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Soft magnetic material, dust core, method for producing soft magnetic material, and method for producing dust core

A technology of soft magnetic materials and dust cores, which is applied in the field of soft magnetic materials, can solve the problems of increased eddy current loss and lower resistivity of dust cores, and achieve the effects of improved heat resistance, increased bonding density, and high affinity

Inactive Publication Date: 2010-07-28
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the dust core is heat-treated at a high temperature of 400°C or higher, the insulating coating film is unfavorably destroyed due to heating, thereby reducing the resistivity ρ of the dust core and increasing the eddy current loss

Method used

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  • Soft magnetic material, dust core, method for producing soft magnetic material, and method for producing dust core
  • Soft magnetic material, dust core, method for producing soft magnetic material, and method for producing dust core
  • Soft magnetic material, dust core, method for producing soft magnetic material, and method for producing dust core

Examples

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Embodiment 1

[0148] In Example 1, production was performed according to the production method of the first embodiment. Specifically, ABC100.30 (from AB company) as the iron-based particles 10. The iron-based particles 10 were immersed in titanium lactate (trade name "Orgatics TC 315", manufactured by Matsumoto Pharmaceutical Industry Co., Ltd.), so that on the surface of the iron-based particles 10, Ti(OH)-containing 2 (OCHCH 3 COO) 2 The insulating coating film 20. Then, heat treatment was performed at 500° C. to evaporate the carbon element of the organic group, thereby obtaining the soft magnetic material of Example 1.

Embodiment 2

[0150] In Example 2, substantially the same steps as in Example 1 were performed except that another insulating coating film surrounding the surface of the insulating coating film was formed.

[0151] Specifically, 0.2% by weight of TSR116 (manufactured by GE Toshiba Silicones) and 0.1% by weight of XC96-B0446 (manufactured by GE Toshiba Silicones), each of which were silicone resins, were dissolved and dispersed in a xylene solvent. To the resulting solution was added the composite magnetic particle 30 described above. The resulting mixture was then subjected to stirring and evaporative drying in a room. Thus, an insulating coating film 20b containing a silicone resin having an average film thickness of 150 nm was formed to surround the surface of the insulating coating film 20 having an average film thickness of 50 nm and having a main component of Ti—O—Ti.

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Abstract

Disclosed is a soft magnetic material containing a plurality of composite magnetic particles (30) each having an iron-based particle (10) containing iron and an insulating coating film (20) covering the surface of the iron-based particle (10). The insulating coating film contains an organic group derived from an organic acid containing at least one substance selected from the group consisting of titanium, aluminum, silicon, calcium, magnesium, vanadium, chromium, strontium and zirconium. At least one substance in the insulating coating film (20) is bonded with iron in the iron-based particle (10) through the organic group of the insulating coating film (20) which is derived from an organic acid. Also disclosed is a method for producing a soft magnetic material, which comprises a step for preparing an iron-based particle (10) containing iron and a step for forming an insulating coating film (20) covering the surface of the iron-based particle (10). In the step for forming an insulating coating film, an organic acid containing the above-mentioned substance is brought into contact with the surface of the iron-based particle (10).

Description

technical field [0001] The present invention relates to a soft magnetic material, a dust core, a method of manufacturing a soft magnetic material, and a method of manufacturing a dust core. Background technique [0002] In an electric appliance having, for example, a solenoid valve, a motor, and a power supply circuit, a dust core formed by pressing a soft magnetic material is used. Soft magnetic materials are formed from a plurality of composite magnetic particles. Each composite magnetic particle contains iron-based particles and a glassy insulating coating covering the surface of the iron-based particles. Soft magnetic materials are required to have magnetic properties that provide high magnetic flux density when a low magnetic field is applied thereto, and that are sensitive to changes in an external magnetic field. [0003] When a dust core is used in an alternating magnetic field, energy loss occurs, ie, core loss. Core loss is expressed as the sum of hysteresis los...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/24H01F1/26H01F41/02B22F1/102
CPCH01F1/26B22F1/0062C22C2202/02C01P2006/42C09C1/62C22C33/02H01F41/0246B22F1/102
Inventor 前田彻草别和嗣
Owner SUMITOMO ELECTRIC IND LTD
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