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Metallic powder for powder magnetic core and process for producing powder magnetic core

A technology of powder magnetic core and metal powder, which is used in inductor/transformer/magnet manufacturing, metal processing equipment, inorganic material magnetism, etc., and can solve the problems of increased eddy current loss and reduced resistance.

Active Publication Date: 2011-10-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conversely, if the heat treatment temperature is high, the insulating material covering the surface of the particles decomposes or crystallizes, and the resistance between the particles decreases, resulting in an increase in eddy current loss.
[0011] Furthermore, if the adhesion between the insulating material and the particles is poor, the insulating coating may be peeled off during molding, and a decrease in electrical resistance may occur at this stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] As raw material powder, atomized (atomized) pure iron powder (Concentration of Fe: 99.8 mass %, remainder impurity (Si: 0.01%)) shown in Table 1 was prepared. The average particle size, the minimum particle size and the maximum particle size of the powder are the particle sizes of 50%, 1%, and 99% of the accumulated particle size distribution measured by a laser scattering diffraction particle size distribution measuring device, respectively.

[0085] The following gas phase reaction treatment is carried out: these powders are filled in a quartz container with a loading thickness of 3 mm, heated at 600 to 1420 ° C in argon for 5 minutes, and silicon chloride gas is circulated at a flow rate of 20 Nl / min / kg 1 to 10 minutes (only No. 14 was circulated at 75 Nl / min / kg for 30 minutes) while maintaining a predetermined temperature, and further replaced with argon, followed by heat treatment for 3 minutes.

[0086] Table 1 shows the heating temperature of each powder, in SiCl...

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PUM

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Abstract

A pure iron powder of a diameter of 10 to 500 [mu]m and a purity of 99% by mass or more is heated to a temperature in the range of 600 to 1400 DEG C, and a Si-concentrated layer is formed in regions within a depth of 5 mu m from the surfaces of the powder particles by gas-phase reaction at a temperature of that range. The average Si concentration in the regions within this depth is controlled in the range of 0.05% to 2% by mass. Thus, a dust core metal powder enhancing the adhesion of insulating material to the particle without degrading compressibility is produced. The resulting dust core maintains a high saturation magnetic flux density and exhibits a low iron loss.

Description

technical field [0001] The present invention relates to a method for producing a metal powder for a dust core suitable as a raw material for a magnetic core of a motor or a transformer. Furthermore, the present invention relates to a method of manufacturing a powder magnetic core using the metal powder. Background technique [0002] As a core material for a motor or a transformer, a so-called soft magnetic material that is easily magnetized in a small magnetic field is used. For the soft magnetic material, in addition to requiring a high Curie temperature, many characteristics such as low coercive force, high magnetic permeability, high saturation magnetic flux density, and low loss (low core loss) are also required. [0003] Soft magnetic materials satisfying these requirements are roughly classified into metal soft magnetic materials and oxide soft magnetic materials, which are used according to frequency and electric power. [0004] Oxide soft magnetic materials represe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F1/02B22F3/00B22F3/24H01F1/20H01F41/02B22F1/145B22F1/16
CPCB22F2998/10B22F1/02B22F1/0088H01F41/0246H01F1/24B22F2998/00H01F1/33B22F3/12B22F1/145B22F1/16B22F2201/40
Inventor 藤田明平谷多津彦前谷敏夫
Owner JFE STEEL CORP
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