Iron-based nanocrystalline alloy material, preparation method, alloy strip and application

Abstract

The invention provides an iron-based nanocrystalline alloy material. The chemical expression of component atoms of the alloy material is Fe Si B < c > Nb < d > Cu < e > X < f >, x is a combination of at least two elements of Ni, P, Mo, V, Co and Zn; in the formula, 80 < = a < = 84, 6.5 < = b < = 10, 6 < = c < = 9, 1 < = d < = 3, 0.6 < = e < = 1.5, 0.6 < = f < = 1.5, and a + b + c + d + e + f = 100. The combination of at least two elements of Ni, P, Mo, V, Co and Zn is introduced to modify the existing iron, silicon, boron, niobium and copper alloy, so that the high-frequency loss of the alloy material is reduced, and the overall magnetic performance of the alloy material is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic materials, and particularly provides an iron-based nanocrystalline alloy material, a preparation method, an alloy strip and application. BACKGROUND

[0002] The iron-based nanocrystalline strip is composed of nanoscale crystal particles and has a highly ordered grain structure. The iron-based nanocrystalline strip has high thermal stability, excellent mechanical properties, super magnetic behavior and electrical properties and is widely used in the fields of electric power, industrial power, new energy, rail transit, consumer electronics and wireless charging.

[0003] At present, the main components of the iron-based nanocrystalline strip include iron, silicon, boron, niobium and copper and are formed through a rapid solidification process. The iron-based nanocrystalline strip exhibits excellent magnetic properties in high-frequency applications, but also faces the problem of high-frequency loss. The loss at high frequency may cause the device to heat, reduce the efficiency and possibly affect the stability and service life of the device. Moreover, the existing preparation process cannot reduce the high-frequency loss.

[0004] Therefore, in view of the above problem of high loss at high frequency, how to design an iron-based nanocrystalline strip with low loss at high frequency and a simple and efficient preparation method is a problem that needs to be solved at present. SUMMARY

[0005] The purpose of the present application is to solve the problem of high loss at high frequency of the existing iron-based nanocrystalline alloy. The purpose of the present application is achieved by the following scheme. The present application provides an iron-based nanocrystalline alloy material. The component atomic chemical expression of the alloy material is as follows: Fe a Si b B c Nb d Cu e X f ; X is a combination of at least two elements selected from Ni, P, Mo, V, Co and Zn; in the formula, 80≤a≤84, 6.5≤b≤10, 6≤c≤9, 1≤d≤3, 0.6≤e≤1.5, 0.6≤f≤1.5, and a+b+c+d+e+f=100.

[0006] Preferably, when X includes Ni, the mass ratio of Ni in X is 1-10; and / or when X includes P, the mass ratio of P in X is 1-5; and / or when X includes Mo, the mass ratio of Mo in X is 1-3; and / or when X includes V, the mass ratio of V in X is 1-3; and / or when X includes Co, the mass ratio of Co in X is 1-2; and / or when X includes Zn, the mass ratio of Zn in X is 0.5-2.

[0007] Based on the same inventive concept, the application further provides a preparation method of the iron-based nanocrystalline alloy material, comprising: a melting treatment: preparing raw materials according to the alloy components of the iron-based nanocrystalline alloy material, mixing the raw materials, and then performing second-stage melting to obtain a molten steel, wherein the purity of all the raw materials is greater than 99.9%; a single-roller rapid cooling treatment: spraying the molten steel to the surface of a rotating cooling roller to form a continuous amorphous strip-shaped material; a magnetization treatment: sequentially performing a magnetic field application, a heating treatment, and a cooling treatment on the amorphous strip-shaped material to obtain a magnetized strip material with stable microstructure and magnetic properties; and a strengthening treatment: sequentially performing a pulse current treatment and a low-temperature transverse magnetic field treatment on the magnetized strip material to obtain the iron-based nanocrystalline alloy material.

[0008] Preferably, the second-stage melting comprises a converter steelmaking stage and an off-furnace refining stage, and the off-furnace refining stage comprises a vacuum treatment, a powder spraying treatment, and an argon blowing stirring treatment.

[0009] Preferably, in the melting treatment step, the melting temperature of the converter steelmaking stage is 1600-1800°C, and the melting time is 10-20 min.

[0010] Preferably, in the single-roller rapid cooling treatment step, the angle between the direction of spraying the molten steel and the normal line of the surface of the cooling roller is 14°, the surface linear velocity of the cooling roller is 10-35 m / s, the spraying pressure is 4.9×10 4 Pa-9.6×10 4 Pa.

