KR20220086059A - Electrical steel steet adhesive composition, electrical steel steet laminate and manufacturing method for the same - Google Patents

Abstract

In the electrical steel sheet laminate according to an embodiment of the present invention, two or more electrical steel sheets are laminated, an adhesive layer is interposed between the electrical steel sheets, and the adhesive layer includes sucrose.

Description

Electrical steel sheet adhesive composition, electrical steel sheet laminate, and manufacturing method thereof

An embodiment of the present invention relates to an electrical steel sheet adhesive composition, an electrical steel sheet laminate, and a method for manufacturing the same. More specifically, it relates to a method of manufacturing an electrical steel sheet laminate for improving high-frequency iron loss by reducing the thickness of the electrical steel sheet.

In general, non-oriented electrical steel sheet is an important iron core material required to convert electrical energy into mechanical energy in rotating equipment. Here, since iron loss is energy that is converted into heat and disappears during the energy conversion process, the lower it is, the more efficient it is.

Recently, as a measure to reduce the shortage of fossil fuels and greenhouse gas, the technology for converting existing internal combustion engine vehicles to HEV (hybrid vehicle) / EV (electric vehicle) is rapidly developing. These HEVs/EVs are automobiles that convert some or all of the driving method to an electric motor to reduce the consumption of gasoline or diesel fuel, which is the existing internal combustion engine fuel, while providing better fuel efficiency.

The motor used in such a vehicle rotates at high speed during high-speed driving. Therefore, the non-oriented electrical steel sheet, which is the core material of the motor, should have low high-frequency iron loss during high-speed rotation. In general, high-frequency iron loss means iron loss at a frequency of 200 Hz or higher, but a value of W _10/400 is mainly used in non-oriented electrical steel sheets for automobiles.

Also, in the field of home appliances, iron loss in this high-frequency core loss region is increasingly important due to the adoption of BLDC motors. In order to improve the high-frequency iron loss, alloy elements such as Si, Al, Mn, which are resistive elements of the electrical steel sheet, should be increased, impurities should be reduced to facilitate movement of magnetic domains, and the thickness of the electrical steel sheet should be made thin.

However, when non-magnetic alloying elements such as Si, Al, and Mn are high, rolling is difficult and there is a limit, and when the thickness is reduced, there is a difficulty in that the production cost and the processing cost in terms of the customer are increased.

In order to solve this problem, a so-called sandwich steel sheet in which an adhesive layer is interposed between electrical steel sheets and additionally rolled is proposed. However, existing organic materials have been proposed as adhesive layers, and they are expensive (300$/ton) and have the disadvantage of having to be processed at a high temperature of 1000°C or higher. In addition, the existing inorganic material has a disadvantage in that it is impossible to wind it due to low elasticity and increased brittleness of the bonding material during winding.

An embodiment of the present invention is to provide an electrical steel sheet adhesive composition, an electrical steel sheet laminate, and a method for manufacturing the same. More specifically, an object of the present invention is to provide a method of manufacturing an electrical steel sheet laminate that improves high-frequency iron loss by providing a sandwich electrical steel sheet having an insulating layer added therein.

The electrical steel sheet adhesive composition of one embodiment of the present disclosure may include sucrose.

The electrical steel sheet adhesive composition may further include a metal oxide.

The metal oxide may be at least one selected from the group consisting of CaO, SiO ₂ , Al ₂ O ₃ , AlN, BN, MgO and ZrO ₂ .

The sucrose: metal oxide may be mixed in a weight ratio of 1:1 to 1:4.

In the electrical steel sheet laminate of an embodiment of the present disclosure, two or more electrical steel sheets are laminated, an adhesive layer is interposed between the electrical steel sheets, and the adhesive layer may include a metal saccharide represented by Chemical Formula 1 below.

[Formula 1]

The metal ion of the metal saccharide salt may be a calcium ion (Ca ²⁺ ).

The adhesive layer may have a thickness of 0.3 μm or more.

The electrical steel sheet laminate may further include an insulating film positioned on the surface of the electrical steel sheet present in the outermost.

