Fe-BASED AMORPHOUS ALLOY AND THIN Fe-BASED AMORPHOUS ALLOY STRIP

Abstract

This Fe-based amorphous alloy has an amorphous structure and contains, in terms of at%, 8.0-18.0% B, 2.0-9.0% Si, 0.05-0.60% Mn, 78.00-86.00% Fe, 0.006-0.020% S, and 0.0010-0.2000% N, with the remainder being impurities.

Description

Fe-based amorphous alloy and Fe-based amorphous alloy ribbon

[0001] The present invention relates to an Fe-based amorphous alloy and an Fe-based amorphous alloy ribbon, and more particularly to an Fe-based amorphous alloy and an Fe-based amorphous alloy ribbon that are excellent in workability.

[0002] Known methods for continuously producing ribbons or wires by rapidly cooling an alloy from a molten state include the centrifugal quenching method, the single-roll method, and the twin-roll method. These methods produce ribbons or wires by ejecting molten metal from an orifice or other opening onto the inner or outer peripheral surface of a metal drum rotating at high speed, causing the molten metal to rapidly solidify. Furthermore, by appropriately selecting the alloy composition, it is possible to obtain amorphous alloys similar to liquid metals, and to produce materials with excellent magnetic or mechanical properties.

[0003] In particular, Fe-based amorphous alloys have relatively low iron loss and relatively high saturation magnetic flux density compared to non-Fe-based amorphous alloys, and are therefore considered promising for use in the iron cores of power transformers and high-frequency transformers.

[0004] Incidentally, Fe-based amorphous alloys are sometimes obtained as ribbons having a thickness of 0.1 mm or less. In order to use Fe-based amorphous alloy ribbons for iron cores of power transformers, high-frequency transformers, and the like, the ribbons may be bent. However, when Fe-based amorphous alloy ribbons having poor workability are bent, cracks may occur at the bent portion. Therefore, in order to improve the yield when the ribbons are processed into iron cores, etc., the Fe-based amorphous alloy ribbons are required to have excellent workability.

[0005] Patent Document 1 describes an Fe-B-Si-C amorphous alloy ribbon having Fe as a base element and B, Si, and C as alloy constituent elements, and further having the following contents of impurities: P: 0.008% or more and 0.1% or less, Mn: 0.15% or more and 0.5% or less, and S: 0.004% or more and 0.05% or less, in weight percent.

[0006] Patent Document 2 describes an Fe-based amorphous alloy ribbon containing, in atomic %, B: 5 to 25%, Si: 1 to 30%, N: 0.001 to 0.2%, with the balance being Fe and unavoidable impurities.

[0007] Patent Document 3 describes an amorphous alloy ribbon containing Fe, Si, B, C, Mn, S, and inevitable impurities, and having a composition in which, when the total amount of Fe, Si, B, and C is taken as 100.0 atomic %, Si is 3.0 atomic % or more and 10.0 atomic % or less, B is 10.0 atomic % or more and 15.0 atomic % or less, and C is 0.2 atomic % or more and 0.4 atomic % or less, the Mn content is more than 0.12 mass % and less than 0.15 mass %, the S content is more than 0.0034 mass % and less than 0.0045 mass %, and the thickness is 10 μm or more and 40 μm or less and the width is 100 mm or more and 300 mm or less.

[0008] In Patent Document 1, it is stated that by using B, Si, and C as alloy constituent elements and specifying the contents of P, Mn, and S elements, it becomes possible to use low-grade materials and to reduce the alloy cost when producing the ribbon, but no consideration is given to improving the workability (bending fracture diameter).

[0009] Patent Document 2 describes that by adding N to Fe-B-Si and Fe-B-Si-C amorphous alloys, impurity elements (such as Al), which are said to promote crystallization, are concentrated in the surface oxide layer, thereby preventing crack propagation in the amorphous alloy ribbon and significantly improving workability, and also describes that the effect of adding N reduces the bending fracture diameter by about 40% in both cases, improving brittleness. However, there is no description about adding S (sulfur).

