High-lamination iron-based amorphous broadband and preparation method and application thereof

Abstract

The invention discloses a high-lamination iron-based amorphous broadband and a preparation method and application thereof, and belongs to the technical field of magnetic functional materials. The amorphous strip comprises the following raw materials in percentage by mass: 2.25-2.45 wt% of B, 4.58-5.02 wt% of Si, 0.5-1.5 wt% of composite functional metal elements, less than 50 ppm of Al, less than 50 ppm of Ti and the balance of iron, and contains inevitable trace impurity elements, and the total amount of the impurity elements is less than or equal to 0.5%. Through rare earth-transition metal synergistic doping and rare earth element pre-compounding process optimization, comprehensive improvement of the iron-based amorphous broadband in the aspects of magnetic performance, lamination coefficient and corrosion resistance is achieved, and the application prospect is wide.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetic functional materials, and particularly relates to a high-laminated iron-based amorphous wide strip and its preparation method and application. Background Art

[0002] Amorphous alloys, also known as liquid metals and metallic glasses, are new materials with the properties of molten metals prepared at an extremely high cooling rate in the molten state. Since the liquid atoms do not have time to nucleate and grow, they retain a series of characteristics in the molten state. Since the advent of amorphous alloys, they have gradually attracted the attention and application in various industries; for example: the high magnetic permeability, low loss, and low cost of iron-based amorphous alloys have gradually replaced ordinary silicon steel sheets in distribution transformers, improving the power conversion efficiency and achieving energy-saving benefits; the relatively high reactivity of amorphous alloys gives them excellent degradation properties, and their good biocompatibility makes them biodegradable biomaterials used in fields such as blood vessels and bone scaffolds in biomedicine; their high corrosion resistance and excellent electrical conductivity have also made amorphous alloys gradually stand out in the field of wastewater degradation; compared with crystals, their better strength, hardness and other mechanical properties have enabled amorphous alloys to be used in devices such as cutting tools. In recent years, amorphous alloys have gradually grown and developed among many new materials and have received certain attention and development in various industries. It is worth noting that iron-based amorphous alloys have great development potential due to their excellent magnetic properties, low loss, corrosion resistance and mechanical properties, which promote their application in various industries.

[0003] There are many problems in the existing equipment and processes for producing iron-based amorphous alloy wide strips, and they generally have the characteristics of low lamination coefficient and poor comprehensive performance. Although the iron-based amorphous wide strips produced abroad do not have longitudinal vertical stripes, their lamination coefficient is only about 0.88; domestic strips generally have longitudinal vertical stripes, which will reduce the lamination coefficient of the strips, and the control of molten steel temperature and liquid level is unstable, resulting in unstable lamination coefficients of the produced strips.

[0004] For example, Chinese Patent Publication No. CN 102314985 A proposes an iron-based amorphous alloy wide strip and its manufacturing method. Its production process still uses traditional methods, and the nozzle slit width is still 0.4 - 0.7 mm. This is because their smelting process or / and the spray package structure cannot make the impurity particles in the molten steel reach the spray strip level of a 0.3 - 0.4 mm slit. The lamination coefficient of the produced iron-based amorphous alloy wide strip can only reach a level greater than 0.84.

[0005] Chinese Patent Publication No. CN110819915A proposes an iron-based amorphous thin strip and its preparation method. By limiting the activity of the molten pool within a certain range, it ensures the smooth progress of the preparation of the iron-based amorphous thin strip and improves the strip quality. However, the lamination coefficient of the prepared iron-based amorphous strip is only ≥0.89.

[0006] At the same time, the defects in the iron-based amorphous wide band preparation method or the material itself in the current existing technology cause the iron-based amorphous wide band to have a low stacking coefficient, uneven surface, poor corrosion resistance, and low comprehensive magnetic properties. Therefore, how to optimize the material composition and preparation method to obtain an iron-based amorphous material with a high stacking coefficient and excellent comprehensive performance is a technical problem that needs to be solved urgently. Summary of the invention

[0007] The present invention aims to solve the problems existing in the prior art by adding composite metal elements in a specific proportion to optimize the alloy composition. The alloy is prepared as a pre-alloy and then mixed and smelted to optimize the smelting process, thereby achieving a comprehensive improvement in the magnetic properties, lamination coefficient and corrosion resistance of the iron-based amorphous wide band.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the present invention is: A high-laminated iron-based amorphous wide band comprises the following raw materials by mass percentage: B2.25-2.45wt%, Si4.58-5.02wt%, composite functional metal elements 0.5-1.5%, Al and Ti contents both less than 50ppm, the balance being iron, and containing inevitable trace impurity elements, with the total amount of impurity elements being ≤0.5%.