The electrical steel sheet is in weight %, Si: 3.5% or less (however, 0% is excluded), Al: 2.5% or less (however, 0% is excluded), Mn: 3% or less (however, 0% is excluded), P: 0.1% or less (however, 0% is excluded), C: 0.04% or less (however, 0% is excluded), S: 0.01% or less (however, 0% is excluded), N: 0.01% or less (however, 0%) and the remainder Fe and other unavoidable impurities.

The manufacturing method of the electrical steel sheet laminate of one embodiment of the present disclosure includes the steps of: preparing a hot-rolled sheet by hot rolling a slab; manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet; stacking the cold-rolled sheets by inserting an adhesive composition in the middle of each layer; manufacturing a multi-layer cold-rolled sheet by light-rolling the laminated cold-rolled sheet; and final annealing the multilayer cold-rolled sheet, wherein the adhesive composition may further include sucrose.

The adhesive composition may further include a metal oxide.

In the light rolling step, the reduction ratio may be 10 to 20%.

The step of laminating by inserting an adhesive composition in the middle of each layer; may be a step of applying a metal oxide to one surface of one cold-rolled sheet, applying sucrose to one surface of the other cold-rolled sheet, and laminating the coated surfaces together. .

The slab is weight %, Si: 3.5% or less (however, 0% is excluded), Al: 2.5% or less (however, 0% is excluded), Mn: 3% or less (however, 0% is excluded), P : 0.1% or less (except 0%), C: 0.04% or less (however, excluding 0%), S: 0.01% or less (however, excluding 0%), N: 0.01% or less (however, 0%) %) and the remainder Fe and other unavoidable impurities.

By manufacturing an electrical steel sheet laminate according to an embodiment of the present invention, an increase in production cost due to thinning can be suppressed by inserting an insulating layer between the final electrical steel sheet layers.

When making an electrical steel sheet laminate in a laminated structure according to an embodiment of the present invention, customer processing can be facilitated.

The electrical steel sheet laminate according to an embodiment of the present invention may have excellent high-frequency iron loss.

1 is a schematic diagram of a cross-section of an electrical steel sheet laminate according to an embodiment of the present invention.
2 is a schematic diagram of a manufacturing process of an electrical steel sheet laminate according to an embodiment of the present invention.
3 is a schematic diagram of a manufacturing flow of an electrical steel sheet laminate according to an embodiment of the present invention.

In this specification, terms such as first, second and third are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.

In the present specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

In this specification, the terminology used is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and includes the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions.

In this specification, the term "combination of these" included in the expression of the Markush form means one or more mixtures or combinations selected from the group consisting of the components described in the expression of the Markush form, and the components It means to include one or more selected from the group consisting of.

In the present specification, when a part is referred to as being “on” or “on” another part, it may be directly on or on the other part, or the other part may be accompanied therebetween. In contrast, when a part is referred to as being "directly above" another part, the other part is not interposed therebetween.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Commonly used terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and unless defined, are not interpreted in an ideal or very formal meaning.

In addition, unless otherwise specified, % means weight %, and 1 ppm is 0.0001 weight %.

In an embodiment of the present invention, the meaning of further including the additional element means that the remaining iron (Fe) is included by replacing the additional amount of the additional element.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be implemented in several different forms and is not limited to the embodiments described herein.

The electrical steel sheet adhesive composition of an embodiment of the present invention may contain sucrose. Sucrose is a disaccharide, and when used in an electrical steel sheet adhesive composition, caramelizes during final annealing to have viscoelasticity and maintain the bonding layer.

The adhesive composition may further include a metal oxide. Specifically, the metal oxide may be at least one selected from the group consisting of CaO, SiO ₂ , Al ₂ O ₃ , AlN, BN, MgO and ZrO ₂ . Specifically, it may be CaO, SiO ₂ or a mixture thereof.

When the metal oxide is included in the electrical steel sheet adhesive composition, it can contribute to forming a bonding layer by forming a metal saccharate together with sucrose in the process of pressing after applying the cold-rolled sheet.

In the electrical steel sheet adhesive composition, the sucrose: metal oxide may be mixed in a weight ratio of 1:1 to 1:4. When the amount of metal oxide is too small compared to that of sucrose, the amount of saccharide formed decreases, so that the adhesion performance cannot be properly obtained. On the other hand, when the metal oxide is included too much compared to sucrose, the amount of sucrose is relatively decreased, and the adhesiveness may be rather deteriorated. Specifically, sucrose: metal oxide may be included in a weight ratio of 1: 2 to 1: 4.

