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Composite soft magnetic material and production method therefor

A soft magnetic composite material, soft magnetic powder technology, applied in inductor/transformer/magnet manufacturing, inorganic material magnetism, transportation and packaging, etc., can solve the problems of DC superposition characteristics deterioration, soft magnetic characteristics deterioration, silicone resin damage and other problems , to achieve good DC superposition characteristics, suppress eddy current loss, and have no thickness segregation effects

Inactive Publication Date: 2014-07-30
DIAMET CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, when the silicone resin is hard, sufficient gaps are formed between the soft magnetic powder particles, thereby obtaining good DC superposition characteristics, but the silicone resin is damaged during molding, which in turn leads to failure until the package is closed. Defects in the insulating film covering the soft magnetic material, resulting in a decrease in specific resistance and deterioration of soft magnetic properties, resulting in increased loss
On the other hand, when soft silicone resin is used, although good soft magnetic properties can be obtained due to high specific resistance, it is difficult to uniformly maintain the gaps between the soft magnetic powder particles during molding. Deterioration of DC superposition characteristics

Method used

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  • Composite soft magnetic material and production method therefor
  • Composite soft magnetic material and production method therefor
  • Composite soft magnetic material and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] As the soft magnetic powder, water-atomized pure iron powder (manufactured by Japan Hoganus Co., Ltd. S110i) with an average particle diameter of about 50 μm that has been subjected to phosphate coating treatment is used. As the silicone resin, tolyl-based (KR resin manufactured by Shin-Etsu Chemical Co., Ltd.) was used. In addition, as an inorganic insulating powder, use a specific surface area of ​​170 to 180m 2 / g and a hydrophobic silica powder (manufactured by Japan Aerosil Co., Ltd. R974) with an average particle diameter of about 12 nm.

[0051] First, the soft magnetic powder and the silicone resin of 0.7% by mass (the amount of the solute from which the solvent has been removed) are uniformly mixed with the soft magnetic powder, and dried at 50° C. for 5 hours while stirring, and then the used Silicone resin coated soft magnetic powder coating powder.

[0052] Next, the coating powder and 0.5% by mass of inorganic insulating powder relative to the soft magnet...

Embodiment 2

[0056] The timing of mixing inorganic insulating powder and its influence on the density, specific resistance and magnetic permeability of the sample were investigated. The same raw materials as in Example 1 were used as raw materials, and the conditions were the same as in Example 1 unless explicitly stated.

Embodiment C

[0058] First, soft magnetic powder and 0.7% by mass of silicone resin relative to the soft magnetic powder were uniformly mixed and dried while stirring to obtain a coated powder in which the soft magnetic powder was coated with the silicone resin.

[0059] Next, the coating powder and 0.5% by mass of inorganic insulating powder relative to the soft magnetic powder were uniformly mixed. The powder at this time, such as Figure 4 As shown in (a), the inorganic insulating powder adheres to the outside of the silicone resin coated with the soft magnetic powder.

[0060] Further, add 0.8% by mass of lubricant relative to the soft magnetic powder, and the mixture is molded at a molding pressure of 8t / cm 2 or 12t / cm 2 After molding, firing was carried out for 30 minutes in a nitrogen atmosphere at 620°C.

[0061] Through the above operations, prepare respectively A ring-shaped sample was wound with a coil (the number of coils N=50 turns), and the inductance was measured by usin...

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Abstract

Provided are a composite soft magnetic material, having favorable DC bias characteristics and high specific resistance, and a production method therefor. An inorganic insulative powder (3) and a coated powder obtained by coating a soft magnetic powder (1) that is coated with an insulative film (4) with a silicone resin (2) are uniformly mixed, and the resultant mixture is molded and fired. By uniformly mixing the inorganic insulative powder (3) and the coated powder obtained by coating the soft magnetic powder that is coated with the insulative film (4) with the silicone resin (2), rupture of the insulative film due to the inorganic insulative material when molding pressed powder is prevented. By uniformly dispersing the inorganic insulative material while high specific resistance is maintained, the gap between molded soft magnetic powder particles is uniformly maintained. As a result, a composite soft magnetic material is provided having high specific resistance and favorable DC bias characteristics.

Description

technical field [0001] The invention relates to a soft magnetic composite material with good direct current superposition characteristics and a manufacturing method thereof while maintaining high specific resistance. Background technique [0002] As iron cores such as reactors, laminated silicon steel sheet cores, ferrite cores, and dust cores have been used for a long time. In laminated silicon steel sheets, in order to prevent eddy currents, it is necessary to make the laminated magnetic silicon steel sheets as thin as possible. However, the thinning of the magnetic silicon steel sheet is limited, and there is also a problem that the thinning increases the production cost. In addition, since ferrite cores and powder cores have low saturation magnetic flux densities, inductance decreases in applications with large currents, and in order to avoid this, there is a problem of increasing the size. [0003] From this background, it is turned to the method of using a material t...

Claims

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Application Information

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IPC IPC(8): H01F1/20B22F1/00B22F1/02B22F3/00B22F3/02B22F3/24H01F1/26H01F1/33H01F41/02B22F1/05B22F1/102B22F1/16
CPCH01F1/26H01F1/33H01F1/24B22F1/05B22F1/16B22F1/102
Inventor 小林直树宫原正久森克彦池田裕明
Owner DIAMET CORP
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