Iron Powder for Powder Magnetic Core

A powder magnetic core and iron powder technology, applied in the direction of magnetic core/yoke, magnetic materials, magnetic objects, etc., can solve the problem of limited freedom and achieve low hysteresis loss

Active Publication Date: 2017-07-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetic steel sheets are laminated to form a magnetic core, so the degree of freedom in shape is limited

Method used

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  • Iron Powder for Powder Magnetic Core
  • Iron Powder for Powder Magnetic Core
  • Iron Powder for Powder Magnetic Core

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Effect test

Embodiment 1

[0075] The iron powder used in this embodiment is set to be 10 kinds of atomized pure iron powders with different apparent density, D50, crystal grain size, amount of inclusions and micro-Vickers hardness.

[0076] In addition, the apparent density is 3.8g / cm 3 The above iron powder is gas atomized iron powder, the apparent density is lower than 3.8g / cm 3 The iron powder is water atomized iron powder. Regarding the composition, any powder is C<0.005 mass%, O<0.10 mass%, N<0.002 mass%, Si<0.025 mass%, P<0.02 mass%, S <0.002% by mass.

[0077] [Table 1]

[0078] Table 1

[0079]

[0080] These powders were subjected to insulating coating with a silicone resin. The silicone resin was dissolved in toluene to prepare a resin diluted solution so that the resin content was 0.9% by mass, and then, the powder was mixed with the resin diluted solution so that the addition rate of the resin to the powder was 0.15% by mass. Allow to air dry. After drying, a resin sintering treatmen...

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Abstract

According to the present invention, the iron powder for dust cores has an apparent density of 3.8 g / cm3 or more and an average particle diameter (D50) of 80 μm or more, and more than 60% of the powder inside the powder with a particle diameter of 100 μm or more The crystal grain size of the powder is 80 μm or more, the area percentage of inclusions in the area of ​​the powder parent phase is 0.4% or less, and the micro Vickers hardness (test force: 0.245N) of the powder section is 90Hv or less. Accordingly, it is possible to obtain an iron powder for a powder magnetic core for producing a powder magnetic core having a low hysteresis loss even after the iron powder is molded and subjected to stress relief annealing.

Description

technical field [0001] The present invention relates to an iron powder for a powder magnetic core used for producing a powder magnetic core having a large crystal grain size and low hysteresis loss even after molding and stress relief annealing. Background technique [0002] Magnetic cores used in motors, transformers, and the like are required to have characteristics such as high magnetic flux density and low iron loss. Conventionally, cores in which magnetic steel sheets are laminated have been used as such cores, but in recent years, dust cores have attracted attention as core materials for electric motors. [0003] The biggest feature of the dust core is that it can form a three-dimensional magnetic circuit. Magnetic steel sheets are laminated to form a magnetic core, so the degree of freedom in shape is limited. However, in the case of a powder magnetic core, since insulation-coated soft magnetic particles are pressurized and molded, as long as there is a die, a degre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C38/00H01F1/24B22F1/05
CPCC22C38/00H01F1/24C22C2202/02B22F1/05B22F1/052C22C38/001C22C38/004H01F1/147H01F1/20H01F3/08
Inventor 高下拓也中村尚道
Owner JFE STEEL CORP
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