CN110088312B - Oriented electrical steel sheet and method for refining magnetic domain thereof - Google Patents

Oriented electrical steel sheet and method for refining magnetic domain thereof Download PDF

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CN110088312B
CN110088312B CN201780079234.1A CN201780079234A CN110088312B CN 110088312 B CN110088312 B CN 110088312B CN 201780079234 A CN201780079234 A CN 201780079234A CN 110088312 B CN110088312 B CN 110088312B
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electrical steel
steel sheet
oriented electrical
grain
trench
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CN110088312A (en
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朴世珉
韩奎锡
权五烈
权玟锡
朴钟泰
闵基荣
李原杰
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Posco Holdings Inc
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Posco Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/362—Laser etching
    • B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F4/00—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel

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  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
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  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Laser Beam Processing (AREA)
  • ing And Chemical Polishing (AREA)

Abstract

A magnetic domain refining method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: preparing a grain-oriented electrical steel sheet; a step of forming a mask layer on the surface of the oriented electrical steel sheet; irradiating laser beams to part of the mask layer to remove the mask layer to form a prefabricated groove on the oriented electrical steel plate; and a step of pickling the oriented electrical steel sheet to form grooves.

Description

Oriented electrical steel sheet and method for refining magnetic domain thereof
Technical Field
The present invention relates to an oriented electrical steel sheet and a method for refining magnetic domains thereof.
Background
The oriented electrical steel sheet is used as an iron core material of electrical products such as transformers. Therefore, in order to reduce power loss of the electrical equipment and improve energy conversion efficiency, the core material should have excellent iron loss and a steel sheet having a high duty ratio at the time of stacking and winding is required.
The grain-oriented electrical steel sheet is a functional steel sheet having a texture (also called "gaussian texture") in which grains secondarily recrystallized by hot rolling, cold rolling and annealing processes are aligned in the rolling direction to be {110} <001> oriented.
As a method for reducing the iron loss of a grain-oriented electrical steel sheet, a magnetic domain refining method is known. That is, the size of the large magnetic domain of the oriented electrical steel sheet is reduced by forming scratches or applying energy impact to the magnetic domain. In this case, when the magnetic domain is magnetized and changes direction, the amount of energy consumption can be reduced as compared with when the magnetic domain size is large. The domain refining method includes permanent domain refining which maintains the improvement effect even after the heat treatment and temporary domain refining which does not maintain the improvement effect.
The methods of refining permanent magnetic domains, which also exhibit an effect of improving the iron loss after the stress-relief heat treatment at a temperature higher than the heat treatment temperature at which Recovery (Recovery) occurs, may be classified into an etching method, a roll method, and a laser method. The etching method is a method of forming grooves (grooves) on the surface of a steel sheet by a selective electrochemical reaction in a solution, and thus it is difficult to control the shape of the grooves and to uniformly secure the core loss characteristics of a final product in the width direction. Meanwhile, there is a disadvantage of being not environment-friendly due to the acid solution used as a solvent.
A permanent magnetic domain refining method based on a press roller is a magnetic domain refining technology with an iron loss improvement effect, wherein after a protrusion shape is processed on the press roller, the press roller or a plate is pressed, so that a groove with a certain width and depth is formed on the surface of the plate, and then annealing is carried out, so that recrystallization at the bottom of the groove is locally generated. The roll method has disadvantages in that stability against machining, reliability in securing stable iron loss by thickness, and complexity in manufacturability are difficult, and iron loss and magnetic flux density characteristics are deteriorated after forming the groove (before stress relief annealing).
A method used in the laser-based permanent magnetic domain refining method is to irradiate a high-output laser beam onto the surface of a rapidly moving electrical steel plate, and form grooves (grooves) generated as the base portion melts by the laser irradiation. In order to rapidly machine the groove, a laser with a large output is used, and therefore, there is a disadvantage that the cost of purchasing and maintaining the laser is high. Further, when the groove is formed, a bump (hill-up) of molten iron is inevitably generated, and the generation of the bump causes a magnetic flux leakage. Therefore, the iron loss tends to increase. The formation of the protrusion also affects insulation, thereby causing deterioration of magnetic properties of the permanent magnetic domain refining steel sheet. The method used for removing the bulge uses water washing, brushing, acid washing. However, roughness is seriously impaired during the process of scraping the surface with a brush or melting by an acid, and the ridges are not easily removed.
