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Composite magnetic body and method for manufacturing same

A composite magnetic body and metal magnetic technology, which is applied in the manufacture of inductors/transformers/magnets, the magnetism of inorganic materials, magnetic cores/yokes, etc., can solve the problem that it is difficult to further obtain powder magnetic cores, and metal magnetic particles cannot obtain sufficient mechanical strength, etc. problems, achieve the effects of improving mechanical strength, suppressing eddy current loss, and suppressing contact frequency

Active Publication Date: 2015-07-01
PANASONIC INTPROP MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simply increasing the filling rate of metal magnetic particles cannot obtain sufficient mechanical strength, and it is difficult to further obtain a dust core with excellent magnetic properties.

Method used

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  • Composite magnetic body and method for manufacturing same
  • Composite magnetic body and method for manufacturing same
  • Composite magnetic body and method for manufacturing same

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Experimental program
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Effect test

Embodiment approach 1

[0021] figure 1 It is an enlarged schematic cross-sectional view of the composite magnetic body 10 in Embodiment 1 of the present invention. Composite magnetic body 10 includes metal magnetic powder composed of a plurality of metal magnetic particles 12 , and insulating resin 16 as an insulator impregnated at least part of gaps 14 between the plurality of metal magnetic particles 12 .

[0022] The metal magnetic powder used in the composite magnetic body 10 is not particularly limited, but from the viewpoint of suppressing magnetic saturation at a large current, a material with a high saturation magnetization and mainly composed of iron is suitable. As examples of the material of the metal magnetic powder, in addition to iron, Ni, Si, Al, etc. are added to improve the soft magnetic properties, Fe-Ni alloy, Fe-Si alloy, Fe-Al-Si alloy, various non- Crystal alloys, metallic glass alloys, etc.

[0023] The method for producing the metal magnetic powder is not particularly limit...

Embodiment 1

[0054] In Sample No. 1 to Sample No. 41 shown in (Table 1), Fe—Si alloy powder having an average particle diameter of 20 μm produced by a gas atomization method was used as the metal magnetic powder. 0.2 wt% of a titanium coupling agent was added to the metal magnetic powder as an insulating material. Furthermore, the 1st polymer and the 2nd polymer were added in the ratio shown in (Table 1). As the first polymer, a first phenol resin having three or more side chains consisting of 8 carbon atoms and not having side chains consisting of 12 or more carbon atoms or silicon atoms is used. As the second polymer, a second phenol resin that does not have a side chain (the side chain is 0) composed of 7 or more carbon atoms or silicon atoms is used. In addition, in the present embodiment, the term "phenol resin" means that the main chain in the framework of the resin is unique to the phenol resin, and the side chain is not particularly limited.

[0055] For any sample, a small amoun...

Embodiment 2

[0079] In Sample No. 42 to Sample No. 45 shown in (Table 2), Fe—Si—Cr—B—C amorphous alloy powder having an average particle diameter of 30 μm produced by a water atomization method was used as the metal magnetic powder. To this metal magnetic powder, 0.5 wt % of alumina powder having an average particle diameter of 1 μm was added as an insulating material. Furthermore, the first polymer and the second polymer were mixed together with a small amount of toluene at 0.8% by weight relative to the metal magnetic powder. As the first polymer, a first epoxy resin having three or more side chains of 10 carbon atoms and no side chains of 12 or more carbon atoms is used. As the second polymer, a second epoxy resin having a total of three or more side chains consisting of 10 carbon atoms and side chains consisting of 13 carbon atoms is used.

[0080] The obtained mixture was dried at 90° C. for 30 minutes, and the dried product was pulverized and classified into a particle diameter of 1...

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Abstract

A composite magnetic body includes a metal magnetic powder formed of a plurality of metal magnetic particles and an insulating material which is impregnated into at least some spaces among a plurality of metal magnetic microparticles. In a cumulative distribution curve for the width of spaces between the metal magnetic particles, the width of spaces forming 50% of the cumulative distribution is 3 µm or less, and the width of spaces forming 95% of the cumulative distribution is 4 µm or more.

Description

technical field [0001] The present invention relates to a composite magnetic body used for inductance components such as inductors, choke coils, and transformers, and a method for manufacturing the same. Background technique [0002] With recent reduction in size and increase in current of electronic equipment, demands for miniaturization and high current driving have also increased for inductance components used in these devices. [0003] The inductance component is mainly composed of a coil and a magnetic material inserted into the coil. Among the magnetic materials used in such inductance components, there are ferrite cores (ferrite cores) and dust cores, which are composite magnetic materials, roughly classified. Since the saturation magnetization of the ferrite core is small, the ferrite core is prone to magnetic saturation. Therefore, the magnetic permeability is remarkably reduced under a large current required by recent electronic devices. As a countermeasure agai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/26H01F1/20H01F41/02B22F1/05B22F1/08
CPCH01F41/0246C22C33/02H01F1/26C22C2202/02B22F2003/023B22F2998/10B22F3/26B22F1/05B22F1/08B22F1/12B22F1/103B22F3/02B22F3/1021B22F3/12B22F2003/248H01F1/08H01F3/08H01F41/005H01F41/0266
Inventor 西尾翔太高桥岳史
Owner PANASONIC INTPROP MANAGEMENT CO LTD
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