JPH0812825B2 - Thin plate material for laminated magnetic core and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated magnetic core thin plate material used for manufacturing a laminated magnetic core used for a core of a magnetic head, a transformer, and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, laminated magnetic cores used for cores of magnetic heads and transformers are manufactured by the following steps. Thin steel plates (thin plates made of permalloy, silicon steel plate, etc.) for laminated magnetic cores having a thickness of about 0.02 to 0.1 mm are punched one by one into a core chip, and then the core chip is magnetically annealed. A plurality of core chips that have been magnetically annealed are stacked with an organic adhesive sandwiched therebetween, and are bonded to each other.

However, in the above-mentioned manufacturing method, the core chips are often distorted in the stacking step after magnetic annealing, and the yield is remarkably reduced. Further, since the stacking work of such core chips is inefficient, the productivity of the magnetic head and the like is extremely low.

In order to solve such a problem, the following proposals have already been made in JP-A-2-2602, JP-A-2-43703 and JP-A-2-43704. (1) The technology disclosed in Japanese Patent Laid-Open No. 2602/1990. An oxide film is formed on the surface of a thin steel plate (thin plate made of permalloy, silicon steel plate, etc.) for a laminated magnetic core, and then the thin steel plate having the oxide film formed is laminated by sandwiching an adhesive made of sodium silicate, and then laminated. After punching into core chips, magnetic annealing is performed (hereinafter referred to as "prior art 1"). (2) The technique disclosed in Japanese Patent Laid-Open No. 43703/1990. Thin steel sheets for laminated magnetic cores (thin sheets made of permalloy, silicon steel sheet, etc.) are laminated by sandwiching an organic adhesive for metal adhesion containing a metal or alloy powder having a melting point higher than the magnetic annealing temperature, and then press punching. After that, apply magnetic annealing
(Hereinafter, referred to as "Prior Art 2".) (3) The technology disclosed in Japanese Patent Application Laid-Open No. 2-43704. A thin steel plate for a laminated magnetic core (permalloy,
The surface roughness of a thin plate made of silicon steel plate, etc. is 1 μm ≤ Rma
With x ≤ 5 μm, the thin steel sheets are laminated with an organic adhesive for metal adhesion sandwiched between them, and then press punching is performed, followed by magnetic annealing (hereinafter referred to as “prior art 3”).

[0005]

However, the above-mentioned prior art has the following problems. In the prior art 1 described in (1), there is a problem in productivity. It is already disclosed in JP-A-2-43703 and JP-A-2-43703.
It is reported in Japanese Patent No. 43704.

In the prior arts 2 and 3 described in (2) and (3), since the organic adhesive for metal adhesion is used, the magnetic annealing reduces the adhesive strength.
Further, when thin steel plates (permalloy plates) for laminated magnetic cores are joined by an organic adhesive for metal adhesion mixed with metal powder, the insulating property cannot be maintained and the magnetic properties deteriorate.

Therefore, an object of the present invention is that a plurality of laminated thin steel sheets for magnetic cores have a stronger adhesive force than before and do not peel off even after electrical discharge machining or press punching. Another object of the present invention is to provide a laminated magnetic core thin plate material and a method for manufacturing the laminated magnetic core material, which can provide a laminated magnetic core whose complete insulation is ensured.

[0008]

The present invention has been made to achieve the above object. A first laminated magnetic core thin plate material of the present invention has a thickness of 0.1 μ on at least one surface.
A plurality of thin steel sheets for laminated magnetic cores, each having a ceramics insulating layer with a thickness of m or more and a metal adhesive layer with a thickness of 0.1 μm or more on the surface of the ceramic insulating layer, It is characterized in that the layers are laminated with the layers sandwiched therebetween, and they are thermocompression bonded to each other.

