Amorphous soft magnetic alloy material, amorphous soft magnetic alloy core and preparation method

Abstract

The present invention provides an amorphous soft magnetic alloy material, an amorphous soft magnetic alloy iron core and a preparation method thereof. The atomic chemical expression of the components of the alloy material is: Fe a Si b Al c V d Mn e Cr f B x Mg y N h O i Wherein, 80≤a≤85, 3≤b≤5, 1≤c≤3, 0.5≤d≤1.5, 1≤e≤2, 1≤f≤2, 3≤x≤5, 0.5≤y≤1.5, 0.5≤h≤1.0, 0.1≤i≤0.3, and a+b+c+d+e+f+x+y+h+i=100. This amorphous soft magnetic alloy material has high saturation magnetic induction intensity and magnetic permeability, can significantly reduce eddy current loss at high frequencies, and has good mechanical properties and corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of soft magnetic alloy manufacturing, and specifically provides an amorphous soft magnetic alloy material, an amorphous soft magnetic alloy iron core and a preparation method. Background Art

[0002] The performance of soft magnetic materials significantly impacts the efficiency and lifespan of devices used in high-efficiency power transmission, stepper motors, transformers, and inductors. Traditional soft magnetic materials (such as silicon steel and iron-nickel alloys) perform well in low-frequency applications, but their performance is limited in high-frequency and high-magnetic-field applications due to high eddy current and hysteresis losses. Furthermore, while traditional amorphous soft magnetic alloys offer excellent permeability and low losses, their relatively low saturation magnetic induction limits their widespread use in high-power and high-magnetic-field applications.

[0003] To solve these problems, researchers have been trying to optimize the chemical composition and smelting process to develop amorphous soft magnetic alloys with high saturation magnetic induction, low loss and excellent mechanical properties to improve the comprehensive performance. Although the magnetic and mechanical properties can be improved to a certain extent by adding some alloying elements such as silicon, aluminum, and vanadium.

[0004] However, there are still bottlenecks in the existing technologies in further improving the saturation magnetic induction intensity, reducing high-frequency losses, and improving mechanical strength and ductility. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of poor comprehensive performance of existing amorphous soft magnetic alloy materials.

[0006] The purpose of the present invention is to adopt the following technical solutions to achieve:

[0007] The present invention provides an amorphous soft magnetic alloy material, wherein the atomic chemical expression of the components of the alloy material is:

[0008] Fe a Si b Al c V d Mn e Cr f B x Mg y N h O i ; In the formula, 80≤a≤85, 3≤b≤5, 1≤c≤3, 0.5≤d≤1.5, 1≤e≤2, 1≤f≤2, 3≤x≤5, 0.5≤y≤1.5, 0.5≤h≤1.0, 0.1≤i≤0.3, and a+b+c+d+e+f+x+y+h+i=100.

[0009] Based on the same inventive concept, the present invention also provides a method for preparing an amorphous soft magnetic alloy material, comprising:

[0010] Preparation of raw materials: weighing raw materials of various elements according to the composition ratio of the amorphous soft magnetic alloy material, wherein the elements iron, silicon, aluminum, vanadium, manganese, and chromium are introduced in the form of simple substances, and the remaining elements are introduced in the form of boron-magnesium compounds, nitrides, and oxides; first stage smelting: placing the raw materials except the boron-magnesium compound into a high-frequency induction melting furnace, heating the melting temperature to 1500° C.-1600° C. under argon protection, and smelting for 5 min-10 min to form a primary melt;

[0011] The second stage of melting: after the melting temperature is lowered to 1300-1400°C, the boron magnesium compound is added to the primary melt and stirred for 5-10 minutes to obtain a secondary melt; solidification cooling: under the protection of argon, when the secondary melt is allowed to stand to a semi-solid state, high-pressure water quenching or gas cooling is used to form the amorphous soft magnetic alloy material, and the cooling rate is 10 4 K / s-10 5 K / s.

[0012] Preferably, the boron-magnesium compound is Mg2B2O5, and the boron-magnesium compound is added as a reaction material in the second stage smelting.

[0013] Preferably, the amount of the boron magnesium compound added is 0.1%-0.3% of the total mass of the raw materials.

[0014] Preferably, the nitride is AlN; and the oxide is at least one of B2O3 and Al2O3.

