Iron-based amorphous nanocrystalline soft magnetic alloy material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of soft magnetic materials, and provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method and application thereof. The chemical component expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is FeaSibBcPdCueCf, subscripts a, b, c, d, e and f respectively represent the atomic percentage contents of corresponding elements, and the following conditions are met: a = 83.3%, b = 4%, c is more than or equal to 4% and less than or equal to 8%, d = 4%, e = 0.7%, and f is more than or equal to 0% and less than or equal to 4%, and a + b + c + d + e + f = 100%. On one hand, expensive metal elements are avoided, and the production cost is effectively reduced; on the other hand, after C is introduced to replace B, better amorphous forming ability and a larger heat treatment window are achieved, more accurate control over the heat treatment temperature is facilitated, and the iron-based amorphous nanocrystalline soft magnetic alloy material with high Bs and low Hc is prepared.

Description

Technical Field

[0001] The present invention relates to the technical field of soft magnetic materials, and in particular to an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method and application thereof. Background Art

[0002] Soft magnetic materials play a vital role in the production, transmission, and storage of energy, and are key materials for achieving efficient energy conversion. However, in existing iron-based amorphous nanocrystalline alloy systems, the long-standing trade-off between saturated magnetic flux density (Bs) and coercivity (Hc) poses a major challenge. Typically, higher Bs is often accompanied by higher Hc, and vice versa, making it difficult for such materials to simultaneously meet the dual requirements of high Bs and low Hc in industrial applications.

[0003] Taking the first generation of Fe-Si-B-Nb-Cu alloy developed by Yoshizawa et al. as an example, although it performs well in high-frequency performance, its Bs is relatively low, only about 1.24T. In contrast, the Fe-(Zr, Hf, Nb, Ti, W)-B-Cu alloy developed by Suzuki et al. achieved a higher Bs, between 1.5T and 1.7T, but due to the introduction of easily oxidized elements, it is more difficult to prepare and difficult to maintain stability in the air. Willard et al. increased Bs to about 1.61T by adding Co elements. This improvement increased the cost of the alloy and also caused Hc to increase significantly to 10A / m. In addition, the Fe-Si-BP-Cu system developed by Makino et al., while maintaining a higher Bs, also faces the challenges of low amorphous forming ability and harsh heat treatment process.

[0004] In summary, in order to achieve high Bs, it is often necessary to sacrifice Hc; and to reduce Hc, it may be necessary to sacrifice Bs or other performance indicators. How to break this trade-off relationship and develop a new generation of soft magnetic alloys with high Bs, low Hc and excellent high-frequency performance is still a major challenge to be solved in the current field of materials science. Summary of the invention

[0005] Therefore, the present invention provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method and application thereof, aiming to solve the shortcomings of the prior art of iron-based amorphous nanocrystalline soft magnetic alloy materials. On the one hand, expensive metal elements are avoided, effectively reducing the production cost; on the other hand, by introducing C to replace B, it has better amorphous forming ability and a larger heat treatment window, which is conducive to more accurate control of the heat treatment temperature and promotes industrial production, thereby obtaining more excellent soft magnetic properties and preparing an iron-based amorphous nanocrystalline soft magnetic alloy material with both high Bs and low Hc.

[0006] In order to solve the above problems, the first object of the present invention is to provide an iron-based amorphous nanocrystalline soft magnetic alloy material;

[0007] The second object of the present invention is to provide a method for preparing an iron-based amorphous nanocrystalline soft magnetic alloy material;

[0008] The third object of the present invention is to provide an application of an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0009] In order to achieve the first object of the present invention, the present invention provides an iron-based amorphous nanocrystalline soft magnetic alloy material, the iron-based amorphous nanocrystalline soft magnetic alloy material is a mixture of iron-based amorphous and iron-based nanocrystalline, and the chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the subscripts a, b, c, d, e and f respectively represent the atomic percentage content of the corresponding elements, and satisfy the following conditions: a=83.3%, b=4%, 4%≤c≤8%, d=4%, e=0.7%, 0%≤f≤4%, where a+b+c+d+e+f=100%.

