JP2003073883A - Electrodeposited iron film for high-frequency, insulated wire for high-frequency coil, and manufacturing method for these - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare an electrodeposited iron film for high-frequency, having a small high-frequency resistance loss, to provide an insulated wire for a high-frequency coil, which can form a coil for high-frequency having a small high-frequency resistance loss and high Q, and provide manufacturing methods therefor. SOLUTION: An alternatingly electrodeposited film (the electrodeposited iron film for high-frequency) 8 comprising six layers in total consisting of three iron layers (2, 4, and 6) of 0.03 μm thick for each, and three nickel layers (3, 5, and 7) of 0.02 μm thick for each, is prepared on a perimeter of a copper conductor 1 by means of alternately electrodepositing iron and nickel. The polyurethane copper wire for the high-frequency coil (the insulated wire for the high-frequency coil) 10 is then manufactured by means of applying a polyurethane lacquer on the above electrodeposited film and baking it, to provide a polyurethane film 9 with thickness of 5 μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency iron electrodeposition film, a high-frequency coil insulated wire, and a method for producing the same, and more particularly to a high-frequency iron electrodeposition film having a low high-frequency resistance loss and a high-frequency resistance loss. The present invention relates to an insulated wire for a high-frequency coil, which is capable of producing a high-frequency coil having a small and high high-frequency gain Q value (hereinafter abbreviated as high Q value), and a manufacturing method thereof.

[0002]

2. Description of the Related Art Recently, as electronic devices have become lighter, thinner, shorter, smaller, and have higher performance, the frequency of coil components of micro magnetic devices and bulk magnetic devices used therein has been rapidly increasing. It is known that a high Q value can be obtained by using an insulation-coated electric wire in which a ferromagnetic material such as iron is electrodeposited on the outer periphery of a copper conductor, and an enamel paint is applied and baked on the outer periphery of the coil component. . In addition, after electrolytically depositing a ferromagnetic material such as iron, a nickel electrodeposited film is applied to the outer periphery, and an enamel paint having solderability is applied and baked on the outer periphery. It is put to practical use as a magnetic plated wire for a high-frequency coil that also has this function. (Jpn. Pat. Appln. KOKAI Sho 42-1339, JP 62-151594 A)

[0003]

However, although the above-described magnetic plating wire adjusts the film thickness of the ferromagnetic material layer to cope with high frequency, it is possible that the ferromagnetic material layer (film) is composed of a single layer film. However, there is a problem that the miniaturization, lightness, shortness and high performance in the frequency band up to 10 MHz are limited. In addition, when using the magnetic plating wire in the high frequency band, it is inevitable that the ferromagnetic film will be made thinner, but since the output is small with a single layer film, a thin film magnetic material should be used to satisfy the electrical characteristics of the device. It is necessary to laminate. Therefore, many studies have been conducted on multilayer films in which a ferromagnetic material and a non-magnetic material are laminated. The intention of forming a multilayer film is to simplify the magnetic domain of the magnetic film by the magnetic interaction between the upper and lower magnetic layers sandwiching the non-magnetic layer and improve the soft magnetic characteristics of the magnetic film. Furthermore, thinning of the magnetic layer reduces eddy current loss, and the magnetic permeability extends to the high frequency band.These are all researches on magnetic elements, and research on coil parts is completely nonexistent. there were. As a result, as a matter of course, there is a problem that the detailed explanation is not given.

The present invention has been made in order to solve various problems of the above-mentioned prior art, and has a high-frequency iron electrodeposition film having a small high-frequency resistance loss and a high-frequency resistance loss and a high Q value. It is an object of the present invention to provide an insulated wire for a high frequency coil, which is capable of producing a high frequency coil having the above, and a method for manufacturing these.

