Nanocrystalline alloy strips and magnetic sheets

Abstract

To provide nanocrystalline alloy thin strips and magnetic sheets that have a high saturation magnetic flux density and can suppress losses. [Solution] The nanocrystalline alloy thin strip is represented by the following formula (1). The magnetic flux density of the nanocrystalline alloy thin strip is 1.30 T or more when a magnetic field of 800 A / m is applied. The iron loss of the nanocrystalline alloy thin strip is 500 kW / m when a magnetic field of 100 kHz and a magnetic flux density of 0.2 T is applied. 3 The following is the formula: Equation (1) Fe 100-a-b-c-d-e X a -Si b -B c -Cu d -M e (In formula (1) above, the units of a, b, c, d, and e are atomic percent. X is at least one element selected from Ni and Co. M is at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The values ​​of a, b, c, d, and e are as follows: 0.0 ≤ a ≤ 3.0, 11.0 ≤ b ≤ 16.0, 5.0 ≤ c ≤ 9.0, 0 ≤ d ≤ 1.5, 1.5 ≤ e ≤ 3.0).

Description

[Technical Field]

[0001] This disclosure relates to nanocrystalline alloy strips and magnetic sheets. [Background technology]

[0002] Contactless charging is performed by a power supply device and a power receiving device. The power supply device is, for example, a charger. The power supply device is, for example, installed on the roadside. The power receiving device is, for example, installed in a vehicle. The power supply device and the power receiving device each include a coil and a magnetic sheet.

[0003] In both the power supply and power receiving devices, the magnetic sheet is placed behind the coil. The magnetic sheet improves charging efficiency by functioning as a yoke. In addition, the magnetic sheet suppresses magnetic influence on surrounding components by functioning as a magnetic shield.

[0004] Magnetic sheets contain magnetic materials. Examples of magnetic materials include ferrite, amorphous alloys, and nanocrystalline alloy strips. Nanocrystalline alloy strips have high relative permeability and saturation magnetic flux density. Furthermore, nanocrystalline alloy strips can be made thinner. Nanocrystalline alloy strips are disclosed in Patent Document 1. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2008-196006 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In the future, faster charging will be required for contactless charging. To achieve faster charging, it is necessary to increase the current flowing through the coil in the power supply device and increase the magnetic flux density in the coil in the power receiving device. If the magnetic sheet in the power receiving device contains a nanocrystalline alloy thin strip, the nanocrystalline alloy thin strip needs to have an even higher saturation magnetic flux density to correspond to the increase in magnetic flux density in the coil in the power receiving device. In addition, to maintain power supply efficiency, the loss of the nanocrystalline alloy thin strip must be suppressed.

[0007] In one aspect of this disclosure, it is preferable to provide nanocrystalline alloy strips and magnetic sheets that have a high saturation magnetic flux density and can suppress losses. [Means for solving the problem]

[0008] One aspect of this disclosure is a composition represented by the following formula (1), with a magnetic flux density of 1.30 T or more when a magnetic field of 800 A / m is applied, and an iron loss of 500 kW / m when a magnetic field of 100 kHz and a magnetic flux density of 0.2 T is applied. 3 The following is a nanocrystalline alloy thin strip.

[0009] Equation (1) Fe 100-a-b-c-d-e X a -Si b -B c -Cu d -M e (In formula (1) above, the units of a, b, c, d, and e are atomic percent. X is at least one element selected from Ni and Co. M is at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The values ​​of a, b, c, d, and e are as follows: 0.0 ≤ a ≤ 3.0, 11.0 ≤ b ≤ 16.0, 5.0 ≤ c ≤ 9.0, 0 ≤ d ≤ 1.5, 1.5 ≤ e ≤ 3.0). One aspect of this disclosure, the nanocrystalline alloy thin band, has a high saturation magnetic flux density and can suppress losses. [Brief explanation of the drawing]

[0010] [Figure 1]It is a side sectional view showing the configuration of the magnetic sheet. [Figure 2] It is a side sectional view showing the configuration of the unit unit. [Figure 3] It is a side sectional view showing the configuration of the unit unit including the nanocrystalline alloy ribbon with cracks.

Mode for Carrying Out the Invention

[0011] Exemplary embodiments of the present disclosure will be described with reference to the drawings. <First Embodiment> 1. Configuration of Nanocrystalline Alloy Ribbon The composition of the nanocrystalline alloy ribbon of the present disclosure is represented by the following formula (1).