[0015] Based on the same inventive concept, the present invention also provides a method for preparing an amorphous soft magnetic alloy core, which comprises the following steps: grinding treatment: taking an alloy block of the amorphous soft magnetic alloy material and mechanically grinding it in a cooling environment to form amorphous particles, and using deionized water to clean the amorphous particles to remove surface impurities and oxides; pre-pressing and forming: placing the cleaned amorphous particles into a mold and pre-pressing them under heating conditions to obtain pre-pressed alloy sheets; densification treatment: subjecting the pre-pressed alloy sheets to hot isostatic pressing to form dense alloy sheets; rolling and stacking treatment: fine-rolling the dense alloy sheets in a rolling mill to obtain rolled alloy sheets, and cutting the rolled alloy sheets and stacking them to form laminates; annealing treatment: subjecting the laminates to spray annealing treatment in a high-frequency magnetic field; surface treatment and assembly: ultrasonically polishing the annealed surface of the laminates, coating an insulating layer on the surface of the laminates, and then assembling the laminates into an amorphous soft magnetic alloy core.

[0016] Preferably, during the grinding process, the particle size of the amorphous particles is less than 20 μm.

[0017] Preferably, during the grinding process, the temperature of the cooling environment does not exceed -40°C.

[0018] Preferably, in the pre-pressing molding, the hot pressing temperature of the pre-pressing molding is 400° C.-600° C., and the hot pressing pressure is 3000 MPa-5000 MPa.

[0019] Preferably, in the pre-pressing forming, the thickness of the pre-pressed alloy sheet is 0.03 mm to 0.04 mm.

[0020] Preferably, in the densification treatment, the temperature of the hot isostatic pressing is 500° C.-600° C., the pressure of the hot isostatic pressing is 80 MPa-120 MPa, and the holding time of the hot isostatic pressing is 20 min-30 min.

[0021] Preferably, in the rolling and stacking process, the thickness of the rolled alloy sheet is 0.01 mm to 0.014 mm, and the thickness of the laminate is 1 cm to 20 cm.

[0022] Preferably, in the annealing treatment, the magnetic field intensity is 50 mT-200 mT, the annealing temperature is 250° C.-450° C., and the annealing time is 1 h-2 h.

[0023] Preferably, in the surface treatment and assembly, the ultrasonic frequency is 20kHz-40kHz, and the polishing time is 10min-20min.

[0024] Based on the same inventive concept, the present invention also provides an amorphous soft magnetic alloy core, which is manufactured using the aforementioned method for preparing an amorphous soft magnetic alloy core.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The amorphous soft magnetic alloy material provided by the present invention has a component atomic chemical expression as follows:

[0027] Fe a Si b Al c V d Mn e Cr f B x Mg y N h O iWherein, 80≤a≤85, 3≤b≤5, 1≤c≤3, 0.5≤d≤1.5, 1≤e≤2, 1≤f≤2, 3≤x≤5, 0.5≤y≤1.5, 0.5≤h≤1.0, 0.1≤i≤0.3, and a+b+c+d+e+f+x+y+h+i=100. This amorphous soft magnetic alloy material has high saturation magnetic induction intensity and magnetic permeability, can significantly reduce eddy current loss at high frequencies, and has good mechanical properties and corrosion resistance. DETAILED DESCRIPTION

[0028] The following examples are provided for a better understanding of the present invention and are not intended to limit the best mode of implementation. They do not limit the content and scope of protection of the present invention. Any product identical or similar to the present invention obtained by anyone under the guidance of the present invention or by combining the features of the present invention with other prior arts shall fall within the scope of protection of the present invention.

[0029] If no specific experimental steps or conditions are specified in the present invention, the experimental steps or conditions can be carried out according to the conventional experimental steps or conditions described in the literature in the art.

[0030] The present invention provides an amorphous soft magnetic alloy material, wherein the atomic chemical expression of the components of the alloy material is:

[0031] Fe a Si b Al c V d Mn e Cr f B x Mg y N h O i Wherein, 80≤a≤85, 3≤b≤5, 1≤c≤3, 0.5≤d≤1.5, 1≤e≤2, 1≤f≤2, 3≤x≤5, 0.5≤y≤1.5, 0.5≤h≤1.0, 0.1≤i≤0.3, and a+b+c+d+e+f+x+y+h+i=100. a, b, c, d, e, f, x, y, h, and i are the atomic percentages of the corresponding elements.