Disclosure of Invention
Technical problem to be solved
The present invention is directed to provide an oriented electrical steel sheet and a domain refining method thereof, which improve magnetic properties and duty ratio at a faster production speed by combining an etching method and a laser method.
(II) technical scheme
A magnetic domain refining method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: preparing a grain-oriented electrical steel sheet; a step of forming a mask layer on the surface of the oriented electrical steel sheet; irradiating laser beams to part of the mask layer to remove the mask layer to form a prefabricated groove on the oriented electrical steel plate; and a step of pickling the oriented electrical steel sheet to form grooves.
The mask layer may include aluminum, magnesium, manganese, or oxides or complex organics thereof.
The thickness of the mask layer may be 1 μm to 10 μm.
The output of the laser beam may be 1kW to 3kW, and the irradiation speed may be 70m/s to 100 m/s.
The difference between the focal position of the laser beam and the surface of the oriented electrical steel sheet may be 200 μm or less.
The depth of the pregroove may be 2 μm to 5 μm.
In the step of forming the groove, a part of the ridge may be removed.
In the step of forming the trench, the acid concentration of the acid washing solution may be 30 to 50 vol%, and the temperature may be 50 to 90 ℃.
In the step of forming the trench, the depth of the trench may be 15 μm to 30 μm.
The step of forming the trench may further include a step of forming an insulating film layer on the mask layer and on the trench.
A grain-oriented electrical steel sheet according to one embodiment of the present invention comprises: a groove formed from a surface of the electrical steel sheet toward an inner direction of the electrical steel sheet; and a mask layer formed on a surface of the electrical steel sheet, and a surface roughness (Ra) of the groove portion may be 0.1 to 0.7 μm.
Trench width W of trench at trench depth 1/2bAnd the width W of the groove on the surface of the electrical steel plateaRatio of (W)b/Wa) And may be 0.3 to 0.8.
The depth of the trench may be 15 μm to 30 μm.
The oriented electrical steel sheet may further include an insulating film layer formed on the mask layer and the trench.
(III) advantageous effects
According to an exemplary embodiment of the present invention, a groove of a desired shape may be formed at a faster production speed.
Further, according to an exemplary embodiment of the present invention, magnetism and a duty ratio may be improved.
Drawings
FIG. 1 is a schematic representation of the surface of an oriented electrical steel sheet according to one embodiment of the present invention.
Fig. 2 is a flow diagram of a magnetic domain refining method according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of the oriented electrical steel sheet after forming a mask layer.
Fig. 4 is a schematic view of a cross section of the oriented electrical steel sheet after laser irradiation.
FIG. 5 is a schematic cross-sectional view of a grain-oriented electrical steel sheet after pickling.
Fig. 6 is a schematic cross-sectional view of the oriented electrical steel sheet after the insulating film layer is formed.
Fig. 7 is a schematic view of an enlarged cross section of the trench.
Fig. 8 is a schematic view for explaining the width and depth of the trench.
Detailed Description
The terms first, second, third, etc. herein are used to describe various portions, components, regions, layers and/or sections, but these portions, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first part, component, region, layer and/or section discussed below could be termed a second part, component, region, layer and/or section without departing from the scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, actions, elements, and/or components, but do not preclude the presence or addition of other features, integers, steps, actions, elements, components, and/or groups thereof.
If a portion is described as being on top of another portion, there may be other portions directly on top of or between the other portions. When a portion is described as being directly above another portion, there are no other portions in between.
Although not otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. To the extent that terms are defined within a dictionary, they should be interpreted as having a meaning consistent with that of the relevant art documents and disclosures made herein, and should not be interpreted in an idealized or overly formal sense.
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to easily practice the present invention. The present invention may be modified in various ways and is not limited to the embodiments described herein.
A schematic diagram of a grain-oriented electrical steel sheet 10 having refined magnetic domains according to an embodiment of the present invention is shown in fig. 1. As shown in fig. 1, a plurality of grooves 30 are formed on the surface of the grain-oriented electrical steel sheet 10 along the rolling direction.
A flow chart of a method of refining magnetic domains of a grain-oriented electrical steel sheet according to an embodiment of the present invention is schematically illustrated in fig. 2. The flow chart of the magnetic domain refining method of fig. 2 is only for illustrating the present invention, and the present invention is not limited to the flow chart shown in fig. 2. Therefore, various modifications can be made to the magnetic domain refining method.