[0011] Preferably, in the single-roller rapid cooling treatment step, the width of the amorphous strip-shaped material is not less than 150 mm, and the thickness is not greater than 16 μm.

[0012] Preferably, in the magnetization treatment step, the amorphous strip-shaped material is placed in a magnetic field environment, the direction of the magnetic field is adjusted to be consistent with the length direction of the amorphous strip-shaped material, and the magnetic field strength of the magnetic field application is 50-200 mT.

[0013] Preferably, in the magnetization treatment step, the heating temperature of the heating treatment is 510-560°C, and the holding time is 30-90 min.

[0014] Preferably, in the magnetization treatment step, the cooling treatment adopts a fan cooling, and the cooling rate is not higher than 10°C / min.

[0015] Preferably, in the strengthening treatment step, the pulse current treatment adopts a pulse current generator, the frequency of the pulse current of the pulse current generator is 20-30 Hz, the current density is 5.0×10 3 A / cm 2 -5.82×103 A / cm 2 The pulse width is 200ns, and the processing time is 10s-60s.

[0016] Preferably, in the strengthening process, the temperature of the low-temperature transverse magnetic field treatment is controlled at 350℃-450℃, the magnetic field strength is 50mT-100mT, and the holding time is 30min-60min.

[0017] Preferably, in the smelting process, the purity of the raw materials silicon, copper and zinc is 99.99%, the purity of the raw material iron is 99.98%, and the purity of the raw material cobalt is 99.95%.

[0018] Based on the same inventive concept, the present invention also provides an iron-based nanocrystalline alloy strip, which is made by the preparation method of the iron-based nanocrystalline alloy material.

[0019] Based on the same inventive concept, the present invention also provides an application of the aforementioned iron-based nanocrystalline alloy strip in the fields of high-frequency transformers or wireless charging.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides an iron-based nanocrystalline alloy material, the atomic chemical formula of which is: Fe a Si b B c Nb d Cu e X f X represents a combination of at least two elements selected from Ni, P, Mo, V, Co, and Zn; where 80≤a≤84, 6.5≤b≤10, 6≤c≤9, 1≤d≤3, 0.6≤e≤1.5, 0.6≤f≤1.5, and a+b+c+d+e+f=100. Existing iron, silicon, boron, niobium, and copper alloys are modified by introducing combinations of at least two elements selected from Ni, P, Mo, V, Co, and Zn to reduce high-frequency losses and improve the overall magnetic properties of the alloy materials.

[0021] Adding Ni can reduce the magnetic permeability of the alloy material and also reduce the AC loss during the use of the alloy material, thus achieving the effect of high frequency and low loss.

[0022] Adding phosphorus (P) can effectively refine the grain size and reduce the coercivity of the alloy material, which helps to further reduce losses.

[0023] The addition of Mo element can improve the amorphous forming ability, heat treatment stability and soft magnetic properties of the alloy material, help to improve the linearity of the alloy material hysteresis loop, thereby reducing the permeability of the alloy material, reducing the loss, and enabling the iron-based nanocrystalline alloy material to realize low-loss performance in high-frequency applications; in addition, the Mo element can improve the thermal strength of the alloy material, refine the grain, improve the tempering stability and corrosion resistance.

[0024] The addition of V element can significantly improve the permeability and anti-saturation magnetic field of the alloy material.

[0025] The addition of Co element can not only improve the saturation magnetization of the alloy material, reduce the coercive force, improve the magnetic performance hardening, but also improve the electrical conductivity and reactivity of the alloy material.

[0026] The addition of Zn element can effectively conduct and concentrate the magnetic field energy in the iron-based nanocrystalline alloy material, thereby showing high permeability of the alloy material, and the alloy material is very sensitive to the change of the magnetic field, thereby improving the efficiency and performance of the equipment.