[0009] Furthermore, the content of the composite functional metal element is 1%.

[0010] Furthermore, the composite functional metal element is a combination of Gd, Nb and V, and the mass ratio of the three is 1:1:1.

[0011] A method for preparing a high-stack iron-based amorphous wide band comprises the following preparation steps: (1) Preparation of composite master alloy: The composite functional metal elements Gd, Nb and V are mixed in a mass ratio of 1:1:1 and smelted in a vacuum induction furnace to form a uniform pre-alloyed ingot, which is crushed to a particle size of ≤1 mm before use; (2) Melting: the raw materials except the composite functional metal element are mixed according to the percentage, put into the medium frequency furnace for smelting, and after all the raw materials are melted, the pre-alloyed ingot obtained in step (1) is added to make the composition of the molten steel finally controlled to be B2.25-2.45wt%, Si4.58-5.02wt%, composite functional metal element 0.5-1.5%, Al and Ti content both less than 50ppm, the balance is iron, and it contains inevitable trace impurity elements, the total amount of impurity elements is ≤0.5%; during smelting, the molten steel is protected by a protective gas; the heating temperature of the smelting furnace is 1200-1500°C; the completely melted molten steel is further smelted for 7-10min under the action of electromagnetic stirring; (3)Heat preservation treatment: Evacuate the intermediate heat preservation ladle, fill it with protective gas, heat the ladle to 1300 - 1400 °C, pour the molten alloy in step (2) into the intermediate heat preservation ladle, keep it at a constant temperature for 10 - 15 minutes, and keep the alloy liquid at a constant temperature of 1350 - 1450 °C; (4)Strip spraying: Pour the alloy liquid after heat preservation in step (3) into the strip spraying ladle, and spray it onto the cooled copper roller through the nozzle of the strip spraying ladle under the protective gas to form an iron-based amorphous strip; (5)Annealing treatment: Place the continuous amorphous alloy strip in a vacuum annealing tunnel furnace, and perform annealing crystallization treatment under a transverse and longitudinal alternating magnetic field at 300 °C - 400 °C; After passing the annealed and crystallized strip through an alloy pair rolling mill, it is then die-cut and packaged to obtain the final product.

[0012] Further, during the vacuum induction furnace melting in step (1), the vacuum degree ≤ 1×10 -3 Pa, and the temperature is 1200 - 1350 °C.

[0013] Further, the protective gas in steps (2 - 4) is argon or nitrogen.

[0014] Further, the distance between the nozzle and the cooling roller in step (4) is 0.2 mm - 0.4 mm, and the spraying speed of the nozzle is 20 - 25 m / s.

[0015] An application of a high-lamination iron-based amorphous wide strip is used to manufacture high-frequency transformer cores, magnetic cores for new energy vehicle drive motors, or power equipment for marine environments.

[0016] For the iron-based amorphous material obtained by the method of the present invention, the thickness of the strip is uniform and can be controlled within 25 ± 1 m.

[0017] Beneficial effects: By introducing the combined use of composite functional metal elements Gd, Nb, and V and the synergistic optimization of process parameters, the present invention significantly improves the lamination coefficient, magnetic properties, and corrosion resistance of the iron-based amorphous wide strip: First: The present invention adds appropriate amounts of B and Si elements to the iron-based material. As metalloid elements, B and Si can improve the amorphous formation ability of the iron-based amorphous soft magnetic alloy, enhance thermal stability, and at the same time control the microstructure. Among them, Si can reduce the average grain size, widen the temperature range of alloy heat treatment, and inhibit the precipitation of secondary phases such as Fe-(B) to increase thermal stability. The B element can play a role in stabilizing the amorphous phase and hindering the further growth of grains, thereby better controlling the grain size and the morphology of the amorphous state.