[0010] Patent Document 3 describes that in an Fe-B-Si-C amorphous alloy ribbon, the Mn and S contents are adjusted to allow molten metal to be continuously discharged from a discharge nozzle over a long period of time, but does not consider at all how to improve workability (bending fracture diameter).

[0011] Japanese Patent Application Publication No. 9-95760 Japanese Patent Application Publication No. 2006-316348 International Publication No. 2016 / 084741

[0012] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an Fe-based amorphous alloy and an Fe-based amorphous alloy ribbon that are excellent in workability.

[0013] In order to solve the above problems, the present invention employs the following configuration. [1] An Fe-based amorphous alloy containing, in atomic percent, B: 8.0% to 18.0%, Si: 2.0% to 9.0%, Mn: 0.05% to 0.60%, Fe: 78.00% to 86.00%, S: 0.006% to 0.020%, N: 0.0010% to 0.2000%, with the balance consisting of impurities, and having an amorphous structure. [2] An Fe-based amorphous alloy according to [1], in which B is 13.0 atomic percent to 18.0 atomic percent. [3] An Fe-based amorphous alloy according to [1], in which Si is 2.0 atomic percent to 6.0 atomic percent. [4] An Fe-based amorphous alloy according to [2], in which Si is 2.0 atomic percent to 6.0 atomic percent. [5] The Fe-based amorphous alloy according to [1], wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less. [6] The Fe-based amorphous alloy according to [2], wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less. [7] The Fe-based amorphous alloy according to [3], wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less. [8] The Fe-based amorphous alloy according to [4], wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less. [9] The Fe-based amorphous alloy according to [1], wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

[10] The Fe-based amorphous alloy according to [2], wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

[11] The Fe-based amorphous alloy according to [3], wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

[12] The Fe-based amorphous alloy according to [4], wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

[13] The Fe-based amorphous alloy according to any one of [1] to

[12] , wherein Fe is substituted with at least one element selected from Ni, Cr, and Co in the range of 10.0 atomic % or less.

[14] The iron loss W when magnetized at a frequency of 50 Hz and a magnetic flux density of 1.3 T. １3／５０The Fe-based amorphous alloy according to any one of [1] to

[12] , wherein the iron loss W when magnetized at a frequency of 50 Hz and a magnetic flux density of 1.3 T is 0.100 W / kg or less and a saturation magnetic flux density is 1.60 T or more. １3／５０

[16] An Fe-based amorphous alloy ribbon made of the Fe-based amorphous alloy according to any one of [1] to

[12] .

[17] An Fe-based amorphous alloy ribbon according to

[16] , in which Fe is substituted with at least one element selected from Ni, Cr, and Co in an amount of 10.0 atomic % or less.

[18] An Fe-based amorphous alloy ribbon having an iron loss W when magnetized at a frequency of 50 Hz and a magnetic flux density of 1.3 T. １3／５０ The Fe-based amorphous alloy ribbon according to

[16] , having a bending fracture diameter of 4 mm or less, and a saturation magnetic flux density of 1.60 T or more.

[19] The Fe-based amorphous alloy ribbon according to

[16] , having a bending fracture diameter of 4 mm or less.

[0014] According to the present invention, it is possible to provide an Fe-based amorphous alloy and an Fe-based amorphous alloy ribbon that are excellent in workability.

[0015] The present inventors have found that an Fe-based amorphous alloy having excellent workability, with a bending fracture diameter of 4 mm or less, can be obtained while improving amorphous-forming ability by controlling the content of S, an element that deteriorates brittleness, and adjusting the contents of amorphous-forming elements such as B, Si, and N. Furthermore, they have found that by adding Mn in the range of 0.05 atomic % to 0.60 atomic %, it is possible to achieve both excellent soft magnetic properties and workability.

[0016] Hereinafter, an Fe-based amorphous alloy and an Fe-based amorphous alloy ribbon according to embodiments of the present invention will be described.

[0017] In this embodiment, "excellent processability" means that when the Fe-based amorphous alloy is made into a ribbon, the bending fracture diameter is small, and "excellent soft magnetic properties" means that the alloy has low iron loss and high saturation magnetic flux density.

