions. Consequently, a thin insulating layer composed of the insulating lamellar compound is formed on the surface of the soft magnetic metal powder.

Description

technical field [0001] The present invention relates to a method for manufacturing an inductor wound on a metal-based soft magnetic alloy composite material, which is suitable for a power supply circuit of an electronic component, and particularly relates to an inductor used for manufacturing an iron core with excellent magnetic properties, such as pressed powder. A method for a composite magnetic material such as an iron core and a composite magnetic material produced therefrom. Background technique [0002] In recent years, along with the miniaturization and power saving of electric and electronic equipment, electronic components such as inductors are increasingly required to be smaller and more efficient. Inductors used in electrical and electronic circuits mostly use ferrite cores, but recently, ferrite cores have been used, which have a higher saturation magnetic flux density and excellent DC superposition characteristics than ferrite, and soft magnetic metal powders ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/33B22F1/00B22F1/02B22F3/02H01F1/24B22F1/08B22F1/16
CPCC22C38/00B22F2998/10B22F1/02H01F41/0246H01F17/043H01F17/062C22C38/02C22C38/06H01F1/24H01F1/33C22C38/08B22F1/16B22F1/08B22F1/105B22F2003/248B22F3/02
Inventor 大槻悦夫中野心哉黑崎紘史
Owner TOHO ZINC
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