According to a first method for manufacturing a laminated magnetic core thin plate material of the present invention, a ceramic insulating layer having a thickness of 0.1 μm or more is formed on at least one surface of a laminated magnetic core thin steel plate, and then, 0.1 μ on the surface of the ceramic insulating layer
A metal adhesive layer having a thickness of m or more is formed, and then the ceramic insulating layer and the metal adhesive layer are sandwiched between the plurality of thin steel plates on which the ceramic insulating layer and the metal adhesive layer are formed. Laminated at 600 ℃
It is characterized in that the plurality of thin steel plates are thermocompression bonded to each other by performing hot press reduction under a temperature condition of 1200 ° C. or less.

Further, the second laminated magnetic core thin plate material of the present invention has a ceramic insulating layer having a thickness of 0.1 μm or more on one surface, and a ceramic insulating layer having a thickness of 0.1 μm or more on the other surface. It is characterized in that a plurality of thin steel sheets for a laminated magnetic core having a metal adhesive layer are laminated with the ceramic insulating layer and the metal adhesive layer sandwiched therebetween, and they are thermocompression-bonded to each other.

A second method of manufacturing a laminated magnetic core thin plate material of the present invention is characterized in that 0.1 μ is formed on one surface of a laminated magnetic core thin steel plate.
forming a ceramic insulating layer having a thickness of m or more, and
A metal adhesive layer having a thickness of 0.1 μm or more is formed on the other surface of the thin steel plate, and then the plurality of thin steel plates on which the ceramic insulating layer and the metal adhesive layer are formed are It is characterized in that the ceramics insulating layer and the metal adhesive layer are sandwiched and laminated, and then hot press reduction is performed under a temperature condition of 600 ° C. or higher and 1200 ° C. or lower, so that the plurality of thin steel plates are thermocompression bonded to each other. It is a thing.

The thin plate material for laminated magnetic core of the present invention is punched by a press to obtain a block body having a predetermined shape. Further, magnetic annealing is performed before or after punching by the above-mentioned press, or before and after punching, and thus a laminated magnetic core is manufactured.

Next, the present invention will be described in detail. In the first thin plate material for laminated magnetic core of the present invention and the method for manufacturing the same, a ceramic insulating layer is formed on at least one surface of a thin steel sheet for laminated magnetic core, and a metal adhesive layer is further formed on the surface of the ceramic insulating layer. Form.

The ceramic insulating layer is formed in order to obtain good insulating properties. ZrO ₂ , MgO, and Al ₂ O, which have low thermal diffusion, are used as materials for forming the ceramic insulating layer.
_{Use 3} or SiO ₂ . The thickness of the ceramic insulation layer should be at least 0.1 μm. This is to obtain good insulation.

The metal adhesive layer has a function of adhering the thin steel plate and the ceramic insulating layer or the ceramic insulating layers to each other. As the material for forming the metal adhesion layer, Ti, Cr,
Ni or Ni-Fe alloy is used. The thickness of the metal adhesion layer is
It should be 0.1 μm or more. This is because a uniform coating state is formed on the surface of the ceramic insulating layer or the thin steel plate to obtain good adhesiveness.

In the second thin plate material for laminated magnetic core and the method for manufacturing the same according to the present invention, a ceramic insulating layer is formed on one surface of a thin steel sheet for laminated magnetic core, and metal bonding is performed on the other surface of the thin steel sheet. Form the layers. As the ceramic insulating layer, similar to the first laminated magnetic core thin plate material of the present invention and the method for manufacturing the same, ZrO ₂ , MgO ₂ , Al ₂ O ₃ or SiO _{2 is used.
2} as the metal adhesion layer, Ti, Cr, Ni or Ni
-Use Fe alloy.

Next, as a means for forming the ceramics insulating layer and the metal adhesive layer on the surface of the thin steel plate or the ceramics insulating layer, a coating method by a dry plating method is used. The reason _{is, ZrO 2, MgO, Al 2} O 3, ceramics such as SiO _2, Ti, Cr, a metal such as Ni or Ni-
This is because it is difficult to use the wet plating method for alloys such as Fe. By using the dry plating method, it is possible to uniformly coat the surface of the thin steel plate or the ceramic insulating layer with good adhesion.