[0018] The Fe-based amorphous alloy of this embodiment contains, in atomic %, B: 8.0% to 18.0%, Si: 2.0% to 9.0%, Mn: 0.05% to 0.60%, Fe: 78.00% to 86.00%, S: 0.006% to 0.020%, N: 0.0010% to 0.2000%, with the remainder being impurities, and has an amorphous structure.

[0019] The Fe-based amorphous alloy of this embodiment may also contain 13.0 atomic % or more and 18.0 atomic % or less of B. The Fe-based amorphous alloy of this embodiment may also contain 2.0 atomic % or more and 6.0 atomic % or less of Si.

[0020] Furthermore, when the Fe-based amorphous alloy of this embodiment contains S and N, the ratio of the amount of N to the amount of S (N / S) may be 0.20 or more and 15 or less. Furthermore, in the Fe-based amorphous alloy of this embodiment, Fe may be substituted with at least one element selected from Ni, Cr, and Co in a range of 10.0 atomic % or less. Furthermore, the Fe-based amorphous alloy ribbon of this embodiment is made of the above-mentioned Fe-based amorphous alloy.

[0021] First, the reasons for limiting the content of each element in the Fe-based amorphous alloy of this embodiment will be described.

[0022] B is included in the Fe-based amorphous alloy of this embodiment to improve the formation of an amorphous phase and the thermal stability of the amorphous phase. By optimizing the content of this element, the alloy structure can be stably amorphous, further improving soft magnetic properties. For example, the saturation magnetic flux density can be stably 1.60 T or higher. If the B content is less than 8.0 atomic %, the amorphous phase formation ability is not improved, and the amorphous alloy cannot be stably obtained in the Fe-based amorphous alloy. This makes it difficult to stably achieve a saturation magnetic flux density of 1.60 T or higher while maintaining a stable iron loss of 0.100 W / kg or lower. On the other hand, if the B content exceeds 18.0 atomic %, the amorphous phase formation ability is not improved, and it becomes difficult to stably achieve a saturation magnetic flux density of 1.60 T or higher. Therefore, the B content is set to 8.0 atomic % or higher and 18.0 atomic % or lower. The lower limit of B is preferably 10.0 atomic %, more preferably 13.0 atomic %. The upper limit of B is preferably 16.0 atomic %, and more preferably 15.0 atomic %.

[0023] Like B, Si is included in the Fe-based amorphous alloy of this embodiment to improve the amorphous phase formation and thermal stability of the amorphous phase. By optimizing the Si content, the alloy structure can be stably amorphous, thereby further improving soft magnetic properties. If the Si content is less than 2.0 atomic %, the amorphous phase formation ability is not improved, and the amorphous alloy cannot be stably obtained in the Fe-based amorphous alloy. This makes it difficult to stably maintain the saturation magnetic flux density at 1.60 T or more while maintaining the iron loss at 0.100 W / kg or less. On the other hand, if the Si content exceeds 9.0 atomic %, the amorphous phase formation ability is not improved, and it becomes difficult to stably maintain the iron loss at 0.100 W / kg or less. Therefore, the Si content is set to 2.0 atomic % or more and 9.0 atomic % or less. The lower limit of Si is preferably 3.0 atomic %, more preferably 4.0 atomic %. The upper limit of Si is preferably 6.0 atomic %, more preferably 5.0 atomic %, and particularly preferably less than 5.0 atomic %.

[0024] Mn is added to the Fe-based amorphous alloy of this embodiment to improve its soft magnetic properties. By optimizing the Mn content, for example, it becomes possible to stably maintain the saturation magnetic flux density at 1.60 T or more while stably maintaining the core loss at 0.100 W / kg or less. If the Mn content is less than 0.05 atomic %, it becomes difficult to stably maintain the saturation magnetic flux density at 1.60 T or more while stably maintaining the core loss at 0.100 W / kg or less. On the other hand, if the Mn content exceeds 0.60 atomic %, it becomes difficult to stably maintain the core loss at 0.100 W / kg or less. Therefore, the Mn content is set to 0.05 atomic % or more and 0.60 atomic % or less. The lower limit of Mn is preferably 0.10 atomic %, more preferably 0.20 atomic %. The upper limit of Mn is preferably 0.50 atomic %, more preferably 0.40 atomic %.