[0032] In the alloy material of the invention, iron is the matrix element of the soft magnetic alloy, contributing to the alloy's high magnetic permeability and high saturation magnetic flux density. Iron forms a favorable magnetic flux path within the amorphous structure, reducing coercivity and magnetic losses, particularly helping to improve the alloy's magnetic permeability in high-frequency applications. Within the atomic percentage range of 80 ≤ a ≤ 85, a higher iron content helps maintain the amorphous structure while improving the material's mechanical strength and ductility. Iron contents below this range result in reduced saturation magnetic flux density, while those above this range deteriorate the soft magnetic properties and significantly increase the alloy's losses and coercivity.

[0033] The addition of silicon to the invented alloy significantly improves the alloy's resistivity and high-frequency performance, effectively reducing eddy current losses. Within the atomic percentage range of 3 ≤ b ≤ 5, silicon, as an amorphous-forming element, effectively inhibits grain growth, promotes the formation of an amorphous structure, and improves the alloy's soft magnetic properties. It also enhances the material's oxidation and corrosion resistance, making it more stable in harsh environments. A silicon content greater than 5% decreases the alloy's saturation magnetic induction intensity, while a silicon content less than 3% reduces the alloy's amorphous-forming ability and deteriorates its magnetic properties.

[0034] In the invented alloy material, aluminum reacts with magnesium during the smelting process to form a magnesium-aluminum compound (such as MgAl2O4). This compound effectively refines grains and promotes the formation of nanocrystals. Within the atomic percentage range of 1 ≤ c ≤ 3, it helps improve the alloy's ductility and workability, facilitating subsequent forming and lamination. Furthermore, adding aluminum within this range improves the alloy's oxidation resistance and extends the life of the iron core. However, an aluminum content greater than 3% can lead to a decrease in the alloy's saturation magnetic induction.

[0035] In the invented alloy, vanadium effectively increases magnetic permeability while maintaining good magnetic properties at high temperatures. Within the atomic percentage range of 0.5 ≤ d ≤ 1.5, the addition of vanadium improves the alloy's high-temperature stability, resulting in greater performance stability during heat treatment and high-temperature applications. However, a vanadium content greater than 1.5 decreases the alloy's saturation magnetic induction and narrows the heat treatment window.

[0036] In the invented alloy material, manganese enhances the alloy's ductility, improving its mechanical properties and machinability. Within the atomic percentage range of 1 ≤ e ≤ 2, manganese contributes to grain refinement in the amorphous alloy, enhancing soft magnetic properties and saturation magnetic induction. It also improves the alloy's corrosion resistance, making it suitable for high-humidity or corrosive environments. A manganese content greater than 2 increases the alloy's grain size, deteriorating performance and increasing brittleness.

[0037] In the invented alloy material, chromium, as a corrosion-resistant element, significantly improves the alloy's stability in humid or oxidizing environments. Within the atomic percentage range of 1 ≤ f ≤ 2, chromium helps reduce hysteresis losses while improving the core's high-frequency magnetic properties. It also refines grains in the amorphous structure, enhancing soft magnetic properties. Chromium content greater than 2 atomic percent decreases the alloy's saturation magnetic induction.

[0038] In the alloy material of the invention, oxygen is introduced in the form of oxides (such as B2O3, Al2O3), which can form a nano-scale oxide composite phase in the alloy. When its atomic percentage value is in the range of 0.1≤i≤0.3, it has the effect of stabilizing the amorphous structure and refining the grains. At the same time, the presence of the oxide composite phase in this range can enhance the material's oxidation resistance and improve the alloy's durability and high-temperature stability. If the oxygen content is greater than 0.3, the alloy will be more susceptible to oxidation and become brittle.

[0039] In the alloy material of the invention, by adding nitrides (such as AlN), nitrogen can react with other elements in the alloy during the smelting process to form a nanocrystalline nitride composite phase. When its atomic percentage value is in the range of 0.5≤h≤1.0, it can further refine the grains while optimizing the microstructure of the alloy, reducing magnetic losses and improving the magnetic permeability and saturation magnetic induction intensity of the alloy.

