Soft magnetic composite powder and production method of the same, and production method of soft magnetic compact

一种复合粉末、制造方法的技术，应用在磁性物体、电感/变压器/磁铁制造、磁性材料等方向，能够解决磁特性降低、模具寿命缩短、制造成本增高等问题，达到降低摩擦、提高填充密度、防止接触的效果

Active Publication Date: 2006-09-06
NTN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when low-melting point glass is used as a binder, it becomes easy to ensure electrical insulation between soft magnetic material powders. On the other hand, since both soft magnetic materials and glass are hard materials, when compacting powder High press pressure required
For this reason, there is a problem that a large press device is required, and the life of the mold is shortened, which increases the manufacturing cost.
[0004] In addition, when molding a resin composition, in order to ensure electrical insulation between soft magnetic material powders, a large amount of resin must be added, and for this reason, there is a problem that the magnetic properties are lowered.

Method used

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  • Soft magnetic composite powder and production method of the same, and production method of soft magnetic compact
  • Soft magnetic composite powder and production method of the same, and production method of soft magnetic compact

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Experimental program
Comparison scheme
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Embodiment approach 1

[0024] In this embodiment, one method of producing a composite powder using an inorganic insulating material as the electrical insulating material covering the surface of the soft magnetic powder will be described.

[0025] The soft magnetic body used in this embodiment contains oxide-based materials such as ferrite, metal-based materials such as carbonyl iron, Fe-Si alloys, Ni-Fe alloys, and Fe-based or Co-based amorphous alloys. It is preferable to use a soft magnetic amorphous alloy which is superior in soft magnetic properties such as corrosion resistance, wear resistance, strength, and high magnetic permeability or low coercive force compared to crystalline materials. The soft magnetic amorphous alloy is not particularly limited, and known amorphous alloys such as iron-based or cobalt-based alloys can be used.

[0026] In addition, in the inorganic insulating material used in this embodiment, for example, Al can be used 2 o 3 , SiO 2 , Y 2 o 3 , MgO, and ZrO 2 etc.,...

Embodiment approach 2

[0041] This embodiment relates to another manufacturing method of the soft magnetic composite powder. In this embodiment, the soft magnetic powder described in Embodiment 1, the inorganic insulating material, and the resin material are heated to a temperature equal to or higher than the melting point of the resin material and mixed to produce a composite powder. Preferably, glass powder is used as the inorganic insulating material, and resin powder is used as the resin material. The surface of the soft magnetic powder is covered with the resin powder fused to the soft magnetic powder and the glass powder bonded by the resin powder, thereby obtaining a composite powder in which the resin powder is fused to the surface of the glass powder.

[0042] Here, the particle size of the glass powder and the resin powder is smaller than that of the soft magnetic powder, preferably half or less, for example, when the particle size of the soft magnetic powder is 300 μm or less, 150 μm or l...

Embodiment approach 3

[0045] This embodiment relates to a method of manufacturing a soft magnetic molded body. In this embodiment, a soft magnetic fired body is produced by using the composite powder of Embodiments 1 and 2 as a raw material powder by so-called metal injection molding (MIM). MIM is a method of degreasing and firing the above-mentioned injection molded body to produce a fired body. Conventionally, in MIM, the strength of the molded body after the degreasing process is very low, and it cannot be used as a soft magnetic material in this state. In addition, when the molded body is sintered, the insulating properties are lowered, making it difficult to obtain a material with high magnetic properties. However, by using the composite powder of the present invention as a raw material powder, it is possible to obtain the same magnetic properties as in the above-mentioned powder compacting-firing method. Here, in the composite powder for MIM, it is preferable that the thermal decomposition ...

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Abstract

A soft magnetic compact which is produced by using soft magnetic composite powder in which the surface of magnetic powder is covered with an electrical insulating material containing at least an inorganic insulating material, and a resin material is fusion-bonded to the surface of the inorganic insulating material so as to partially cover the surface of the soft magnetic powder. Accordingly, it is possible to ensure an electrical insulating property between pieces of soft magnetic material powder to secure a good magnetic characteristics and to easily mold a compact.

Description

technical field [0001] The present invention relates to a soft magnetic composite powder, a method for producing the same, and a method for producing a soft magnetic compact using the soft magnetic composite powder. Background technique [0002] Carbonyl iron, ferrite, sendust, or amorphous alloys are used as soft magnetic materials used in high-frequency transformers, magnetic cores of choke coils, and the like. When these soft magnetic materials are used for the magnetic core, in order to increase the resistance in the high-frequency region, a method of solidifying the powder of the soft magnetic material through an insulating layer to form a soft magnetic compact can be used. For example, it has also been proposed to use low-melting-point glass as a binder for soft magnetic materials and perform powder compaction to form a compact (see JP-A-63-158810), or use low-melting-point glass and resin A method in which it is used as a binder and compacted, and then fired to burn ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/24H01F41/02B22F1/02H01F1/153H01F1/26
CPCY10T428/2998H01F41/0246H01F1/15375H01F1/26Y10T428/2949Y10T428/2991Y10T428/32
Inventor 松川清乔石原耕三上本育男谷口真佐文
Owner NTN CORP
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