Further, by using the dry plating method, the ceramic insulating layer and the metal adhesion are provided on the surface of the thin steel sheet for laminated magnetic core as in the first thin laminated sheet material for laminated magnetic core and the manufacturing method thereof according to the present invention. A multilayer film composed of layers can be formed. Here, the dry plating method in the present invention means any one of an ion plating method, a vacuum deposition method and a sputtering method. From the viewpoint of productivity and adhesion, it is desirable to use an appropriate method from these.

As a material for the thin steel plate for the laminated magnetic core, permalloy or a silicon steel plate which has been conventionally used as a magnetic core material can be used.

Next, the reduction by the hot pressing method will be described. A predetermined number of thin steel sheets for a laminated magnetic core, on which a ceramics insulating layer and a metal adhesive layer are formed, are laminated with the ceramics insulating layer and the metal adhesive layer sandwiched between them, and then loaded into a hot press jig at a predetermined heating temperature and a predetermined temperature. In the above atmosphere, the laminated thin steel plates are pressed from above and below with a predetermined pressure by the jig.

The heating temperature is 600 ° C. or higher and 1200 ° C. or lower.
The heating temperature is limited to 600 ° C. or higher in order to prevent distortion that occurs during press punching and peeling of laminated thin steel sheets. That is, at a heating temperature of less than 600 ° C., when a laminated magnetic core of the present invention is further punched or electric discharge machined to form a laminated magnetic core, distortion occurs during press working, and further, laminated thin steel sheets. This is because peeling may occur. However, this can be said when processing by press punching which is currently used in actual production, and if strain-free processing is used as the processing means, the heating temperature is 600 ° C.
The above problem does not occur even at a predetermined temperature of less than. However, at the current technology level of strain-free processing, there is a problem in productivity, so it cannot be adopted eventually, so the heating temperature is set to 600 ° C or higher. On the other hand, even when the heating temperature under the hot press pressure is higher than 1200 ° C., the above effect is saturated. Therefore, the heating temperature should be above 600 ℃ and below 1200 ℃.

During the thermocompression bonding by the hot press reduction, in the first laminated magnetic core thin plate material and the method for manufacturing the same according to the present invention, the metal adhesive layer and the thin steel plate (made of permalloy or silicon steel plate) are solid-phase diffusion bonded. To do.

On the other hand, in the first and second laminated magnetic core thin plate materials and the method for manufacturing the same according to the present invention, the ceramic insulating layer and the metal adhesive layer are adhered to each other. Although the details of the bonding mechanism between the ceramic insulating layer and the metal bonding layer are unknown, it is considered that they are chemically bonded to each other to enable bonding. Therefore, for the adhesion of laminated steel sheets,
Unlike the prior arts 1 to 3, it is not necessary to use an adhesive such as an organic adhesive for metal adhesion, and distortion caused by uneven thickness of the adhesive is prevented. Furthermore, since the ceramics insulating layer uniformly covers the entire surface of the thin steel sheet, the problem of insulation failure does not occur.

Annealing of thin steel sheets for laminated magnetic cores
This is to ensure the minimum magnetic characteristics required for the laminated magnetic core. The annealing may be performed in vacuum or in a gas atmosphere such as argon or hydrogen, but the annealing temperature range is 95
The temperature is preferably 0 ° C or higher and 1200 ° C or lower. The annealing temperature is
Below 950 ℃, improvement in magnetic properties cannot be expected, and 1200 ℃
If it exceeds, thermal deformation occurs in the laminated steel sheet for magnetic core. Also,
The thin steel sheet for laminated magnetic core may be annealed in advance, may be annealed after block working for a laminated magnetic core, or may be annealed for thin laminated steel sheet for a laminated magnetic core and then annealed again after block working. However, if the thin steel sheets for laminated magnetic cores are annealed in advance, the cooling rate after annealing is reduced, and the magnetic properties tend to be improved.

