Amorphous metal ribbon, manufacturing method thereof, and magnetic core

Abstract

To provide an amorphous metal ribbon that, even when measured in a condition with high magnetic flux density, has low iron loss and exciting current, a method for manufacturing the same, and a magnetic core.SOLUTION: An amorphous metal ribbon has a plurality of laser irradiation mark rows consisting of a plurality of laser irradiation marks arranged in a row. When the interval between the laser irradiation mark rows adjacent to each other is d1, the interval between the laser irradiation marks in the laser irradiation mark rows is d2, the diameter of the laser irradiation marks is d3, and the number density D of the laser irradiation marks is (1 / d1)×(1 / d2), the number density D of the laser irradiation marks is 0.05 / mm2 or more and 0.50 / mm2 or less. When the area occupancy rate A of the laser irradiation marks is D×(d3 / 2)2×π×100, the area occupancy rate A of the laser irradiation marks is 0.0035% or more and 0.040% or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an amorphous metal ribbon, a manufacturing method for the amorphous metal ribbon, and a magnetic core. [Background technology]

[0002] Patent Document 1 discloses an Fe-based amorphous alloy ribbon having a plurality of laser irradiation mark rows each composed of a plurality of laser irradiation marks. In this Fe-based amorphous alloy ribbon, the interval between the laser irradiation mark rows (line interval d1) is 10 to 60 mm, and the interval between the laser irradiation marks (spot interval d2) is 0.10 to 0.50 mm. The number density D of the laser irradiation marks is expressed as D=(1 / d1)×(1 / d2), and is 0.05 to 0.50 marks / mm. 2 It is.

[0003] Such an Fe-based amorphous alloy ribbon has low iron loss at an excitation magnetic flux density of 1.45 T and suppresses an increase in excitation power, thereby enabling the realization of an iron core and a transformer with excellent performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 189813 Summary of the Invention [Problem to be solved by the invention]

[0005] In the Fe-based amorphous alloy ribbon described in Patent Document 1, the subdivision of magnetic domains is optimized and iron loss and excitation power are reduced by controlling the line interval d1, spot interval d2, and number density D of the laser irradiation marks. However, there is room for further improvement in the subdivision of magnetic domains in the Fe-based amorphous alloy ribbon. [Means for solving the problem]

[0006] The amorphous metal strip according to the application example of the present invention is A laser irradiation mark row is formed by a plurality of laser irradiation marks arranged in a row, The distance between adjacent rows of laser irradiation marks is d1, The distance between the laser irradiation marks in the laser irradiation mark row is d2, The diameter of the laser irradiation mark is d3, When the number density D of the laser irradiation marks is (1 / d1) × (1 / d2), The number density D of the laser irradiation marks is 0.05 pieces / mm 2 More than 0.50 pieces / mm 2 is as follows: The area occupancy rate A of the laser irradiation mark is D × (d3 / 2) 2 When it is set to ×π×100, The area occupancy rate A of the laser irradiation marks is 0.0035% or more and 0.040% or less. the law of nature, The coefficient of variation obtained by dividing the standard deviation of the equivalent circle diameter of 100 laser irradiation marks by the average value is 8% or more and 30% or less. It is characterized by:

[0007] A method for producing an amorphous metal ribbon according to an application example of the present invention includes the steps of: A step of preparing a material ribbon having a main surface made of an amorphous metal; A step of performing laser processing on the main surface of the material ribbon to obtain an amorphous metal ribbon having a plurality of laser irradiation mark rows each including a plurality of laser irradiation marks arranged in a row; having The distance between adjacent rows of laser irradiation marks is d1, The distance between the laser irradiation marks in the laser irradiation mark row is d2, The diameter of the laser irradiation mark is d3, When the number density D of the laser irradiation marks is (1 / d1) × (1 / d2), The number density D of the laser irradiation marks is 0.05 pieces / mm 2 More than 0.50 pieces / mm 2 is as follows: The area occupancy rate A of the laser irradiation mark is D × (d3 / 2)2 When it is set to ×π×100, The area occupancy rate A of the laser irradiation marks is 0.0035% or more and 0.040% or less. the law of nature, The coefficient of variation obtained by dividing the standard deviation of the equivalent circle diameter of 100 laser irradiation marks by the average value is 8% or more and 30% or less. It is characterized by:

[0008] The magnetic core according to the application example of the present invention is The present invention is characterized by including an amorphous metal ribbon according to an application example of the present invention. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an amorphous metal ribbon according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an enlarged view of part A1 in FIG. [Diagram 3] 2 is a flowchart for explaining a method for producing an amorphous metal ribbon according to an embodiment. [Figure 4] FIG. 2 is a schematic diagram showing a magnetic core according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An amorphous metal ribbon, a manufacturing method for an amorphous metal ribbon, and a magnetic core according to the present invention will be described in detail below with reference to preferred embodiments shown in the accompanying drawings.

[0011] 1. Amorphous metal ribbon The amorphous metal ribbon according to the embodiment is a ribbon made of an amorphous metal. An amorphous metal is a metal that does not have a crystal structure. For example, a plurality of amorphous metal ribbons are stacked to form a laminate. Such a laminate is used as a magnetic core. The magnetic core is used, for example, in a transformer or the like.