As shown in fig. 2, a magnetic domain refining method of a grain-oriented electrical steel sheet according to an embodiment of the present invention includes: a step S10 of preparing a grain-oriented electrical steel sheet; a step S20 of forming a mask layer on the surface of the grain-oriented electrical steel sheet; a step S30 of irradiating laser beams to part of the mask layer to remove the mask layer to form a pre-groove on the oriented electrical steel sheet; and a step S40 of pickling the grain-oriented electrical steel sheet to form grooves. The details are described below in terms of the respective steps.
First, a grain-oriented electrical steel sheet is prepared in step S10. In one embodiment of the present invention, the oriented electrical steel sheet is characterized by a magnetic domain refinement method and a formed groove shape, and any oriented electrical steel sheet may be used as the oriented electrical steel sheet that is an object of the magnetic domain refinement without limitation. In particular, the effects of the present invention are exerted regardless of the alloy composition of the oriented electrical steel sheet. Therefore, a detailed description of the alloy composition of the oriented electrical steel sheet is omitted.
In one embodiment of the present invention, the oriented electrical steel sheet may use an oriented electrical steel sheet rolled to a predetermined thickness from a slab by hot rolling and cold rolling.
Next, a mask layer is formed on the surface of the grain-oriented electrical steel sheet prepared in step S20. The oriented electrical steel sheet 10 formed with the masking layer 20 is schematically shown in fig. 3. The masking layer 20 serves to prevent the base material of the steel plate from being affected by acid in the pickling step S40 described below. In addition, in the laser irradiation step S30 described below, only the mask layer 20 is removed at the portion where the laser is irradiated, and therefore, only the portion where the mask layer 20 is removed is exposed to the acid in the pickling step S40 described below, and a trench having a deeper depth can be formed from the pre-trench.
Masking layer 20 may include aluminum, magnesium, manganese, or oxides or complex organics thereof. The method of forming the mask layer is not particularly limited, but the mask layer may be formed by coating a mask coating composition in the form of a slurry containing aluminum, magnesium, manganese, or an oxide thereof and then drying.
The thickness of the mask layer 20 may be 1 μm to 10 μm. If the thickness of the masking layer 20 is too thin, the steel sheet base material is affected by the acid in the pickling step S40 described below, and the roughness of the steel sheet surface may increase, thereby adversely affecting the magnetic properties. If the thickness of the mask layer 20 is too thick, the pre-groove may not be formed to an appropriate thickness in the laser irradiation step S30 described below. Therefore, the thickness of the mask layer 20 can be controlled within the aforementioned range.
In one embodiment of the present invention, masking layer 20 is not removed and may remain. The remaining mask layer 20 serves to further impart tension.
Next, in step S30, a laser beam is irradiated to a portion of the masking layer to remove the masking layer 20 to form the pregroove 31 on the oriented electrical steel sheet 10. The oriented electrical steel sheet 10 from which a portion of the masking layer 20 is removed and the pregroove 31 is formed is schematically shown in fig. 4.
In the pickling step S40 described below, the deeper depth of the trench 30 may be formed by pickling. Therefore, in step S30, a laser beam with a lower output can be used at a faster irradiation speed. Specifically, the output of the laser beam may be 1kW to 3kW, and the irradiation speed may be 70m/s to 100 m/s. If the output of the laser beam is too low or the irradiation speed is too fast, the pregroove 31 having an appropriate depth may not be formed. In addition, if the output of the laser beam is too high or the irradiation speed is too slow, the steel sheet is melted by a large amount, which may cause the size of the generated ridge 32 to become large or a large number of ridges 32 to be generated. Therefore, the output of the laser beam and the irradiation speed can be controlled within the above-described ranges.
The difference between the focal position of the laser beam and the surface of the oriented electrical steel sheet 10 may be 200 μm or less. If the focal point is deviated from the surface too much, the depth of the pregroove 31 may not be properly formed due to energy loss of the laser beam.
The depth of the pregroove 31 may be 5 μm to 10 μm. At this time, the depth of the pregroove 31 is a length from the surface of the oriented electrical steel sheet where the groove is not formed to a groove portion formed deepest in the thickness direction (z direction). In one embodiment of the present invention, the trench 30 having a specific shape can be rapidly formed by forming the pregroove 31 by irradiating laser and then forming the pregroove 31 deeper by acid washing in the acid washing step S40.