[0010] In one technical solution of the present invention, the atomic percentage content c of the B element and the atomic percentage content f of the C element satisfy the following relationship: c+f=8%; wherein the atomic percentage content f of the C element includes one of 0%, 1%, 2%, and 3%.

[0011] In a technical solution of the present invention, the average size of the α-Fe grains distributed on the amorphous substrate of the iron-based amorphous nanocrystalline soft magnetic alloy material is 16nm-27nm; and / or the effective magnetic permeability of the iron-based amorphous nanocrystalline soft magnetic alloy material under the conditions of 50mT, 20k-200kHz is 1277-2362, and the loss is 17mV / cm 3 -546mV / cm 3 .

[0012] To achieve the second purpose of the present invention, the present invention provides a method for preparing an iron-based amorphous nanocrystalline soft magnetic alloy material, comprising the following steps: S100, mixing Fe, Si, B, FeP alloy, Cu and FeC alloy according to atomic percentage content to obtain a mixed raw material, and smelting the mixed raw material to obtain an alloy ingot; S200, quenching the alloy ingot to obtain an alloy strip; S300, heat treating the alloy strip to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material; wherein the heat treatment includes a single heat treatment or a segmented heat treatment.

[0013] In a technical solution of the present invention, in step S100, the smelting process is performed in an inert atmosphere by a vacuum arc furnace; and / or the smelting process is performed at a temperature of 1800-2500° C. for a time of 15-25 seconds.

[0014] In a technical solution of the present invention, in step S200, the rapid quenching treatment adopts a high vacuum single-roller rapid quenching furnace, and the rotation speed of the copper roller is 45-55m / s; and / or the rapid quenching treatment is performed under an inert atmosphere.

[0015] In a technical solution of the present invention, the heat treatment adopts a single heat treatment, and step S300 includes the following steps: S310, heating the alloy strip to 370-550°C at a rate of 10-40°C / min and heat-treating it, performing a single heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material; wherein the heat-treating time is 30-420s.

[0016] In a technical solution of the present invention, the heat treatment adopts segmented heat treatment, and step S300 includes the following steps: S321, heating the alloy strip to T1 temperature, keeping it warm for t1 time, and performing a first-stage heat treatment; S322, heating the alloy strip after the first-stage heat treatment to T2 temperature, keeping it warm for t2 time, and performing a second-stage heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material; wherein, T1 is 360-420°C, t1 is 0-180s; T2 is 490°C, and t2 and t1 satisfy the relationship: t1+t2=180s.

[0017] In one technical solution of the present invention, the saturation magnetic flux density of the iron-based amorphous nanocrystalline soft magnetic alloy material is 1.57-1.85T, and the coercive force is 6.64-26.26A / m.

[0018] To achieve the third purpose of the present invention, the present invention provides an application of an iron-based amorphous nanocrystalline soft magnetic alloy material. The above-mentioned iron-based amorphous nanocrystalline soft magnetic alloy material can be used to prepare amorphous motors, distribution transformers, mutual inductors, high-frequency switching power supplies, electromagnetic compatibility devices and giant magnetoimpedance sensors.

[0019] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0020] (1) By combining iron-based amorphous materials with iron-based nanocrystals, the saturation magnetic induction intensity of the material can be effectively increased and the coercive force can be reduced, which not only provides a high magnetic response but also makes the material easy to be magnetized and demagnetized, thereby optimizing the high-frequency performance and being suitable for high-efficiency electromagnetic devices such as transformers and motors;

[0021] (2) By adjusting the ratio of B and C, the alloy's amorphous forming ability can be improved and the heat treatment window can be expanded, so that the material can maintain a stable amorphous structure at different temperatures and optimize the soft magnetic properties;

[0022] (3) The use of high vacuum single-roller rapid quenching and precise heat treatment, including primary heat treatment and segmented heat treatment processes, ensures the structural uniformity and performance consistency of the alloy material and promotes industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1 is the XRD test result of the Fe-based amorphous strip AD in the embodiment of the present invention;