[0012] Fig. 1 is a perspective view that shows a schematic diagram of an amorphous metal ribbon according to an embodiment. Fig. 2 is an enlarged view of a portion A1 in Fig. 1. In Fig. 1, the length direction of the amorphous metal ribbon 1 is designated as D1, the width direction as D2, and the thickness direction as D3. In Fig. 1, these three directions are indicated by arrows. Each direction described later includes both the direction from the base end to the tip end of the arrow and the direction from the tip end to the base end.

[0013] In FIG. 1, the amorphous metal ribbon 1 has a length L1, a width W1, and a thickness t1. The ribbon has a first surface 11 and a second surface 12 which are in a front-back relationship, and the thickness, which is the distance between the first surface 11 and the second surface 12, is sufficiently shorter than the width and length of the first surface 11 and the second surface 12. The width of the first surface and the second surface, i.e., the width W1 of the amorphous metal ribbon 1, is determined by the manufacturing device and manufacturing method of the amorphous metal ribbon 1 and is not particularly limited, but is preferably 5 mm or more, more preferably 10 mm or more and 200 mm or less, and even more preferably 20 mm or more and 100 mm or less.

[0014] The length of the first surface 11 and the second surface 12, i.e., the length L1 of the amorphous metal ribbon 1, is determined when the amorphous metal ribbon 1 is manufactured and is therefore not particularly limited, and may be longer than the width W1 of the amorphous metal ribbon 1. As an example, the length L1 of the amorphous metal ribbon is preferably 1.5 times or more, and more preferably 2.0 times or more, the width W1 of the amorphous metal ribbon 1.

[0015] Examples of amorphous metals include Fe-based amorphous alloys such as Fe-Si-B, Fe-Si-BC, Fe-Si-B-Cr-C, Fe-Si-Cr, Fe-B, Fe-BC, Fe-PC, Fe-Co-Si-B, Fe-Si-B-Nb, and Fe-Zr-B, Ni-based amorphous alloys such as Ni-Si-B and Ni-PB, and Co-based amorphous alloys such as Co-Si-B. Among these, Fe-based amorphous alloys have excellent soft magnetic properties and high saturation magnetic flux density, and are therefore useful as a constituent material of the amorphous metal ribbon 1 used in magnetic cores and the like.

[0016] The thickness t1 of the amorphous metal ribbon 1, i.e., the distance between the first surface 11 and the second surface 12 in the thickness direction D3, is not particularly limited, and is preferably 10 μm to 50 μm, more preferably 20 μm to 35 μm. The amorphous metal ribbon 1 having such a thickness t1 achieves both sufficient mechanical strength and reduced eddy current loss.

[0017] As shown in Figs. 1 and 2, the amorphous metal ribbon 1 according to the embodiment has a laser irradiation mark row 16 formed on a first surface 11 and composed of a plurality of laser irradiation marks 15 arranged in a row.

[0018] 2, in the laser irradiation mark row 16, laser irradiation marks 15 each having a substantially circular shape in a plan view are lined up in a row along the width direction D2 at a predetermined distance. In other words, the laser irradiation mark row 16 is a collection of laser irradiation marks 15 lined up in a row along the width direction D2. The laser irradiation marks 15 are processing marks formed by irradiating the first surface 11 with a laser beam, and refer to processing marks that have become concave due to the amorphous metal melting upon receiving the energy of the laser beam.

[0019] By providing such laser irradiation marks 15 so as to satisfy a predetermined arrangement condition, the subdivision of the magnetic domains is optimized in the amorphous metal ribbon 1. This makes it possible to reduce, in particular, the abnormal eddy current loss caused by the movement of the domain walls that are the boundaries between the magnetic domains, and to reduce the excitation power.

[0020] 1.1.Line Spacing The distance between the rows of laser irradiation marks 16 shown in FIG. 1 is defined as the line distance d1. The line distance d1 is preferably 10 mm or more and 60 mm or less, more preferably 10 mm or more and 50 mm or less, and further preferably 10 mm or more and 30 mm or less. When the line distance d1 is within the above range, the arrangement density of the rows of laser irradiation marks 16 in the amorphous metal ribbon 1 can be optimized. As a result, even when measurements are performed under conditions of high magnetic flux density, the iron loss and excitation power of the amorphous metal ribbon 1 can be reduced.

[0021] If the line interval d1 falls below the lower limit, the excitation power of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may increase depending on other arrangement conditions of the laser irradiation mark 15 and the laser irradiation mark row 16. On the other hand, if the line interval d1 exceeds the upper limit, the iron loss of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may increase depending on other arrangement conditions of the laser irradiation mark 15 and the laser irradiation mark row 16.

[0022] In addition, adjacent laser irradiation mark rows 16 are preferably substantially parallel to each other, but may be non-parallel. Also, the laser irradiation mark rows 16 may have a mixture of parallel and non-parallel portions. In addition, "parallel" between the laser irradiation mark rows 16 means that the angle between the laser irradiation mark rows 16 is 10° or less.