In addition, the electrical steel sheet adhesive composition may further include a solvent. The solvent allows the electrical steel sheet adhesive composition to be easily applied to the surface of the electrical steel sheet. The solvent may be included in the remainder except for the above-mentioned components.

Specifically, the solvent may be water or alcohol.

1 shows a cross-section of an electrical steel sheet laminate according to an embodiment of the present invention. As shown in Figure 1, in the electrical steel sheet laminate 100 according to an embodiment of the present invention, two or more electrical steel sheets 10 are laminated, an adhesive layer 20 is interposed between the electrical steel sheets 10, and an adhesive layer ( 20) may include a metal saccharide represented by Formula 1 below. 1 shows an example in which the electrical steel sheet 10 is laminated in two layers, but is not limited thereto, and may be laminated in two or more layers, or three or four layers.

[Formula 1]

Hereinafter, each configuration will be described in detail.

The electrical steel sheet 10 may be a non-oriented electrical steel sheet or a grain-oriented electrical steel sheet. More specifically, it may be a non-oriented electrical steel sheet.

An embodiment of the present invention means that the adhesive effect appears by the components of the adhesive layer and the lamination process irrespective of the alloy composition of the electrical steel sheet 10 . Hereinafter, the alloy components of the general electrical steel sheet 10 will be described as supplementary.

Electrical steel sheet 10 in weight %, Si: 3.5% or less (however, 0% is excluded), Al: 2.5% or less (however, 0% is excluded), Mn: 3% or less (however, 0% is excluded) ), P: 0.1% or less (however, 0% is excluded), C: 0.04% or less (however, 0% is excluded), S: 0.01% or less (however, 0% is excluded), N: 0.01% or less ( However, 0% is excluded) and the remainder may include Fe and other unavoidable impurities. In an embodiment of the present invention, two or more layers of electrical steel sheet 10 are present, and alloy components of each electrical steel sheet 10 may be different.

Si: 3.5 wt% or less

Silicon (Si, silicon) serves to lower the iron loss by increasing the specific resistance of the material, and if it is added too much, the hardness of the material increases and productivity and punchability may be inferior. More specifically, it may include 2.0 to 3.5 wt% of Si.

Al: 2.5 wt% or less

Aluminum (Al) increases the resistivity of the material, lowers iron loss, and suppresses the formation of fine nitrides. However, if too much is added, it may cause problems in all processes such as steelmaking, continuous casting, and hot rolling, thereby greatly reducing productivity. More specifically, it may contain 0.5 to 2.0 wt% of Al.

Mn: 3 wt% or less

Manganese (Mn) serves to improve the iron loss and form sulfide by increasing the specific resistance of the material. When added too little, MnS is finely precipitated to deteriorate magnetism, and when added too much, the magnetic flux density can be reduced. More specifically, it may contain 0.5 to 2.5 wt% of Mn.

P: 0.1% by weight or less

Phosphorus (P) is mostly dissolved in the steel and exhibits an effect of improving iron loss, but when it is included too much, it is segregated at grain boundaries to reduce the toughness of the material, so it is not preferable because it deteriorates productivity and punchability. More specifically, it may contain 0.005 to 0.05 wt% of P.

C: 0.04% by weight or less

Carbon (C) is an effective element to increase the strength, but when it is included in too much, the magnetic decrease is greater than the effect caused by the strength increase. Therefore, when iron loss is important, carbon causes self-aging, so it is necessary to control the content. More specifically, it may contain C in an amount of 0.01 wt% or less. More specifically, it may contain C in an amount of 0.005% by weight or less.

S: 0.01 wt% or less

Since sulfur (S) deteriorates magnetic properties by forming fine precipitates of MnS and CuS, it is desirable to manage it low. Since it is an element that is indispensable in steel, it is better to contain it as little as possible through the refining process in steelmaking. More specifically, S may be included in an amount of 0.005 wt% or less.

N: 0.01 wt% or less

Nitrogen (N) is preferably contained as little as possible because it forms fine and long AlN precipitates inside the base material and inhibits grain growth to inferior iron loss. More specifically, N may be included in an amount of 0.005 wt% or less.

