Iron-based amorphous nanocrystalline alloy and preparation method and application thereof
Through specific chemical composition and precise preparation process, high-performance iron-based amorphous nanocrystalline alloys were prepared, which solved the problems of insufficient soft magnetic properties and stability and achieved low-energy consumption and environmentally friendly alloy preparation.
Patent Information
- Application Number
- CN202510884646.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-10-17
AI Technical Summary
Existing iron-based amorphous nanocrystalline alloys have insufficient soft magnetic properties and stability, and traditional preparation processes have high energy consumption and harmful gas emissions that do not meet environmental protection requirements.
High-performance amorphous nanocrystalline alloy strips are produced using a specific chemical composition of iron-based amorphous nanocrystalline alloy formula FeaNibCrcModCoeCfCugMh through induction furnace melting, twin-roll rolling and contact heating annealing, combined with magnetic field and tensile stress treatment.
The alloy's saturation magnetic induction intensity is improved and loss is reduced, it has excellent soft magnetic properties and stability, reduces harmful gas emissions, and meets environmental protection requirements.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of alloy materials, and particularly relates to an iron-based amorphous nanocrystalline alloy and a preparation method and application thereof. BACKGROUND
[0002] With the development of power electronics technology, the performance requirements for soft magnetic materials are getting higher and higher. The iron-based nanocrystalline alloy is an amorphous material formed by rapid solidification process of an alloy mainly composed of iron elements and a small amount of Nb, Cu, Si and B elements. After heat treatment, the amorphous material can obtain nanometer-level diameter dispersedly distributed in the amorphous matrix, which is called microcrystalline or nanocrystalline material. The iron-based amorphous nanocrystalline alloy has a wide application prospect in the fields of high-frequency transformer, sensor, micro power electronic device and switching power supply, etc. due to its excellent soft magnetic properties such as high magnetic permeability, low coercivity and low high-frequency loss.
[0003] However, the soft magnetic properties and stability of the existing iron-based amorphous nanocrystalline alloy still need to be improved, and at the same time, the traditional preparation process has problems such as high energy consumption and harmful gas emission, which does not meet the current environmental protection and sustainable development requirements. SUMMARY
[0004] To solve the above technical problems, the present application provides an iron-based amorphous nanocrystalline alloy, which is composed of the following chemical formula: Fe a Ni b Cr c Mo d Co e C f Cu g M h , wherein M is a halogen element selected from one of F, Cl, Br and I; a, b, c, d, e, f, g and h are the atomic percentage contents of the corresponding components respectively: 78≤a≤85, 1.73≤b≤6.6, 1.75≤c≤6.2, 1.81≤d≤5.9, 0.8≤e≤6.3, 0.8≤f≤1.4, 0.6≤g≤1.1, 0.1≤h≤0.5, and a+b+c+d+e+f+g+h=100.
[0005] Preferably, the oxygen content in the iron-based amorphous nanocrystalline alloy is less than 9ppm.
[0006] Preferably, the iron-based amorphous nanocrystalline alloy is an iron-based amorphous nanocrystalline alloy strip.
[0007] The width of the iron-based amorphous nanocrystalline alloy strip is greater than or equal to 210mm, and the thickness is less than or equal to 18μm.
[0008] Preferably, the magnetic induction intensity of the iron-based amorphous nanocrystalline alloy is greater than or equal to 1.7T.
[0009] The application also provides a preparation method of the iron-based amorphous nanocrystalline alloy.
[0010] The raw materials of elemental Fe, Ni, Cr, Mo, Co, C and Cu and one of FeF3, FeCl3, FeBr3 and FeI3 are weighed according to the atomic percentage of the nanocrystalline soft magnetic alloy composition;
[0011] The raw materials are melted in an inert gas atmosphere to obtain an alloy liquid;
[0012] The alloy liquid is rolled by a double roller to obtain an amorphous precursor strip;
[0013] The amorphous precursor strip is annealed by contact heating to obtain the iron-based amorphous nanocrystalline alloy.