[0025] In Fe-based amorphous alloys, if the Fe content is 70 atomic % or more, a saturation magnetic flux density at a practical level for a general iron core can be obtained, but in order to obtain a high saturation magnetic flux density of 1.60 T or more, the Fe content must be 78.00 atomic % or more. On the other hand, if the Fe content exceeds 86.00 atomic %, it becomes difficult to form an amorphous phase, and the good soft magnetic properties (iron loss W) specific to amorphous alloys are lost. １３／５０ It becomes difficult to stably obtain a tensile strength (a value of 0.100 W / kg or less). Therefore, in the Fe-based amorphous alloy of this embodiment, the Fe content is set to 78.00 atomic % or more and 86.00 atomic % or less. The lower limit of Fe is preferably 79.00 atomic %, more preferably 80.00 atomic %. The upper limit of Fe is preferably 85.00 atomic %, more preferably 84.00 atomic %.

[0026] In the Fe-based amorphous alloy of this embodiment, by replacing a portion of Fe with at least one of Ni, Cr, and Co in a range of 10.0 atomic % or less, it is possible to improve soft magnetic properties such as iron loss while maintaining a high saturation magnetic flux density. The reason for setting an upper limit on the amount of substitution by these elements is that if the amount exceeds 10.0 atomic %, the saturation magnetic flux density will decrease and the raw material cost will increase. When Fe is replaced by one or more of Ni, Cr, and Co, the total content of Ni, Cr, and Co and the Fe content may be 78.00 atomic % or more and 86.00 atomic % or less, or may be 79.00 atomic % or more and 84.00 atomic % or less.

[0027] Furthermore, the Fe-based amorphous alloy of this embodiment must contain, in atomic percent, S: 0.006% to 0.020% and N: 0.0010% to 0.2000%.

[0028] S is an element that deteriorates the brittleness of the Fe-based amorphous alloy of this embodiment. By optimizing the S content, it is possible to make the bending fracture diameter of the Fe-based amorphous alloy ribbon 4 mm or less. Therefore, the S content is set to 0.006 atomic % or more and 0.020 atomic % or less. The upper limit of S is preferably 0.016 atomic %, more preferably 0.014 atomic %, and even more preferably 0.010 atomic % or less.

[0029] N is contained in the Fe-based amorphous alloy of this embodiment to improve amorphous-forming ability and workability. Optimizing the N content makes it possible to reduce the bending fracture diameter of the Fe-based amorphous alloy ribbon to 4 mm or less. If the N content is less than 0.0010 atomic %, the effect of improving workability cannot be obtained. On the other hand, if the N content exceeds 0.2000 atomic %, the effect of amorphous-forming ability saturates, and iron loss may increase. Therefore, the N content is set to 0.0010 atomic % or more and 0.2000 atomic % or less. Preferably, the N content is set to 0.0020 atomic % or more. More preferably, the N content is set to 0.0030 atomic % or more. Preferably, the N content is set to 0.1500 atomic % or less. More preferably, the N content is set to 0.1000 atomic % or less.

[0030] When the Fe-based amorphous alloy of this embodiment contains S and N, the ratio of the amount of N to the amount of S (atomic ratio) (N / S) may be 0.20 or more and 15 or less. By setting the ratio of the amount of S to the amount of N (N / S) to 0.20 or more and 15 or less, the processability can be further improved. In addition, the soft magnetic properties can also be improved. The lower limit of (N / S) may be 0.40, or even 0.60. The upper limit of (N / S) may be 13, or even 11.