Other unavoidable impurity elements

In addition to the above impurity elements, unavoidably mixed impurities such as Ti and Nb may be included. Ti and Nb promote the growth of the [111] grain, which is an undesirable crystal orientation in the electrical steel sheet, so be limited to 0.004 wt% or less (excluding O%), more specifically 0.002 wt% or less (excluding O%). can

In addition to the above elements, the remainder may be Fe. In one embodiment of the present invention, addition of an additional element other than the above-mentioned elements is not excluded, and when an additional element is included, it may be added instead of Fe.

Each of the electrical steel sheet 10 may have a thickness of 0.5 mm or less. In one embodiment of the present invention, even if the electrical steel sheet 10 is thinned, the overall thickness of the laminate 100 is at a level similar to that of the existing electrical steel sheet, so that the customer's processing cost is not increased. At the same time, there is an effect of improving high-frequency iron loss through thinning. More specifically, each of the electrical steel sheet 10 may have a thickness of 0.3 to 0.5 mm.

The adhesive layer 20 is interposed between the electrical steel sheets 10 to bond the electrical steel sheets to each other. In an embodiment of the present invention, the adhesive layer 20 may include a metal saccharide represented by Chemical Formula 1 below.

[Formula 1]

Metal saccharate is formed by the reaction of sucrose and metal oxide, and can be cured immediately even after being applied to a cold-rolled sheet and compressed for a short time. Specifically, the metal ion of the metal sugar salt may be a calcium ion, a silicon ion, an aluminum ion, a boron ion, or a magnesium ion. More specifically, the metal ion of the metal saccharide may be a calcium ion.

In the present disclosure, sucrose in the adhesive composition used to form the adhesive layer is cured into the adhesive layer and all can be converted into metal saccharide salts.

The adhesive layer 20 is formed by applying the aforementioned adhesive composition to the surface of the electrical steel sheet 10 and heat-treating it. Since the adhesive composition has been described above, it is omitted.

However, volatile components such as a solvent in the adhesive composition are removed by heat treatment during the manufacturing process, and the ratio of components in the adhesive layer 20 may be different from that of the adhesive composition.

The adhesive layer may have a thickness of 0.3 μm or more. If the thickness of the adhesive layer is too thin, the adhesiveness may be weakened. When the adhesive layer 20 is thickened, the adhesive strength is improved, but the space factor may be reduced. Therefore, the upper limit may be 1.0 μm. Specifically, the thickness of the adhesive layer may be 0.3 to 1.0 μm, and more specifically, the thickness of the adhesive layer 20 may be 0.4 to 0.7 μm.

The thickness of the laminate 100 may be 0.3 to 0.5 mm. If the thickness of the laminate is too thin, energy and process are excessively consumed for rolling, and if the thickness is too thick, properties unsuitable for high frequency applications may be exhibited.

The electrical steel sheet laminate 100 according to an embodiment of the present invention may further include an insulating film 30 positioned on the surface of the electrical steel sheet 10 present in the outermost layer. The insulating film 30 may be located on the opposite side of the surface where the electrical steel sheet 10 and the adhesive layer 20 are in contact.

Since the insulating film 30 is widely known, a detailed description thereof will be omitted.

2 and 3 schematically show a method of manufacturing an electrical steel sheet laminate according to an embodiment of the present invention.

The manufacturing method of the electrical steel sheet laminate of one embodiment of the present invention comprises the steps of: preparing a hot-rolled sheet by hot rolling a slab; manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet; Laminating the cold-rolled sheet, the step of laminating by inserting an adhesive composition in the middle of each layer; manufacturing a multi-layer cold-rolled sheet by skin-passing the laminated cold-rolled sheet; and final annealing of the multi-layer cold-rolled sheet.

Hereinafter, each step will be described in detail.

First, a hot-rolled sheet is manufactured by hot-rolling a slab. For the alloy component of the slab, the description overlapping with the alloy component of the electrical steel sheet 10 described above will be omitted. Since there is no substantial change in the alloy composition during the manufacturing process of the laminate, the alloy composition of the slab and the electrical steel sheet 10 is substantially the same.