[0024] Figure 2 is the DSC test result of the Fe-based amorphous strip AD in the embodiment of the present invention;

[0025] Figure 3 1 is the Bs and Hc test results of the Fe-based amorphous strip AD in the embodiment of the present invention;

[0026] Figure 4 It is the Bs and Hc test results of the Fe-based amorphous nanocrystalline strip EH in the embodiment of the present invention;

[0027] Figure 5 1 is the Bs and Hc test results of the Fe-based amorphous nanocrystalline strip IL according to the embodiment of the present invention;

[0028] Figure 6 is the effective magnetic permeability (μa) test result of the Fe-based amorphous nanocrystalline ribbon M in the embodiment of the present invention;

[0029] Figure 7 It is the loss (Ps) detection result of the Fe-based amorphous nanocrystalline strip M in the embodiment of the present invention. DETAILED DESCRIPTION

[0030] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0031] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0032] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0033] It should be understood that the terms "first", "second", "third", etc. in the claims, specifications and drawings of the present disclosure are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specifications and claims of the present disclosure indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0034] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0035] Soft magnetic materials play a vital role in the production, transmission, and storage of energy, and are key materials for achieving efficient energy conversion. However, in the existing iron-based amorphous nanocrystalline alloy system, how to develop a new generation of soft magnetic alloys with high Bs, low Hc, and excellent high-frequency performance is still a major challenge to be solved in the current field of materials science.

[0036] The present embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, aiming to solve the shortcomings of the prior art of iron-based amorphous nanocrystalline soft magnetic alloy materials.

[0037] The iron-based amorphous nanocrystalline soft magnetic alloy material of this embodiment is a mixture of iron-based amorphous and iron-based nanocrystalline. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f, the subscripts a, b, c, d, e and f respectively represent the atomic percentage content of the corresponding elements, and satisfy the following conditions: a=83.3%, b=4%, 4%≤c≤8%, d=4%, e=0.7%, 0%≤f≤4%, where a+b+c+d+e+f=100%.

[0038] Preferably, the iron-based amorphous nanocrystalline soft magnetic alloy material of this embodiment is a mixture of iron-based amorphous and iron-based nanocrystalline; the iron-based amorphous material has good magnetic permeability and low loss, and the nanocrystalline structure can significantly improve the magnetic response speed of the material. By combining the iron-based amorphous and the iron-based nanocrystalline, the magnetic permeability of the material can be improved while maintaining low loss, so that it still exhibits excellent soft magnetic properties at high frequencies, and is suitable for electromagnetic equipment such as transformers and motors; and by combining amorphous and nanocrystalline, the strength and hardness of the alloy can be effectively improved, and its compression, tension and shear resistance can be enhanced, and the service life of the material can be extended. Secondly, adding Cu elements to the composition can improve the thermal stability of the alloy, increase the scope of application at higher temperatures, especially in high temperature environments such as electricity, automobiles, and industrial equipment, maintain good magnetic properties, and reduce performance attenuation; iron-based alloys are lower in cost than other high-performance soft magnetic materials, and contain fewer harmful elements, which is more environmentally friendly.

[0039] Furthermore, the iron-based amorphous nanocrystalline soft magnetic alloy of this embodiment has high Bs and low Hc. High Bs refers to the maximum magnetic induction intensity that the material can achieve under the action of an external magnetic field. A higher Bs means that the material can achieve stronger magnetism under a smaller external magnetic field. The iron-based amorphous alloy of this embodiment itself has a very high saturation magnetic induction intensity. By combining with a nanocrystalline structure, the magnetic response of the alloy can be further improved; the addition of nanocrystals improves the magnetic domain wall movement ability of the material, thereby improving its magnetic induction intensity. Among them, the iron content is relatively high, reaching 83.3%. The iron element itself has very high magnetism, so it can provide a strong magnetic response for the material; a reasonable proportion of elements such as silicon and copper can also improve the magnetic properties of the material while maintaining the amorphous state. Low Hc refers to the external magnetic field intensity required for the material to retain its magnetism after the magnetic field is removed. Low Hc means that the material is easily magnetized and demagnetized, which is conducive to reducing energy consumption and improving response speed, making the material more suitable for high-frequency work. Iron-based amorphous alloys have a disordered atomic structure and lack long-range ordered arrangement, which makes it easier for the magnetic domain wall to move. Therefore, after the external magnetic field is removed, the movement of the magnetic domain wall is not strongly hindered, resulting in lower coercivity. The nanocrystalline structure gives the material a smaller grain size, which helps reduce the reversal barrier of the magnetic domain, making the material easier to demagnetize, so Hc is lower.

