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Iron-base soft magnetic powder for dust cores, manufacturing method thereof, and dust core

A powder magnetic core and manufacturing method technology, applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, transformer/inductance parts, etc., can solve the problems of high-density pigments, improve heat resistance, The effect of low iron loss

Active Publication Date: 2014-02-26
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology uses more than 1% by mass (relative to iron powder) of resin in order to ensure thermal stability, and there is room for improvement in terms of high-density molding.
In addition, in order to ensure heat resistance, it has also been proposed to add glass powder and pigment to the silicone resin (Patent Document 2, Patent Document 3, etc.), but there is a problem that the increase in density of the pigment is hindered by the addition of glass powder. question

Method used

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  • Iron-base soft magnetic powder for dust cores, manufacturing method thereof, and dust core
  • Iron-base soft magnetic powder for dust cores, manufacturing method thereof, and dust core
  • Iron-base soft magnetic powder for dust cores, manufacturing method thereof, and dust core

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1～12、16～20

[0084] (formation of phosphoric acid-based chemical film)

[0085] As the soft magnetic powder, pure iron powder (manufactured by Kobe Steel Works; ATMEL (registered trademark) ML35N; average particle diameter 140 μm; iron-based soft magnetic powder containing 0% by mass of aluminum element and nickel element) was used.

[0086] In addition, as the phosphoric acid solution, the following treatment solution was used: in the water: 50 parts, KH 2 PO 4 : 35 parts, H 3 PO 4 : 10 copies, (NH 2 Oh) 2 ·H 2 PO 4 : Into 100ml of matrix drug A obtained by mixing 10 parts, mix a compound containing nickel element (nickel pyrophosphate and / or nickel nitrate) with the formulation shown in Table 1, and further dilute to 10 times with water to obtain the treatment solution 1~ 12. 16 to 20 (the content of the aluminum element is 0% by mass). It should be noted that Experimental Example 1 is an example in which the compound containing nickel element is not mixed with the base drug A. ...

experiment example 13～15、21

[0098] In Experimental Example 1, as the phosphoric acid solution, instead of the treatment liquid 1, the following phosphoric acid solution was used in water: 50 parts, NaH2 PO 4 : 30 parts, H 3 PO 4 : 10 parts, (NH 2 Oh) 2 ·H 2 SO 4 : In 100 parts of mixed base agent B100ml, mix nickel pyrophosphate and / or nickel nitrate with the formula shown in Table 1, and further dilute to 10 times with water to obtain the treatment solution 13~15, 21 (aluminum element Except that the content rate was 0% by mass), the same operation as in Experimental Example 1 was carried out to produce green compacts 13 to 15 and 21 . In addition, Experimental Example 13 is an example in which no nickel pyrophosphate and / or nickel nitrate was mixed with the base drug B.

[0099] Then, the powder compacts 13 to 15 were annealed at 600° C. for 30 minutes in a nitrogen atmosphere to produce the powder magnetic cores 13 to 15 . The rate of temperature increase when heating to 600°C was set to about ...

experiment example 22

[0101] In Experimental Example 1, as the phosphoric acid solution, the following phosphoric acid solution was used instead of the treatment liquid 1 in water: 50 parts, H 3 PO 4 : 40 parts, (NH 2 Oh) 2 ·H 2 SO 4 : In 100 ml of the matrix agent C100 ml obtained by mixing, nickel pyrophosphate was mixed with the formulation shown in Table 1, and further diluted with water to 10 times the obtained treatment solution 22 (the content rate of aluminum element was 0 mass %), except Otherwise, the same operations as in Experimental Example 1 were carried out to produce a green compact 22 . Next, the powder compact 22 was heat-treated at 400° C. for 120 minutes in the air atmosphere, and then annealed at 550° C. for 30 minutes to manufacture the powder magnetic core 22 . The temperature increase rate at the time of heating from 400°C to 550°C was set to about 10°C / min.

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Abstract

This iron-base soft magnetic powder for dust cores comprises a phosphate conversion film formed on the surface of the iron-base soft magnetic powder, wherein the phosphate conversion film contains the element nickel, and the content ratio of the element aluminum in the phosphate conversion film is less than or equal to the content ratio of aluminum in the aforementioned powder. Excellent thermal stability enables maintaining electrical insulation properties even when subjected to high-temperature heat treatment.

Description

technical field [0001] The present invention relates to iron-based soft magnetic materials for powder magnetic cores in which an insulating film with high heat resistance is laminated on the surface of soft magnetic powder such as iron powder or iron-based alloy powder (hereinafter, both are combined and simply referred to as iron powder). powder, and by compression-molding the iron-based soft magnetic powder for the powder magnetic core, a powder magnetic core used as a magnetic core for electromagnetic parts can be obtained. The powder magnetic core of the present invention is excellent in mechanical strength and the like, and is especially excellent in electrical resistivity at high temperature. Background technique [0002] For a magnetic core used in an AC magnetic field, low iron loss and high magnetic flux density are required. In addition, it is also important that the workability in the manufacturing process is excellent, and that there is no damage when the wire i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F3/00B22F3/24H01F1/24H01F27/255B22F1/00B22F1/102B22F1/16
CPCB22F1/02H01F41/02B22F2998/10H01F41/0246H01F27/255H01F1/24H01F1/26H01F1/20C22C33/02B22F1/16B22F1/00B22F1/102B22F3/02B22F2003/248
Inventor 细川护漆原亘大胁武史上条友纲北条启文
Owner KOBE STEEL LTD
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