[0023] 1 are substantially parallel to the width direction D2, they may be non-parallel. Furthermore, there may be a mixture of parts where the laser irradiation mark row 16 and the width direction D2 are parallel and parts where they are non-parallel. Note that the laser irradiation mark row 16 being "parallel" to the width direction D2 means that the angle between the laser irradiation mark row 16 and the width direction D2 is 10° or less.

[0024] The line interval d1 is the distance between the centers of the laser irradiation marks 15 measured in the middle of the width W1 of the amorphous metal ribbon 1. The middle refers to a region having a width half the width W1, centered on the middle point of the width W1. Therefore, the row of laser irradiation marks 16 may extend over the entire width W1 of the amorphous metal ribbon 1, or may extend over only a part of the width W1, as long as at least a part of the row of laser irradiation marks 16 is provided in the middle. In other words, the row of laser irradiation marks 16 may be interrupted in part, or the length in the width direction D2 may be shorter than the width W1 of the amorphous metal ribbon 1.

[0025] The intervals between the laser irradiation mark rows 16 may be constant over the entire amorphous metal ribbon 1 or may be partially different. In other words, when the intervals between the laser irradiation mark rows 16 are measured at multiple locations in the middle of the width W1 of one amorphous metal ribbon 1, the multiple measured values ​​may be the same or different from each other. In the latter case, the average value of the five measured values ​​is set to the line interval d1 of the amorphous metal ribbon 1.

[0026] The laser irradiation marks 15 may be provided on only one of the first surface 11 and the second surface 12, or on both. When provided on both, it is sufficient that the range of the line interval d1 is satisfied when the laser irradiation marks 15 provided on the second surface 12 are projected onto the first surface 11 and the projected laser irradiation marks 15 and the laser irradiation marks 15 provided on the first surface 11 are combined.

[0027] 1.2.Spot Spacing The distance between the laser irradiation marks 15 in the row of laser irradiation marks 16 shown in FIG. 1 is defined as the spot distance d2. The spot distance d2 is preferably 0.10 mm or more and 0.50 mm or less, more preferably 0.15 mm or more and 0.40 mm or less, and even more preferably 0.20 mm or more and 0.40 mm or less. When the spot distance d2 is within the above range, the arrangement density of the laser irradiation marks 15 in the row of laser irradiation marks 16 can be optimized. As a result, even when measurements are performed under conditions of high magnetic flux density, the iron loss and excitation power of the amorphous metal ribbon 1 can be reduced.

[0028] If the spot interval d2 falls below the lower limit, the excitation power of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may increase depending on other arrangement conditions of the laser irradiation mark 15 and the laser irradiation mark row 16. On the other hand, if the spot interval d2 exceeds the upper limit, the iron loss of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may increase depending on other arrangement conditions of the laser irradiation mark 15 and the laser irradiation mark row 16.

[0029] The spot interval d2 is the distance between the centers of the laser irradiation marks 15 measured in the middle of the width W1 of the amorphous metal ribbon 1. The center of the laser irradiation mark 15 is the center of a perfect circle inscribed in the laser irradiation mark 15.

[0030] The intervals between the laser irradiation marks 15 may be constant over the entire amorphous metal ribbon 1 or may vary partially. In other words, when the intervals between the laser irradiation marks 15 are measured at multiple points in the middle of the width W1 of one amorphous metal ribbon 1, the multiple measured values ​​may be the same or different from each other. In the latter case, the average value of the five measured values ​​is set as the spot interval d2 of the amorphous metal ribbon 1.

[0031] In addition, when the laser irradiation mark 15 is provided on both the first surface 11 and the second surface 12, the range of the spot spacing d2 is satisfied when the laser irradiation mark 15 provided on the second surface 12 is projected onto the first surface 11 and the projected laser irradiation mark 15 and the laser irradiation mark 15 provided on the first surface 11 are combined.

[0032] 1.3.Spot diameter The circle-equivalent diameter of the laser irradiation mark 15 shown in Fig. 2 is defined as a spot diameter d3. The spot diameter d3 is preferably 0.010 mm or more and 0.30 mm or less, more preferably 0.020 mm or more and 0.25 mm or less, and further preferably 0.030 mm or more and 0.20 mm or less. When the spot diameter d3 is within the above range, the magnetic domains can be efficiently subdivided by the laser irradiation mark 15. In addition, the decrease in mechanical strength of the amorphous metal ribbon 1 caused by the formation of the laser irradiation mark 15 can be suppressed.

[0033] If the spot diameter d3 is below the lower limit, depending on other arrangement conditions of the laser irradiation marks 15 and the laser irradiation mark array 16, the magnetic domains may not be sufficiently subdivided, and the iron loss and excitation power of the amorphous metal ribbon 1 measured under conditions of high magnetic flux density may increase. On the other hand, if the spot diameter d3 is above the upper limit, the mechanical strength of the amorphous metal ribbon 1 may decrease.

[0034] The spot diameter d3 is the average value of the circle-equivalent diameters of 10 or more laser irradiation marks 15 measured at the middle part of the width W1 of the amorphous metal ribbon 1. The circle-equivalent diameter is the diameter of a perfect circle having the same area as the laser irradiation mark 15 when the first surface 11 is viewed in plan.

[0035] The circular equivalent diameters of the laser irradiation marks 15 may be the same or different from each other.