[0025]

Embodiments of the present invention will now be described with reference to the drawings. [Example 1] An example of the first laminated magnetic core thin plate material of the present invention and a method for manufacturing the same will be described below. 1A to 1C are schematic explanatory views showing Embodiment 1 of the present invention. The drawing shows an example in which five thin steel plates are laminated. As shown in Table 1, as a thin steel plate for a laminated magnetic core to be used as a thin plate material for a laminated magnetic core, 0.1 to 0.5 m
PC permalloy plate (81.5 wt.% Ni-5.5 wt.% Mo-
Fe), high hardness permalloy plate (79wt.% Ni-6wt.% Nb-Fe)
And a silicon steel plate (Fe-6.5 wt.% Si) were used.

First, the thin steel sheet was magnetically annealed in hydrogen or vacuum at 800 to 1250 ° C. for 30 minutes to 4 hours. Next, as shown in FIG. 1A, a ceramic insulating layer having a thickness of 0.1 to 3 μm was coated on one surface of this thin steel plate by an ion plating method or a vacuum deposition method. Then, a metal adhesive layer having a thickness of 0.1 to 5 μm was coated on the surface of the ceramic insulating layer by an ion plating method or a vacuum deposition method.

Then, as shown in FIG. 1B, a predetermined number of thin steel sheets having the ceramics insulating layer and the metal adhesive layer formed on one surface thereof are laminated with the ceramics insulating layer and the metal adhesive layer sandwiched therebetween, Then, it was loaded in a hot press jig and subjected to hot press reduction by pressing at a predetermined pressure from above and below under the hot press conditions shown in Table 1 to prepare a laminated magnetic core thin plate material as shown in FIG. 1C. . In the table, "Ar 1atm" means Ar
Blow 1 atm of gas, "H ₂ 1 atm" means H ₂ gas
Blowing 1 atm, "vacuum" means 1 x 10 ^-5 to 1 x 10
^-4 Torr is shown respectively.

The thin plate material for laminated magnetic cores thus prepared was punched by pressing or electric discharge machining to obtain a block body having a predetermined shape. Then, the peel resistance and magnetic properties of the specimens No. 1 to No. 18 treated in this way were examined by the test methods shown below, and the results are also shown in Table 1.

Peeling resistance test: The state of peeling of each of the specimens was examined. The evaluation of peeling resistance is as follows. ○: No peeling △: Partial peeling occurred ×: Whole surface peeling occurred

Magnetic property test: Each of the test pieces was incorporated into a magnetic head to evaluate the magnetic property. The evaluation method is as follows.
.About.35 KΩ (80 kHz)). ◯: Impedance equal to or higher than the impedance (impedance; 28 to 35 KΩ (80 KHz)) of the laminated magnetic core shown in the related arts 1 to 3 ×: Impedance of the laminated magnetic core shown in the related arts 1 to 3 (impedance; 28 to 35 KΩ) (80KHz)) Impedance lower than-: Cannot be measured

[0031]

[Table 1]

As is clear from Table 1, a comparative example in which the temperature under the hot press is 400 ° C. or 500 ° C. (specimen No.
In No. 15, No. 17), peeling was observed and the magnetic performance could not be evaluated. In addition, the magnetic properties were deteriorated when the layers were laminated under the conditions that the annealing temperature was 800 ° C and the temperature under hot pressing was 1100 ° C (Sample No. 16). The annealing temperature is
In the specimen No. 18 at 1250 ° C, the steel plate was thermally deformed and the magnetic properties could not be measured. On the other hand, peeling did not occur in the examples (samples No. 1 to No. 14) in which the temperature under the hot pressing was 600 ° C. or higher. Furthermore, in the examples, as compared with the laminated magnetic cores shown in the related arts 1 to 3, good magnetic characteristics equivalent to or better than the magnetic cores were shown.