[0040] Furthermore, the average size of α-Fe grains distributed on the amorphous substrate of the iron-based amorphous nanocrystalline soft magnetic alloy material is 16nm-27nm.

[0041] Furthermore, the addition of silicon can increase the resistivity of the alloy, reduce energy loss, and improve the high-frequency soft magnetic properties of the material, further increase Bs and reduce Hc; copper can help improve the conductivity and ductility of the material, avoid the material from being too brittle, and optimize its magnetic properties; boron can promote the formation of amorphous structure in iron-based alloys, and form stable oxides in the alloy, improving the oxidation resistance of the alloy; phosphorus can improve the corrosion resistance and wear resistance of the material; carbon is used to strengthen the strength and hardness of iron-based alloys, and carbon can form carbides, increasing the wear resistance and corrosion resistance of the material; by strictly controlling the proportion of alloying elements, the magnetic interference of other ferromagnetic impurities on the material is avoided, so that the magnetic properties of the alloy can be more concentrated on the iron-based components, thereby increasing the saturation magnetic induction intensity and reducing the coercive force.

[0042] Preferably, the atomic percentage content c of the B element and the atomic percentage content f of the C element satisfy the following relationship: c+f=8%; wherein the atomic percentage content f of the C element includes one of 0%, 1%, 2%, and 3%. B promotes amorphization in the iron-based alloy and helps the alloy to form an amorphous structure during rapid cooling. By introducing an appropriate amount of C to replace part of B, C can further enhance the stability of the amorphous structure and jointly optimize the amorphous forming ability of the alloy with B. Thus, by controlling the ratio of B and C, the amorphous forming temperature and cooling rate requirements of the alloy can be adjusted, making it easier to form a stable amorphous structure in actual production. The addition of carbon can optimize the heat treatment window of the alloy, that is, allow a wider range of heat treatment operations, thereby obtaining ideal amorphous and nanocrystalline structures under different temperature conditions, which can bring the best soft magnetic properties and magnetic permeability to the alloy. Therefore, by introducing C to replace B, it has better amorphous forming ability and a larger heat treatment window, which is conducive to more accurate control of the heat treatment temperature and promotes industrial production, thereby obtaining better soft magnetic properties; on the other hand, it avoids expensive metal elements, effectively reduces production costs, and can prepare iron-based amorphous nanocrystalline soft magnetic alloy materials with both high Bs and low Hc.

[0043] This embodiment provides a method for preparing an iron-based amorphous nanocrystalline soft magnetic alloy material, comprising the following steps:

[0044] S100, mixing Fe, Si, B, FeP alloy, Cu and FeC alloy according to atomic percentage to obtain a mixed raw material, and smelting the mixed raw material to obtain an alloy ingot;

[0045] S200, subjecting the alloy ingot to rapid quenching of the melt to obtain an alloy strip;

[0046] S300, heat-treating the alloy strip to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material;

[0047] The heat treatment includes one-step heat treatment or segmented heat treatment.

[0048] Preferably, in step S100, the smelting treatment is carried out in a vacuum arc furnace under an inert atmosphere, which can effectively avoid oxidation reactions and ensure the purity and uniformity of the elements in the alloy, thereby improving the overall performance of the alloy; the smelting treatment temperature is 1800-2500°C and the time is 15-25s, which can ensure sufficient melting and alloying reactions and avoid element volatilization or uneven alloy composition caused by excessive heating.