Before hot rolling the slab, molten steel is first solidified in a continuous casting process to manufacture a slab. The slab is charged in a heating furnace and reheated at 1,050 to 1,200 °C.

In order to prevent re-dissolution of precipitates during reheating, it is preferable to reheat at as low a temperature as possible, so it may be reheated at 1,200° C. or less. When the reheating temperature is less than 1,050° C., the deformation resistance at the time of hot rolling becomes too large, and it is difficult to roll.

During hot rolling, the thickness may be 2.5 mm or less. This is to minimize the adverse (111) recrystallization texture when the cold rolling reduction rate is high later.

After the hot-rolled sheet is manufactured, the method may further include annealing the hot-rolled sheet. When the hot-rolled sheet annealing temperature is less than 850°C, the structure does not grow or grows fine, so that the synergistic effect of magnetic flux density is small. On the other hand, when the annealing temperature exceeds 1,150° C., the magnetic properties are rather deteriorated, and the rolling workability may deteriorate due to the deformation of the plate shape. Therefore, the hot-rolled sheet annealing temperature range may be limited to 850 to 1,150 ℃. More specifically, the hot-rolled sheet annealing temperature range may be 950 to 1,150 ℃.

Next, the hot-rolled sheet is cold-rolled to manufacture a cold-rolled sheet. The hot-rolled sheet can be pickled before. The thickness of the cold-rolled sheet may be 1 mm or less. It is possible to bond the two layers immediately after pickling without cold rolling, but in this case, the roughness of the pickling surface is high, and insulation by the intermediate adhesive may be destroyed during subsequent rolling. Therefore, it is possible to cold-roll the hot-rolled sheet to a thickness of 1 mm or less.

Next, the method may further include degreasing the cold-rolled sheet.

Next, the degreased cold-rolled sheet is laminated, and an adhesive composition is inserted in the middle of each layer to be laminated. Since the adhesive composition is the same as that described above, overlapping descriptions will be omitted.

The step of laminating by inserting an adhesive composition in the middle of each layer; may be a step of applying a metal oxide to one surface of one cold-rolled sheet, applying sucrose to one surface of the other cold-rolled sheet, and laminating the coated surfaces together. . Specifically, the metal oxide may be applied to the upper surface of the lower cold-rolled sheet, sucrose may be applied to the lower surface of the upper cold-rolled sheet, and the metal oxide and sucrose coated surfaces may be overlapped and stacked.

The applied metal oxide may be in a powder form, and sucrose may be applied to the steel sheet in a solution form by a spray method.

The amount of the adhesive composition applied per unit area of the steel sheet may be 0.3 g/m ² . Specifically, the application amount per unit area of the steel sheet of the adhesive composition is 0.3 g/m ² to 1.3 g/m ² , more specifically 0.3 g/m ² to 1.0 g/m ² , or 0.5 g/m ² to 0.8 g/m ² days can When the application amount per unit area is too small, the thickness of the adhesive layer may become too thin, and thus adhesiveness may be weakened. On the other hand, when the amount of application per unit area is too large, the thickness of the adhesive layer becomes thick, and accordingly, there may be a problem in that the area ratio is reduced.

Next, the laminated cold-rolled sheet is light-rolled (skin pass) and compressed to manufacture a multi-layered cold-rolled sheet. In order for the laminate to have a uniform thickness, re-cold rolling is required. Re-cold rolling has a reduction ratio of 10 to 20% and is different from simple compression in which thickness fluctuations do not occur substantially. At this time, the reduction ratio is calculated as ([thickness of laminate before rolling] - [thickness of laminate after rolling])/[thickness of laminate before rolling].

In the step of laminating and compressing, the metal oxide and sucrose form a saccharide salt, and curing may occur immediately. When the metal oxide is a calcium ion, the saccharide is represented by the following formula (2).

[Formula 2]

Next, the multilayer cold-rolled sheet is finally annealed. The final annealing temperature may be 500 to 1050 ℃. If the final annealing temperature is less than 500 ℃, recrystallization does not occur sufficiently, and when the final annealing temperature exceeds 1,050 ℃, carbon-based sucrose is depleted into CO ₂ . After the final annealing, the grain size of the steel sheet may be 30 to 150㎛. Passing through the final annealing furnace, most of the sucrose is caramelized. After cooling, the caramelized sucrose has viscoelasticity and can maintain the bonding strength of the steel sheet. Specifically, the final annealing temperature may be 850 to 1050 ℃.