[0012] Formula (1) Fe 100-a-b-c-d-e X a -Si b -B c -Cu d -M e (In the above formula (1), the units of a, b, c, d, and e are atomic %. X is at least one element selected from Ni and Co. M is at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The values of a, b, c, d, and e are as follows. 0.0≦a≦3.0, 11.0≦b≦16.0, 5.0≦c≦9.0, 0≦d≦1.5, 1.5≦e≦3.0).

[0013] The magnetic flux density of the nanocrystalline alloy ribbon when a magnetic field of 800 A / m is applied is 1.30 T or more, and preferably 1.35 T or more. The magnetic flux density of the nanocrystalline alloy ribbon when a magnetic field of 800 A / m is applied is larger as the mass concentration of Fe in the alloy is higher.

[0014] The iron loss of the nanocrystalline alloy ribbon when a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied is 500 kW / m 3 or less, and 450 kW / m 3The following is preferable: When a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied, the iron loss of the nanocrystalline alloy thin strip is smaller as b increases within the range of 11.0 to 16.0. When b is 16.0 or less, crystallization is difficult and hysteresis is small.

[0015] When the value of e is between 1.5 and 3.0, the average grain size becomes smaller compared to when the value of e is less than 1.5. When the value of e is between 1.5 and 3.0, the mass concentration of Fe in the alloy can be increased compared to when the value of e is greater than 3.0, and the magnetic flux density of the nanocrystalline alloy thin strip can be increased. For example, M contains Nb, and e is between 2.0 and 2.5. When e is 2.0 or higher, the precipitation of Fe-B, which causes grain coarsening and deterioration of magnetic properties, can be suppressed. When M contains Nb and e is 2.5 or lower, the mass concentration of Fe in the alloy can be increased, and the oxidation of part of the molten metal during casting, which clogs the nozzle, can be suppressed. Since Nb is easily oxidized, including Nb can suppress the oxidation of part of the molten metal. For example, the Si / Fe ratio, which is the ratio of the number of Si atoms to the number of Fe atoms, is 0.2 or less. When the Si / Fe ratio is 0.2 or less, the amount of Si is low, and surface crystallization is less likely to occur. As a result, coarse crystal grains are less likely to form after heat treatment, and the soft magnetic properties are less likely to deteriorate.

[0016] The thickness of the nanocrystalline alloy strip is preferably 20 μm or less, and more preferably 18 μm or less. When the thickness of the nanocrystalline alloy strip is 20 μm or less, the loss is even smaller. When the thickness of the nanocrystalline alloy strip is 18 μm or less, the loss is particularly small.

[0017] The thickness of the nanocrystalline alloy strip is preferably 12 μm or more, and more preferably 14 μm or more. When the thickness of the nanocrystalline alloy strip is 12 μm or more, the number of layers of nanocrystalline alloy strips constituting the magnetic sheet 1 described later can be suppressed. When the thickness of the nanocrystalline alloy strip is 14 μm or more, the number of layers of nanocrystalline alloy strips constituting the magnetic sheet 1 can be suppressed even further.

[0018] The absolute value of the magnetostriction of the nanocrystalline alloy thin strip is preferably 4.0 ppm or less, and more preferably 3.0 ppm or less. The absolute value of the magnetostriction of the nanocrystalline alloy thin strip is smaller as the value of b increases, within the range of 11.0 to 16.0.

[0019] The relative permeability of a nanocrystalline alloy thin strip when a magnetic field of 100 kHz is applied is preferably between 5000 and 50000, and more preferably between 8000 and 40000. The relative permeability of a nanocrystalline alloy thin strip when a magnetic field of 100 kHz is applied is smaller as the average grain size increases.

[0020] The Q-factor of a nanocrystalline alloy thin strip when a magnetic field of 100 kHz is applied is preferably 0.5 or higher. The Q-factor of a nanocrystalline alloy thin strip when a magnetic field of 100 kHz is applied is higher as the relative permeability increases.

[0021] In the composition of the nanocrystalline alloy thin strip, the value of (100-abcde) / b is preferably between 14 and 22. In this case, the loss of the nanocrystalline alloy thin strip is further reduced.