[0036] However, in consideration of the effect of the laser irradiation marks 15 on the mechanical strength of the amorphous metal ribbon 1, it is preferable that the circle-equivalent diameter of the laser irradiation marks 15 has some variation. This makes it possible to suppress local concentration of stress when the amorphous metal ribbon 1 is curved. As a result, even if the laser irradiation marks 15 are arranged at high density, the mechanical strength of the amorphous metal ribbon 1 is less likely to decrease.

[0037] Specifically, first, the standard deviation and average value of the circle-equivalent diameters of 100 laser irradiation marks 15 are calculated in the middle of the width W1 of the amorphous metal ribbon 1. Next, the standard deviation is divided by the average value to calculate a coefficient of variation. This coefficient of variation is an index showing the degree of variation in the circle-equivalent diameters of the laser irradiation marks 15, and the greater the coefficient, the greater the degree of variation. In the amorphous metal ribbon 1, this coefficient of variation is preferably 3% or more, more preferably 3% to 50%, and even more preferably 8% to 30%. By setting the degree of variation in the circle-equivalent diameters of the laser irradiation marks 15 within the above range, stress concentration associated with moderate variation is alleviated, and it is possible to arrange the laser irradiation marks 15 at a high density while suppressing a decrease in the mechanical strength of the amorphous metal ribbon 1. As a result, the degree of freedom in arranging the laser irradiation marks 15 can be increased, and the iron loss and excitation power of the amorphous metal ribbon 1 measured under conditions of high magnetic flux density can be sufficiently reduced.

[0038] If the coefficient of variation is below the lower limit, stress may be concentrated locally when the amorphous metal ribbon 1 is curved, resulting in a risk of a decrease in the mechanical strength of the amorphous metal ribbon 1. On the other hand, the coefficient of variation may be above the upper limit, but depending on other arrangement conditions of the laser irradiation mark 15 and the laser irradiation mark row 16, the excitation power of the amorphous metal ribbon 1 measured under conditions of high magnetic flux density may increase, or iron loss may not be sufficiently suppressed.

[0039] 1.4. Number density of laser irradiation marks The number density D of the laser irradiation marks 15 can be expressed by using the line interval d1 [mm] and the spot interval d2 [mm] in the amorphous metal ribbon 1. Specifically, the number density D of the laser irradiation marks 15 is expressed as (1 / d1)×(1 / d2). The number density D is an index representing the arrangement density based on the number of laser irradiation marks 15. The number density D in the amorphous metal ribbon 1 is 0.05 pieces / mm 2 More than 0.50 pieces / mm 2 It is said to be less than 0.10 pieces / mm 2 More than 0.40 pieces / mm 2 It is preferable that the number of particles is 0.15 / mm or less. 2 More than 0.35 pieces / mm 2 It is more preferable that the number density D is equal to or less than 1000 nm. If the number density D is within the above range, the subdivision of the magnetic domains by the laser irradiation marks 15 can be optimized, and even when measurements are performed under conditions of high magnetic flux density, the iron loss and excitation power of the amorphous metal ribbon 1 can be reduced. Furthermore, if the number density D is within the above range, the influence of the laser irradiation marks 15 on the mechanical strength of the amorphous metal ribbon 1 can be reduced. Therefore, even when the amorphous metal ribbon 1 is curved, the amorphous metal ribbon 1 is less likely to break, and a good curved state can be maintained.

[0040] If the number density D is below the lower limit, the iron loss of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may not be sufficiently reduced. On the other hand, if the number density D is above the upper limit, the increase in the excitation power of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may not be sufficiently suppressed. In addition, when the amorphous metal ribbon 1 is curved, the amorphous metal ribbon 1 may be easily damaged, such as broken.

[0041] The number density D is calculated from a region in which the laser irradiation mark row 16 is arranged in the middle of the width W1 of the amorphous metal ribbon 1 and the length in the longitudinal direction D1 is 1 m or more. When the length L1 of the amorphous metal ribbon 1 is less than 1 m, the number density D is calculated from the entire length.

[0042] Furthermore, when laser irradiation marks 15 are provided on both first surface 11 and second surface 12, it is sufficient that the range of number density D is satisfied when laser irradiation marks 15 provided on second surface 12 are projected onto first surface 11 and the projected laser irradiation marks 15 and the laser irradiation marks 15 provided on first surface 11 are combined.

[0043] 1.5. Area occupancy rate of laser irradiation marks The area occupancy A of the laser irradiation mark 15 can be expressed by using the spot diameter d3 and the number density D in the amorphous metal ribbon 1. Specifically, the area occupancy A [%] of the laser irradiation mark 15 can be expressed as D×(d3 / 2) 2×π×100. The area occupancy rate A is an index representing the arrangement density based on the area of ​​the laser irradiation mark 15. The area occupancy rate A in the amorphous metal ribbon 1 is set to be 0.0035% or more and 0.040% or less, preferably 0.0050% or more and 0.030% or less, and more preferably 0.010% or more and 0.025% or less. If the area occupancy rate A is within the above range, the subdivision of the magnetic domain in the laser irradiation mark 15 can be optimized, and even when measured under a condition of high magnetic flux density, the iron loss and excitation power of the amorphous metal ribbon 1 can be reduced. In addition, if the area occupancy rate A is within the above range, the influence of the laser irradiation mark 15 on the mechanical strength of the amorphous metal ribbon 1 can be suppressed to be small. Therefore, even when the amorphous metal ribbon 1 is curved, the amorphous metal ribbon 1 is less likely to break, and a good curved state can be maintained.