[0031] The remainder in the Fe-based amorphous alloy according to this embodiment is impurities. For example, when a steel material is used as the Fe source, the Fe-based amorphous alloy according to this embodiment may contain impurity elements contained in the steel material as impurities. For example, the alloy may contain impurities such as C, P, Al, Ti, and O in a total amount of less than 0.10 atomic %. The approximate amounts of each element contained as an impurity are C less than 0.03 atomic %, P less than 0.01 atomic %, Al less than 0.01 atomic %, Ti less than 0.005 atomic %, and O less than 0.04 atomic %.

[0032] The Fe-based amorphous alloy of this embodiment has an amorphous structure. This allows for excellent soft magnetic properties to be obtained. Whether or not the alloy has an amorphous structure can be confirmed, for example, by X-ray diffraction measurement using an X-ray diffractometer with a Co tube. That is, if no clear diffraction peak is obtained in the X-ray diffraction measurement, it can be confirmed that the Fe-based amorphous alloy has an amorphous structure. Here, "no clear diffraction peak is obtained in the X-ray diffraction measurement" means that there is no peak with a half-width (full width at half maximum) of 4° or less of the α-Fe(110) diffraction peak.

[0033] When the saturation magnetic flux density and iron loss of the Fe-based amorphous alloy and Fe-based amorphous alloy ribbon of this embodiment are measured by the method described below, the saturation magnetic flux density is 1.60 T or more, the magnetic flux density is 1.3 T, and the iron loss (iron loss W １３／５０ ) is preferably 0.100 W / kg or less. This allows the Fe-based amorphous alloy and the Fe-based amorphous alloy ribbon of this embodiment to have excellent soft magnetic properties.

[0034] Iron loss is measured using an SST (Single Strip Tester). The iron loss measurement conditions are a magnetic flux density of 1.3 T and a frequency of 50 Hz. Samples for iron loss measurement are collected from six locations along the entire length of one lot of ribbon. The samples for iron loss measurement are ribbon samples cut to a length of 120 mm. These ribbon samples for iron loss measurement are annealed at 360°C for one hour in a magnetic field (magnetic field: 800 A / m, magnetic field applied in the casting direction) and then used for measurement. The atmosphere during annealing is a nitrogen atmosphere. Meanwhile, saturation magnetic flux density is measured using a VSM (Vibrating Sample Magnetometer) device. The samples for the VSM device are thin sections collected from the width center of each of the ribbon samples from the six locations.

[0035] Furthermore, the Fe-based amorphous alloy ribbon of this embodiment can have a bending fracture diameter of 4 mm or less. The bending fracture diameter can be obtained in accordance with the bending test method for metallic materials of JIS Z 2248: 2006, by placing a ribbon made of an Fe-based amorphous alloy in a bending tester, pressing both ends of the test piece together until they come into close contact, and measuring the diameter of the test piece at fracture (bending fracture diameter).

[0036] The Fe-based amorphous alloy and the method for producing the Fe-based amorphous alloy ribbon according to this embodiment will be described below. The Fe-based amorphous alloy according to this embodiment can usually be obtained in the form of a ribbon. This Fe-based amorphous alloy ribbon can be produced by melting an alloy consisting of the components described in the above embodiment, ejecting the molten metal through a slot nozzle or the like onto a cooling plate moving at high speed, and rapidly solidifying the molten metal, for example, by a single-roll method or a twin-roll method. The rolls used in these roll methods are made of metal, and the alloy can be rapidly solidified by rotating the rolls at high speed and causing the molten metal to collide with the surface or inner surface of the roll.

[0037] Single-roll equipment includes centrifugal quenching equipment that uses the inner wall of a drum, equipment that uses an endless belt, and improved versions of these, such as auxiliary rolls and equipment equipped with roll surface temperature control devices, as well as casting equipment that operates under reduced pressure, in a vacuum, or in an inert gas.

[0038] In this embodiment, the dimensions of the ribbon, such as the thickness and width, are not particularly limited, but the ribbon thickness is preferably, for example, 10 μm or more and 100 μm or less. The ribbon width is preferably 10 mm or more. The Fe-based amorphous alloy ribbon obtained as described above can be used for applications such as iron cores in power transformers and high-frequency transformers.