As for the irradiation shape of the laser beam, irradiation may be performed according to the shapes of the formed pregroove 31 and groove 30. Specifically, as disclosed in fig. 1, the groove may be formed in a linear shape, and a plurality of grooves may be formed along the rolling direction (y direction), and the laser beam may be irradiated according to such a shape. The spacing between the grooves may be 1mm to 5 mm.
In addition, 2 to 6 grooves may be discontinuously formed with respect to the width direction (x direction) of the steel sheet and at an angle of 82 ° to 98 ° with respect to the rolling direction (y direction), and the laser beam may be irradiated according to such a shape.
The kind of the laser beam is not particularly limited, and a single fiber laser (single fiber laser) may be used.
Next, in step S40, the grain-oriented electrical steel sheet 10 is pickled to form the grooves 30. The oriented electrical steel sheet 10 formed with the grooves 30 is schematically shown in fig. 5. As described above, in one embodiment of the present invention, the pregroove 31 is formed by irradiating laser light at step S30, and thus the trench 30 of a desired depth can be formed even if the time for the acid cleaning is short at step S40. Further, unlike a manner in which the groove is generally formed by irradiating laser light, a specific surface roughness may be formed in the groove portion by acid washing. In addition, unlike the method of forming a trench generally by etching, the pregroove 31 is formed by irradiating laser light in step S30, so that a trench having a specific shape with a narrow lower width and a deep depth can be formed.
In step S40, not only the groove 30 but also the partial bump 32 formed in step S30 may be removed. For the way of forming the groove by irradiating laser light in general, an additional process is required for removing the bump 32, but the bump 32 can be removed simultaneously during the formation of the groove 30 without any additional process in one embodiment of the present invention. The removal of the partial ridge 32 means that a part of the plurality of ridges 32 formed is removed or a part of the ridge 32 having a higher height is removed and the height becomes lower. These protrusions 32 may adversely affect the surface properties and magnetic properties of the electrical steel sheet, and therefore need to be removed appropriately.
The acid solution used in the acid washing may have an acid concentration of 30 to 50 vol%. If the acid concentration is too low, the trench 30 having a proper depth is not formed. If the acid concentration is too high, the surface roughness of the groove 30 portion may be too rough. Therefore, an acid wash having a concentration within the aforementioned range can be used.
In the acid washing step, the temperature may be 50 ℃ to 90 ℃. The pickling efficiency can be further improved in an appropriate temperature range.
The kind of the acid washing solution is not particularly limited, and a general acid aqueous solution such as hydrochloric acid, sulfuric acid, hydrofluoric acid, etc. can be used.
The depth D of the trench 30 formed in step S40 may be 15 μm to 30 μm.
After step S40, an insulating film layer may be further formed as needed. The oriented electrical steel sheet 10 formed with the insulating film layer 30 is schematically shown in fig. 6. As shown in fig. 6, an insulating film layer 30 is formed on the mask layer 20 and the trench 30. As a specific method, the insulating film layer 30 may be formed by coating an insulating coating liquid including phosphate. As such an insulating coating liquid, a coating liquid containing colloidal silica and metal phosphate is preferably used. At this time, the metal phosphate may be Al phosphate, Mg phosphate, or a combination thereof, and the content of Al, Mg, or a combination thereof may be 15 wt% or more with respect to the weight of the insulating coating liquid.
A grain-oriented electrical steel sheet 10 according to an embodiment of the present invention includes: a groove 30 formed from a surface of the electrical steel sheet toward an inner direction of the electrical steel sheet; and a mask layer 20 formed on a surface of the electrical steel sheet, the surface roughness of the trench 30 portion being 0.1Ra to 0.7 Ra. The oriented electrical steel sheet 10, the masking layer 20, and the trench 30 have been described in detail in the foregoing magnetic domain refining method, and thus, a repetitive description thereof will be omitted.
Fig. 7 is an enlarged view of the portion of the groove 30 in fig. 6. As shown in fig. 7, roughness is formed on the portion of the trench 30. Such roughness is formed by the pickling in the pickling step S40. Unlike a method of forming a trench generally by laser irradiation or etching, the roughness of the trench 30 portion is formed rough. When the roughness of the groove 30 portion is appropriately formed, the duty ratio will be improved, and there is an effect of improving the magnetic property. In addition, when the insulating film layer 40 is formed, the adhesion between the electrical steel sheet 10 and the insulating film layer 40 may be improved. When the roughness of the trench 30 portion is excessively large, there is a possibility that a problem occurs in terms of reaction and contact with the insulating film layer 40. In one embodiment of the present invention, the roughness refers to the roughness measured according to JIS97 method.
