Laminate of magnetic base material and method for production thereof

A technology of magnetic substrates and manufacturing methods, applied in the direction of magnetic materials, magnetic objects, and the magnetism of inorganic materials, can solve problems such as retention, lower rated power, and disadvantages, and achieve high duty cycle, high thermal conductivity, and temperature rise low effect

Inactive Publication Date: 2006-11-01
NAKAGAWA SPECIAL STEEL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, WO 03 / 060175 (Patent Document 3) describes a laminate of a magnetic base material composed of an amorphous metal and a polymer compound, but there is no description about problems such as heat generation when it is actually used.
[0004] However, even if any of these methods is used, if it is desired to positively seek electrical insulation, when the film thickness of the polymer compound layer is thickened so that the thin metal plates for eddy current suppression do not contact each other, the magnetic metal will The volume ratio (fill factor) occupied by the laminate will also become lower
In addition, when a laminate is used as a magnetic core, heat is generated due to iron loss, but the thermal conductivity of resin is generally 10 to 100 times lower than that of metal, so it is disadvantageous in terms of heat dissipation through the resin layer. The problem that heat tends to stay in the laminate as the resin layer thickens
When using conventional magnetic laminates as magnetic cores, the rated power becomes lower, so this problem hinders miniaturization and higher output.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] As the magnetic thin metal plate, Metglas: 2605TCA (trade name) manufactured by Hanewell Co., Ltd. was used. 78 B 13 Si 9 (atomic %) thin strips of amorphous metal. Use a roll coater to coat a polyamic acid solution with a viscosity of about 0.3 Pa·s at 25°C measured by an E-type viscometer on the entire surface of one side of an amorphous metal strip, dry it at 140°C, and then dry it at 260°C. It is solidified at ℃, and a heat-resistant resin (polyimide resin) of about 4 microns is formed on one side of the amorphous metal strip. Polyimide resin is mixed with 3,3'-diaminodiphenyl ether and 3,3',4,4'-biphenyltetracarboxylic dianhydride in the ratio of 1:0.98, in dimethylacetamide solvent A resin obtained by polycondensation at room temperature. Usually, polyamic acid is used as a diacetamide solution.

[0051] In addition, the resin-coated magnetic base material was cut into 50 mm squares, 50 sheets were stacked, and laminated under pressure at 270° C. and 10 MPa f...

Embodiment 2

[0056] As the magnetic thin metal plate, Metglas: 2714A (trade name) manufactured by Hanewell Co., Ltd. with a width of about 50 mm and a thickness of about 15 μm is used. 66 Fe 4 Ni 1 (BSi) 29 (atomic %) thin strips of amorphous metal. Use a roll coater to coat the polyamic acid solution with a viscosity of about 0.3 Pa·s at 25°C when measured by an E-type viscometer on the entire surface of one side of the thin strip, dry it at 140°C, and heat it at 260°C. Curing at the bottom to give a heat-resistant resin (polyimide resin) of about 4 microns on one side of the amorphous metal strip. Polyimide resin is mixed with 3,3'-diaminodiphenyl ether and 3,3',4,4'-biphenyltetracarboxylic dianhydride in the ratio of 1:0.98, in dimethylacetamide solvent obtained by polycondensation at room temperature. Usually, polyamic acid is used as a diethylamide solution.

[0057] In addition, the resin-coated magnetic base material was cut into 30 mm squares, and 50 pieces were stacked, and ...

Embodiment 3

[0061] As the magnetic metal thin plate, a nanocrystalline magnetic metal ribbon having a composition of Fe, Cu, Nb, Si, and B elements, Fe, Cu, Nb, Si, and B, was used as Fe, Cu, Nb, Si, and B elemental Fe, Cu, Nb, Si, and B. Coat the same resin as in Example 1 to make a magnetic substrate, cut it into a square of 30 mm, overlap 50 pieces, pressurize for 30 minutes at 270 ° C and 10 MPa in a nitrogen atmosphere, and then laminate and integrate it. Heat treatment at 550°C and 1Mpa for 1.5 hours. Then, for evaluation, the space factor and the volume resistivity prescribed by JIS H 0505 were measured. In addition, the thermal conductivity specified in JIS R 1611 was measured.

[0062]In order to measure the temperature rise when an alternating magnetic field is applied, the magnetic base material of this example is punched into a ring shape with an outer diameter of 40mm and an inner diameter of 25mm with a metal mold. Next, pressurize with a hot press for 30 minutes to carry ...

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Abstract

With respect to a laminate of a magnetic base material composed of a magnetic thin metal sheet and a polymer, to provide a laminate of a magnetic base material having an enhanced coefficient of thermal conductivity, since a conventional such laminate has a low coefficient of thermal conductivity and thus exhibits poor heat releasing property when the dissipation of the heat due to iron loss is intended. [MEANS FOR SOLVING PROBLEMS] Use is made of a laminate of a magnetic base material composed of a polymer layer and a magnetic thin metal sheet, characterized in that it has a coefficient of the volume resistance defined in JIS H 0505 in the direction perpendicular to the surface of the polymer layer of the laminate of less than 10<8> ohmcm. Said laminate can provide, when it is pressed, electroconductive points between the magnetic thin metal sheets, through the ejection of the polymer in the laminate to the outside thereof.

Description

technical field [0001] The present invention relates to a thin magnetic metal plate provided with a polymer compound, a laminate of the thin magnetic metal plate, and a method for producing the same. Background technique [0002] Conventionally, when a magnetic metal material is used as a thin plate, a plurality of single-plate thin plates are laminated and used. As such a method of use, for example, in the case of using an amorphous metal thin strip as a magnetic metal material, since the thickness of the amorphous thin strip is about 10 to 50 μm, the operation is to uniformly coat its surface with Cloth-specific adhesives or dipped in adhesives to laminate them. Japanese Unexamined Patent Publication No. 58-175654 (Patent Document 2) describes a method for producing a laminate, which is characterized in that an amorphous film coated with an adhesive mainly composed of a heat-resistant polymer compound is The tapes are overlapped, crimped with pressure rollers, and bonded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/245B32B15/08G11B5/64H01F1/153H01F3/02H01F27/24
CPCH01F1/15333H01F1/15375Y10T156/1092Y10T428/32Y10T428/325B82Y25/00H01F1/12H01F1/153H01F3/02
Inventor 吉田光伸丸子展弘渡边洋
Owner NAKAGAWA SPECIAL STEEL CO
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