Soft magnetic body composition, manufacturing method thereof, magnetic core, and coil-type electronic component

A manufacturing method and technology of soft magnetic alloy, applied in the direction of magnetic objects, transformer/inductor parts, magnetic materials, etc., can solve the problem of lack of strength of molded products, and achieve the effect of reducing the deterioration of the mold and improving the productivity

Active Publication Date: 2014-07-23
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, Fe-Si-Cr-based alloys have the problem of not being able to obtain sufficient strength in molded products on the contrary of their excellent formability and workability.

Method used

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  • Soft magnetic body composition, manufacturing method thereof, magnetic core, and coil-type electronic component
  • Soft magnetic body composition, manufacturing method thereof, magnetic core, and coil-type electronic component
  • Soft magnetic body composition, manufacturing method thereof, magnetic core, and coil-type electronic component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0097] About Sample 1

[0098] [Preparation of soft magnetic alloy powder]

[0099] First, ingots, bulks (blocks) or pellets (granules) of Fe simple substance, Cr simple substance, and Si simple substance are prepared. Next, these were mixed so as to have a composition of 88.5% by mass of Fe, 5% by mass of Cr, and 6.5% by mass of Si, and were accommodated in a crucible placed in a water atomization device. Next, in an inert atmosphere, using a working coil installed outside the crucible, the crucible is heated to above 1600°C by high-frequency induction, and the ingots, chunks or pellets in the crucible are melted and mixed to obtain a melt.

[0100] Next, the melt in the crucible is ejected from the nozzle installed in the crucible, and at the same time, the ejected melt is rapidly cooled by colliding with a high-pressure (50 MPa) water flow, and the Fe-Si-Cr-based particles are produced. Soft magnetic alloy powder (average particle size: 50μm).

[0101] As a result of a...

Embodiment 2）

[0123] Regarding samples 3 and 4

[0124] Sample 3 produced powder magnetic powder in the same manner as sample 1, except that soft magnetic alloy powder composed of 85% by mass of Fe, 5.5% by mass of Al, and 9.5% by mass of Si was used as the soft magnetic alloy powder. Core samples were subjected to the same evaluation. The results are shown in Table 1.

[0125] In addition, in Sample 4, in addition to using a soft magnetic alloy powder composed of 85% by mass Fe, 5.5% by mass Al, and 9.5% by mass Si as the soft magnetic alloy powder, a non-silicone-based resin (Nagase Kasei Co., Ltd. (manufactured by Co., Ltd.: DENATITE XNR4338) was used as a binder resin, and a powder magnetic core sample was prepared in the same manner as in Sample 3, and the same evaluation was performed. The results are shown in Table 1.

[0126] As shown in Table 1, it was confirmed that in sample 3, a layer containing Si was formed at the grain boundary. However, it was confirmed that sample 3 c...

Embodiment 3）

[0129] About samples 5 to 14

[0130] For samples 5 to 14, except that the composition of the soft magnetic alloy particles was changed so as to have the composition shown in Table 2, powder magnetic core samples were prepared in the same manner as sample 1, and the same evaluation was performed. The results are shown in Table 2.

[0131] [Table 2]

[0132]

[0133] As shown in Table 2, it was confirmed that when the soft magnetic alloy particles satisfy the specified composition specified in the present invention, powder magnetic cores having sufficient strength and excellent magnetic properties can be obtained (samples 6 to 9, 12 and 13).

[0134] On the other hand, it was confirmed that in the case where the soft magnetic alloy particles do not satisfy the prescribed composition specified in the present invention, at least one of the strength and magnetic properties of the obtained powder magnetic core deteriorates (test samples 5, 10, 11 and 14).

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Abstract

The present invention aims to provide a soft magnetic body composition and a manufacturing method thereof, by which molded products have enough strength and load to a mould during molding can be reduced, a magnetic core and a coil-type electronic component. The soft magnetic body composition has a plurality of soft magnetic alloy particles and a crystal boundary disposed among the soft magnetic alloy particles, the soft magnetic alloy particles have 1.5-8 mass% of Cr according to Cr conversion, 1.4-9 mass% of Si according to Si conversion, the balance being Fe, and the crystal boundary is provided with a Si-containing layer.

Description

technical field [0001] The present invention relates to a soft magnetic composition, a method for producing the same, a magnetic core, and a coil-type electronic component. Background technique [0002] Metal magnetic materials have the advantage of being able to obtain a higher saturation magnetic flux density than ferrite. As such metal magnetic bodies, Fe—Si—Al alloys, Fe—Si—Cr alloys, and the like are known. [0003] In general, Fe-Si-Al-based alloys have a harder oxide layer on the surface and are inferior in formability, workability, and high density compared to Fe-Si-Cr-based alloys. Such Fe—Si—Al alloys have a problem that a large pressure must be applied at the time of forming, and thus deterioration of the mold is rapid. [0004] Therefore, reduction of molding pressure is required, and in recent years, powder magnetic cores utilizing the characteristics of Fe—Si—Cr alloys excellent in formability and workability have been used. In Patent Document 1, a coil-type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/22H01F27/255
Inventor 村上睦义城户修伊藤纲伊藤守山崎恒裕松野谦一郎佐佐木弘胜高木荣光中村和广村瀬琢
Owner TDK CORPARATION
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