Example 2 FIGS. 2A to 2C are schematic explanatory views showing Example 2 of the first laminated magnetic core thin plate material of the invention and the manufacturing method thereof. The drawing shows an example in which four thin steel plates are laminated. 900-12 in this hydrogen or vacuum in the same manner as in Example 1 except that a ceramic insulating layer and a metal adhesive layer were formed on both surfaces of the thin steel sheet as shown in FIG. 2A.
As shown in FIG. 2B, a predetermined number of thin steel sheets that have been magnetically annealed at 50 ° C. for 30 minutes to 4 hours are laminated with a ceramic insulating layer and a metal adhesive layer interposed therebetween, and hot-pressed under the hot press conditions shown in Table 2. Pressing was performed to prepare the laminated magnetic core thin plate material shown in FIG. 2C. The thin plate material for laminated magnetic core thus prepared was punched by pressing or electric discharge machining in the same manner as in Example 1 to obtain a block body having a predetermined shape. Then, the peel resistance and magnetic properties of the specimens No. 19 to No. 33 thus treated were examined by the same test method as in Example 1, and the results are also shown in Table 2.

[0034]

[Table 2]

As is clear from Table 2, a comparative example in which the temperature under hot pressing is 400 ° C. or 500 ° C. (specimen No.
In No. 30, No. 32), peeling was observed and the magnetic performance could not be evaluated. Moreover, although the layers were laminated under the conditions that the annealing temperature was 900 ° C and the temperature under hot pressing was 1050 ° C, the magnetic properties deteriorated (specimen No. 31). The annealing temperature is
In the sample No. 33 at 1250 ° C, the steel plate was thermally deformed, and the magnetic properties could not be measured. On the other hand, peeling did not occur in the examples (samples No. 19 to No. 29) in which the temperature under the hot press pressure was 600 ° C. or higher. Furthermore, in the examples, as compared with the laminated magnetic cores shown in the related arts 1 to 3, good magnetic characteristics equivalent to or better than the magnetic cores were shown.

[Embodiment 3] An embodiment of the second laminated magnetic core thin plate material of the present invention and its manufacturing method will be described below. 3A to 3C are schematic explanatory views showing a third embodiment of the present invention. The drawing shows an example in which ten thin steel plates are laminated. As shown in Table 3, as a thin steel plate, a PC permalloy plate (81.5 wt.% Ni with a thickness of 0.1 to 0.5 mm) is used.
-5.5 wt.% Mo-Fe) and high hardness permalloy plate (79 wt.%
Ni-6 wt.% Nb-Fe) was used.

As shown in FIG. 3A, the thin steel sheet was magnetically annealed in hydrogen or vacuum at 800 to 1250 ° C. for 30 minutes to 4 hours. Then, on one surface of the steel sheet,
A ceramic insulating layer having a thickness of 0.1 to 3 μm was coated by an ion plating method or a vacuum deposition method. Further, the other surface of the thin steel plate was coated with a metal adhesion layer having a thickness of 0.1 to 3 μm by an ion plating method or a vacuum deposition method. Then, as shown in FIG. 3B, a predetermined number of thin steel plates on which the ceramics insulating layer and the metal adhesive layer are formed are stacked with the ceramics insulating layer and the metal adhesive layer sandwiched therebetween, and then loaded into a hot press jig. Then, hot pressing was performed by pressing at a predetermined pressure from above and below under the hot pressing conditions shown in Table 3 to prepare the thin plate material for laminated magnetic core shown in FIG. 3C.

The thin plate material for laminated magnetic core thus prepared was punched by pressing or electric discharge machining in the same manner as in Example 1 to obtain a block body having a predetermined shape. Then, the peel resistance and magnetic properties of the specimens No. 34 to No. 48 thus treated were examined by the same test method and evaluation method as in Example 1, and the results are also shown in Table 3.