[0005]

As a first aspect, the present invention is a high frequency iron electrodeposition film in which iron and nickel are alternately electrodeposited on the outer periphery of a copper conductor to form an iron-nickel alternate electrodeposition layer. The iron-nickel alternating electrodeposition layer (film) (hereinafter abbreviated as alternating electrodeposition layer (film)) is composed of 6 or more and 12 or less layers It is on the electrodeposition film. In the high frequency iron electrodeposition film of the first aspect, in the high frequency iron electrodeposition film in which iron and nickel are alternately deposited on the outer periphery of the copper conductor,
Since the alternating electrodeposition layer is a high frequency iron electrodeposited film composed of 6 to 12 layers, the iron electrodeposited film has a small high frequency resistance loss. When the alternating electrodeposition layers are smaller than 6, the magnetic interaction between the upper and lower magnetic layers sandwiching the non-magnetic layer is hard to be obtained, and the soft magnetic characteristics of the magnetic film are not improved. When the alternating electrodeposition layer is larger than 12 layers,
Although the soft magnetic characteristics are improved, the characteristics of the multi-layered structure are saturated, and the number of manufacturing steps is increased, which causes an increase in cost, which is not preferable.

As a second aspect of the present invention, the iron film thickness X (μm) of the iron-nickel alternating electrodeposition layer is 0.02 ≦ X ≦ 0.0.
5, nickel film thickness y (μm) is 0.01 ≦ y ≦ 0.03
It is an iron electrodeposited film for high frequencies, characterized in that it is composed of In the high frequency iron electrodeposition film of the second aspect, in the high frequency iron electrodeposition film in which iron and nickel are alternately deposited,
The iron film thickness X (μm) of the alternating electrodeposition layer was 0.02 ≦ X ≦ 0.
The range of 05 is preferable. The iron film thickness X is 0.02 μm
If the film thickness is smaller, it is difficult to completely cover the outer circumference due to irregularities due to the surface of the base copper, etc. Therefore, improvement in high frequency characteristics cannot be obtained. Further, when the iron film thickness X is thicker than 0.05 μm, it is difficult to extend the magnetic permeability to the high frequency band.
Since the obtained iron electrodeposited film is relatively hard, it has poor flexibility, and defects such as fine cracks are likely to occur, and improvement in high frequency characteristics cannot be obtained. Further, the nickel film thickness y (μm) is 0.
The range of 01 ≦ y ≦ 0.03 is preferable in terms of solderability and high frequency characteristics. When the nickel film thickness y is smaller than 0.01 μm, sufficient soldering joint cannot be obtained, and when the nickel film thickness y is larger than 0.03 μm, the magnetic properties of iron are impaired and good high frequency properties are obtained. Absent.

As a third aspect, the present invention is characterized in that the high frequency iron electrodeposited film is heat-treated at a temperature of 300 ° C. to 800 ° C. to relax the electrodeposition stress. On the membrane. In the high-frequency iron electrodeposited film according to the third aspect, heat treatment in a temperature range of 300 ° C. to 800 ° C. to relax the electrodeposition stress can relax the plating stress due to impurities such as hydrogen co-deposited during electrodeposition. Thereby, the soft magnetic characteristics are improved. It should be noted that heat treatment having a long time such as 2 hours at a high temperature of more than 800 ° C. promotes the thermal diffusion reaction of iron and nickel to form a single-layer alloy layer, resulting in poor properties. Further, heat treatment at a temperature lower than 300 ° C. makes it difficult to remove hydrogen in a short time, so that stress is not relaxed.

A fourth aspect of the present invention is the insulated wire for a high frequency coil, characterized in that an enamel insulating resin layer having solderability is provided on the outer periphery of the high frequency iron electrodeposited film. In the insulated wire for a high frequency coil according to the fourth aspect,
By providing an enamel insulating resin layer having solderability on the outer periphery of the high frequency iron electrodeposited film (hereinafter, abbreviated as solderability enamel insulating resin layer), good electrical insulation and solderability can be obtained. Therefore, it can be suitably used as a wire material for a high frequency coil.