[0027] The preparation method of the iron-based nanocrystalline alloy material provided by the application prepares an iron-based nanocrystalline alloy strip through melting treatment, single-roll rapid cooling treatment, magnetization treatment and strengthening treatment processes. Among them, niobium and copper are annealed below the crystallization temperature, thereby forming very small grain structures, and the size of these grains is only 10-20 nanometers. This crystalline material formed by special crystallization annealing of the amorphous alloy has a series of excellent magnetic properties, including high saturation magnetic induction, high permeability, low coercive force, low loss, good stability, high strength and toughness, and corrosion and wear resistance, and reduces the remanence Br value of the nanocrystalline magnetic core and improves the direct current resistance; the heating treatment in the magnetization treatment plays the role of promoting grain refinement, improving the magnetism of the material and improving the hardness, strength and plasticity of the material; the pulse current electric stimulation treatment in the strengthening treatment can generate a large amount of GOSS texture in the crystallization process, improve the magnetic induction intensity and magnetic properties of the alloy strip, and at the same time eliminate the original grain structure and form a new crystal structure, thereby improving the uniformity and stability of the alloy material. DETAILED DESCRIPTION

[0028] The following examples are provided to better further understand the application and are not limited to the best mode, and do not limit the content and protection scope of the application. Any person under the inspiration of the application or the combination of the application with other prior art features can obtain any product same or similar to the application, which falls within the protection scope of the application.

[0029] In the application, the specific experimental steps or conditions are not specified, and can be operated according to the conventional experimental steps described in the literature in the field.

[0030] The present application provides an iron-based nanocrystalline alloy material, the chemical formula of which is: Fe a Si b B c Nb d Cu e X f X is a combination of at least two elements selected from Ni, P, Mo, V, Co and Zn; wherein 80≤a≤84, 6.5≤b≤10, 6≤c≤9, 1≤d≤3, 0.6≤e≤1.5, 0.6≤f≤1.5, and a+b+c+d+e+f=100; a, b, c, d, e and f are the atomic percentage values of the corresponding elements.

[0031] When X includes Ni, the mass ratio of Ni in X is 1-10; and / or when X includes P, the mass ratio of P in X is 1-5; and / or when X includes Mo, the mass ratio of Mo in X is 1-3; and / or when X includes V, the mass ratio of V in X is 1-3; and / or when X includes Co, the mass ratio of Co in X is 1-2; and / or when X includes Zn, the mass ratio of Zn in X is 0.5-2.

[0032] That is, a combination of any two or more elements selected from Ni, P, Mo, V, Co and Zn, and the mass ratio of each element in X is (1-10):(1-5):(1-3):(1-3):(1-2):(0.5-2).

[0033] When X includes Ni, the addition of Ni element reduces the permeability of the alloy material, and also reduces the AC loss during use of the alloy material, thereby playing a role of high frequency and low loss. When X includes P, the P element can effectively refine the grain size, and also reduce the coercivity of the alloy, thereby further reducing the loss. When X includes Mo, the addition of Mo element can improve the amorphous forming ability, heat treatment stability and soft magnetic properties of the alloy, thereby improving the linearity of the hysteresis loop of the alloy material, reducing the permeability and loss of the alloy material, and enabling the iron-based nanocrystalline alloy material to achieve low loss performance in high frequency applications. In addition, Mo can also improve the thermal strength of the material, refine the grain, improve the tempering stability and corrosion resistance. When X includes V, the addition of V element can significantly improve the permeability and saturation magnetic field resistance of the material. When X includes Co, the addition of Co element can not only improve the saturation magnetization of the material, reduce the coercivity, improve the magnetic performance hardening, but also improve the electrical conductivity and reactivity of the material.

[0034] When X includes Zn, the addition of Zn element can effectively conduct and concentrate magnetic field energy, thereby improving the magnetic conductivity efficiency and performance.

[0035] The application also provides a preparation method of the iron-based nanocrystalline alloy material, comprising: 1) a smelting treatment: raw materials are prepared according to the alloy components of the iron-based nanocrystalline alloy material, and the raw materials are mixed and then subjected to two-stage smelting to obtain a molten steel, and the purity of all the raw materials is greater than 99.9%; In this step, first, each raw material is accurately weighed according to the proportion of the alloy components of the iron-based nanocrystalline alloy material, and the iron, silicon, boron, copper, nickel, phosphorus, cobalt, vanadium and zinc elements in the raw materials are introduced in the form of elemental materials, and the niobium is introduced in the form of niobium-iron alloy. The two-stage smelting includes a converter steelmaking stage and an off-furnace refining stage. The raw materials are mixed and then sent into a converter for smelting. The smelting temperature of the converter steelmaking stage is 1600-1800°C, and the smelting time is 10-20 min. The physical heat of iron and the heat generated by the chemical reaction between the oxygen sent into the furnace are used as the smelting heat source in the converter steelmaking stage. The off-furnace refining stage is subjected to vacuum treatment, powder spraying treatment and argon blowing stirring to remove impurities and improve the organizational structure, so as to improve the quality and performance of the molten steel.