[0039] The Fe-based amorphous alloy of this embodiment can also be in the form of a powder, in addition to a ribbon. To obtain a powdered Fe-based amorphous alloy, a method can be employed in which the molten alloy or droplets of the molten alloy are ejected at high speed from the nozzle of a crucible filled with the molten alloy of the above composition into a rotating roll or a liquid such as cooling water, thereby causing rapid solidification.

[0040] By the above-mentioned method, it is possible to obtain an Fe-based amorphous alloy powder having excellent soft magnetic properties.

[0041] The Fe-based soft magnetic alloy powder obtained as described above can be compacted in a mold or the like to form a desired shape, and if necessary, sintered to form an integrated body, and can be used for applications such as power transformers, high-frequency transformers, and coil cores.

[0042] As described above, according to the Fe-based amorphous alloy and Fe-based amorphous alloy ribbon of the present embodiment, the workability can be improved by optimizing the contents of B and Si, adding an appropriate amount of Mn, further adding S and N, and further setting the Fe content to 78.00% or more.

[0043] In addition, in the Fe-based amorphous alloy and the Fe-based amorphous alloy ribbon of this embodiment, the iron loss (iron loss W １３／５０ ) is preferably 0.100 W / kg or less, and the saturation magnetic flux density is preferably 1.60 T or more. As a result, the Fe-based amorphous alloy and the Fe-based amorphous alloy ribbon of the present embodiment can exhibit excellent soft magnetic properties. As a result, they can be suitably used for iron cores of power transformers, high-frequency transformers, etc.

[0044] Furthermore, the Fe-based amorphous alloy ribbon of this embodiment can have a bending fracture diameter of 4 mm or less, which means that when the Fe-based amorphous alloy ribbon is processed into iron cores of power transformers, high-frequency transformers, etc., there is no risk of the alloy ribbon being broken, and the productivity of iron cores of power transformers and high-frequency transformers can be improved. The bending fracture diameter of the Fe-based amorphous alloy ribbon of this embodiment is more preferably 2 mm or less.

[0045] Examples of the present invention will be described below.

[0046] Example 1: An Fe-based amorphous alloy ribbon was produced by melting alloys of the various compositions shown in Tables 1A and 1B in an argon atmosphere, quenching them in a single-roll apparatus, and casting them. The casting atmosphere was air. The single-roll apparatus used consisted of a copper alloy cooling roll with a diameter of 300 mm, a high-frequency power source for melting the sample, and a quartz crucible with a slot nozzle attached to its tip. In this experiment, a slot nozzle with a length of 10 mm and a width of 0.6 mm was used. The peripheral speed of the cooling roll was 24 m / s. As a result, the thickness of the obtained ribbon was approximately 20 μm, the width was 10 mm (depending on the length of the slot nozzle), and the length was approximately 100 m.

[0047] The obtained Fe-based amorphous alloy ribbon was subjected to X-ray diffraction measurement to obtain an X-ray diffraction pattern. The X-ray source for the X-ray diffraction measurement was Co—Kα (wavelength λ=0.17902 nm), and the scan range was 2θ=10° to 120°. Whether a crystalline phase was formed in the metal structure was determined from the shape of the X-ray diffraction pattern.

[0048] The saturation magnetic flux density and iron loss of the Fe-based amorphous alloy ribbon were measured using an SST (Single Strip Tester). The iron loss measurement conditions were a magnetic flux density of 1.3 T and a frequency of 50 Hz. The samples for iron loss measurement were collected from six locations across the entire length of one lot of ribbon. The samples for iron loss measurement were ribbon samples cut to a length of 120 mm. These ribbon samples for iron loss measurement were annealed at 360°C for one hour in a magnetic field (magnetic field: 800 A / m, applied in the casting direction) and then used for measurement. The atmosphere during annealing was a nitrogen atmosphere. Meanwhile, the samples for the VSM device were thin sections collected from the width center of each of the ribbon samples from the six locations.

[0049] The saturation magnetic flux density and iron loss measurements were taken at six locations and the average values ​​are shown in Tables 1A and 1B.