[0040] In the invented alloy material, boron is a key element that promotes the formation of an amorphous structure and significantly enhances the alloy's soft magnetic properties. Within the range of 3 ≤ x ≤ 5, the composite phase (such as MgB2) formed when boron reacts with magnesium and aluminum can further refine the grain size, enhancing the alloy's high saturation magnetic induction intensity while reducing the kinetic energy of the magnetic domain walls and improving the alloy's magnetic permeability. However, if the boron content exceeds 5, the alloy's soft magnetic properties will deteriorate.

[0041] In the invented alloy material, magnesium generates magnesium-boron compound (MgB2) and magnesium-aluminum compound (MgAl2O4) in the reaction with boron and aluminum. When the atomic percentage value of these two composite phases is within the range of 0.5≤y≤1.5, they can refine the grains and increase the saturation magnetic induction intensity. At the same time, within this range, the magnesium element also has high ductility, which helps to enhance the mechanical strength and machinability of the iron core in the alloy. If the magnesium content is greater than 1.5, the saturation magnetic induction intensity of the alloy will decrease, and the grains will be difficult to refine.

[0042] Based on the same inventive concept, the present invention also provides a method for preparing an amorphous soft magnetic alloy material, comprising:

[0043] I. Raw Materials: Weigh the raw materials of each element according to the composition ratio of the amorphous soft magnetic alloy material described above. Iron, silicon, aluminum, vanadium, manganese, and chromium are introduced as elemental elements, and the remaining elements are introduced as boron-magnesium compounds, nitrides, and oxides. The purity of the raw materials should be greater than 99.9%. The nitride should be AlN; the oxide should be at least one of B2O3 and Al2O3.

[0044] II. First stage melting: Place the raw materials except the boron magnesium compound into a high-frequency induction melting furnace. Under argon protection, heat the melting temperature to 1500-1600°C for 5-10 minutes to form a primary melt.

[0045] III. Second Stage Melting: After lowering the melting temperature to 1300-1400°C, a boron-magnesium compound is added to the primary melt and stirred for 5-10 minutes to produce a secondary melt. The boron-magnesium compound is Mg2B2O5, and is added as a reactant in the second stage melting. The amount of boron-magnesium compound added is 0.1%-0.3% of the total mass of the raw materials. The second stage melting process ensures sufficient reaction between magnesium, boron, and aluminum to produce nano-sized magnesium boride and magnesium aluminide.

[0046] IV. Solidification cooling: Under argon protection, when the secondary melt is allowed to stand to a semi-solid state, high-pressure water quenching or gas cooling is used to form an amorphous soft magnetic alloy material, with a cooling rate of 10 4 K / s-10 5 K / s.

[0047] Based on the same inventive concept, the present invention also provides a method for preparing an amorphous soft magnetic alloy core, the preparation method comprising the following steps:

[0048] 1) Grinding treatment: Take the alloy block of amorphous soft magnetic alloy material and grind it into amorphous particles by mechanical grinding in a cooling environment. Use deionized water to clean the amorphous particles to remove surface impurities and oxides.

[0049] In this step, the particle size of the amorphous particles is less than 20 μm, and liquid nitrogen or dry ice is used to ensure that the temperature of the cooling environment does not exceed -40°C.

[0050] 2) Pre-pressing: The cleaned amorphous particles are placed in a mold and pre-pressed under heating conditions to obtain pre-pressed alloy sheets.

[0051] In this step, the hot pressing temperature of the pre-pressing is 400°C-600°C, and the hot pressing pressure is 3000MPa-5000MPa, to ensure that the amorphous particles are tightly bonded and formed after pressing. The thickness of the pre-pressed alloy sheet is 0.03mm-0.04mm.

[0052] 3) Densification treatment: The pre-pressed alloy sheet is subjected to hot isostatic pressing to form a dense alloy sheet.

[0053] In this step, a hot isostatic press is used to further improve the density and uniformity of the pre-pressed alloy sheet. The hot isostatic pressing temperature is 500°C-600°C, the hot isostatic pressing pressure is 80MPa-120MPa, and the hot isostatic holding time is 20min-30min.

[0054] 4) Rolling and stacking: The dense alloy sheet is finely rolled in a rolling mill to obtain a rolled alloy sheet, which is then cut and stacked to form a laminate.