At this time, the atmosphere of the final annealing is a mixed gas atmosphere in which 20% hydrogen and 80% nitrogen are mixed, and the annealing time is preferably 2 minutes or more.

Thereafter, the method may further include forming an insulating film on the outermost surface of the laminate.

Hereinafter, the present invention will be described in more detail through examples. However, it is necessary to note that the following examples are only intended to illustrate the present invention in more detail and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the claims and matters reasonably inferred therefrom.

Example

After reheating the slab composed of 3.1% Si, 0.9% Al, 0.3% Mn, 0.002% N, 0.003% C, 0.01% P, 0.002% S, 0.0015% N and other unavoidable impurities by weight, 2.0mm It was hot rolled to thickness. The hot-rolled sheet was annealed at 1100°C and pickled. Thereafter, after cold rolling to 0.27 mm, the adhesive composition of Table 1 was applied, and the two substrates were subjected to skin pass rolling at a reduction ratio of 10 to 20%. The remaining components of the adhesive composition except for sucrose and CaO of Table 1 are water. The concentration of the used sucrose aqueous solution was 50% by weight. The amount of the adhesive applied in Table 1 is the amount of the adhesive applied per unit area, which is a measure of the amount before competitive rolling. On the other hand, the thickness of the adhesive layer is a measurement of the thickness of the adhesive layer after light-rolling the cold-rolled sheet and performing final annealing.

Thereafter, after drying at 100° C. for 15 seconds, final annealing was performed at 1050° C. for 2 minutes in 20% hydrogen and 80% nitrogen.

High-frequency iron loss (W _10/400 ) was measured by RC average. It was measured in the rolling direction and the rolling right angle direction using a 60 X 60mm ² size single plate measuring machine and averaged, and the results are summarized in Table 2 below.

-Room temperature Peel test method

Peel adhesion (T-peel, N/mm): Specimen for peeling (T-Peeloff) measurement was prepared according to ISO 11339. After bonding two 25 x 200 mm specimens to an area of 25 x 150 mm ² , the unbonded portion was bent at 90 to prepare a T-shaped tensile specimen. The specimen prepared by the peeling method (T-Peeloff) was fixed to an upper/lower jig (JIG) with a constant force and then pulled at a constant speed and measured using an apparatus for measuring the tensile force of the stacked sample. At this time, in the case of the shearing method, the measured value was measured at the point where the interface with the minimum adhesive force among the interfaces of the laminated samples fell off. After maintaining the temperature of the specimen at 60 °C through a heating device, the adhesive force was measured.

-Hot Peel test method

Peel adhesion (T-peel, N/mm): Specimen for peeling (T-Peeloff) measurement was prepared according to ISO 11339. After bonding two 25 x 200 mm specimens to an area of 25 x 150 mm ² , the unbonded portion was bent at 90 to prepare a T-shaped tensile specimen. The specimen prepared by the peeling method (T-Peeloff) was fixed to an upper/lower jig (JIG) with a constant force and then pulled at a constant speed and measured using an apparatus for measuring the tensile force of the stacked sample. At this time, in the case of the shearing method, the measured value was measured at the point where the interface with the minimum adhesive force among the interfaces of the laminated samples fell off. The temperature of the specimen was maintained at 1000° C. for 1 minute through a heating device, and after cooling, the adhesive force was measured as described above.

note mezzanine
Adhesive component (weight ratio) Final annealing heating temperature (degrees) final annealing heating
time (minutes) Adhesive application amount
(g/m ² ) adhesive layer
thickness
(μm) electrical steel sheet
W10/400 room temperature
Peel
test hot
Peel
test One doesn't exist 1100 2 0 0 13.8 0.3 0 2 Sucrose: CaO 1:2 1100 2 0.5 0.4 0.5 0.5 1.3 3 Sucrose : CaO 1:1 1100 2 0.5 0.4 0.7 0.4 0.9 4 Sucrose: CaO 1:4 1100 2 0.5 0.4 0.8 0.3 1.0 5 Sucrose : CaO : 1:2 1100 2 0.1 0.1 11.3 0.3 0.8 6 Sucrose : CaO : 1:1 1100 2 0.1 0.1 11.4 0.3 0.6 7 Sucrose : CaO : 1:3 1100 2 0.1 0.1 11.6 0.3 0.7 8 Sucrose: CaO 1:2 1100 2 0.38 0.3 0.8 0.3 0.8 9 Sucrose: CaO 1:2 1100 2 0.88 0.7 0.8 0.3 0.8 10 Sucrose: CaO 1:2 1100 2 1.25 1.0 0.8 0.3 0.8