A fifth aspect of the present invention is the method for producing a high frequency iron electrodeposited film according to the first aspect, wherein iron and nickel are alternately electrodeposited on the outer periphery of the copper conductor by electroplating, A method for producing a high-frequency iron electrodeposited film is characterized in that the iron-nickel alternating electrodeposition layers are provided in the range of 6 to 12 layers. In the method for producing a high frequency iron electrodeposited film according to the fifth aspect, iron and nickel are alternately electrodeposited by electroplating, and 6 to 12 iron-nickel electrodeposited layers are provided.
The iron deposition film for high frequency from the viewpoint can be efficiently manufactured.

A sixth aspect of the present invention is the method for producing a high frequency iron electrodeposited film according to the second aspect, wherein the iron film thickness X (μm) of the iron-nickel alternating electrodeposition layer is formed by electroplating. )
Is set to 0.02 ≦ X ≦ 0.05, and a nickel film thickness y (μm) is set to 0.01 ≦ y ≦ 0.03. In the method for producing a high frequency iron electrodeposited film according to the sixth aspect, the iron film thickness X (μm) of the iron-nickel alternating electrodeposition layer is 0.02 ≦ X ≦ 0.0 by electroplating.
5, nickel film thickness y (μm) 0.01 ≦ y ≦ 0.03
By providing, the high-frequency iron electrodeposited film of the second aspect can be efficiently manufactured.

A seventh aspect of the present invention is the method for producing a high frequency iron electrodeposited film according to the third aspect, wherein the high frequency iron electrodeposited film is 300 ° C. in a non-oxidizing gas atmosphere. It is a method for producing an iron electrodeposited film for high frequency, which is characterized in that the electrodeposition stress is relaxed by heat treatment at a temperature of 1 to 800 ° C. Examples of the non-oxidizing gas include nitrogen gas and hydrogen gas. In the method for producing a high frequency iron electrodeposited film according to the seventh aspect, the high frequency iron electrodeposited film according to the third aspect can be efficiently produced. By heat-treating the high frequency iron electrodeposited film in a non-oxidizing gas atmosphere at a temperature of 300 ° C. to 800 ° C., electrodeposition stress is relaxed, and plating stress due to impurities such as hydrogen co-deposited during electrodeposition is relaxed. As a result, the soft magnetic characteristics are improved. It should be noted that heat treatment having a long time such as 2 hours at a high temperature of more than 800 ° C. promotes the thermal diffusion reaction of iron and nickel to form a single-layer alloy layer, resulting in poor properties. Further, heat treatment at a temperature lower than 300 ° C. makes it difficult to remove hydrogen in a short time, so that stress is not relaxed.
Further, by using a non-oxidizing gas, the surface of the iron electrodeposited film is prevented from being oxidized.

As an eighth aspect, the present invention provides a method for manufacturing an insulated wire for a high frequency coil according to the fourth aspect,
The enamel coating having solderability is applied and baked on the outer periphery of the high-frequency iron electrodeposited film obtained by the method for producing a high-frequency iron electrodeposited film according to any one of the fifth to seventh aspects, and then soldered. A method for producing an insulated wire for a high-frequency coil, characterized in that a insulated enamel insulating resin layer is provided to provide an insulated wire for a high-frequency coil. In the method for producing an insulated wire for a high frequency coil according to the eighth aspect, the insulating material for a high frequency coil according to the fourth aspect is formed by applying and baking an enamel coating having solderability to the outer periphery of a high frequency iron electrodeposited film. The electric wire can be efficiently manufactured.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The contents of the present invention will be described below in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this. FIG. 1 is a cross-sectional view showing an example of a high frequency iron electrodeposited film and a high frequency coil insulated wire of the present invention. FIG. 2 is a chart showing iron-nickel alternating electrodeposition layer forming conditions and heat treatment conditions. FIG. 3 is a chart showing the relationship between the high frequency resistance loss of the air core coil and the frequency. Further, FIG. 4 is a chart showing the relationship between the Q value of the air-core coil and the frequency. In these figures, 1 is a copper conductor (copper wire), 2, 4 and 6 are iron electrodeposited films (iron film), 3, 5 and 7 are nickel electrodeposited films (nickel film), 8 is high frequency iron electrode. Deposition film (iron-
Nickel alternating electrodeposition film), 9 is a polyurethane film (solderable enamel insulating resin layer), and 10 is a polyurethane copper wire for high frequency coils (insulated electric wire for high frequency coils).