[0022] The nanocrystalline alloy strips of this disclosure can be used, for example, in a magnetic sheet 1 shown in Figure 1. The magnetic sheet 1 is provided, for example, in a power supply device, a power receiving device, or both devices in a contactless charging system. The magnetic sheet 1 is provided, for example, behind a coil in a power supply device, a power receiving device, or both devices. The magnetic sheet 1 functions, for example, as a yoke or magnetic shield in a power supply device, a power receiving device, or both devices.

[0023] 2. Method for manufacturing nanocrystalline alloy strips One example of a method for producing nanocrystalline alloy strips is the method described in Japanese Patent Publication No. 2008-196006. This production method is as follows: First, a molten alloy containing each component of the nanocrystalline alloy strip is rapidly cooled by a single-roll method to obtain an amorphous alloy strip. The thickness of the amorphous alloy strip is preferably 20 μm or less, and more preferably 18 μm or less.

[0024] Next, the amorphous alloy strip is slit to form a ribbon of a predetermined width. Then, the amorphous alloy strip is heat-treated. During the heat treatment, the amorphous alloy strip may be in the form of a single sheet or a toroidal core. The toroidal core is formed by winding the amorphous alloy strip. Through the above steps, a nanocrystalline alloy strip is obtained.

[0025] The composition of the manufactured nanocrystalline alloy strip is the same as that of the molten alloy. During heat treatment, for example, the temperature is raised to the maximum temperature at a constant rate, then maintained at the maximum temperature, and then lowered at a constant rate. Hereafter, unless otherwise specified, the heat treatment temperature refers to the maximum temperature. The heat treatment temperature is preferably between 500°C and 600°C. The heat treatment temperature is higher than the crystal temperature of the alloy. The atmosphere during heat treatment is, for example, a nitrogen gas atmosphere.

[0026] 3. Configuration of Magnetic Sheet 1 The structure of the magnetic sheet 1 will be explained based on Figure 1. The magnetic sheet 1 has a structure in which multiple nanocrystalline alloy strips 3 are laminated via an adhesive layer 5. The number of layers of nanocrystalline alloy strips 3 constituting the magnetic sheet 1 is preferably 2 to 500. The thickness of each nanocrystalline alloy strip 3 is preferably 20 μm or less, and more preferably 18 μm or less. When the thickness of the nanocrystalline alloy strip 3 is 20 μm or less, the loss is even smaller. When the thickness of the nanocrystalline alloy strip 3 is 18 μm or less, the loss is particularly small.

[0027] For example, cracks 7 are formed in the nanocrystalline alloy thin strip 3. Cracks 7 are magnetic gaps formed in the nanocrystalline alloy thin strip 3. Examples of cracks 7 include fissures and cracks in the nanocrystalline alloy thin strip 3.

[0028] The adhesive layer 5 is a layer of a known adhesive, such as an acrylic adhesive, a silicone adhesive, a urethane adhesive, synthetic rubber, or natural rubber. Acrylic adhesives are preferred because they have excellent heat resistance and moisture resistance, and can bond a wide range of materials. The adhesive layer 5 may have a single-layer structure or a multi-layer structure. The adhesive layer 5 may be a base film coated with adhesive on both sides. The thickness of the adhesive layer 5 is preferably 3 μm or more and 5 μm or less.

[0029] When a magnetic field of 800 A / m is applied, the magnetic flux density of the magnetic sheet 1 is, for example, 1.30 T or more. The magnetic flux density of the magnetic sheet 1 can be increased by increasing the magnetic flux density of the nanocrystalline alloy thin strip 3 that constitutes the magnetic sheet 1.

[0030] The Q-factor of magnetic sheet 1 when a magnetic field with a frequency of 128 kHz is applied is, for example, 25 or higher. The Q-factor of magnetic sheet 1 can be increased by increasing the Q-factor of the nanocrystalline alloy thin strip 3 that constitutes magnetic sheet 1.

[0031] The relative permeability of magnetic sheet 1 when a magnetic field with a frequency of 128 kHz is applied is, for example, between 8,000 and 40,000. By adjusting the relative permeability of the nanocrystalline alloy thin strip 3 that constitutes magnetic sheet 1, the relative permeability of magnetic sheet 1 can be set to between 8,000 and 40,000.