[0044] If the area occupancy A is below the lower limit, the iron loss of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may not be sufficiently reduced. On the other hand, if the area occupancy A is above the upper limit, the increase in the excitation power of the amorphous metal ribbon 1 measured under high magnetic flux density conditions may not be sufficiently suppressed. In addition, when the amorphous metal ribbon 1 is curved, the amorphous metal ribbon 1 may be easily damaged, such as broken.

[0045] The area occupancy rate A is calculated from a region in which the laser irradiation mark row 16 is arranged in the middle of the width W1 of the amorphous metal ribbon 1 and the length in the longitudinal direction D1 is 1 m or more. When the length L1 of the amorphous metal ribbon 1 is less than 1 m, the area occupancy rate A is calculated from the entire length.

[0046] Furthermore, in the case where the laser irradiation mark 15 is provided on both the first surface 11 and the second surface 12, the laser irradiation mark 15 provided on the second surface 12 is projected onto the first surface 11, and the range of the above-mentioned area occupancy rate A is satisfied when the projected laser irradiation mark 15 and the laser irradiation mark 15 provided on the first surface 11 are combined.

[0047] As described above, the amorphous metal ribbon 1 according to this embodiment has a plurality of laser irradiation mark rows 16 each composed of a plurality of laser irradiation marks 15 arranged in a row. In this amorphous metal ribbon 1, the distance between adjacent laser irradiation mark rows 16 is defined as line distance d1, the distance between laser irradiation marks 15 in the laser irradiation mark row 16 is defined as spot distance d2, the diameter of the laser irradiation marks 15 is defined as spot diameter d3, and the number density D of the laser irradiation marks 15 is defined as (1 / d1)×(1 / d2).

[0048] In the amorphous metal ribbon 1, the number density D of the laser irradiation marks 15 is 0.05 pieces / mm 2 More than 0.50 pieces / mm 2 The area occupancy rate A of the laser irradiation mark 15 is D×(d3 / 2). 2 ×π×100, the area occupancy A of the laser irradiation mark 15 is 0.0035% or more and 0.040% or less.

[0049] According to such a configuration, the arrangement density based on the number and area of ​​the laser irradiation marks 15 can be optimized, and the subdivision of the magnetic domains by the laser irradiation marks 15 can be optimized. As a result, even when measured at a relatively high magnetic flux density of, for example, 1.45 T, the iron loss and excitation power of the amorphous metal ribbon 1 can be reduced. Therefore, when used in a transformer, for example, the amorphous metal ribbon 1 according to this embodiment can contribute to miniaturizing the transformer and also to improving the efficiency of the transformer.

[0050] In addition, such amorphous metal ribbon 1 can suppress damage such as breakage even when it is bent. Therefore, it can be bent with a small bending radius, and the magnetic core can be made smaller. From this point of view, the amorphous metal ribbon 1 also contributes to the miniaturization of transformers and the like.

[0051] As described above, in the amorphous metal ribbon 1 according to this embodiment, the line interval d1 between the rows of laser irradiation marks 16 is preferably 10 mm or more and 60 mm or less. The spot interval d2 between the laser irradiation marks 15 is preferably 0.10 mm or more and 0.50 mm or less. Furthermore, the spot diameter d3 of the laser irradiation marks 15 is preferably 0.010 mm or more and 0.30 mm or less.

[0052] According to such a configuration, it is possible to particularly optimize the subdivision of the magnetic domains in the laser irradiation mark 15. As a result, it is possible to sufficiently reduce the iron loss and the excitation power of the amorphous metal ribbon 1.

[0053] 1.6.Alloy composition As described above, the amorphous metal constituting the amorphous metal ribbon 1 is preferably an Fe-based amorphous alloy.

[0054] As the Fe-based amorphous alloy, among the above-mentioned series, Fe-Si-B alloys or Fe-Si-BC alloys are particularly preferably used. Among them, Fe-Si-B alloys are composed of Fe, Si, B and impurities. Fe-Si-B alloys have a chemical composition in which, when the total content of Fe, Si and B is taken as 100 atomic %, the Fe content is 78 atomic % or more, the B content is 11 atomic % or more, and the total content of Si and B is 17 atomic % or more and 22 atomic % or less.

[0055] Fe is a metal element with a large magnetic moment, and determines the magnetic flux density of the amorphous metal ribbon 1. The Fe content is preferably 80 atomic % or more and 82 atomic % or less.

[0056] Si and B affect the amorphous forming ability of the Fe-based amorphous alloy. The Si content is preferably 2.0 atomic % or more and 6.0 atomic % or less, and more preferably 3.5 atomic % or more and 6.0 atomic % or less. The B content is preferably 12 atomic % or more and 16 atomic % or less, and more preferably 13 atomic % or more and 16 atomic % or less. As mentioned above, the total content of Si and B is preferably 17 atomic % or more and 22 atomic % or less.