[0055] In this step, the thickness of the rolled alloy sheet is 0.01 mm to 0.014 mm, and the thickness of the laminate is 1 cm to 20 cm.

[0056] 5) Annealing: The laminate is spray-annealed in a high-frequency magnetic field to promote the formation and homogenization of the nanocrystalline phase, thereby improving the magnetic permeability and soft magnetic properties. The magnetic field intensity is 50mT-200mT, the annealing temperature is 250°C-450°C, and the annealing time is 1h-2h.

[0057] 6) Surface treatment and assembly: The surface of the annealed laminations is ultrasonically polished to improve the surface smoothness and low-loss characteristics of the laminations; an insulating layer is coated on the surface of the laminations to avoid interlayer eddy current loss and improve the high-frequency performance of the core. The laminations are then assembled into an amorphous soft magnetic alloy core according to design requirements.

[0058] In this step, the ultrasonic frequency is 20kHz-40kHz, and the polishing time is 10min-20min.

[0059] Based on the same inventive concept, the present invention also provides an amorphous soft magnetic alloy core, which is manufactured using the above-mentioned method for preparing the amorphous soft magnetic alloy core.

[0060] Examples 1-10 and Comparative Examples 1-3

[0061] The samples of Examples 1-10 of the present invention respectively selected the element ratios of the amorphous soft magnetic alloy materials and the preparation process parameters of the alloy materials and the iron core in the above-mentioned different ranges, and the samples of Comparative Examples 1-3 respectively selected the alloy materials available on the market.

[0062] Table 1 is a comparison table of alloy element content of samples of Examples 1-10 of the present invention and samples of Comparative Examples 1-3.

[0063] Table 1

[0064]

[0065] Among them, Table 2 is a comparison table of preparation process parameters of samples in Examples 1-10 of the present invention.

[0066] Table 2

[0067]

[0068] Test results

[0069] Test environment: All examples and comparative examples were tested at room temperature (about 25°C).

[0070] Test equipment: Standard magnetic test equipment and mechanical property test equipment are used.

[0071] Test sample size: The thickness of the sample is 1cm-20cm.

[0072] Among them, the measured magnetic test parameters are as follows:

[0073] Saturation magnetic induction intensity (Bs): measured by a soft magnetic DC measuring device in a magnetic field of 1000A / m, the unit is Tesla (T).

[0074] Initial magnetic permeability (μ): The magnetic permeability measured at 0.8 A / m by a soft magnetic DC measuring device. The unit is dimensionless.

[0075] Coercive force (Hc): Measured by a soft magnetic DC measuring device in a magnetic field of 1000A / m. It tests the material's resistance to demagnetization. The unit is ampere / meter (A / m).

[0076] Loss (P): Hysteresis loss measured at different frequencies using a soft magnetic AC measuring device. The unit is watts per kilogram (W / kg). The losses are tested at 1kHz / 1.7T, 10kHz / 1.7T, and 100kHz / 1.7T respectively.

[0077] The test parameters for measuring mechanical properties are as follows:

[0078] Hardness (HV): Vickers hardness test, unit is HV.

[0079] Tensile strength (σ): The tensile strength of the test material, measured in megapascals (MPa).

[0080] Ductility (δ): The ductility of the material in %.

[0081] Density (ρ): The density of a material in grams per cubic centimeter (g / cm³).

[0082] Table 3

[0083]

[0084] Relevant performance tests were conducted on 10 samples of Examples 1-10 and 3 samples of Comparative Examples 1-3 (three existing products on the market), a total of 13 samples. The test comparison results of the 13 samples are shown in Table 3.

[0085] Table 3 is a summary comparison table of the magnetic and mechanical property test results of the samples of Examples 1-10 and Comparative Examples 1-3.

[0086] Result Analysis

[0087] 1. Saturation magnetic induction intensity (Bs)

[0088] As can be seen from Table 3, the saturation magnetic flux density of samples tested in Examples 1-10 of the present invention ranged from 1.92 T to 1.98 T, significantly higher than the 1.85 T to 1.87 T magnetic flux density of existing products (Samples 11-13 of Comparative Examples 1-3). This is because the addition of magnesium-boron compounds to the alloy and the optimization of the smelting process effectively enhance the saturation magnetic flux density of the alloy material. The resulting alloy material exhibits higher magnetic properties under high magnetic field conditions, which enables the amorphous soft magnetic alloy core prepared in the present invention to perform better in high-power motor and transformer applications.