[0039]

[Table 3]

As is clear from Table 3, in the comparative examples (specimen No44, No46, No48) in which the temperature under hot pressing is 400 ° C., 450 ° C. or 500 ° C., delamination was observed and magnetic performance was evaluated. I couldn't. Moreover, although the layers were laminated under the conditions that the annealing temperature was 800 ° C and the temperature under hot pressing was 1100 ° C, the magnetic properties deteriorated (No 45).
In the sample No. 47 whose annealing temperature was 1250 ° C, the steel plate was thermally deformed and the magnetic properties could not be measured. On the other hand, an example in which the temperature under hot pressing is 800 ° C or higher (sample No. 34-
In No. 43), peeling did not occur. Furthermore, in the examples, as compared with the laminated magnetic cores shown in the related arts 1 to 3, good magnetic characteristics equal to or higher than the same were exhibited.

[Embodiment 4] An embodiment of the first thin plate material for laminated magnetic core and the manufacturing method thereof according to the present invention will be described below. 1A to 1C are schematic explanatory views showing a fourth embodiment of the present invention. The drawing shows an example in which five thin steel plates are laminated. As shown in Table 4, as a thin steel plate for a laminated magnetic core to be used for a laminated thin plate material for a laminated magnetic core, 0.1 to 0.5 m
PC permalloy plate (81.5 wt.% Ni-5.5 wt.% Mo-
Fe), high hardness permalloy plate (79wt.% Ni-6wt.% Nb-Fe)
And a silicon steel plate (Fe-6.5 wt.% Si) were used.

As shown in FIG. 1A, one surface of this thin steel sheet was coated with a ceramic insulating layer having a thickness of 0.1 to 3 μm by an ion plating method or a vacuum deposition method. Then, on the surface of this ceramic insulating layer, 0.
A metal adhesion layer having a thickness of 1 to 5 μm was coated by an ion plating method or a vacuum deposition method.

Then, as shown in FIG. 1B, a predetermined number of thin steel sheets having the ceramics insulating layer and the metal adhesive layer formed on one surface thereof are laminated with the ceramics insulating layer and the metal adhesive layer interposed therebetween, as shown in FIG. 1B. Then, the laminate was loaded into a hot press jig and subjected to hot press reduction by pressing at a predetermined pressure from above and below under the hot press conditions shown in Table 4 to prepare a laminated magnetic core thin plate material as shown in FIG. 1C. .

The thin plate material for laminated magnetic core thus prepared was punched by pressing or electric discharge machining in the same manner as in Example 1 to obtain a block body having a predetermined shape, and then the formed block body was hydrogen or vacuum. 950-1200 ℃
The magnetic annealing was performed for 30 minutes to 4 hours. Then, the peel resistance and the magnetic properties of the specimens No49 to No70 thus treated were examined by the same test method as in Example 1, and the results are also shown in Table 4.

[0045]

[Table 4]

As is apparent from Table 4, in Comparative Examples (Samples No. 68 to No. 70) in which the temperature under the hot press is 400 ° C., 500 ° C. or 550 ° C., peeling was observed and the magnetic performance could be evaluated. could not. On the other hand, peeling did not occur in the examples (specimen No. 49 to No. 67) in which the temperature under hot pressing was 600 ° C. or higher. Furthermore, in the examples, as compared with the laminated magnetic cores shown in the related arts 1 to 3, good magnetic characteristics equivalent to or better than the magnetic cores were shown.