[0032] The iron loss of magnetic sheet 1 when a magnetic field with a frequency of 128 kHz and a magnetic flux density of 0.2 T is applied is, for example, 1100 kW / m 3 The following is achieved: By reducing the iron loss of the nanocrystalline alloy thin strip 3 that constitutes the magnetic sheet 1, the iron loss of the magnetic sheet 1 is reduced to 1100 kW / m 3 The following is possible:

[0033] 4. Manufacturing method of magnetic sheet 1 The manufacturing method for the magnetic sheet 1 will be explained based on Figures 2 and 3. As shown in Figure 2, a unit 12 is created by adhering crack-resistant tape 11 to one side of a nanocrystalline alloy thin strip 3. Multiple unit 12s are prepared.

[0034] The crack-resistant tape 11 has a structure in which an adhesive layer 5 and a release film 13 are laminated together. The release film 13 can be peeled off from the adhesive layer 5. In the crack-resistant tape 11, the adhesive layer 5 faces the nanocrystalline alloy strip 3 and is bonded to the nanocrystalline alloy strip 3.

[0035] Next, as shown in Figure 3, in each unit unit 12, cracks 7 are formed in the nanocrystalline alloy strip 3 by applying an external force to the nanocrystalline alloy strip 3. For example, cracks 7 can be formed by pressing a convex member against the surface of the nanocrystalline alloy strip 3. Examples of the shape of the convex member include a rod shape, a cone shape, etc. Examples of the shape of the tip of the convex member include a flat shape, a cone shape, an inverted cone shape with a central depression, a cylindrical shape, etc.

[0036] When forming cracks 7, it is preferable to press convex members against multiple locations on the surface of the nanocrystalline alloy strip 3 to form multiple cracks 7. For example, a press member in which multiple convex members are regularly arranged can be used to form cracks 7. For example, cracks 7 can be formed using a roll (hereinafter referred to as a cracking roll) with multiple convex members arranged on its circumferential surface. For example, cracks 7 can be continuously formed by pressing a long nanocrystalline alloy strip 3 against a cracking roll or by passing a long nanocrystalline alloy strip 3 between cracking rolls. Cracks 7 can also be formed using multiple cracking rolls.

[0037] Next, the release film 13 is peeled off from each unit unit 12. After peeling off the release film 13, each unit unit 12 consists of a nanocrystalline alloy strip 3 and an adhesive layer 5. Next, by stacking multiple unit units 12, the magnetic sheet 1 shown in Figure 1 is obtained.

[0038] 5. Effects of the nanocrystalline alloy thin strip and magnetic sheet 1 (1A) The nanocrystalline alloy strip and magnetic sheet 1 of this disclosure have a high saturation magnetic flux density and can suppress losses. Furthermore, because the magnetic sheet 1 of this disclosure has a high saturation magnetic flux density, the magnetic sheet 1 can be made thinner. Generally, losses tend to increase as the saturation magnetic flux density increases, but the nanocrystalline alloy strip and magnetic sheet 1 of this disclosure have a high saturation magnetic flux density and can suppress losses.

[0039] (1B) The nanocrystalline alloy thin magnetic sheet 1 of this disclosure has a small absolute value of magnetostriction. (1C) The nanocrystalline alloy thin strip of the present disclosure has a relative permeability within a suitable range when a magnetic field of frequency 100 kHz is applied. The magnetic sheet 1 of the present disclosure has a relative permeability within a suitable range when a magnetic field of frequency 128 kHz is applied.

[0040] (1D) The nanocrystalline alloy thin strip of this disclosure has a high Q value when a magnetic field of 100 kHz is applied. The magnetic sheet 1 of this disclosure has a high Q value when a magnetic field of 128 kHz is applied.

[0041] <Example 1> 1. Manufacturing of nanocrystalline alloy thin strips S1-S14 Nanocrystalline alloy strips S1 to S14 were manufactured using the method described in the first embodiment. The composition of the molten alloy used to manufacture the nanocrystalline alloy strips S1 to S14 is shown in Table 1. The unit of the blending amount of each component in Table 1 is atomic percent. The composition of the nanocrystalline alloy strips S1 to S14 was the same as the composition of the molten alloy used to manufacture them. The atmosphere during heat treatment was a nitrogen gas atmosphere. The thickness of the nanocrystalline alloy strips S1 to S14 was 16 μm.

[0042] [Table 1]

[0043] Each of the nanocrystalline alloy strips S1 to S14 had multiple types depending on the heat treatment temperature and the form of the amorphous alloy strip during heat treatment. The heat treatment temperatures were at two levels: 570°C and 580°C. The form of the amorphous alloy strip during heat treatment included a single sheet and a toroidal core.