[0089] 2. Initial magnetic permeability (μ)

[0090] As can be seen in Table 3, the initial magnetic permeabilities of samples in Examples 1-10 of the present invention ranged from 75,500 to 78,500, significantly higher than those of existing product samples 11-13. This is because the uniform distribution of the nanocrystalline phase and the stability of the composite phase obtained in the alloy material of the present invention improve the magnetic permeability, resulting in the alloy material having excellent magnetic permeability properties in low magnetic fields, which facilitates rapid magnetization and efficient energy transfer of the iron core in low-frequency and high-frequency applications.

[0091] 3. Coercive force (Hc)

[0092] As can be seen from Table 3, the coercive forces of samples of Examples 1-10 of the present invention are between 2.7 A / m and 3.0 A / m, which are significantly lower than the 3.4 A / m to 3.6 A / m of samples 11-13 of existing products.

[0093] Those skilled in the art will recognize that lower coercivity means the alloy consumes less energy during magnetization and demagnetization, which is crucial for improving the efficiency of soft magnetic alloys. Therefore, the low coercivity of the alloy material of the present invention indicates greater sensitivity and controllability in magnetic properties, enabling better application in corresponding magnetic products.

[0094] 4. Loss (P)

[0095] As can be seen from Table 3, the power losses of samples in Examples 1-10 of the present invention at 1 kHz / 1.7 T, 10 kHz / 1.7 T, and 100 kHz / 1.7 T are respectively less than 14 W / kg, less than 27 W / kg, and less than 50 W / kg, which are all lower than those of existing products 1-3.

[0096] This is because the low loss of the alloy material of the present invention is due to the refined grains and nanocrystalline composite phase, which helps reduce hysteresis loss and eddy current loss at high frequencies. Therefore, the lower high-frequency loss enables the alloy material of the present invention to perform better in high-frequency transformers and inductors.

[0097] 5. Mechanical properties

[0098] Hardness (HV):

[0099] As can be seen from Table 3, the hardness of the samples of Examples 1-10 of the present invention tested is between 650HV and 670HV, which is higher than that of the existing product samples 11-13 (615HV-625HV).

[0100] Tensile strength (σ):

[0101] The tensile strength of samples in Examples 1-10 of the present invention was tested to be between 585 MPa and 605 MPa, which is higher than that of existing product samples 11-13 (555 MPa-565 MPa).

[0102] Ductility (δ): The ductility of samples 1-10 of Examples of the present invention was between 2.9% and 3.3%, which was higher than that of samples 11-13 of the existing product (2.6%-2.8%).

[0103] From the comparison of the above data, it can be seen that the higher hardness and tensile strength show that the wear resistance and strength of the alloy are improved, while the ductility improves the forming performance of the alloy material.

[0104] Therefore, the improvement of mechanical properties makes the alloy material more advantageous in high-strength applications and core forming of complex structures.

[0105] In summary, the alloy material and core produced by the present invention significantly outperform existing products in both magnetic and mechanical properties, particularly in terms of high saturation magnetic induction, low coercivity, low high-frequency loss, and high hardness and tensile strength. These improved properties make the amorphous soft magnetic alloy core of the present invention more suitable for applications such as high-efficiency motors, transformers, and inductors.

[0106] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for preparing an amorphous soft magnetic alloy material, characterized in that: The atomic chemical expression of the components of the alloy material is: Fe a Si b Al c V d Mn e Cr f B x Mg y N h O i ; Where, 80≤a≤85, 3≤b≤5, 1≤c≤3, 0.5≤d≤1.5, 1≤e≤2, 1≤f≤2, 3≤x≤5, 0.5≤y≤1.5, 0.5≤h≤1.0, 0.1≤i≤0.3, and a+b+c+d+e+f+x+y+h+i=100; The preparation method comprises: Preparation of raw materials: weighing the raw materials of each element according to the composition ratio of the alloy material, wherein the elements iron, silicon, aluminum, vanadium, manganese and chromium are introduced in the form of single substances, and the remaining elements are introduced in the form of boron magnesium compounds, nitrides and oxides; The first stage of melting: placing the raw materials except the boron magnesium compound into a high-frequency induction melting furnace, heating the melting temperature to 1500-1600°C under argon protection, and melting for 5-10 minutes to form a primary melt; Second stage smelting: after lowering the smelting temperature to 1300° C.-1400° C., adding the boron magnesium compound to the primary melt and stirring for 5 min-10 min to obtain a secondary melt; Solidification cooling: Under argon protection, when the secondary melt is allowed to stand to a semi-solid state, high-pressure water quenching or gas cooling is used to form the amorphous soft magnetic alloy material, with a cooling rate of 10 4 K / s-10 5 K / s.