[0018] Secondly, composite functional metallic elements Gd, Nb, and V are introduced. The high oxidation activity of element Gd preferentially combines with O and N present in the melt, reducing the content of impurity elements, thereby suppressing the adverse effects of oxygen during the melting process, inhibiting heterogeneous nucleation, and improving the amorphous formation ability. The magnetostrictive effect of Gd synergistically anneals the alternating magnetic field to induce the arrangement of 180° magnetic domains, reducing the hysteresis loss. The 4f electron layer of Gd contains 7 unpaired electrons, forming a strong local magnetic moment, which generates an exchange coupling effect with the 3d electrons of Fe, significantly increasing the saturation magnetic induction intensity (Bs) of the material. Nb forms a high melting point NbB2 phase (melting point > 3000 °C) with B, effectively suppressing the coarsening of the Fe-B phase, refining the amorphous matrix, and reducing magnetic domain pinning. The solid solution strengthening effect of V increases the melt viscosity, delays the atomic diffusion at the solidification front, and refines the amorphous matrix. At the same time, Nb oxidizes on the surface to form a Nb2O5 film, blocking the - erosion path. The atomic radii of Nb, Gd, and V are matched (Gd 1.80 Å, Nb 1.45 Å, V 1.34 Å). After being mixed in equal proportions and pre-alloyed, the composition segregation is reduced, there are no longitudinal vertical stripes during the strip casting process, and the stacking factor is increased to 0.93 - 0.94. The three elements cooperate synergistically to effectively improve the comprehensive magnetic properties and corrosion resistance of the material.

[0019] Thirdly, the composite master alloy is pre-melted to ensure the uniform distribution of elements, reduce the composition segregation during the strip casting process, improve the material uniformity, and increase the stacking factor.

[0020] In summary, through the process optimization of rare earth-transition metal co-doping and pre-composite rare earth elements, the present invention has achieved a comprehensive improvement in the magnetic properties, stacking factor, and corrosion resistance of iron-based amorphous wide strips, with broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 XRD patterns of the strips obtained in Examples 1 - 3; Figure 2 High-resolution transmission electron microscope (HRTEM) images and selected area electron diffraction (SAED) patterns of the strip obtained in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0022] The technical solutions of the present invention will be further described below in conjunction with specific embodiments, but are not limited thereto.

[0023] Example 1 A high-stacking iron-based amorphous wide strip, according to the mass percentage, includes raw materials: B 2.25 wt%, Si 5.02 wt%, composite functional metallic elements 0.5%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%.

[0024] The composite functional metal elements are a combination of Gd, Nb, and V, and the mass ratio of the three is 1:1:1.

[0025] A preparation method of a high-lamination iron-based amorphous wide strip includes the following preparation steps: (1) Preparation of composite master alloy: The composite functional metal elements Gd, Nb, and V are mixed according to a mass ratio of 1:1:1 and melted in a vacuum induction furnace to form a uniform pre-alloy ingot, which is crushed to a particle size ≤ 1 mm and then used. (2) Melting: The raw materials except for the composite functional metal elements are proportioned by percentage and put into an intermediate frequency furnace for smelting. After all the raw materials are melted, the pre-alloy ingot obtained in step (1) is added, so that the final composition of the molten steel is controlled at B 2.25 wt%, Si 4.58 wt%, composite functional metal elements 0.5%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%; protective gas is flushed during melting to protect the molten steel; the heating temperature of the melting furnace is 1200 °C; the molten steel after complete melting is continuously smelted for 7 min under the action of electromagnetic stirring. (3) Heat preservation treatment: The intermediate holding ladle is evacuated, filled with protective gas, and the intermediate ladle is heated to 1300 °C. The molten alloy in step (2) is poured into the intermediate holding ladle, held at a constant temperature for 10 min, and the alloy liquid is held at a constant temperature of 1350 °C. (4) Spray strip: The alloy liquid after heat preservation in step (3) is poured into a spray strip package, and is sprayed onto a cooling copper roll through the nozzle of the spray strip package under protective gas to form an iron-based amorphous strip. (5) Annealing treatment: The continuous strip of amorphous alloy is placed in a vacuum annealing tunnel furnace, and is subjected to annealing and crystallization treatment under a transverse and longitudinal alternating magnetic field at 300 °C; after the annealed and crystallized strip passes through an alloy pair rolling mill, it is die-cut and packaged to obtain the final product.