[0057] In the Fe-based amorphous alloy having such a chemical composition, by setting the Fe content within the above range, it is possible to increase the amorphous forming ability and the magnetic flux density. Therefore, it is possible to realize an amorphous metal ribbon 1 that exhibits excellent soft magnetic properties derived from the amorphous state and has a high saturation magnetic flux density. In addition, by setting the total content of Si and B within the above range, it is possible to realize an amorphous metal ribbon 1 in which the iron loss and the excitation power are sufficiently reduced.

[0058] 1.7. Iron Loss and Excitation Power As described above, in the amorphous metal ribbon 1 according to this embodiment, the iron loss and the excitation power measured under conditions of particularly high magnetic flux density are reduced.

[0059] Specifically, the core loss of the amorphous metal ribbon 1 under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T is preferably 0.150 W / kg or less, more preferably 0.140 W / kg or less, and even more preferably 0.130 W / kg or less.

[0060] Moreover, the excitation power of the amorphous metal ribbon 1 under the conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T is preferably 0.180 VA / kg or less, more preferably 0.170 VA / kg or less, and even more preferably 0.165 VA / kg or less.

[0061] When the amorphous metal ribbon 1 satisfying such iron loss and excitation power requirements is used in, for example, a transformer, it contributes greatly to improving the efficiency of the transformer.

[0062] 1.8.Magnetic Flux Density In the amorphous metal ribbon 1 according to the present embodiment, the excitation power measured under conditions of high magnetic flux density, for example, 1.45 T or more, can be reduced, and therefore the decrease in magnetic flux density accompanying an increase in excitation power can be suppressed. Therefore, the amorphous metal ribbon 1 can achieve a high magnetic flux density. Specifically, in the amorphous metal ribbon 1, the magnetic flux density under conditions of a frequency of 60 Hz and a magnetic field of 7.9557 A / m is preferably 1.52 T or more, and more preferably 1.62 T or more. When such an amorphous metal ribbon 1 is used in, for example, a transformer, it contributes to miniaturization of the transformer.

[0063] 2. Manufacturing method of amorphous metal ribbon Next, a method for producing an amorphous metal ribbon according to an embodiment will be described. FIG. 3 is a flow chart for explaining the method for producing an amorphous metal ribbon according to the embodiment.

[0064] The manufacturing method of the amorphous metal ribbon shown in Fig. 3 includes a material preparation step S102 and a laser processing step S104. In the material preparation step S102, a material ribbon made of amorphous metal is prepared. In the laser processing step S104, one of two main surfaces, which are opposite sides of the material ribbon, is laser processed to obtain an amorphous metal ribbon having a plurality of laser irradiation mark rows made up of a plurality of laser irradiation marks arranged in a row.

[0065] In this amorphous metal ribbon, the distance between adjacent rows of laser irradiation marks is defined as line distance d1, the distance between laser irradiation marks in the row of laser irradiation marks is defined as spot distance d2, the diameter of the laser irradiation marks is defined as spot diameter d3, and the number density D of the laser irradiation marks is defined as (1 / d1) × (1 / d2).

[0066] In the case of an amorphous metal ribbon, the number density D of the laser irradiation marks is 0.05 pieces / mm 2 More than 0.50 pieces / mm 2 The area occupancy rate A of the laser irradiation mark is D × (d3 / 2). 2×π×100, the area occupancy rate A of the laser irradiation mark is 0.0035% or more and 0.040% or less.

[0067] According to this configuration, the arrangement density based on the number and area of ​​the laser irradiation marks on the manufactured amorphous metal ribbon can be optimized, and the subdivision of the magnetic domains by the laser irradiation marks can be optimized. As a result, it is possible to efficiently manufacture an amorphous metal ribbon in which the iron loss and the excitation power are reduced under conditions of high magnetic flux density. In addition, it is possible to efficiently manufacture an amorphous metal ribbon that is less likely to be damaged, such as broken, even when curved.

[0068] 2.1.Material preparation process The material ribbon is produced by a method for producing a rapidly solidified ribbon, such as a single roll method. Note that the material preparation step S102 may be a step of producing a material ribbon by such a production method, may include a step of cutting the material ribbon produced by the above-mentioned production method to a required length, or may be a step of simply preparing a material ribbon.

[0069] 2.2.Laser processing process In the laser processing step S104, at least one of the two main surfaces of the material ribbon is subjected to laser processing to form laser irradiation marks. The arrangement of the laser irradiation marks is the same as the arrangement of the laser irradiation marks 15 in the amorphous metal ribbon 1 described above.

[0070] The conditions for the laser processing vary depending on the alloy composition of the material ribbon, but as an example, the laser output in the laser processing is preferably 0.4 mJ or more and 2.5 mJ or less, and more preferably 1.0 mJ or more and 2.0 mJ or less.

[0071] The diameter of the laser beam in the laser processing determines the spot diameter d3 described above. As an example, the diameter of the laser beam is preferably 0.010 mm or more and 0.30 mm or less, and more preferably 0.020 mm or more and 0.25 mm or less.