2. The method for preparing an amorphous soft magnetic alloy material according to claim 1, wherein: The boron-magnesium compound is Mg2B2O5, and the boron-magnesium compound is added as a reaction material in the second stage smelting.

3. The method for preparing an amorphous soft magnetic alloy material according to claim 1, wherein: The amount of the boron magnesium compound added is 0.1%-0.3% of the total mass of the raw materials.

4. The method for preparing an amorphous soft magnetic alloy material according to claim 1, wherein: The nitride is AlN; the oxide is at least one of B2O3 and Al2O3.

5. A method for preparing an amorphous soft magnetic alloy core, characterized in that: The preparation method comprises the following steps: Grinding treatment: taking the alloy block prepared by the preparation method of the amorphous soft magnetic alloy material according to claim 1 and processing it into amorphous particles by mechanical grinding in a cooling environment, and washing the amorphous particles with deionized water to remove surface impurities and oxides; Pre-pressing: placing the cleaned amorphous particles into a mold and pre-pressing them under heating conditions to obtain pre-pressed alloy sheets; Densification treatment: subjecting the pre-pressed alloy sheet to hot isostatic pressing to form a dense alloy sheet; Rolling and stacking treatment: finely rolling the dense alloy sheet in a rolling mill to obtain a rolled alloy sheet, and then cutting the rolled alloy sheet and stacking and fixing it to form a laminate; Annealing treatment: performing a spray annealing treatment on the laminate in a high-frequency magnetic field; Surface treatment and assembly: After the annealed lamination surface is subjected to ultrasonic polishing, an insulating layer is coated on the surface of the lamination, and then the laminations are assembled into an amorphous soft magnetic alloy core.

6. The method for preparing an amorphous soft magnetic alloy core according to claim 5, characterized in that: During the grinding process, the particle size of the amorphous particles is less than 20 μm.

7. The method for preparing an amorphous soft magnetic alloy core according to claim 5, wherein: During the grinding process, the temperature of the cooling environment does not exceed -40°C.

8. The method for preparing an amorphous soft magnetic alloy core according to claim 5, wherein: In the pre-pressing molding, the hot pressing temperature of the pre-pressing molding is 400° C.-600° C., and the hot pressing pressure is 3000 MPa-5000 MPa.

9. The method for preparing an amorphous soft magnetic alloy core according to claim 5, characterized in that: In the pre-pressing forming, the thickness of the pre-pressed alloy sheet is 0.03 mm to 0.04 mm.

10. The method for preparing an amorphous soft magnetic alloy core according to claim 5, characterized in that: In the densification treatment, the temperature of the hot isostatic pressing is 500° C.-600° C., the pressure of the hot isostatic pressing is 80 MPa-120 MPa, and the holding time of the hot isostatic pressing is 20 min-30 min.

11. The method for preparing an amorphous soft magnetic alloy core according to claim 5, wherein: In the rolling and stacking process, the thickness of the rolled alloy sheet is 0.01 mm to 0.014 mm, and the thickness of the laminate is 1 cm to 20 cm.

12. The method for preparing an amorphous soft magnetic alloy core according to claim 5, characterized in that: In the annealing process, the magnetic field intensity is 50 mT-200 mT, the annealing temperature is 250° C.-450° C., and the annealing time is 1 h-2 h.

13. The method for preparing an amorphous soft magnetic alloy core according to claim 5, characterized in that: In the surface treatment and assembly, the ultrasonic frequency is 20kHz-40kHz, and the polishing time is 10min-20min.

14. An amorphous soft magnetic alloy core, characterized in that: The iron core is made by the preparation method of the amorphous soft magnetic alloy iron core according to any one of claims 5 to 13.

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