Trench width W of trench 30 at trench depth 1/2bAnd the width W of the groove on the surface of the electrical steel plateaRatio of (W)b/Wa) And may be 0.3 to 0.8. The width W across the grooves in the surface of the electrical steel sheet is shown in FIG. 8aAnd a trench width W at a trench depth 1/2b. Trench width W at trench depth 1/2bAnd the upper width W of the groove on the surface of the electrical steel plateaRatio of (W)b/Wa) The closer to 1, the smaller the difference in width will be formed, and when a general etching method is used, this form of trench will be formed. Trench width W at trench depth 1/2bAnd the width W of the groove on the surface of the electrical steel plateaRatio of (W)b/Wa) The deeper the depth is, the closer to 0, the more sharply narrowed the width of the trench will be, width WbThe narrower and deeper the depth, the further improvements in magnetic properties and duty cycle can be achieved.
The depth D of the trench 30 may be 15 μm to 30 μm. If the depth D is shallow, there is a possibility that a sufficient domain refining effect may not be produced. If the depth is too deep, the heat-affected zone increases, and the growth of the gaussian Texture (Goss Texture) may be adversely affected.
The oriented electrical steel sheet may further include an insulating film layer 40 formed on the masking layer 20 and the trench 30. As for the insulating film layer 40, the above has been described in detail, and thus, a repetitive description is omitted.
The present invention is described in further detail below by way of examples. However, the following examples are only for illustrating the present invention, and the present invention is not limited to the following examples.
Example 1: forming a pre-groove
A cold-rolled grain-oriented electrical steel sheet having a thickness of 0.20mm was prepared. The surface of the electrical steel sheet was coated with a coating solution in which MgO and water were mixed in a weight ratio of 1:1, and then dried at 100 ℃ to form a mask layer having a thickness of 5 μm. A single fiber laser having the output as collated in table 1 below was irradiated at the irradiation speed as collated in table 1 below. At this time, the moving speed of the steel sheet is also set in table 1 below. Further, the focal position of the laser beam and the interval of the surface of the oriented electrical steel sheet are collated in the following table 1. The width and depth of the pregroove formed by laser irradiation are collated in table 1 below. The width of the pregroove refers to the width over the surface of the steel sheet.
[ Table 1]
Figure BDA0002101551780000101
Example 2: forming a trench
The steel sheets on which the pregroove was formed in inventive examples 1 to 7 were pickled with hydrochloric acid having a concentration as set forth in table 2 below, and pickling times as set forth in table 2 below. The final width W of the upper portion of the trenchaIt was kept constant at 120. mu.m. The depth D of the groove and the middle width W of the depth 1/2 are definedbUpper width to middle width ratio (W)b/Wa) The roughness of the groove portions is set forth in table 2 below. The roughness was measured according to JIS97 standard.
[ Table 2]
Figure BDA0002101551780000102
Comparative example 1: forming trenches by etching
A cold-rolled grain-oriented electrical steel sheet having a thickness of 0.20mm was prepared. The surface of the steel plate was coated with a photoresist layer patterned in the shape of a trench and plated in a NaCl electrolytic bath at 30A/dm2The trenches were formed by performing electrolytic etching at the current density of (1), thereby forming the trenches as set forth in table 3 below. The final width W of the upper portion of the trenchaIt was kept constant at 120. mu.m. The depth D of the groove and the middle width W of the depth 1/2 are definedbUpper width to middle width ratio (W)b/Wa) The roughness of the groove portions is set forth in table 3 below.
Comparative example 2: forming trenches by laser irradiation
A cold-rolled grain-oriented electrical steel sheet having a thickness of 0.23mm was prepared. A laser beam having an output of 2kW was irradiated onto the surface of the steel sheet at a speed of 100m/s, thereby forming grooves. The final width W of the upper portion of the trenchaIt was kept constant at 120. mu.m. The depth D of the groove and the middle width W of the depth 1/2 are definedbUpper width to middle width ratio (W)b/Wa) The roughness of the groove portions is set forth in table 3 below.