[0049] Preferably, in step S200, a high vacuum single-roller rapid quenching furnace is used for rapid quenching treatment, which can effectively control the cooling rate of the alloy strip, thereby ensuring that the alloy forms an amorphous or nanocrystalline structure during the rapid cooling process and improving the soft magnetic properties of the material; the copper roller speed is 45-55m / s, which can ensure rapid heat transfer and rapid solidification of the molten alloy, further promote the formation of amorphous or nanocrystalline phases, avoid excessive growth of grains, ensure the refinement of the microstructure, and thus optimize the soft magnetic properties of the alloy. Rapid quenching treatment is carried out in an inert atmosphere, which helps to avoid oxidation reactions, protect the alloy surface from oxidation, maintain the purity and stability of the material, and further improve the performance of the alloy and the consistency of production.

[0050] Furthermore, in step S300, a single heat treatment is performed, and the alloy strip is heated to 370-550°C at a rate of 10-40°C / min for heat preservation. Slow heating and heat preservation can effectively control the phase change process of the material, promote the transformation from amorphous state to nanocrystalline state, and avoid excessive growth of unstable phases or grains caused by too rapid heating, which helps to form a uniform and refined nanocrystalline structure, thereby optimizing the soft magnetic properties.

[0051] Furthermore, the saturation flux density of the iron-based amorphous nanocrystalline soft magnetic alloy material subjected to a single heat treatment is 1.57-1.85 T, and the coercive force is 7.79-26.26 A / m.

[0052] Furthermore, the step S300 of adopting staged heat treatment includes one stage and two stage heat treatment. Through the staged heat treatment process, the grain growth and phase transformation of the alloy material can be precisely controlled at different temperatures and holding times. The first stage of heat treatment helps to gradually guide the transformation of the amorphous structure to the nanocrystalline structure, and the second stage optimizes the performance of the material by further promoting the growth of nanocrystals.

[0053] Furthermore, the saturation flux density of the iron-based amorphous nanocrystalline soft magnetic alloy material using segmented heat treatment is 1.57-1.85T, and the coercive force is 6.64-11.47A / m.

[0054] Example 1

[0055] The present embodiment provides an iron-based amorphous soft magnetic alloy material and a preparation method thereof. The iron-based amorphous soft magnetic alloy material is numbered A; the atomic percentage contents of the iron-based amorphous soft magnetic alloy material are as follows: Fe=83.3%, Si=4%, B=8%, P=4%, Cu=0.7%, and C=0%;

[0056] The preparation method comprises the following steps:

[0057] S100, Fe, Si, B, FeP alloy, and Cu are mixed according to the above atomic percentage content to obtain a mixed raw material, and the mixed raw material is smelted in a vacuum arc furnace under an argon atmosphere at a temperature of 1800-2500° C. for a time of 15-25 seconds to obtain an alloy ingot;

[0058] S200, the alloy ingot is subjected to melt rapid quenching in an argon atmosphere in a high vacuum single-roller rapid quenching furnace with a copper roller speed of 55 m / s to obtain an alloy strip;

[0059] Among them, the purity of Fe is 99.99wt.%, the purity of Si is 99.99wt.%, the purity of Cu is 99.99wt.%, the purity of B is 99.99wt.% and the purity of FeP alloy is 20.24wt.%.

[0060] Example 2

[0061] The present embodiment provides an iron-based amorphous soft magnetic alloy material and a preparation method thereof. The iron-based amorphous soft magnetic alloy material is numbered B; the atomic percentage contents of the iron-based amorphous soft magnetic alloy material are as follows: Fe=83.3%, Si=4%, B=7%, P=4%, Cu=0.7%, and C=1%;

[0062] The preparation method comprises the following steps:

[0063] S100, Fe, Si, B, FeP alloy, Cu and FeC alloy are mixed according to the above atomic percentage content to obtain a mixed raw material, and the mixed raw material is smelted in a vacuum arc furnace under an argon atmosphere at a temperature of 1800-2500° C. for a time of 15-25 seconds to obtain an alloy ingot;

[0064] S200, the alloy ingot is subjected to melt rapid quenching in an argon atmosphere in a high vacuum single-roller rapid quenching furnace with a copper roller speed of 55 m / s to obtain an alloy strip;

[0065] Among them, the purity of Fe is 99.99wt.%, the purity of Si is 99.99wt.%, the purity of Cu is 99.99wt.%, the purity of B is 99.99wt.%, the purity of FeP alloy is 20.24wt.%, and the purity of FeC alloy is 15wt.%.