-First Embodiment (Example 1) -Example 1 will be described with reference to FIG. 1 and Table 2.
Devices such as a furnace and a plating tank are not shown. A copper wire with an outer diameter of 0.10 mm (copper 99.9%) is run, annealed in a furnace, and then electrolytically degreased (main component: NaOH, 40
C.) and further pickled (main component: sulfuric acid, 25.degree. C.) to obtain a copper conductor 1. Next, the copper conductor 1 is run, immersed in an iron plating tank, energized, and an iron electrodeposition film having a thickness of 0.03 μm is obtained.
(Hereinafter, abbreviated as iron film) was obtained. Next, the copper conductor 1 on which the iron film 2 is formed is run, immersed in a nickel plating bath, and energized to obtain a nickel electrodeposition film (hereinafter abbreviated as nickel film) 3 having a thickness of 0.02 μm. It was After nickel plating, it was returned to the iron plating tank using a guide pulley, and an iron film 4 having a thickness of 0.03 μm was electrodeposited, and then a nickel film 5 having a thickness of 0.02 μm was electrodeposited. Then, in the same way as above,
An iron film 6 having a thickness of 0.03 μm is electrodeposited, followed by 0.02
A nickel film 7 having a thickness of μm was electrodeposited. Then, by alternating electrodeposition of iron-nickel, a total of 6 layers of the iron layer 3 layers (2, 4, 6) / nickel layer 3 layers (3, 5, 7) (high-frequency iron electrodeposition film) ) 8 was obtained. Subsequently, a polyurethane paint is applied and baked on the outer periphery of the alternate electrodeposition film 8 to form a polyurethane film (solderable enamel insulating resin layer) 9 having a thickness of 5 μm, and a polyurethane copper wire 10 for a high frequency coil 10 is formed.
(Insulated wire for high frequency coil) was manufactured. For the electroplating of iron, a mixed solution of ferrous sulfate and ferrous chloride adjusted to pH 3 with a liquid temperature of 25 ° C. was used, and high-purity iron was used for the anode. For the electroplating of nickel, a mixed solution of nickel sulfate and nickel chloride adjusted to pH 4 with a solution temperature of 40 ° C. was used, and a platinum-coated titanium electrode was used as the anode.

-Second Embodiment (Example 2) -According to the same method as in Example 1 and the conditions shown in detail in FIG. 2, a total of 8 alternating layers of 4 iron layers / 4 nickel layers. A deposited film (iron high frequency electrodeposition film) was obtained. Then, apply polyurethane paint on the outer periphery of the alternating electrodeposition film and bake it to 5 μm.
A polyurethane film having a thickness of m was provided to produce a polyurethane copper wire for a high frequency coil (insulated electric wire for a high frequency coil).

-Third Embodiment (Example 3) -According to the same method as in Example 1 and the conditions shown in detail in FIG. 2, a total of 10 alternating layers of 5 iron layers / 5 nickel layers. A deposited film (iron high frequency electrodeposition film) was obtained. Subsequently, the outer periphery of the alternating electrodeposition film was coated with polyurethane paint and baked,
By providing a polyurethane film having a thickness of μm, a polyurethane copper wire for high frequency coil (insulated electric wire for high frequency coil) was manufactured.