[Embodiment 5] FIGS. 2A to 2C are schematic explanatory views showing Embodiment 5 of a first laminated magnetic core thin plate material and a manufacturing method thereof according to the present invention. The drawing shows an example in which four thin steel plates are laminated. This thin steel sheet was subjected to ceramic insulation as shown in FIG. 2B by the same method as in Example 4 except that a ceramics insulating layer and a metal adhesion layer were formed on both surfaces of the thin steel sheet as shown in FIG. 2A. A predetermined number of layers were sandwiched between the layers and the metal adhesive layer, and hot pressing was performed under the hot pressing conditions shown in Table 5 to prepare the laminated magnetic core thin plate material shown in FIG. 2C. The thin plate material for laminated magnetic core prepared in this manner is
A block body having a predetermined shape is punched by pressing or electric discharge machining in the same manner as in Example 4, and then the formed block body is subjected to hydrogen or vacuum at 950 to 1200 ° C. for 30 minutes or more.
Magnetic annealing was carried out for 4 hours. Then, the peel resistance and magnetic properties of the specimens No71 to No84 thus treated were examined by the same test method as in Example 1, and the results are also shown in Table 5.

[0048]

[Table 5]

As is clear from Table 5, in Comparative Examples (specimen No. 81 to No. 84) in which the temperature under hot pressing was 400 ° C., 500 ° C. or 550 ° C., peeling was observed and the magnetic performance could be evaluated. could not. On the other hand, in the examples (samples No71 to No80) in which the temperature under hot pressing was 650 ° C or higher, peeling did not occur. Furthermore, in the examples, as compared with the laminated magnetic cores shown in the related arts 1 to 3, good magnetic characteristics equivalent to or better than the magnetic cores were shown.

[Embodiment 6] An embodiment of the second laminated magnetic core thin plate material of the present invention and the method for producing the same will be described below. 3A to 3C are schematic explanatory views showing Embodiment 6 of the present invention. The drawing shows an example in which ten thin steel plates are laminated. As shown in Table 6, as a thin steel plate, a PC permalloy plate (81.5 wt.% Ni with a thickness of 0.1 to 0.5 mm) is used.
-5.5 wt.% Mo-Fe) and high hardness permalloy plate (79 wt.%
Ni-6 wt.% Nb-Fe) was used.

As shown in FIG. 3A, a ceramic insulating layer having a thickness of 0.1 to 3 μm was coated on one surface of this thin steel plate by an ion plating method or a vacuum deposition method. Furthermore, on the other surface of the thin steel sheet, 0.1 to 3 μm
A metal adhesion layer having a thickness of 1 was coated by an ion plating method or a vacuum deposition method. Then, as shown in FIG. 3B, a predetermined number of thin steel plates on which the ceramics insulating layer and the metal adhesive layer are formed are stacked with the ceramics insulating layer and the metal adhesive layer sandwiched therebetween, and then loaded into a hot press jig. Then, hot pressing was performed by pressing at a predetermined pressure from above and below under the hot pressing conditions shown in Table 6 to prepare the laminated magnetic core thin plate material shown in FIG. 3C.

The thin plate material for laminated magnetic cores thus prepared was punched by a press in the same manner as in Example 4 to form a block body having a predetermined shape, and then the formed block body was subjected to 950 in hydrogen or vacuum. Magnetic annealing was carried out by maintaining the temperature at ˜1150 ° C. for 1 to 4 hours. Then, the peel resistance and magnetic properties of the specimens No85 to No103 thus treated were examined by the same test method and evaluation method as in Example 1, and the results are also shown in Table 6.

[0053]

[Table 6]

As is clear from Table 6, the comparative example in which the temperature under the hot pressing is 300 ° C. or 500 ° C. (specimen No.
In Nos. 101 to 103), peeling was observed and magnetic performance could not be evaluated. On the other hand, an example in which the temperature under the hot press pressure was 600 ° C or higher (sample No85
No peeling did not occur. Furthermore, in the examples, as compared with the laminated magnetic cores shown in the related arts 1 to 3, good magnetic characteristics equivalent to or better than the magnetic cores were shown.

[0055]

As described above, according to the present invention, since a plurality of laminated thin steel sheets for laminated magnetic cores are firmly adhered by the metal adhesive layer, peeling occurs even after punching by pressing or electric discharge machining. In addition, since the ceramics insulating layer uniformly covers the entire surface of the thin steel sheet, there is no insulation mistake and complete insulation is secured. Therefore, by providing the laminated magnetic core thin plate material of the present invention for manufacturing the laminated magnetic core, an industrially useful effect that a laminated magnetic core having excellent magnetic characteristics can be obtained is brought about.