[0044] 2. Evaluation of nanocrystalline alloy thin strips S1-S14 The following properties were measured for each of the nanocrystalline alloy thin strips S1 to S14. Note that the magnetostrictive constant λs was measured for some of the samples. Magnetostriction constant λs (ppm) B800T(T) Relative permeability μ' when a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied. Relative permeability μ” when a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied. Q value when a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied. Iron loss Pcv (kW / m) when a magnetic field with frequency 100 kHz and magnetic flux density 0.2 T is applied. 3 ) Iron loss Pcm (W / Kg) when a magnetic field with frequency 100kHz and magnetic flux density 0.2T is applied. Iron loss Pcm (W / Kg) when a magnetic field with frequency 20kHz and magnetic flux density 0.2T is applied.

[0045] The method for measuring the magnetostrictive constant λs involved applying a magnetic field of 5 kOe to a sample (nanocrystalline alloy thin strip) to which a strain gauge manufactured by Kyowa Electric Industry was attached, rotating the electromagnet 360°, and measuring the maximum change in the elongation and contraction of the sample as a result of changing the direction of the magnetic field applied to the sample by 360°, based on the change in the electrical resistance value of the strain gauge. In this case, the magnetostrictive constant λs was defined as λs = 2 / 3 × maximum change. B800T represents the magnetic flux density when a magnetic field of 800 A / m is applied. The measurement method for B800T involved applying a magnetic field of 800 A / m to a heat-treated nanocrystalline alloy thin strip (toroidal core sample) using a DC magnetization characteristic tester manufactured by Metron Giken, and measuring the maximum magnetic flux density at that time. The method for measuring the relative permeability μ' involved placing a heat-treated nanocrystalline alloy thin strip (toroidal core sample, inner diameter 15 mm, outer diameter approximately 19 mm) in a case, winding the primary and secondary windings with one turn each, and measuring the relative permeability μ' at frequencies of 10 kHz and 100 kHz.

[0046] The method for measuring the relative permeability μ'' was to place a heat-treated nanocrystalline alloy thin strip (toroidal core sample, inner diameter 15 mm, outer diameter approximately 19 mm) in a case, with one turn of primary and secondary windings, and measure the relative permeability μ'' at frequencies of 10 kHz and 100 kHz. The method for measuring iron loss Pcv involved placing a heat-treated nanocrystalline alloy thin strip (toroidal core sample, inner diameter 15 mm, outer diameter approximately 19 mm) in a case, with 3 turns of primary and secondary windings, and measuring the iron loss at frequencies of 10 kHz and magnetic flux densities of 0.2 T, and at 100 kHz and magnetic flux densities of 0.2 T. The iron loss (Pcm) was measured using an IWATSU BH analyzer SY8218. A heat-treated nanocrystalline alloy strip (toroidal core sample, inner diameter 15 mm, outer diameter approximately 19 mm) was placed in a case, and the iron loss was measured at a frequency of 10 kHz and magnetic flux density of 0.2 T, and at 100 kHz and magnetic flux density of 0.2 T, with three turns of primary and secondary windings. The measurement results for the above characteristics are shown in Table 2.

[0047] [Table 2]

[0048] For the magnetostrictive constant λs, the measurement was performed on nanocrystalline alloy strips S1 to S14, specifically those with a heat treatment temperature of 580°C and in the form of a single sheet during heat treatment. For other properties, the measurement was performed on nanocrystalline alloy strips S1 to S14, specifically those with a heat treatment temperature of 570°C and in the form of a toroidal core during heat treatment.

[0049] In Table 2, (100kHz, 0.2T) indicates the measurement value when a magnetic field with a frequency of 100kHz and a magnetic flux density of 0.2T is applied. Similarly, (20kHz, 0.2T) indicates the measurement value when a magnetic field with a frequency of 20kHz and a magnetic flux density of 0.2T is applied.

[0050] <Example 2> 1. Manufacturing of magnetic sheets S21-S23 Magnetic sheets S21 to S23 were manufactured using the manufacturing method described in the first embodiment. The composition of the nanocrystalline alloy strip 3 constituting the magnetic sheets S21 to S23 was as shown in Table 3. The units for the amount of each component in Table 3 are atomic percent.