[0026] During the melting in the vacuum induction furnace in step (1), the vacuum degree ≤ 1×10 -3 Pa, and the temperature is 1200 °C.

[0027] The protective gas in steps (2 - 4) is argon.

[0028] The distance between the nozzle and the cooling roll in step (4) is 0.2 mm, and the spraying speed of the nozzle is 20 m / s.

[0029] Example 2 A high-lamination iron-based amorphous wide strip, according to mass percentage, includes raw materials: B 2.35 wt%, Si 4.82 wt%, composite functional metal elements 1%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%.

[0030] The composite functional metal element is a combination of Gd, Nb and V, and the mass ratio of the three is 1:1:1.

[0031] A method for preparing a high-stack iron-based amorphous wide band comprises the following preparation steps: (1) Preparation of composite master alloy: The composite functional metal elements Gd, Nb and V are mixed in a mass ratio of 1:1:1 and smelted in a vacuum induction furnace to form a uniform pre-alloyed ingot, which is crushed to a particle size of ≤1 mm before use; (2) Melting: the raw materials except the composite functional metal element are mixed according to the percentage, put into the medium frequency furnace for smelting, and after all the raw materials are melted, the pre-alloyed ingot obtained in step (1) is added to make the composition of the molten steel finally controlled to be 2.35wt% of B, 4.80wt% of Si, 1% of the composite functional metal element, and the content of Al and Ti are both less than 50ppm, the balance is iron, and it contains inevitable trace impurity elements, and the total amount of impurity elements is ≤0.5%; during the smelting, the shielding gas is used to protect the molten steel; the heating temperature of the smelting furnace is 1350°C; the completely melted molten steel is further smelted for 7 minutes under the action of electromagnetic stirring; (3) Insulation treatment: the intermediate insulation bag is evacuated and filled with protective gas, and the intermediate bag is heated to 1350°C. The molten alloy in step (2) is poured into the intermediate insulation bag and kept at a constant temperature for 12 minutes to keep the alloy liquid at a constant temperature of 1350°C. (4) Spraying: The alloy liquid after the insulation in step (3) is injected into the spray bag, and sprayed onto the cooling copper roller through the nozzle of the spray bag under the protective gas to form an iron-based amorphous strip; (5) Annealing treatment: The amorphous alloy continuous strip is placed in a vacuum annealing tunnel furnace and subjected to annealing and crystallization treatment at 400°C in a magnetic field that alternates horizontally and vertically. The annealed and crystallized strip is passed through an alloy calender, and then die-cut and packaged to obtain the final product.

[0032] Step (1) Vacuum degree during vacuum induction furnace melting is ≤1×10 -3 Pa, temperature 1300℃.

[0033] The protective gas in step (2-4) is nitrogen.

[0034] In step (4), the distance between the nozzle and the cooling roller is 0.3 mm, and the spraying speed of the nozzle is 22 m / s.

[0035] Example 3 A high-laminated iron-based amorphous wide band comprises the following raw materials by mass percentage: 2.45wt% B, 4.58wt% Si, 1.5% composite functional metal elements, Al and Ti contents both less than 50ppm, the balance being iron, and containing inevitable trace impurity elements, with the total amount of impurity elements being ≤0.5%.

[0036] The composite functional metal elements are a combination of Gd, Nb, and V, and the mass ratio of the three is 1:1:1.