[0036] In the raw materials, the purity of silicon, copper, nickel, phosphorus, molybdenum, vanadium, zinc, niobium and niobium-iron alloy is 99.99%, the purity of raw material iron is 99.98%, and the purity of raw material cobalt is 99.95%. It should be noted that the niobium-iron alloy is selected according to the niobium content.

[0037] 2) single-roll rapid cooling treatment: the molten steel is sprayed onto the surface of a rotating cooling roller to form a continuous amorphous strip-shaped material; In this step, the treatment is also called single-roll rapid quenching flat flow rapid cooling method. The molten steel of step 1) is sprayed onto the surface of a high-speed rotating cooling roller to rapidly cool the steel to form a certain width and continuous amorphous strip-shaped material. The angle between the direction of the spray pipe spraying the molten steel and the normal line of the surface of the cooling roller is 14°, the surface linear velocity of the cooling roller is 10-35 m / s, the spraying pressure is 4.9×10 4 Pa-9.6×10 4 Pa, the width of the amorphous strip-shaped material is not less than 150 mm, and the thickness is not more than 16 μm.

[0038] 3) magnetization treatment: the amorphous strip-shaped material is subjected to magnetic field application, heating treatment and cooling treatment in sequence to obtain magnetized strip material with stable microstructure and magnetic properties; In this step, first, the amorphous strip-shaped material is placed in the magnetic field environment of the magnetizing furnace, the magnetic field direction is adjusted to be consistent with the length direction of the amorphous strip-shaped material, and the magnetic field strength of the applied magnetic field is 50-200 mT. The application of the magnetic field can orient the grains in the material and help improve the heat treatment effect.

[0039] Then the amorphous strip material under the magnetic field is placed in a heating furnace for heating treatment, the heating temperature of the heating treatment is 510-560℃, and the holding time is 30-90min. During the heating treatment, the microstructure of the material changes, the grain size is reduced, the grain boundary is clear, and the magnetic domain structure is optimized.

[0040] Finally, the amorphous strip material after the heating treatment is subjected to cooling treatment, the cooling treatment is performed by using a fan, and the cooling rate is not higher than 10℃ / min, so as to stabilize the microstructure and magnetic properties of the material.

[0041] 4) strengthening treatment: the magnetized strip material is subjected to pulse current treatment and low-temperature transverse magnetic field treatment in sequence to obtain the iron-based nanocrystalline alloy material.

[0042] In this step, first, the magnetized strip material is subjected to pulse current treatment by using a pulse current generator, the frequency of the pulse current of the pulse current generator is 20-30Hz, the current density is 5.0×10 3 A / cm 2 -5.82×10 3 A / cm 2 , the pulse width is 200ns, and the treatment time is 10-60s. Through the pulse current treatment, the toughness and bending resistance of the strip material can be effectively improved, the strip material after the high-temperature heat treatment is not easy to break and bend, and the subsequent low-temperature magnetic field heat treatment is facilitated.

[0043] The strip material after the pulse current treatment is placed in a heating furnace for low-temperature transverse magnetic field treatment, the temperature of the low-temperature transverse magnetic field treatment is controlled at 350-450℃, the magnetic field strength is 50-100mT, and the holding time is 30-60min. Through the low-temperature magnetic field heat treatment, the magnetic domain structure of the material is effectively refined and widened, the grain size is reduced, and the grain density is increased, the high-frequency magnetic properties of the strip material can be further improved on the basis of the high-temperature magnetic field heat treatment in step 3) magnetization treatment, the saturation magnetic induction, the high-frequency permeability is improved, the coercive force and the high-frequency loss are reduced, and thus the iron-based nanocrystalline alloy material with high frequency and low loss is obtained.

[0044] Based on the same inventive concept, the application also provides an iron-based nanocrystalline alloy strip material prepared by the preparation method of the iron-based nanocrystalline alloy material.

[0045] Further, the application provides the iron-based nanocrystalline alloy strip material for application in the field of high-frequency transformers or wireless charging.

[0046] The element component ratio and preparation process parameters of the iron-based nanocrystalline alloy material in the above different ranges are selected to obtain the following specific embodiments.

[0047] Embodiments 1-10 Table 1 is a comparison table of the component element proportions of the iron-based nanocrystalline alloy materials in Examples 1-10, as shown in Table 1 below: Table 1

[0048] Table 2 is a comparison table of the main preparation parameters of the iron-based nanocrystalline alloy materials in Examples 1-10.