[0051] [Table 3]

[0052] The thickness of the nanocrystalline alloy strip 3 constituting the magnetic sheets S21-S23 was 16 μm. In magnetic sheets S21-S23, the material of the adhesive layer 5 was an acrylic resin. In magnetic sheets S21-S23, the thickness of the adhesive layer 5 was 5 μm. Each of the magnetic sheets S21-S23 had the following three types.

[0053] (Type 1) The nanocrystalline alloy strip 3 consisted of 5 layers. The shape of the nanocrystalline alloy strip 3 was a rectangular veneer. The length of the long side of the veneer was 12 cm, and the length of the short side was 5 cm. No cracks 7 were formed in the nanocrystalline alloy strip 3.

[0054] (Type 2) The nanocrystalline alloy strip 3 consisted of 5 layers. The shape of the nanocrystalline alloy strip 3 was a single square sheet. The length of each side of the sheet was 6 cm. No cracks 7 were formed in the nanocrystalline alloy strip 3.

[0055] (Type 3) The nanocrystalline alloy thin strip 3 had 15 layers. The shape of the nanocrystalline alloy thin strip 3 was annular. The outer diameter of the ring was 19.9 mm, and the inner diameter of the ring was 8.6 mm.

[0056] 2. Evaluation of magnetic sheets S21-S23 The following characteristics were measured for each of the magnetic sheets S21 to S23. B800T(T) Q value when a magnetic field with a frequency of 128 kHz is applied. Relative permeability μ' when a magnetic field with a frequency of 128 kHz is applied. Relative permeability μ'' when a magnetic field with a frequency of 128 kHz is applied. Iron loss Pcv (kW / m) when a magnetic field with frequency 128 kHz and magnetic flux density 0.2 T is applied. 3 )

[0057] The measurement conditions for B800T(T) involved applying a magnetic field of 800 A / m to a heat-treated nanocrystalline alloy thin strip (toroidal core sample) using a DC magnetization characteristic tester manufactured by Metron Giken, and measuring the maximum magnetic flux density at that time. The measurement conditions for the Q value involved using an Agilent LCR Meter E4980A. The measurement conditions for relative permeability μ' and μ'' involved measuring the relative permeability μ' and μ'' on a heat-treated nanocrystalline alloy thin strip with one turn primary and secondary windings and a frequency of 128 kHz using an IWATSU BH analyzer SY8218. The measurement conditions for iron loss Pcv involved measuring the iron loss Pcv on a heat-treated nanocrystalline alloy thin strip with three turns primary and secondary windings and a frequency of 128 kHz using an IWATSU BH analyzer SY8218.

[0058] For B800T(T), Type 1 of magnetic sheets S21-S23 was used for measurement. For the Q value, Type 2 of magnetic sheets S21-S23 was used for measurement. For relative permeability μ', relative permeability μ'', and iron loss Pcv, Type 3 of magnetic sheets S21-S23 was used for measurement. The measurement results for each characteristic are shown in Table 4.

[0059] [Table 4]

[0060] Table 4 shows the measurement results for "no cracks" and "cracks present". "No cracks" means a magnetic sheet that has not undergone crack treatment. "Cracks present" means a magnetic sheet that has undergone crack treatment. In crack treatment, a cracking roll is struck against the magnetic sheet to form cracks. The cracking roll has predetermined protrusions on its surface. These protrusions apply an external force directly to the magnetic sheet, causing cracks to form. In Table 4, (128kHz) indicates the measurement value when a magnetic field of 128kHz is applied. In Table 4, (128kHz, 0.2T) indicates the measurement value when a magnetic field of 128kHz and a magnetic flux density of 0.2T is applied. For all of the magnetic sheets S21 to S23, B800T(T) was 1.30T or higher. However, for the "cracked" magnetic sheets S21 to S22, B800T(T) was less than 1.30T. Furthermore, the Q value was 25 or higher for all magnetic sheets S21 to S23. Also, the relative permeability μ' and μ'' were both 3000 or higher for all magnetic sheets S21 to S23. However, for magnetic sheets S21 to S23 with cracks, the relative permeability μ'' was less than 3000. Additionally, the iron loss Pcv was 1100 kW / m for all magnetic sheets S21 to S23. 3 The results were as follows:

[0061] <Other Embodiments> Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above and can be implemented in various modified forms.

[0062] (1) The function of one component in each of the above embodiments may be divided among multiple components, or the function of multiple components may be performed by one component. Also, some of the configurations of each of the above embodiments may be omitted. Also, at least some of the configurations of each of the above embodiments may be added to, replaced with, etc., the configurations of other embodiments.