[0066] Example 3

[0067] The present embodiment provides an iron-based amorphous soft magnetic alloy material and a preparation method thereof. The iron-based amorphous soft magnetic alloy material is numbered C; the atomic percentage contents of the iron-based amorphous soft magnetic alloy material are as follows: Fe=83.3%, Si=4%, B=6%, P=4%, Cu=0.7%, and C=2%;

[0068] The preparation method comprises the following steps:

[0069] S100, Fe, Si, B, FeP alloy, Cu and FeC alloy are mixed according to the above atomic percentage content to obtain a mixed raw material, and the mixed raw material is smelted in a vacuum arc furnace under an argon atmosphere at a temperature of 1800-2500° C. for a time of 15-25 seconds to obtain an alloy ingot;

[0070] S200, the alloy ingot is subjected to melt rapid quenching in an argon atmosphere in a high vacuum single-roller rapid quenching furnace with a copper roller speed of 55 m / s to obtain an alloy strip;

[0071] Among them, the purity of Fe is 99.99wt.%, the purity of Si is 99.99wt.%, the purity of Cu is 99.99wt.%, the purity of B is 99.99wt.%, the purity of FeP alloy is 20.24wt.%, and the purity of FeC alloy is 15wt.%.

[0072] Example 4

[0073] The present embodiment provides an iron-based amorphous soft magnetic alloy material and a preparation method thereof. The iron-based amorphous soft magnetic alloy material is numbered D; the atomic percentage contents of the iron-based amorphous soft magnetic alloy material are as follows: Fe=83.3%, Si=4%, B=5%, P=4%, Cu=0.7%, and C=3%;

[0074] The preparation method comprises the following steps:

[0075] S100, Fe, Si, B, FeP alloy, Cu and FeC alloy are mixed according to the above atomic percentage content to obtain a mixed raw material, and the mixed raw material is smelted in a vacuum arc furnace under an argon atmosphere at a temperature of 1800-2500° C. for a time of 15-25 seconds to obtain an alloy ingot;

[0076] S200, the alloy ingot is subjected to melt rapid quenching in an argon atmosphere in a high vacuum single-roller rapid quenching furnace with a copper roller speed of 55 m / s to obtain an alloy strip;

[0077] Among them, the purity of Fe is 99.99wt.%, the purity of Si is 99.99wt.%, the purity of Cu is 99.99wt.%, the purity of B is 99.99wt.%, the purity of FeP alloy is 20.24wt.%, and the purity of FeC alloy is 15wt.%.

[0078] Example 5

[0079] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered E. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 8%, d = 4%, e = 0.7%, f = 0%;

[0080] The preparation method comprises the following steps:

[0081] S310, heating the sample A to 490°C at a rate of 25°C / min and keeping the temperature for 300s, and performing a heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0082] Example 6

[0083] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered F. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 7%, d = 4%, e = 0.7%, f = 1%;

[0084] The preparation method comprises the following steps:

[0085] S310, heating the sample No. B to 490° C. at a rate of 25° C. / min and keeping the temperature for 300 seconds, and performing a heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0086] Example 7

[0087] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered G. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 6%, d = 4%, e = 0.7%, f = 2%;

[0088] The preparation method comprises the following steps:

[0089] S310, raising the temperature of No. C to 490° C. at a rate of 25° C. / min and performing a heat preservation treatment for 300 seconds, performing a heat treatment once, and obtaining an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0090] Example 8

[0091] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered H. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 5%, d = 4%, e = 0.7%, f = 3%;

[0092] The preparation method comprises the following steps:

[0093] S310, raising the temperature of No. D to 490° C. at a rate of 25° C. / min and performing a heat preservation treatment for 300 seconds, performing a heat treatment once, and obtaining an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0094] Example 9