[0037] A method for preparing a high-lamination iron-based amorphous wide strip includes the following preparation steps: (1) Preparation of composite master alloy: The composite functional metal elements Gd, Nb, and V are mixed in a vacuum induction furnace according to a mass ratio of 1:1:1, melted to form a uniform pre-alloy ingot, and then crushed to a particle size of ≤1 mm for use. (2) Melting: The raw materials except the composite functional metal elements are proportioned by percentage and put into an intermediate frequency furnace for smelting. After all the raw materials are melted, the pre-alloy ingot obtained in step (1) is added, and the composition of the molten steel is finally controlled at B 2.45 wt%, Si 5.02 wt%, composite functional metal elements 1.5%, the contents of Al and Ti are both <50 ppm, and the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements is ≤0.5%; protective gas is flushed during melting to protect the molten steel; the heating temperature of the melting furnace is 1500 °C; the molten steel after complete melting is continuously melted for 10 min under the action of electromagnetic stirring. (3) Heat preservation treatment: The intermediate tundish is evacuated and filled with protective gas, and the tundish is heated to 1400 °C. The molten alloy in step (2) is poured into the intermediate tundish, kept at a constant temperature for 15 min, and the alloy liquid is kept at a constant temperature of 1450 °C. (4) Spray strip: The alloy liquid after heat preservation in step (3) is poured into a spray strip package and sprayed onto a cooling copper roll through the nozzle of the spray strip package under protective gas to form an iron-based amorphous strip. (5) Annealing treatment: The continuous strip of amorphous alloy is placed in a vacuum annealing tunnel furnace and subjected to annealing and crystallization treatment under a transverse and longitudinal alternating magnetic field at 400 °C; after the annealed and crystallized strip passes through an alloy pair rolling mill, it is then die-cut and packaged to obtain the final product.

[0038] During the melting in the vacuum induction furnace in step (1), the vacuum degree ≤1×10 -3 Pa, and the temperature is 1350 °C.

[0039] The protective gas in steps (2-4) is argon.

[0040] The distance between the nozzle and the cooling roll in step (4) is 0.4 mm, and the spraying speed of the nozzle is 25 m / s.

[0041] Comparative Example 1 In this comparative example, except that the element Gd is not used in the composite functional metal elements, the other raw materials and process steps are the same as those in Example 1. That is: A high-lamination iron-based amorphous wide strip, comprising raw materials by mass percentage: B 2.25 wt%, Si 4.58 wt%, composite functional metal elements 0.5%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%.

[0042] The composite functional metal elements are a combination of Nb and V, and the mass ratio is 1:1.

[0043] Comparative Example 2 In this comparative example, except that the element Nb is not used in the composite functional metal elements, the other raw materials and process steps are the same as those in Example 1. That is: A high-lamination iron-based amorphous wide strip, comprising raw materials by mass percentage: B 2.25 wt%, Si 4.58 wt%, composite functional metal elements 0.5%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%.

[0044] The composite functional metal elements are a combination of Gd and V, and the mass ratio is 1:1.

[0045] Comparative Example 3 In this comparative example, except that the element V is not used in the composite functional metal elements, the other raw materials and process steps are the same as those in Example 1. That is: A high-lamination iron-based amorphous wide strip, comprising raw materials by mass percentage: B 2.25 wt%, Si 4.58 wt%, composite functional metal elements 0.5%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%.

[0046] The composite functional metal elements are a combination of Gd and Nb, and the mass ratio is 1:1.

[0047] Comparative Example 4 In this comparative example, except that the proportional relationship of Gd, Nb and V is changed in the composite functional metal elements, the other raw materials and process steps are the same as those in Example 1. That is: A high-lamination iron-based amorphous wide strip, comprising raw materials by mass percentage: B 2.25 wt%, Si 4.58 wt%, composite functional metal elements 0.5%, the contents of Al and Ti are both < 50 ppm, the balance is iron, containing inevitable trace impurity elements, and the total amount of impurity elements ≤ 0.5%.

[0048] The composite functional metal elements are a combination of Gd, Nb and V, and the mass ratio of the three is 2:1:1.

[0049] Comparative Example 5 In this comparative example, except for changing the ratio of Gd, Nb and V in the composite functional metal element, the rest of the raw materials and process steps are the same as those in Example 1. That is: A high-laminated iron-based amorphous wide band comprises the following raw materials, in terms of mass percentage: B2.25wt%, Si4.58wt%, 0.5% of composite functional metal elements, Al and Ti contents both less than 50ppm, the balance being iron, and containing inevitable trace impurity elements, with the total amount of impurity elements being ≤0.5%.

[0050] The composite functional metal element is a combination of Gd, Nb and V, and the mass ratio of the three is 1:2:1.

[0051] Comparative Example 6 In this comparative example, except for changing the ratio of Gd, Nb and V in the composite functional metal element, the rest of the raw materials and process steps are the same as those in Example 1. That is: A high-laminated iron-based amorphous wide band comprises the following raw materials, in terms of mass percentage: B2.25wt%, Si4.58wt%, 0.5% of composite functional metal elements, Al and Ti contents both less than 50ppm, the balance being iron, and containing inevitable trace impurity elements, with the total amount of impurity elements being ≤0.5%.