[0063] (2) In addition to the nanocrystalline alloy strips and magnetic sheets described above, this disclosure can also be realized in various forms, such as a method for manufacturing nanocrystalline alloy strips and a method for manufacturing magnetic sheets.

[0064] [Technical concepts disclosed in this specification] [Item 1] The composition is represented by the following formula (1), The magnetic flux density when a magnetic field of 800 A / m is applied is 1.30 T or more. The iron loss is 500 kW / m when a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied. 3 The following is: Nanocrystalline alloy thin strip. Equation (1) Fe 100-a-b-c-d-e X a -Si b -B c -Cu d -M e (In formula (1) above, the units of a, b, c, d, and e are atomic percent. X is at least one element selected from Ni and Co. M is at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The values ​​of a, b, c, d, and e are as follows: 0.0 ≤ a ≤ 3.0, 11.0 ≤ b ≤ 16.0, 5.0 ≤ c ≤ 9.0, 0 ≤ d ≤ 1.5, 1.5 ≤ e ≤ 3.0) [Item 2] A nanocrystalline alloy thin strip as described in item 1, The magnetic flux density when a magnetic field of 800 A / m is applied is 1.35 T or more. The iron loss is 450 kW / m when a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied. 3 The following is: Nanocrystalline alloy thin strip. [Item 3] A nanocrystalline alloy thin strip as described in item 1 or 2, The thickness is 20 μm or less. Nanocrystalline alloy thin strip. [Item 4] A nanocrystalline alloy thin strip as described in item 1 or 2, The thickness is 18 μm or less. Nanocrystalline alloy thin strip. [Item 5] A nanocrystalline alloy thin strip described in any one of items 1 to 4, The absolute value of the magnetostriction is 4.0 ppm or less. Nanocrystalline alloy thin strip. [Item 6] A nanocrystalline alloy thin strip described in any one of items 1 to 4, The absolute value of the magnetostriction is 3.0 ppm or less. Nanocrystalline alloy thin strip. [Item 7] A nanocrystalline alloy thin strip described in any one of items 1 to 6, The relative permeability when a magnetic field with a frequency of 100 kHz is applied is between 5000 and 50000. Nanocrystalline alloy thin strip. [Item 8] A nanocrystalline alloy thin strip described in any one of items 1 to 6, The relative permeability when a magnetic field with a frequency of 100 kHz is applied is between 8000 and 40000. Nanocrystalline alloy thin strip. [Item 9] A nanocrystalline alloy thin strip described in any one of items 1 to 8, The Q-factor is 0.5 or higher when a magnetic field with a frequency of 100 kHz is applied. Nanocrystalline alloy thin strip. [Item 10] A nanocrystalline alloy thin strip described in any one of items 1 to 9, The value of (100-abcde) / b is between 14 and 22. Nanocrystalline alloy thin strip. [Item 11] A nanocrystalline alloy thin strip described in any one of items 1 to 10, M contains Nb, e is between 2.0 and 2.5. Nanocrystalline alloy thin strip. [Item 12] A nanocrystalline alloy thin strip described in any one of items 1 to 11, The Si / Fe ratio, which is the ratio of the number of Si atoms to the number of Fe atoms, is 0.2 or less. Nanocrystalline alloy thin strip. [Item 13] A magnetic sheet in which 2 to 500 nanocrystalline alloy thin strips are laminated with an adhesive layer, The nanocrystalline alloy thin strip is a nanocrystalline alloy thin strip described in any one of items 1 to 10. The magnetic flux density is 1.30 T or higher when a magnetic field of 800 A / m is applied. Magnetic sheet. [Item 14] A magnetic sheet in which 2 to 500 nanocrystalline alloy thin strips are laminated with an adhesive layer, The nanocrystalline alloy thin strip is a nanocrystalline alloy thin strip described in any one of items 1 to 10. The Q-factor is 25 or higher when a magnetic field with a frequency of 128 kHz is applied. Magnetic sheet. [Item 15] A magnetic sheet in which 2 to 500 nanocrystalline alloy thin strips are laminated with an adhesive layer, The nanocrystalline alloy thin strip is a nanocrystalline alloy thin strip described in any one of items 1 to 10. The relative permeability when a magnetic field with a frequency of 128 kHz is applied is between 8000 and 40000. The iron loss is 1100 kW / m when a magnetic field with a frequency of 128 kHz and a magnetic flux density of 0.2 T is applied. 3 The following is: Magnetic sheet. [Explanation of Symbols]