Fourth Embodiment (Example 4) -According to the same method as in Example 1 and the conditions shown in detail in Table 2, a total of 12 layers of 6 iron layers / 6 nickel layers are alternately charged. A deposited film (iron high frequency electrodeposition film) was obtained. Subsequently, the outer periphery of the alternating electrodeposition film was coated with polyurethane paint and baked,
By providing a polyurethane film having a thickness of μm, a polyurethane copper wire for high frequency coil (insulated electric wire for high frequency coil) was manufactured.

-Fifth Embodiment (Example 5) -According to the same method as in Example 1 and the conditions detailed in Table 2, a total of 6 layers of three iron layers / three nickel layers of alternating current. A deposited film was obtained. Then, heat treatment was performed in a hydrogen gas atmosphere at a heat treatment temperature of 400 ° C. for 5 minutes to relax the stress.
Subsequently, a polyurethane coating was applied and baked on the outer periphery of the stress-relaxed alternating electrodeposition film to form a polyurethane film having a thickness of 5 μm, and a polyurethane copper wire for a high frequency coil (insulated electric wire for a high frequency coil) was manufactured.

-Sixth Embodiment (Example 6) -According to the same method as in Example 1 and the conditions detailed in Table 2, a total of 6 layers of iron layers / 3 layers of nickel are alternately charged. A deposited film was obtained. Then, heat treatment was performed in a hydrogen gas atmosphere under the conditions of a heat treatment temperature of 800 ° C. for 2 seconds to relax the stress.
Subsequently, a polyurethane coating was applied and baked on the outer periphery of the stress-relaxed alternating electrodeposition film to form a polyurethane film having a thickness of 5 μm, and a polyurethane copper wire for a high frequency coil (insulated electric wire for a high frequency coil) was manufactured.

-Other embodiments (Examples 7 to 12)
Of an alternating electrodeposition film obtained by adjusting the iron layer, the nickel layer thickness and the number of layers, the heat treatment time and the temperature according to the conditions detailed in Table 2 according to the method of Example 1 above. A polyurethane coating was applied and baked on the outer periphery to form a polyurethane film having a thickness of 5 μm, and a polyurethane copper wire for a high frequency coil (insulated electric wire for a high frequency coil) was manufactured.

-Comparative Examples (Comparative Examples 1 to 8) -The iron layer, the nickel layer thickness and the number of layers, and the heat treatment time according to the method of Example 1 and under the conditions shown in Table 2 in detail, A polyurethane coating was applied and baked on the outer periphery of the alternating electrodeposition film obtained by adjusting the temperature to form a polyurethane film having a thickness of 5 μm, and a polyurethane copper wire was manufactured. In Comparative Example 8, a polyurethane film is provided only on the copper wire.

—Coil Winding and High Frequency Characteristic Test— Polyurethane copper wires (insulated electric wires for coils) of Examples and Comparative Examples obtained by applying and baking various conditions shown in FIG.
A single layer was wound tightly around a plastic bobbin of m 23 times to produce air core coils (Examples 1c to 12c and Comparative Examples 1c to 8c). Next, the air-core coils of these examples and comparative examples were tested for high frequency characteristics with an impedance analyzer (made by HP), and the relationship between high frequency resistance loss and frequency in the frequency band (1 to 100 MHz) is shown in Table 3 and Q
Figure 4 shows the relationship between values and frequencies. As is clear from FIGS. 3 and 4, the air-core coil using the insulated wire for a high-frequency coil of the present invention has a low high-frequency resistance loss even in a high-frequency band exceeding 10 MHz, has a high Q value, and has excellent high-frequency characteristics. there were.

[0023]

According to the high-frequency iron electrodeposited film, the high-frequency coil insulated wire and the method for producing the same of the present invention, a high-frequency iron electrodeposited film capable of producing an iron electrodeposited film with a small high-frequency resistance loss, and It has become possible to manufacture insulated wires for high-frequency coils that can produce high-frequency coils with low high-frequency resistance loss and high Q values. Therefore, the performance of various electronic device parts can be improved, and the effect of contributing to the industry is extremely large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a high frequency iron electrodeposited film and an insulated wire for a high frequency coil according to the present invention.