[ Table 3]
Classification Depth of groove (μm) Groove middle width (mum) Wb/WaRatio of Roughness (μm)
Comparative example 1 20 110 0.91 0.2
Comparative example 2 20 50 0.42 0.16
Example 3: formation of insulating film layer and measurement of magnetic property and duty ratio
An insulating coating liquid containing colloidal silica and metal phosphate was coated on the grooved oriented electrical steel sheets of inventive examples 8 to 17 and comparative examples 1 and 2 and heat-treated to form an insulating film layer on the surface of the steel sheets, and the magnetic properties and duty ratios were measured and post-finished in table 4 below.
As for the iron loss improvement rate, the iron loss (W) of the electrical steel sheet before the groove is formed by the laser beam irradiation1) And the core loss (W) after the groove is formed by irradiating laser2) After the measurement, the compound is passed through (W)1-W2)/W1The iron loss improvement rate is calculated.
For the duty ratio, the duty ratio was determined by calculating the iron area relative to the total area after stacking 14 specimens of 60mm × 300 mm.
[ Table 4]
Classification Iron loss improvement (%) Duty ratio (%)
Inventive example 8 7 96.2
Inventive example 9 6 95.8
Inventive example 10 7 96.4
Inventive example 11 6 96.5
Inventive example 12 5 95.9
Inventive example 13 10 97.7
Inventive example 14 10 96.8
Invention of the inventionExample 15 9 97.2
Inventive example 16 10 97.3
Inventive example 17 10 97
Comparative example 1 4 95
Comparative example 2 6 97
As shown in table 4 above, inventive examples 8 to 17 can obtain significantly superior core loss improvement rate and duty ratio compared to comparative examples 1 and 2 in which the trench is formed by the conventional general etching method and laser irradiation method. Further, invention examples 13 to 17 in which the groove shape was controlled to a specific shape could obtain more excellent iron loss improvement rate and duty ratio.
The present invention can be implemented in various different ways and is not limited to the embodiments described, and a person of ordinary skill in the art to which the present invention pertains can understand that the present invention can be implemented in other specific ways without changing the technical idea or essential features of the present invention. Accordingly, it should be understood that the above-described embodiments are illustrative, and not restrictive, of the invention.
Description of the reference numerals
10: electrical steel sheet 20: mask layer
30: groove 31: prefabricated trench
32: the bump 40: insulating film layer

Claims (11)

1. A method for refining magnetic domains of a grain-oriented electrical steel sheet, comprising:
preparing a grain-oriented electrical steel sheet;
a step of forming a mask layer on the surface of the grain-oriented electrical steel sheet;
irradiating laser beams to part of the mask layer to remove the mask layer to form a prefabricated groove on the oriented electrical steel plate;
a step of pickling the grain-oriented electrical steel sheet to form a groove; and
a step of forming an insulating film layer on the mask layer and the trench,
the surface roughness of the groove part is 0.1 to 0.7 μm;
the mask layer comprises aluminum, magnesium, manganese or oxides thereof.
2. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
the thickness of the mask layer is 1 μm to 10 μm.
3. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
the output of the laser beam is 1kW to 3kW, and the irradiation speed is 70m/s to 100 m/s.
4. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
the difference between the focal position of the laser beam and the surface of the oriented electrical steel sheet is 200 μm or less.
5. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
the depth of the pregroove is 5 μm to 10 μm.
6. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
in the step of forming the groove, a part of the ridge is removed.
7. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
in the step of forming the trench, the acid concentration of the acid pickling solution is 30 to 50 vol%, and the temperature is 50 to 90 ℃.
8. The magnetic domain refining method of a grain-oriented electrical steel sheet according to claim 1, wherein,
in the step of forming the trench, the depth of the trench is 15 μm to 30 μm.
9. A grain-oriented electrical steel sheet comprising:
a groove formed from a surface of the electrical steel sheet toward an inner direction of the electrical steel sheet;
a mask layer formed on a surface of the electrical steel sheet; and
an insulating film layer formed on the mask layer and the trench,
the surface roughness of the groove portion is 0.1 to 0.7 μm,
the mask layer comprises aluminum, magnesium, manganese or oxides thereof.
10. The oriented electrical steel sheet as claimed in claim 9,
the trench has a trench width W at a trench depth 1/2bAnd the width W of the groove on the surface of the electrical steel plateaRatio W ofb/WaIs 0.3 to 0.8.
11. The oriented electrical steel sheet as claimed in claim 9,
the depth of the groove is 15 μm to 30 μm.
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