Composite magnetic material and process for producing the composite magnetic material

A technology of composite magnetic materials and bonding materials, applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve problems such as difficult heat treatment, and achieve the effects of low breaking strength, high filling and excellent lubricity

Active Publication Date: 2011-08-31
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, for example, in the technology proposed in Patent Document 1, the heat resistance temperature is about 500°C to 600°C, and it is difficult to realize heat treatment at a higher temperature.

Method used

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  • Composite magnetic material and process for producing the composite magnetic material
  • Composite magnetic material and process for producing the composite magnetic material
  • Composite magnetic material and process for producing the composite magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An Fe—Si—Al-based metal magnetic powder having an average particle diameter of 24 μm, containing 8.9% by weight of Si, and 5.9% by weight of Al was prepared. To 100 parts by weight of the prepared metal magnetic powder, 0.8 parts by weight of various inorganic insulators described in Table 1 having an average mixed major axis length of 4 μm and various aspect ratios were added to prepare a mixed powder. After adding 1.0 parts by weight of the silicone resin to 100 parts by weight of the obtained mixed powder, a small amount of toluene was added to carry out kneading and dispersion to prepare a mixture. at 10ton / cm 2 The obtained mixture was press-molded and heat-treated at 850° C. for 1.0 h in an argon atmosphere. In addition, the shape of the prepared sample was a toroidal core with an outer shape of 14 mm, an inner diameter of 10 mm, and a height of about 2 mm.

[0044] The obtained samples were evaluated for DC superposition characteristics, iron loss, and aspect r...

Embodiment 2

[0049] An Fe—Ni-based metal magnetic powder having an average particle diameter of 15 μm and containing 49.5% by weight of Ni was prepared. To 100 parts by weight of the prepared metal magnetic powder, 1.0 part by weight of various inorganic insulating materials described in Table 2 having an average mixed long axis length of 3 μm and various aspect ratios was added to prepare a mixed powder. After adding 0.7 parts by weight of an aluminum-based coupling agent and 0.6 parts by weight of a butyral resin to 100 parts by weight of the obtained mixed powder, a small amount of ethanol was added for uniform dispersion to prepare a mixture. at 9ton / cm 2 The obtained mixture was press-molded, and heat-treated at 790° C. for 0.5 h in a nitrogen atmosphere. In addition, the shape of the prepared sample was a ring core with an outer shape of 14 mm, an inner diameter of 10 mm, and a height of about 2 mm.

[0050] The obtained samples were evaluated for DC superposition characteristics, ...

Embodiment 3

[0055] An Fe—Si-based metal magnetic powder having an average particle diameter of 20 μm and containing 4.9% by weight of Si was prepared. To 100 parts by weight of the prepared metal magnetic powder, 2 parts by weight of various mica (mica) described in Table 3 with an aspect ratio of 5 and various average lengths of major axes were added as an inorganic insulator to prepare a mixed powder. . After adding 1.0 parts by weight of the silicone resin to 100 parts by weight of the obtained mixed powder, a small amount of toluene was added to carry out kneading and dispersion to prepare a mixture. at 15ton / cm 2 The obtained mixture was press-molded, and heat-treated at 900° C. for 1.0 h in an argon atmosphere. In addition, the shape of the prepared sample was a ring core with an outer shape of 14 mm, an inner diameter of 10 mm, and a height of about 2 mm.

[0056] The obtained samples were evaluated for DC superposition characteristics and iron loss. Regarding the DC superposit...

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Abstract

Disclosed is a composite magnetic material having excellent soft magnetic characteristics that can realize a reduction in size of electromagnetic components such as inductors, choke coils, and transformers and is usable in a high frequency range. The composite magnetic material is characterized in that the composite magnetic material comprises substantially spherical metallic magnetic powders, a flat inorganic insulating material interposed among the metallic magnetic powders, and a binder, the metallic magnetic powders have an aspect ratio of not more than 3, and the inorganic insulating material has an aspect ratio of not less than 2 and is cleavable. Also disclosed is a process for producing the composite magnetic material, which comprises performing a press molding step while crushing the inorganic insulating material.

Description

technical field [0001] The present invention relates to a composite magnetic body used in inductors, choke coils, transformers and the like of electronic equipment. Background technique [0002] With recent miniaturization of electric and electronic equipment, magnetic materials are also required to be compact and highly efficient. Conventional magnetic materials include, for example, ferrite cores in which ferrite powder is used for choke coils used in high-frequency circuits, and dust cores that are compacts of metal magnetic powder. [0003] Among them, ferrite cores have disadvantages such as low saturation magnetic flux density and poor DC superposition characteristics. Therefore, in the conventional ferrite core, in order to ensure the DC superposition characteristic, a gap of several hundred μm is provided in the direction perpendicular to the magnetic circuit to prevent a decrease in the inductance L value during DC superposition. However, such a wide gap becomes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/26H01F1/147H01F1/20H01F1/33
CPCH01F1/1475H01F1/14791H01F1/14766H01F1/14708H01F1/14H01F1/24C22C2202/02H01F41/0246
Inventor 高桥岳史若林悠也
Owner PANASONIC CORP
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