[0065] 1…Magnetic sheet, 3…Nanocrystalline alloy thin strip, 5…Adhesive layer, 7…Crack, 11…Crack tape, 12…Unit, 13…Release film

Claims

1. The composition is represented by the following formula (1), The magnetic flux density when a magnetic field of 800 A / m is applied is 1.30 T or more. When a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied, the iron loss is 500 kW / m. ３ The following is: Nanocrystalline alloy thin strip. Formula (1) Fe １００－ａ－ｂ－ｃ－ｄ－ｅ X ａ -Si ｂ -B ｃ -Cu ｄ -M ｅ (In formula (1) above, the units of a, b, c, d, and e are atomic percent. X is at least one element selected from Ni and Co. M is at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The values ​​of a, b, c, d, and e are as follows: 0.0 ≤ a ≤ 3.0, 11.0 ≤ b ≤ 16.0, 5.0 ≤ c ≤ 9.0, 0 ≤ d ≤ 1.5, 1.5 ≤ e ≤ 3.0)

2. A nanocrystalline alloy thin strip according to claim 1, The magnetic flux density when a magnetic field of 800 A / m is applied is 1.35 T or more. When a magnetic field with a frequency of 100 kHz and a magnetic flux density of 0.2 T is applied, the iron loss is 450 kW / m. ３ The following is: Nanocrystalline alloy thin strip.

3. A nanocrystalline alloy thin strip according to claim 1, The thickness is 20 μm or less. Nanocrystalline alloy thin strip.

4. A nanocrystalline alloy thin strip according to claim 1, The thickness is 18 μm or less. Nanocrystalline alloy thin strip.

5. A nanocrystalline alloy thin strip according to claim 1, The absolute value of the magnetostriction is 4.0 ppm or less. Nanocrystalline alloy thin strip.

6. A nanocrystalline alloy thin strip according to claim 1, The absolute value of the magnetostriction is 3.0 ppm or less. Nanocrystalline alloy thin strip.

7. A nanocrystalline alloy thin strip according to claim 1, The relative permeability when a magnetic field with a frequency of 100 kHz is applied is between 5000 and 50000. Nanocrystalline alloy thin strip.

8. A nanocrystalline alloy thin strip according to claim 1, The relative permeability when a magnetic field with a frequency of 100 kHz is applied is between 8000 and 40000. Nanocrystalline alloy thin strip.

9. A nanocrystalline alloy thin strip according to claim 1 or 4, The Q-factor is 0.5 or higher when a magnetic field with a frequency of 100 kHz is applied. Nanocrystalline alloy thin strip.

10. A nanocrystalline alloy thin strip according to claim 1, The value of (100 - a - b - c - d - e) / b is between 14 and 22. Nanocrystalline alloy thin strip.

11. A nanocrystalline alloy thin strip according to claim 1, M includes Nb, e is between 2.0 and 2.

5. Nanocrystalline alloy thin strip.

12. A nanocrystalline alloy thin strip according to claim 1, The Si / Fe ratio, which is the ratio of the number of Si atoms to the number of Fe atoms, is 0.2 or less. Nanocrystalline alloy thin strip.

13. A magnetic sheet in which 2 to 500 nanocrystalline alloy strips are laminated with an adhesive layer in between, The nanocrystalline alloy thin strip is the nanocrystalline alloy thin strip described in claim 1, The magnetic flux density is 1.30 T or more when a magnetic field of 800 A / m is applied. Magnetic sheet.

14. A magnetic sheet in which 2 to 500 nanocrystalline alloy strips are laminated with an adhesive layer in between, The nanocrystalline alloy thin strip is the nanocrystalline alloy thin strip described in claim 1, The Q-factor is 25 or higher when a magnetic field with a frequency of 128 kHz is applied. Magnetic sheet.

15. A magnetic sheet in which 2 to 500 nanocrystalline alloy strips are laminated with an adhesive layer in between, The nanocrystalline alloy thin strip is the nanocrystalline alloy thin strip described in claim 1, The relative permeability when a magnetic field with a frequency of 128 kHz is applied is between 8000 and 40000. The iron loss is 1100 kW / m when a magnetic field with a frequency of 128 kHz and a magnetic flux density of 0.2 T is applied. ３ is as follows. Magnetic sheet.

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