[0072] The energy density of the laser in laser processing determines the spot diameter d3 and the depth of the laser irradiation mark. As an example, the energy density of the laser is preferably 0.01 J / mm 2 More than 1.50J / mm 2 It is preferably 0.03 J / mm or less. 2 More than 1.00J / mm 2 The following is stated.

[0073] The wavelength of the laser in the laser processing is, for example, 250 nm or more and 1100 nm or less, and preferably 900 nm or more and 1100 nm or less.

[0074] Examples of laser light sources in laser processing include YAG lasers, CO2 gas lasers, semiconductor lasers, fiber lasers, etc. Among these, fiber lasers are preferably used because they can emit high-power, high-frequency pulsed laser light. The pulse width of the pulsed laser light is preferably 50 nanoseconds or more, more preferably 100 nanoseconds or more. The pulse width is the time during which the laser is irradiated, and the smaller the pulse width, the shorter the irradiation time. By setting the pulse width within the above range, laser irradiation marks of appropriate size and depth can be efficiently formed.

[0075] 3.Magnetic core Next, the magnetic core according to the embodiment will be described. FIG. 4 is a schematic diagram showing a magnetic core according to the embodiment.

[0076] The magnetic core 10 shown in Fig. 4 is composed of a laminate 17 in which a plurality of amorphous metal ribbons 1 are laminated. Specifically, the laminate 17 is curved and both ends are overlap-wound to form the annular magnetic core 10 shown in Fig. 4. A known method is used for the overlap-wound method. The shape of the magnetic core 10 is not limited to the shape shown in FIG. 4, and may be any shape.

[0077] Moreover, it is preferable that the amorphous metal ribbons 1 provided in the laminate 17 are insulated from each other. For example, a resin coating can be used for the insulation.

[0078] As described above, the magnetic core 10 includes the aforementioned amorphous metal ribbon 1. This makes it possible to obtain a magnetic core 10 with low core loss and low excitation power even when measured under conditions of high magnetic flux density.

[0079] Such a magnetic core 10 is suitable for use in, for example, transformers, saturable reactors, magnetic switches, and the like.

[0080] While the amorphous metal ribbon, the manufacturing method for the amorphous metal ribbon, and the magnetic core of the present invention have been described above based on the preferred embodiments, the present invention is not limited thereto. EXAMPLES

[0081] Next, specific examples of the present invention will be described. 4. Manufacturing of amorphous metal ribbons Example 1 First, Fe was 82 Si4B 14 The material ribbon was made of amorphous metal having an alloy composition of Fe 25 μm thick and 210 mm wide. 82 Si4B 14 means an alloy composition in which the Fe content is 82 atomic %, the Si content is 4 atomic %, and the B content is 14 atomic %, when the total content of Fe, Si, and B is 100 atomic %.

[0082] Next, a sample piece measuring 120 mm in length and 25 mm in width was cut out from the produced material ribbon.

[0083] Next, one of the main surfaces of the cut sample piece was subjected to laser processing to form laser irradiation marks. At that time, the spot diameter of the laser irradiation marks was adjusted by changing the energy density of the laser light. A row of laser irradiation marks made up of laser irradiation marks was formed across the entire width direction of the material ribbon, as shown in Figure 1. The arrangement conditions of the laser irradiation marks are shown in Table 1. In this way, an amorphous metal ribbon was obtained.

[0084] 4.2. Examples 2 to 33 Except for changing the arrangement conditions of the laser irradiation marks as shown in Table 1 or Table 2, the same procedure as in Example 1 was carried out to obtain an amorphous metal ribbon.

[0085] 4.3. Comparative Examples 1 to 13 Except for changing the arrangement conditions of the laser irradiation marks as shown in Table 1 or Table 2, the same procedure as in Example 1 was carried out to obtain an amorphous metal ribbon.

[0086] 5. Evaluation of amorphous metal ribbons 5.1.Iron Loss For the amorphous metal ribbons obtained in each of the examples and comparative examples, the core loss was measured under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T. The measurement results were evaluated in accordance with the following evaluation criteria.

[0087] A: Iron loss is 0.120W / kg or less B: Core loss is greater than 0.120 W / kg and less than or equal to 0.130 W / kg C: Core loss is greater than 0.130 W / kg and less than 0.140 W / kg D: Core loss is greater than 0.140 W / kg and less than 0.150 W / kg E: Core loss is greater than 0.150W / kg and less than 0.160W / kg F: Core loss is over 0.160W / kg The evaluation results are shown in Tables 1 and 2.

[0088] 5.2.Excitation power For the amorphous metal ribbons obtained in each of the examples and comparative examples, the excitation power was measured under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T. The measurement results were evaluated in accordance with the following evaluation criteria.

[0089] A: Excitation power is 0.135VA / kg or less B: Excitation power is greater than 0.135VA / kg and less than or equal to 0.150VA / kg C: Excitation power is greater than 0.150VA / kg and less than or equal to 0.165VA / kg D: Excitation power is greater than 0.165VA / kg and less than or equal to 0.180VA / kg E: Excitation power is greater than 0.180VA / kg and less than or equal to 0.195VA / kg F: Excitation power is over 0.195VA / kg The evaluation results are shown in Tables 1 and 2.