When the adhesive composition according to an embodiment of the present invention is used, it can be confirmed that the high-frequency iron loss is improved compared to Comparative Steel 1 formed as a single layer without an adhesive layer. In addition, when the thickness of the adhesive layer was formed too thin, it was confirmed that the hot peel characteristics and iron loss were inferior.

The present invention is not limited to the above embodiments, but can be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains can take other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that it can be implemented as Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: electrical steel sheet laminate, 10: electrical steel sheet,
20: adhesive layer, 30: insulating film

Claims (14)

An electrical steel sheet adhesive composition comprising sucrose. According to claim 1,
Further comprising a metal oxide, electrical steel sheet adhesive composition. 3. The method of claim 2,
The metal oxide is CaO, SiO ₂ , Al ₂ O ₃ , AlN, BN, MgO and ZrO ₂ At least one selected from the group consisting of, electrical steel sheet adhesive composition. 3. The method of claim 2,
The sucrose: metal oxide is mixed in a weight ratio of 1:1 to 1:4, an electrical steel sheet adhesive composition. Two or more layers of electrical steel are laminated,
An adhesive layer is interposed between the electrical steel sheets,
The adhesive layer is an electrical steel sheet laminate comprising a metal saccharide represented by the following formula (1).
[Formula 1]

6. The method of claim 5,
The metal ion of the metal saccharide is calcium ion (Ca ²⁺ ), the electrical steel sheet laminate. 6. The method of claim 5,
The adhesive layer has a thickness of 0.3 μm or more, an electrical steel sheet laminate. 6. The method of claim 5,
The electrical steel sheet laminate further comprising an insulating film located on the surface of the electrical steel sheet present in the outermost. 6. The method of claim 5,
The electrical steel sheet is in weight %, Si: 3.5% or less (however, 0% is excluded), Al: 2.5% or less (however, 0% is excluded), Mn: 3% or less (however, 0% is excluded), P: 0.1% or less (however, 0% is excluded), C: 0.04% or less (however, 0% is excluded), S: 0.01% or less (however, 0% is excluded), N: 0.01% or less (however, Except for 0%) and the remainder Fe and other unavoidable impurities, the electrical steel sheet laminate. preparing a hot-rolled sheet by hot-rolling the slab;
manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet;
stacking the cold-rolled sheets by inserting an adhesive composition in the middle of each layer;
manufacturing a multi-layer cold-rolled sheet by light-rolling the laminated cold-rolled sheet; and
Comprising the step of final annealing the multi-layer cold-rolled sheet,
The adhesive composition further comprises sucrose, the method of manufacturing an electrical steel sheet laminate. 11. The method of claim 10,
The adhesive composition further comprises a metal oxide, the method of manufacturing an electrical steel sheet laminate. 11. The method of claim 10,
In the light rolling step, the reduction ratio is 10 to 20%, the method of manufacturing an electrical steel sheet laminate. 11. The method of claim 10,
Laying by inserting an adhesive composition in the middle of each layer;
A method of manufacturing an electrical steel sheet laminate, comprising the steps of applying a metal oxide to one surface of one cold-rolled sheet, applying sucrose to one surface of the other cold-rolled sheet, and laminating the coated surfaces. 11. The method of claim 10,
The slab is weight %, Si: 3.5% or less (however, 0% is excluded), Al: 2.5% or less (however, 0% is excluded), Mn: 3% or less (however, 0% is excluded), P : 0.1% or less (except 0%), C: 0.04% or less (however, excluding 0%), S: 0.01% or less (however, excluding 0%), N: 0.01% or less (however, 0%) %) and the remainder Fe and other unavoidable impurities, the method of manufacturing an electrical steel sheet laminate.

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