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Soft magnetic material, core, and inductor

A soft magnetic material and soft magnetic technology, applied in the direction of inorganic material magnetism, transformer/inductor components, circuits, etc., can solve the problems of DC superposition characteristic deterioration, inductance reduction, volume reduction, etc., and achieve excellent DC superposition characteristics, The effect of high magnetic permeability

Active Publication Date: 2018-08-03
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, with the high-density mounting and high-speed processing of electronic equipment, miniaturization and high output are also required in inductors. Therefore, it is easy to cause a decrease in inductance and deterioration of DC superposition characteristics (inductance under DC current load)

Method used

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  • Soft magnetic material, core, and inductor
  • Soft magnetic material, core, and inductor
  • Soft magnetic material, core, and inductor

Examples

Experimental program
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Effect test

Embodiment 1

[0057] As the powder of the particle group α, a spherical Fe-2.4% by mass B-6.4% by mass Si-2.1% by mass Cr amorphous alloy prepared by the water atomization method is prepared, and the surface is insulated and coated with phosphate glass A powder with a peak particle diameter of 10.1 μm, and as a powder of the particle group β, an iron powder produced by a spray thermal decomposition method and a powder with a peak particle diameter of 0.5 μm was prepared. The powder of the particle group β and the powder of the particle group α were blended in a weight ratio of 1:3 to obtain the soft magnetic metal powder of Example 1 having the peak particle diameter in Table 1. Next, 2.5 wt% of a liquid epoxy resin was added, an organic solvent was added, and the viscosity was adjusted while sufficiently kneading to obtain a paste-like soft magnetic material of Example 1. Then, the paste-like soft magnetic material is filled in a mold with a ring-shaped groove, dried to a semi-cured shape, ...

Embodiment 2

[0060] Except that a powder with a peak particle diameter of 18.5 μm is used as the powder of the particle group α, and a carbonyl iron powder produced by the carbonyl method and a powder with a peak particle diameter of 0.9 μm is used as the powder of the particle group β, the same method as in Example 1 Conditions obtained the soft magnetic powder, soft magnetic material and magnetic core of Example 2.

Embodiment 3

[0062] Except that a powder with a peak particle diameter of 24.0 μm was used as the powder of the particle group α, and a powder with a peak particle diameter of 1.3 μm produced by carbonyl iron powder was used as the powder of the particle group β, the same method as in Example 1 was used. Conditions obtain the soft magnetic metal powder, soft magnetic material and magnetic core of Example 3.

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Abstract

The invention provides a soft magnetic material, a core, and an inductor having high permittivity and excellent DC superimposition characteristic. The soft magnetic material is characterized by comprising a soft magnetic metal powder and a resin, wherein the soft magnetic metal powder is constituted from a particle group alpha and group beta, when IA is a peak intensity of the particle group alpha, IB is a peak intensity of the particle group beta, and IC is a minimum intensity present between the particle group alpha and group beta, then an intensity ratio IC / IA satisfies 0.10 or less and anintensity ratio IA / IB satisfies 1.2 or more and 3.0 or less, and a peak particle size PA of the particle group alpha is larger than a peak particle size PB of the particle group beta.

Description

Technical field [0001] The present invention relates to soft magnetic materials, magnetic cores and inductors. Background technique [0002] In recent years, with the high-density mounting and high-speed processing of electronic devices, inductors are also required to be miniaturized and high-output. However, due to this miniaturization, the magnetic core of the inductor (core made of magnetic material) The volume of the SR is reduced, therefore, it is easy to cause the decrease of inductance and the deterioration of DC superimposition characteristics (inductance when DC current is loaded). [0003] Therefore, there is a need for a magnetic core that does not cause a decrease in inductance and deterioration of DC superimposition characteristics even in the case of miniaturization, that is, a soft magnetic material with high permeability and excellent DC superimposition characteristics. [0004] As inventions related to conventional soft magnetic materials, for example, soft magnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/255H01F1/24
CPCH01F1/24H01F27/255
Inventor 新海芳浩神谷贵志小枝真仁阿部晓太朗
Owner TDK CORPARATION
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