[Brief description of drawings]

FIG. 1A is a schematic explanatory view showing Embodiments 1 and 4 of the present invention.

FIG. 1B is a schematic explanatory view showing Embodiments 1 and 4 of the present invention.

FIG. 1C is a schematic explanatory view showing Embodiments 1 and 4 of the present invention.

FIG. 2A is a schematic explanatory view showing Embodiments 2 and 5 of the present invention.

FIG. 2B is a schematic explanatory view showing Embodiments 2 and 5 of the present invention.

FIG. 2C is a schematic explanatory view showing Embodiments 2 and 5 of the present invention.

FIG. 3A is a schematic explanatory view showing Embodiments 3 and 6 of the present invention.

FIG. 3B is a schematic explanatory view showing Embodiments 3 and 6 of the present invention.

FIG. 3C is a schematic explanatory view showing Embodiments 3 and 6 of the present invention.

[Explanation of symbols]

 1 Thin plate material for laminated magnetic core 2 Ceramics insulating layer 3 Metal adhesive layer 4 Thin steel plate 5 Hot press jig.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H01F 41/02 BJ H01F 1/18 (56) References JP-A-53-58216 (JP, A) ) JP-A 61-239607 (JP, A) JP-A 57-95608 (JP, A) JP-A 2-143507 (JP, A) JP-A 2-43703 (JP, A) JP-A 1- 130505 (JP, A)

Claims (4)

[Claims] 1. A plurality of laminated magnetic cores having a ceramic insulating layer having a thickness of 0.1 μm or more on at least one surface and a metal adhesive layer having a thickness of 0.1 μm or more on the surface of the ceramic insulating layer. A thin sheet material for a laminated magnetic core, characterized in that: thin steel sheets for use in a laminated magnetic core are laminated by sandwiching the ceramic insulating layer and the metal adhesive layer, and are thermocompression-bonded to each other. 2. A ceramic insulating layer having a thickness of 0.1 μm or more is formed on at least one surface of a thin steel plate for a laminated magnetic core, and then a ceramic insulating layer having a thickness of 0.1 μm is formed on the surface of the ceramic insulating layer.
A metal adhesive layer having a thickness of 1 μm or more is formed, and then the plurality of thin steel plates on which the ceramic insulating layer and the metal adhesive layer are thus formed are attached to the ceramic insulating layer and the metal adhesive layer. Sandwich and stack, then 60
A method for manufacturing a thin plate material for laminated magnetic cores, characterized in that hot-press reduction is performed under a temperature condition of 0 ° C. or higher and 1200 ° C. or lower to thermocompress the plurality of thin steel plates to each other. 3. A thin laminated magnetic core having a ceramic insulating layer with a thickness of 0.1 μm or more on one surface and a metal adhesion layer with a thickness of 0.1 μm or more on the other surface. A thin plate material for a laminated magnetic core, characterized in that steel plates are laminated with the ceramic insulating layer and the metal adhesive layer sandwiched therebetween, and are thermocompression-bonded to each other. 4. On one surface of a thin steel sheet for laminated magnetic core,
A ceramic insulating layer having a thickness of 0.1 μm or more is formed, and a metal adhesion layer having a thickness of 0.1 μm or more is formed on the other surface of the thin steel sheet, and then the ceramic insulating layer and the A plurality of the thin steel sheets on which a metal adhesive layer is formed are laminated by sandwiching the ceramic insulating layer and the metal adhesive layer, and then subjected to hot press reduction under a temperature condition of 600 ° C or higher and 1200 ° C or lower, A method of manufacturing a thin plate material for a laminated magnetic core, characterized in that the plurality of thin steel plates are thermocompression bonded to each other.