[0049] As shown in Table 2 below: Table 2

[0050] Comparative Example The component atomic chemical formula of the iron-based nanocrystalline alloy material of the present comparative example is: Fe 80 Si9B8Nb2Cu1, which is commercially available.

[0051] Result Test The saturation magnetic induction, coercivity (Hc) value, permeability, resistivity, high-frequency magnetic ring loss, and remanence of Examples 1-10 and the comparative example were tested.

[0052] The results are shown in Table 3 below: Table 3 is a comparison table of the test results of Examples 1-10 and the comparative example.

[0053] Table 3

[0054] Based on the data in Table 3, it can be seen that: (1) The saturation magnetic induction of Examples 1-10 of the present application is between 1.73T and 1.78T, all higher than the 1.72T of the comparative example. Among them, the saturation magnetic induction of Example 3 is as high as 1.78T. It can be seen that compared with existing alloy materials, the iron-based nanocrystalline alloy material prepared by the preparation method of the present application has a higher saturation magnetic induction, which means that the maximum magnetization degree that the magnetic material can reach under the action of an external magnetic field can accommodate more magnetic flux under an applied magnetic field, thereby improving the efficiency and performance of the product.

[0055] (2) The coercivity (Hc) value of Examples 1-10 of the present application is 0.28 A / m, while the coercivity (Hc) value of the comparative example is 0.30 A / m. It can be seen that the coercivity (Hc) value of the iron-based nanocrystalline alloy material prepared by the preparation method of the present application is lower. For amorphous nanocrystalline alloys, the coercivity is proportional to the loss, so the smaller the coercivity (Hc) value, the smaller the loss. In actual application, the loss at high frequency is small, which reduces the possibility of equipment heating, improves efficiency, and increases the stability and life of the equipment.

[0056] ‌(3) The magnetic permeability (10 kHz) of the inventive examples 1-10 at 10 kHz is all >20000 H / m, and the magnetic permeability (100 kHz) at 100 kHz is all >12000 H / m, while the magnetic permeability (10 kHz) of the comparative example at 10 kHz is only >18000 H / m and the magnetic permeability (100 kHz) at 100 kHz is >10000 H / m. It can be seen that the magnetic permeability of the iron-based nanocrystalline alloy material of the present application is much higher than that of the comparative example at 10 kHz and 100 kHz. Because of the higher magnetic permeability, the efficiency of the electromagnetic device can be improved, the energy loss can be reduced, the system stability and response speed can be improved, and the purpose of adapting to extreme environment can be achieved.

[0057] (4) The resistivity of the inventive examples 1-10 is between 85 μΩ*cm-90 μΩ*cm, while the resistivity of the comparative example is only 82 μΩ*cm. The resistivity of example 3 is as high as 90 μΩ*cm. It can be seen that high resistivity can bring the following benefits: reducing power loss, improving circuit stability, enhancing corrosion resistance, and being suitable for high-precision measurement.

[0058] (5) The high-frequency magnetic ring loss of the inventive examples 1-10 at 100 kHz, 0.2 T is all ≤18 W / kg, while the high-frequency magnetic ring loss of the comparative example is ≤20 W / kg. It can be seen that the high-frequency magnetic ring loss of the iron-based nanocrystalline alloy material of the present application is lower, which can reduce the energy loss in signal transmission. Because the high-frequency magnetic ring has low loss characteristics in high-frequency circuits, it can ensure the transmission efficiency and power conversion efficiency of the signal, thereby improving the reliability and stability of the entire circuit system.

[0059] (6) The residual magnetism of the inventive examples 1-10 at 20 kHz is all <0.3, while the residual magnetism of the comparative example is <0.28. Since residual magnetism means that the stronger the magnetism can be maintained after the action of the magnetic field, the iron-based nanocrystalline alloy material of the present application can maintain stronger magnetism after the action of the magnetic field.

[0060] In addition, the preparation method of the present application uses heating treatment in the magnetization process to promote grain refinement, improve the magnetic properties of the material, and improve the hardness, strength and plasticity of the material; the magnetization process changes the arrangement of the grains and the crystal structure by applying a magnetic field, thereby further improving the performance of the material and improving the magnetic and mechanical properties of the iron-based nanocrystalline alloy material, including increasing the saturation magnetic induction, magnetic permeability, reducing the high-frequency loss, coercivity, etc.; in addition, the magnetization process can accelerate grain growth and grain boundary migration at a larger magnetic field strength and higher temperature, forming finer grains, thereby improving the strength and toughness of the material, and longer processing time can also achieve better results.