[0052] The composite functional metal element is a combination of Gd, Nb and V, and the mass ratio of the three is 1:1:2.

[0053] Comparative Example 7 In this comparative example, except that the intermediate alloy is not compounded in advance, the rest of the raw materials and process steps are the same as those of Example 1. That is: A method for preparing a high-stack iron-based amorphous wide band comprises the following preparation steps: (1) Melting: The raw materials are mixed according to the percentage and put into the medium frequency furnace for smelting, so that the final composition of the molten steel is controlled to be B2.25wt%, Si4.58wt%, composite functional metal elements 0.5%, Al and Ti contents are both less than 50ppm, the balance is iron, and it contains inevitable trace impurity elements, and the total amount of impurity elements is ≤0.5%; during smelting, the protective gas is used to protect the molten steel; the heating temperature of the smelting furnace is 1200℃; the completely melted molten steel is further smelted for 7 minutes under the action of electromagnetic stirring; (2) Insulation treatment: the intermediate insulation bag is evacuated and filled with protective gas, and the intermediate bag is heated to 1300°C. The molten alloy in step (2) is poured into the intermediate insulation bag and kept at a constant temperature for 10 minutes until the alloy liquid is kept at a constant temperature of 1350°C. (3) Spraying: The alloy liquid after the insulation in step (2) is injected into the spray bag, and sprayed onto the cooling copper roller through the nozzle of the spray bag under the protective gas to form an iron-based amorphous strip; (4) Annealing treatment: Place the amorphous alloy continuous strip in a vacuum annealing tunnel furnace, and perform annealing crystallization treatment at 300 °C under a transverse and longitudinal alternating magnetic field; after passing the annealed and crystallized strip through an alloy pair rolling mill, it is then die-cut and packaged to obtain the final product.

[0054] Performance testing Conduct relevant tests on the obtained strip. Use an X-ray diffractometer (XRD) of model Rigaku D / max 2500 to detect the phase of the amorphous alloy strip. In addition, use a transmission electron microscope (TEM) of model FEI Tecnai G2 F20 to more finely characterize the microstructure of the strip.

[0055] The test results of the strip are as Figure 1 and Figure 2 shown, Figure 1 is the XRD pattern of the strip obtained in the example. The results show that the prepared alloy strip has a completely amorphous structure. Figure 2 is the high-resolution transmission electron microscope (HRTEM) image and selected area electron diffraction (SAED) pattern of the strip obtained in Example 1. The HRTEM photos and SAED patterns at the center and edge of the strip show typical maze-like atomic arrangement characteristics and diffraction halos of amorphous alloys, further proving the single-phase amorphous structure inside the strip.

[0056] For the magnetic properties, refer to GB / T 19346.3-2021. Use a vibrating sample magnetometer (VSM) of model Lake Shore 7407 VSM to measure the saturation magnetic induction intensity (Bs) of the sample, and the test magnetic field intensity is 800 kA / m. Use a BH hysteresis loop tester (MATS-2010SD) produced by Hunan Lianzhong Technology Co., Ltd. to measure the coercivity (Hc) of the strip sample, and the maximum magnetic field intensity during the test is 800 A / m. The lamination factor test refers to GB / T 19346.2-2017. The test results are shown in Table 1: Table 1 Performance test results

[0057] Electrochemical testing: The electrochemical workstation model used is CHI1660E, equipped with typical three electrodes: working electrode, reference electrode, and platinum electrode. The solution used in the experiment is a neutral solution with a composition of 0.6M NaCl, prepared using ultrapure water and analytical grade reagents. The non-test surface of the experimental sample strip is covered with epoxy resin 12 hours in advance to ensure that only the working surface is tested, and the test area is 0.1 cm 2, a saturated calomel electrode was selected as the reference electrode. The three-electrode electrolytic cell was placed in an electromagnetic shielding box to reduce the influence of large external fluctuations on the system during the experimental test. The potentiodynamic polarization data of the sample were measured by an electrochemical workstation to obtain the electrochemical parameters.