[0050] Furthermore, the bending fracture diameter of the Fe-based amorphous alloy ribbon was measured. The bending fracture diameter was measured in accordance with JIS Z 2248:2006, a bending test method for metal materials, in which the Fe-based amorphous alloy ribbon was placed in a bending tester, and the bending fracture diameter at break was measured. The results are shown in Table 1A and Table 1B.

[0051]

[0052]

[0053] As shown in Table 1A, in all of Inventive Examples 1 to 22, the alloy composition satisfied the range of the present invention, and therefore the saturation magnetic flux density was 1.60 T or more, and the iron loss (iron loss W １３／５０ ) was 0.100 W / kg or less, and it was possible to simultaneously exhibit high saturation magnetic flux density and low iron loss. In addition, the bending fracture diameter was 4 mm or less, and workability was also good.

[0054] On the other hand, as shown in Table 1B, in Comparative Examples 101 to 113, the alloy composition did not satisfy the range of the present invention, and therefore the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg or the saturation magnetic flux density became less than 1.60 T.

[0055] That is, in Comparative Example 101, the Fe content was low, and the saturation magnetic flux density was less than 1.60 T. In Comparative Example 102, the Fe content was excessive, and the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg.

[0056] Comparative Example 103 has a low B content and low iron loss (iron loss W １３／５０ In Comparative Example 104, the B content was excessive, and the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg.

[0057] Comparative Example 105 has a low Si content and low iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg. In Comparative Example 106, the Si content was excessive, and the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg.

[0058] Comparative Example 107 has a low Mn content and low iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg. In Comparative Example 108, the Mn content was excessive, and the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg.

[0059] In Comparative Example 109, the S content was excessive, and the bending fracture diameter exceeded 4 mm. １３／５０ ) exceeded 0.100 W / kg.

[0060] In Comparative Example 110, the N content was low and the bending fracture diameter exceeded 4 mm. １３／５０ ) exceeded 0.100 W / kg. In Comparative Example 111, the N content was excessive, and the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg.

[0061] In Comparative Example 112, the S content was excessive, and the bending fracture diameter exceeded 4 mm. １３／５０ ) exceeded 0.100 W / kg. In Comparative Example 113, the N content was excessive, and the iron loss (iron loss W １３／５０ ) exceeded 0.100 W / kg.

[0062] In addition, when X-ray diffraction measurement was performed on the Fe-based amorphous alloy ribbon, no clear diffraction peak was observed in any of Inventive Examples 1 to 22 and Comparative Examples 101 to 113, so it cannot be said that a crystalline phase was generated in the metal structure, and the entire structure was an amorphous phase.

[0063] (Example 2) For each of the alloys shown in No. 1 in Table 1A, alloys of various compositions in which part of the Fe was replaced with at least one of Ni, Cr, and Co were used to cast ribbons using the same equipment and conditions as in Example 1. The specific compositions of the alloys used are shown in Table 2. As a result, the thickness, width, and length of the obtained ribbons were approximately 20 μm, 10 mm, and approximately 100 m, respectively. The saturation magnetic flux density, core loss, and bending fracture diameter of the obtained ribbons were evaluated. The sample collection method and measurement conditions used for these property evaluations were the same as in Example 1. The measurement results are shown in Table 2. The presentation methods in Table 2 are the same as those in Tables 1A and 1B.

[0064]

[0065] As is clear from the results of samples No. 23 to 29 in Table 2, even if a part of Fe is replaced with at least one of Ni, Cr, and Co in the range of 10.0 atomic % or less, the saturation magnetic flux density is 1.60 T or more, and the iron loss is W １３／５０ It was found that the bending fracture diameter was 4 mm or less, and the workability was also good. Furthermore, no clear diffraction peaks were observed in X-ray diffraction measurements of any of the samples, confirming that they were amorphous.