[0061] The above merely illustrates the embodiments of the present application, but should not be taken as limitations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall into the protection scope of the present application.

Claims

1. An iron-based nanocrystalline alloy material, characterized in that, The atomic chemical formula of the alloy material is: Fe a Si b B c Nb d Cu e X f X is a combination of at least two elements selected from Ni, P, Mo, V, Co, and Zn. In the formula, 80≤a≤84, 6.5≤b≤10, 6≤c≤9, 1≤d≤3, 0.6≤e≤1.5, 0.6≤f≤1.5, and a+b+c+d+e+f=100.

2. The iron-based nanocrystalline alloy material according to claim 1, characterized in that, When X includes Ni, the mass ratio of Ni in X is 1-10; and / or When X includes P, the mass proportion of P in X is 1-5; and / or When X includes Mo, the mass proportion of Mo in X is 1-3; and / or When X includes V, the mass proportion of V in X is 1-3; and / or When X includes Co, the mass ratio of Co in X is 1-2; and / or When X includes Zn, the mass ratio of Zn in X is 0.5-2.

3. A method for preparing an iron-based nanocrystalline alloy material, characterized in that, include: Smelting process: The raw materials are prepared according to the alloy composition of the iron-based nanocrystalline alloy material according to any one of claims 1-2, and the raw materials are mixed and then smelted in a second stage to obtain molten steel. The purity of all raw materials is greater than 99.9%. Single-roll quenching: The molten steel is sprayed onto the surface of a rotating cooling roller to form a continuous amorphous ribbon material; Magnetization treatment: The amorphous ribbon material is subjected to a magnetic field, heating treatment and cooling treatment in sequence to obtain a magnetized ribbon material with stable microstructure and magnetic properties; Strengthening treatment: The magnetized strip is subjected to pulsed current treatment and low-temperature transverse magnetic field treatment in sequence to obtain the iron-based nanocrystalline alloy material.

4. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, The second-stage smelting includes a converter steelmaking stage and an external refining stage. The external refining stage includes vacuum treatment, powder injection treatment, and argon blowing and stirring treatment.

5. The method for preparing the iron-based nanocrystalline alloy material according to claim 4, characterized in that, In the smelting process, the smelting temperature in the converter steelmaking stage is 1600℃-1800℃, and the smelting time is 10min-20min.

6. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the single-roll quenching step, the angle between the direction of the molten steel injection and the normal to the surface of the cooling roll is 14°, the surface linear velocity of the cooling roll is 10 m / s-35 m / s, and the injection pressure is 4.9 × 10⁻⁶ m / s. 4 Pa -9.6×10 4 Pa.

7. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the single-roller rapid cooling process, the width of the amorphous strip material is not less than 150 mm and the thickness is not greater than 16 μm.

8. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the magnetization process, the amorphous ribbon material is placed in a magnetic field environment, and the direction of the magnetic field is adjusted to be consistent with the length direction of the amorphous ribbon material. The magnetic field strength of the applied magnetic field is 50mT-200mT.

9. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the magnetization process, the heating temperature is 510℃-560℃ and the holding time is 30min-90min.

10. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the magnetization process, the cooling process uses a fan for cooling, and the cooling rate is no higher than 10°C / min.

11. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the enhancement process, the pulse current processing employs a pulse current generator, wherein the frequency of the pulse current generated by the pulse current generator is 20Hz-30Hz, and the current density is 5.0×10⁻⁶. 3 A / cm 2 -5.82×10 3 A / cm 2 The pulse width is 200ns, and the processing time is 10s-60s.

12. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the strengthening process, the temperature of the low-temperature transverse magnetic field treatment is controlled at 350℃-450℃, the magnetic field strength is 50mT-100mT, and the holding time is 30min-60min.

13. The method for preparing the iron-based nanocrystalline alloy material according to claim 3, characterized in that, In the smelting process, the purity of the raw materials niobium-iron alloy, silicon, copper, and zinc is 99.99%, the purity of the raw material iron is 99.98%, and the purity of the raw material cobalt is 99.95%.

14. A type of iron-based nanocrystalline alloy strip, characterized in that, It is prepared using the method for preparing iron-based nanocrystalline alloy materials according to any one of claims 3-13.

15. The application of the iron-based nanocrystalline alloy strip according to claim 14 in the fields of high-frequency transformers or wireless charging.

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