[0058] Table 2 Electrochemical parameters of the strip in the corrosion matrix

[0059] The experimental results show that the electrochemical performance of the examples is significantly better than that of the comparative examples, the corrosion potential of the strip is significantly increased, and the icorr value is lower, indicating that the material has stronger stability and better corrosion resistance in the corrosion environment. For Comparative Examples 1-7 with changed element compositions and preparation processes, their electrochemical performances decreased significantly, which shows that optimizing the element ratio and process parameters is crucial for improving the corrosion resistance of the material. Equivalent amounts of Gd, Nb, and V can produce a synergistic effect, effectively inhibiting the corrosion process and prolonging the service life of the material. However, Comparative Examples 1-7 changed the balanced synergistic effect of the three, resulting in weakened corrosion resistance.

[0060] It should be noted that the above examples are only some of the preferred embodiments for implementing the present invention, not all embodiments. Obviously, based on the above examples of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A high-stack iron-based amorphous wide band, characterized in that: The raw materials include: B2.25-2.45wt%, Si4.58-5.02wt%, composite functional metal elements 0.5-1.5%, Al and Ti contents are both less than 50ppm, the balance is iron, and it contains inevitable trace impurity elements, and the total amount of impurity elements is ≤0.5%.

2. The high-stack iron-based amorphous wide band according to claim 1, characterized in that: The content of the composite functional metal element is 1%.

3. The high-stack iron-based amorphous wide band according to claim 1, characterized in that: The composite functional metal element is a combination of Gd, Nb and V, and the mass ratio of the three is 1:1:

1.

4. A method for preparing the high-laminated iron-based amorphous wide band according to any one of claims 1 to 3, characterized in that: The method comprises the following preparation steps: (1) Preparation of composite master alloy: The composite functional metal elements Gd, Nb and V are mixed in a mass ratio of 1:1:1 and smelted in a vacuum induction furnace to form a uniform pre-alloyed ingot, which is crushed to a particle size of ≤1 mm before use; (2) Melting: the raw materials except the composite functional metal element are mixed according to the percentage, put into the medium frequency furnace for smelting, and after all the raw materials are melted, the pre-alloyed ingot obtained in step (1) is added to make the composition of the molten steel finally controlled to be B2.25-2.45wt%, Si4.58-5.02wt%, composite functional metal element 0.5-1.5%, Al and Ti content both less than 50ppm, the balance is iron, and it contains inevitable trace impurity elements, the total amount of impurity elements is ≤0.5%; during smelting, the molten steel is protected by a protective gas; the heating temperature of the smelting furnace is 1200-1500°C; the completely melted molten steel is further smelted for 7-10min under the action of electromagnetic stirring; (3) Insulation treatment: the intermediate insulation bag is evacuated and filled with protective gas, and the intermediate bag is heated to 1300-1400°C. The molten alloy in step (2) is poured into the intermediate insulation bag and kept at a constant temperature for 10-15 minutes until the alloy liquid is kept at a constant temperature of 1350-1450°C. (4) Spraying: The alloy liquid after the insulation in step (3) is injected into the spray bag, and sprayed onto the cooling copper roller through the nozzle of the spray bag under the protective gas to form an iron-based amorphous strip; (5) Annealing treatment: The amorphous alloy continuous strip is placed in a vacuum annealing tunnel furnace and subjected to a horizontal and vertical staggered magnetic field at 300-400°C for annealing and crystallization treatment; the annealed and crystallized strip is passed through an alloy calender, and then die-cut and packaged to obtain the final product.

5. The method for preparing high-laminated iron-based amorphous wide band according to claim 4, characterized in that: Step (1) Vacuum degree during vacuum induction furnace melting is ≤1×10 -3 Pa, temperature 1200-1350℃.

6. The method for preparing high-stack iron-based amorphous wide band according to claim 4, characterized in that: In steps (2) to (4), the protective gas is argon or nitrogen.

7. The method for preparing high-stack iron-based amorphous wide band according to claim 4, characterized in that: In step (4), the distance between the nozzle and the cooling roller is 0.2 mm-0.4 mm, and the spraying speed of the nozzle is 20-25 m / s.

8. An application of the high-stack iron-based amorphous wide band according to any one of claims 1 to 3, characterized in that: Used to manufacture high-frequency transformer cores, new energy vehicle drive motor cores or electrical equipment for marine environments.

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