[0095] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered I. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 6%, d = 4%, e = 0.7%, f = 2%;

[0096] The preparation method comprises the following steps:

[0097] S310, heating the sample No. C to 490° C. at a rate of 25° C. / min and keeping the temperature for 30 seconds, performing a heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0098] Example 10

[0099] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered J. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 6%, d = 4%, e = 0.7%, f = 2%;

[0100] The preparation method comprises the following steps:

[0101] S310, heating the sample No. C to 490° C. at a rate of 25° C. / min and keeping the temperature for 60 seconds, performing a heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0102] Embodiment 11

[0103] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered K. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 6%, d = 4%, e = 0.7%, f = 2%;

[0104] The preparation method comprises the following steps:

[0105] S310, heating the sample No. C to 490° C. at a rate of 25° C. / min and keeping the temperature for 180 seconds, performing a heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0106] Example 12

[0107] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered M. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e Cf , the atomic percentage contents are: a = 83.3%, b = 4%, c = 6%, d = 4%, e = 0.7%, f = 2%;

[0108] The preparation method comprises the following steps:

[0109] S310, heating the sample No. C to 490° C. at a rate of 25° C. / min and keeping the temperature for 420 seconds, performing a heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0110] Embodiment 13

[0111] This embodiment provides an iron-based amorphous nanocrystalline soft magnetic alloy material and a preparation method thereof, which is numbered N. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the atomic percentage contents are: a = 83.3%, b = 4%, c = 6%, d = 4%, e = 0.7%, f = 2%;

[0112] The preparation method comprises the following steps:

[0113] S321, heating No. C to 420°C, keeping the temperature for 120s, and performing a first-stage heat treatment;

[0114] S322. The alloy strip after the first-stage heat treatment is heated to 490°C, kept at this temperature for 60 seconds, and subjected to a second-stage heat treatment to obtain an iron-based amorphous nanocrystalline soft magnetic alloy material.

[0115] Experimental results: The XRD test results of Examples 1-4 are as follows Figure 1 As shown, it can be seen that they are all bun peaks, that is, amorphous structures can be obtained after rapid quenching; the DSC test results of Examples 1-4 are as follows Figure 2 As shown, it can be seen that the heat treatment windows of No. B, C, and D after adding carbon are much higher than No. A; the Bs and Hc test results of Examples 1-4 are as follows Figure 3 As shown, it can be seen from the hysteresis loop (BH curve) that with the increase of the external magnetic field, the magnetic induction intensity of the material gradually increases until saturation. The curve changes of different samples show their differences in magnetic properties. The shape and width of the hysteresis loop can reflect the Hc and Bs of the alloy; the upper left figure shows that with the change of the content of B and C elements, the saturation magnetic induction intensity shows a certain fluctuation or increase; the lower right figure shows the change trend of coercive force with the change of the content of B and C elements, proving that the material can more easily recover to its original state after the magnetic field is removed;

[0116] The Bs and Hc test results of Examples 5-8 are as follows: Figure 4 As shown in the figure, with the change of element percentage, the coercivity and saturation magnetic induction intensity show opposite trends. The addition of element C affects the magnetic properties of the alloy, especially its coercivity and saturation magnetic induction intensity.

[0117] The Bs and Hc test results of Examples 9-12 are as follows: Figure 5 As shown, with the increase of heat treatment time, the coercivity initially decreases, reaches a minimum point and then begins to increase, while the saturation magnetic induction intensity shows the opposite trend, first increasing and then stabilizing.

[0118] The effective magnetic permeability test results of Example 13 are as follows Figure 6 As shown in FIG. 1 , as the frequency increases, the magnetic permeability decreases inversely; the loss detection results of Example 13 are as follows: Figure 7 As shown, as the frequency increases, the loss increases.