[0066] As is clear from the above examples, it has become clear that the iron loss (iron loss W) at a magnetic flux density of 1.3 T and a frequency of 50 Hz can be improved by optimizing the contents of B and Si, adding an appropriate amount of Mn, further adding S and N, and further setting the Fe content to 78.00% or more in the Fe-based amorphous alloy of the present invention. １３／５０ ) is 0.100 W / kg or less, the saturation magnetic flux density is 1.60 T or more, and it has become clear that excellent soft magnetic properties can be exhibited and that the material can be suitably used for the iron cores of power transformers and high-frequency transformers.

[0067] It has also been found that the Fe-based amorphous alloy ribbon of the present invention has a bending fracture diameter of 4 mm or less. １３／５０ It was also revealed that the magnetic flux density was 0.100 W / kg or less and the saturation magnetic flux density was 1.60 T or more. This means that when the Fe-based amorphous alloy ribbon is processed into iron cores of power transformers, high-frequency transformers, etc., there is no risk of the alloy ribbon being damaged, and it is possible to improve the productivity of iron cores of power transformers and high-frequency transformers.

[0068] The Fe-based amorphous alloy and Fe-based amorphous alloy ribbon of the present disclosure have excellent workability and therefore have high industrial applicability.

Claims

1. An Fe-based amorphous alloy containing, in atomic percent, B: 8.0% or more and 18.0% or less, Si: 2.0% or more and 9.0% or less, Mn: 0.05% or more and 0.60% or less, Fe: 78.00% or more and 86.00% or less, S: 0.006% or more and 0.020% or less, N: 0.0010% or more and 0.2000% or less, the remainder being impurities, and having an amorphous structure.

2. The Fe-based amorphous alloy according to claim 1, wherein B is 13.0 atomic % or more and 18.0 atomic % or less.

3. The Fe-based amorphous alloy according to claim 1, wherein Si is 2.0 atomic % or more and 6.0 atomic % or less.

4. An Fe-based amorphous alloy according to claim 2, wherein Si is 2.0 atomic % or more and 6.0 atomic % or less.

5. An Fe-based amorphous alloy according to claim 1, wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less.

6. An Fe-based amorphous alloy according to claim 2, wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less.

7. An Fe-based amorphous alloy according to claim 3, wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less.

8. An Fe-based amorphous alloy according to claim 4, wherein N is 0.0030 atomic % or more and 0.2000 atomic % or less.

9. The Fe-based amorphous alloy according to claim 1, wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

10. An Fe-based amorphous alloy according to claim 2, wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

11. The Fe-based amorphous alloy according to claim 3, wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

12. The Fe-based amorphous alloy according to claim 4, wherein the ratio of the amount of N to the amount of S (N / S) is 0.20 or more and 15 or less.

13. An Fe-based amorphous alloy according to any one of claims 1 to 12, wherein Fe is substituted with at least one element selected from the group consisting of Ni, Cr, and Co in an amount of 10.0 atomic % or less.

14. Iron loss W when magnetized at a frequency of 50 Hz and a magnetic flux density of 1.3 T １3／５０ 13. The Fe-based amorphous alloy according to claim 1, wherein the magnetic flux density is 0.100 W / kg or less and the saturation magnetic flux density is 1.60 T or more.

15. Iron loss W when magnetized at a frequency of 50 Hz and a magnetic flux density of 1.3 T １3／５０ The Fe-based amorphous alloy according to claim 13, wherein the magnetic flux density is 0.100 W / kg or less and the saturation magnetic flux density is 1.60 T or more.

16. An Fe-based amorphous alloy ribbon comprising the Fe-based amorphous alloy according to any one of claims 1 to 12.

17. An Fe-based amorphous alloy ribbon according to claim 16, wherein Fe is substituted with at least one element selected from the group consisting of Ni, Cr, and Co in an amount of 10.0 atomic % or less.

18. Iron loss W when magnetized at a frequency of 50 Hz and a magnetic flux density of 1.3 T １3／５０ The Fe-based amorphous alloy ribbon according to claim 16, wherein the magnetic flux density is 0.100 W / kg or less and the saturation magnetic flux density is 1.60 T or more.

19. The Fe-based amorphous alloy ribbon according to claim 16, having a bending fracture diameter of 4 mm or less.

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