FIG. 2 is a table showing iron-nickel alternating electrodeposition layer forming conditions and heat treatment conditions.

FIG. 3 is a table showing the relationship between high frequency resistance loss of an air core coil and frequency.

FIG. 4 is a chart showing the relationship between the Q value and the frequency of the air-core coil.

[Explanation of symbols]

1 Copper conductor (copper wire) 2, 4, 6 Iron electrodeposition film (iron film) 3, 5, 7 Nickel electrodeposition film (nickel film) 8 High frequency iron electrodeposition film (iron-nickel alternate electrodeposition film) 9 Polyurethane film (solderable enamel insulating resin layer) 10 Polyurethane copper wire for high frequency coil (insulated wire for high frequency coil)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01B 7/02 H01B 7/02 A 5G325 13/00 517 13/00 517 13/16 13/16 B H01F 27 / 00 H01F 27/28 L 27/28 15/00 AF term (reference) 4K024 AA03 AA04 AB04 BA09 BC03 CA01 CA03 CB06 CB07 DA03 DA04 DB01 4K044 AA06 AB04 BA06 BA21 BB06 BC14 CA04 CA18 CA53 CA62 5E043 AA01 AB01 CA02 5E070 AB CA03 5G309 CA06 LA04 LA06 MA08 5G325 KA01 KC01 KC05

Claims (8)

[Claims] 1. A high-frequency iron electrodeposition film in which iron and nickel are alternately deposited on the outer periphery of a copper conductor to form an iron-nickel alternate electrodeposition layer, wherein the iron-nickel alternate electrodeposition layer is formed. , 6 layers or more 12
An iron electrodeposited film for high frequencies, which is composed of layers and below. 2. The iron film thickness X (μ
m) is 0.02 ≦ X ≦ 0.05, nickel film thickness y (μ
2. The high frequency iron electrodeposited film according to claim 1, wherein m) is composed of 0.01 ≦ y ≦ 0.03. 3. The high frequency iron electrodeposited film according to claim 1, wherein the high frequency iron electrodeposited film is heat-treated at a temperature of 300 ° C. to 800 ° C. to relieve the electrodeposition stress. film. 4. An insulated wire for a high frequency coil, comprising an enamel insulating resin layer having solderability provided on the outer periphery of the high frequency iron electrodeposited film according to any one of claims 1 to 3. 5. The method for producing a high frequency iron electrodeposited film according to claim 1, wherein iron and nickel are alternately electrodeposited on the outer periphery of the copper conductor by electroplating to form an iron-nickel alternate electrodeposition layer. A method for producing a high frequency iron electrodeposited film, characterized in that the number of layers is 12 or more and 12 or less. 6. The method for producing a high frequency iron electrodeposited film according to claim 2, wherein the iron film thickness X (μm) of the iron-nickel alternating electrodeposition layer is 0.02 ≦ X ≦ 0 by electroplating. .05, and a nickel film thickness y (μm) of 0.01 ≦ y ≦ 0.03 is provided. 7. The method for producing a high frequency iron electrodeposited film according to claim 3, wherein the high frequency iron electrodeposited film is heat-treated at a temperature of 300 ° C. to 800 ° C. in a non-oxidizing gas atmosphere, A method for producing a high-frequency iron electrodeposited film, characterized by relaxing electrodeposition stress. 8. A method for producing an insulated wire for a high frequency coil according to claim 4, wherein the high frequency iron electrode is obtained by the method for producing a high frequency iron electrodeposited film according to any one of claims 5 to 7. Enamel paint having solderability is applied to the outer periphery of the deposited film and baked to form a solderable enamel insulating resin layer,
A method for producing an insulated wire for a high frequency coil, which is an insulated wire for a high frequency coil.