[0119] Finally, it should be noted that the embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An iron-based amorphous nanocrystalline soft magnetic alloy material, characterized in that: The iron-based amorphous nanocrystalline soft magnetic alloy material is a mixture of iron-based amorphous and iron-based nanocrystalline. The chemical composition expression of the iron-based amorphous nanocrystalline soft magnetic alloy material is: Fe a Si b B c P d Cu e C f , the subscripts a, b, c, d, e and f respectively represent the atomic percentage content of the corresponding elements, and satisfy the following conditions: a=83.3%, b=4%, 4%≤c≤8%, d=4%, e=0.7%, 0%≤f≤4%, where a+b+c+d+e+f=100%.

2. The iron-based amorphous nanocrystalline soft magnetic alloy material according to claim 1, characterized in that: The atomic percentage content c of the B element and the atomic percentage content f of the C element satisfy the following relationship: c+f=8%; The atomic percentage content f of the C element includes one of 0%, 1%, 2% and 3%.

3. The iron-based amorphous nanocrystalline soft magnetic alloy material according to claim 1, characterized in that: The average size of the α-Fe grains of the iron-based amorphous nanocrystalline soft magnetic alloy material distributed on the amorphous substrate is 16nm-27nm. ; and / or The effective magnetic permeability of the iron-based amorphous nanocrystalline soft magnetic alloy material under the conditions of 50mT and 20k-200kHz is 1277-2362, and the loss is 17mV / cm 3 -546mV / cm 3 .

4. A method for preparing an iron-based amorphous nanocrystalline soft magnetic alloy material, characterized in that: The preparation method is used to prepare the iron-based amorphous nanocrystalline soft magnetic alloy material as claimed in any one of claims 1 to 3, comprising the following steps: S100, mixing Fe, Si, B, FeP alloy, Cu and FeC alloy according to atomic percentage to obtain a mixed raw material, and smelting the mixed raw material to obtain an alloy ingot; S200, subjecting the alloy ingot to rapid quenching of the melt to obtain an alloy strip; S300, heat treating the alloy strip to obtain the iron-based amorphous nanocrystalline soft magnetic alloy material; Wherein, the heat treatment includes a single heat treatment or a staged heat treatment.

5. The preparation method according to claim 4, characterized in that: In step S100, The smelting process is carried out in a vacuum arc furnace under an inert atmosphere; and / or The smelting treatment is carried out at a temperature of 1800-2500° C. and for a time of 15-25 seconds.

6. The preparation method according to claim 4, characterized in that: In step S200, The rapid quenching treatment adopts a high vacuum single-roller rapid quenching furnace, and the copper roller speed is 45-55m / s; and / or The rapid quenching treatment is performed under an inert atmosphere.

7. The preparation method according to claim 4, characterized in that: The heat treatment adopts a single heat treatment, and step S300 includes the following steps: S310, heating the alloy strip to 370-550° C. at a rate of 10-40° C. / min and maintaining the temperature, performing the primary heat treatment, and obtaining the iron-based amorphous nanocrystalline soft magnetic alloy material; Wherein, the time of the heat preservation treatment is 30-420s.

8. The preparation method according to claim 4, characterized in that: The heat treatment adopts staged heat treatment, and step S300 includes the following steps: S321, heating the alloy strip to a temperature of T1, keeping the temperature for a time of t1, and performing a first-stage heat treatment; S322, heating the alloy strip after the first-stage heat treatment to a temperature T2, keeping the temperature for a time t2, and performing a second-stage heat treatment to obtain the iron-based amorphous nanocrystalline soft magnetic alloy material; Among them, T1 is 360-420℃, t1 is 0-180s; T2 is 490°C, and t2 and t1 satisfy the relationship: t1+t2=180s.

9. The preparation method according to any one of claims 7-8, characterized in that: The iron-based amorphous nanocrystalline soft magnetic alloy material has a saturation magnetic flux density of 1.57-1.85 T and a coercive force of 6.64-26.26 A / m.

10. An application of an iron-based amorphous nanocrystalline soft magnetic alloy material, characterized in that: The iron-based amorphous nanocrystalline soft magnetic alloy material according to any one of claims 1 to 3 is used to prepare amorphous motors, distribution transformers, mutual inductors, high-frequency switching power supplies, electromagnetic compatibility devices and giant magnetoimpedance sensors.

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