[0090] [Table 1]

[0091] [Table 2]

[0092] As is clear from Tables 1 and 2, the amorphous metal ribbons obtained in each Example had lower iron loss and excitation power when measured at a relatively high magnetic flux density of 1.45 T, compared to the amorphous metal ribbons obtained in each Comparative Example.

[0093] 5.3.Magnetic Flux Density For the amorphous metal ribbons obtained in each of the Examples and Comparative Examples, the magnetic flux density was measured under conditions of a frequency of 60 Hz and a magnetic field of 7.9557 A / m.

[0094] As a result, the amorphous metal ribbons obtained in the respective Examples all had a magnetic flux density of 1.52 T or more, which was higher than the magnetic flux density of the amorphous metal ribbons obtained in the respective Comparative Examples.

[0095] 5.4. Flexibility The amorphous metal ribbons obtained in each of the examples and comparative examples were evaluated for bending resistance using a cylindrical mandrel testing machine specified in JIS K 5600-5-1. Specifically, the amorphous metal ribbon was bent along a core rod having a diameter of 0.73 mm, and the bending angle was gradually decreased from 180° to 0°. The bending angle at which the ribbon broke was recorded and evaluated according to the following evaluation criteria.

[0096] A: The bending angle at the time of breakage is 30° or less. B: The bending angle at the time of breakage is greater than 30° and less than 60°. C: The bending angle at the time of breakage is greater than 60° and less than 90° D: The bending angle at the time of breakage is greater than 90° and less than or equal to 120°. E: The bending angle at the time of breakage is more than 120° and 150° or less. F: The bending angle at the time of breakage is greater than 150° and less than 180° The evaluation results are shown in Table 1.

[0097] As shown in Table 1, it was confirmed that the amorphous metal ribbons obtained in each Example had a smaller bending angle leading to breakage than the amorphous metal ribbons obtained in each Comparative Example. Therefore, it was confirmed that the amorphous metal ribbons obtained in each Example had excellent bending resistance. Such amorphous metal ribbons contribute to, for example, miniaturization of magnetic cores. [Explanation of symbols]

[0098] 1...amorphous metal ribbon, 10...magnetic core, 11...first surface, 12...second surface, 15...laser irradiation mark, 16...row of laser irradiation marks, 17...laminated body, D1...direction, D2...width direction, D3...thickness direction, S102...material preparation process, S104...laser processing process, d1...line spacing, d2...spot spacing, d3...spot diameter, t1...thickness, L1...length, W1...width

Claims

1. A laser irradiation mark row is formed by a plurality of laser irradiation marks arranged in a row, The distance between adjacent rows of laser irradiation marks is d1, The distance between the laser irradiation marks in the laser irradiation mark row is d2, The diameter of the laser irradiation mark is d3, When the number density D of the laser irradiation marks is (1 / d1) × (1 / d2), The number density D of the laser irradiation marks is 0.05 pieces / mm 2 0.50 pieces / mm or more 2 is as follows: The area occupancy rate A of the laser irradiation mark is D × (d3 / 2) 2 ×π×100, The area occupancy rate A of the laser irradiation mark is 0.0035% or more and 0.040% or less, The coefficient of variation obtained by dividing the standard deviation of the equivalent circle diameter of 100 laser irradiation marks by the average value is 8% or more and 30% or less.

1. An amorphous metal ribbon comprising:

2. The distance d1 between the rows of laser irradiation marks is 10 mm or more and 60 mm or less, The distance d2 between the laser irradiation marks is 0.10 mm or more and 0.50 mm or less, 2. The amorphous metal ribbon according to claim 1, wherein a diameter d3 of the laser irradiation mark is 0.010 mm or more and 0.30 mm or less.

3. 3. The amorphous metal ribbon according to claim 1, having a thickness of 10 μm or more and 50 μm or less.

4. The iron loss under the conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T is 0.150 W / kg or less, 4. The amorphous metal ribbon according to claim 1, wherein an excitation power under conditions of a frequency of 60 Hz and a magnetic flux density of 1.45 T is 0.180 VA / kg or less.

5. A step of preparing a material ribbon having a main surface made of an amorphous metal; A step of performing laser processing on the main surface of the material ribbon to obtain an amorphous metal ribbon having a plurality of laser irradiation mark rows each including a plurality of laser irradiation marks arranged in a row; having The distance between adjacent rows of laser irradiation marks is d1, The distance between the laser irradiation marks in the laser irradiation mark row is d2, The diameter of the laser irradiation mark is d3, When the number density D of the laser irradiation marks is (1 / d1) × (1 / d2), The number density D of the laser irradiation marks is 0.05 pieces / mm 2 0.50 pieces / mm or more 2 is as follows: The area occupancy rate A of the laser irradiation mark is D × (d3 / 2) 2 ×π×100, The area occupancy rate A of the laser irradiation mark is 0.0035% or more and 0.040% or less, The coefficient of variation obtained by dividing the standard deviation of the equivalent circle diameter of 100 laser irradiation marks by the average value is 8% or more and 30% or less.

1. A method for producing an amorphous metal ribbon comprising the steps of:

6. A magnetic core comprising the amorphous metal ribbon according to any one of claims 1 to 4.

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