[0014] In the preparation method, the weights of the raw materials of Fe, Co, C and Cu are accurately weighed according to the designed formula of the alloy, so that the atomic percentages of the elements meet the predetermined chemical formula. This step requires high accuracy to ensure the uniformity and final performance of the alloy.
[0015] Preferably, the melting of the raw materials in the inert gas atmosphere specifically includes:
[0016] The raw materials are melted in a high-purity argon protective atmosphere by an induction furnace, and the temperature of the induction furnace is 1500-1600℃.
[0017] The raw materials are melted in a protective atmosphere by an induction furnace; the prepared raw materials are placed in the induction furnace and heated in a strictly controlled protective atmosphere to prevent the alloy from being oxidized at high temperature. The induction furnace provides a rapid and uniform heating method, which can quickly raise the temperature to 1500-1600℃, which is conducive to the melting and uniform mixing of the alloy composition. In the melting process, electromagnetic stirring is used to ensure the uniform distribution of the alloy composition. The inert gas is high-purity argon. The inert gas atmosphere uses high-purity argon to prevent the alloy from being oxidized at high temperature and reduce the generation of harmful gases.
[0018] Preferably, the rolling temperature of the double roller rolling is adjusted to 50-100℃, and the rolling force is controlled to 15-35kN.
[0019] The molten alloy liquid is prepared into the amorphous precursor strip through the improved double-roller rolling method, that is, the temperature of the roller is monitored and adjusted in real time, the rolling temperature is adjusted to 50-100 ℃ to ensure uniform cooling of the alloy liquid, and the rolling force is accurately controlled to 15-35 kN by combining a precise pressure sensor and a feedback mechanism, so that the alloy liquid is uniformly spread and rapidly solidified between the double rollers, thereby preparing the amorphous precursor strip with better performance; the molten alloy liquid is rapidly poured between a pair of cooling rollers rotating in opposite directions through a special nozzle or funnel, and the alloy liquid is rapidly solidified under the rapid cooling action of the cooling rollers to form the amorphous precursor strip. This step requires accurate control of the cooling speed, which is between 105-107 ℃ / s, so as to form the amorphous precursor strip with a good amorphous structure.
[0020] Preferably, the annealing heat treatment comprises five stages of a temperature rising stage, a first annealing stage, a second annealing stage, a third annealing stage and a temperature cooling stage.
[0021] The temperature rising stage is to heat the amorphous precursor strip to the first annealing temperature.
[0022] The first annealing stage is to heat the strip after the temperature rising stage to the first annealing temperature for the first time.
[0023] The second annealing stage is to heat the strip after the first annealing to the second annealing temperature for the second time.
[0024] The third annealing stage is to heat the strip after the second annealing to the third annealing temperature for the third time.
[0025] The temperature cooling stage is to cool the strip after the third annealing to room temperature.
[0026] Preferably, the temperature rising stage is heated to the first annealing temperature at a rate of 1-10 ℃ / min.
[0027] The first annealing temperature is not higher than the crystallization temperature of the alloy. The crystallization temperature is tested by a differential scanning calorimeter to be between 490-520 ℃.
[0028] Preferably, the first annealing temperature is 235-455 ℃, and the first time is 20-60 min.
[0029] Further preferably, the first annealing temperature is 250-400 ℃, and the first time is 30-55 min. In order to promote stress release and structural relaxation of the amorphous alloy, the annealing temperature range of the first annealing is relatively large, and the time flow of the heat preservation treatment needs to be relatively long, which prepares for the subsequent crystallization annealing.
[0030] Preferably, the second annealing temperature is 490-520℃, and the second time is 15-40min;
[0031] Further preferably, the second annealing temperature is 495-515℃, and the second time is 20-40min; the second annealing and holding treatment is performed to promote the crystallization and growth of the α-Fe(Co) phase and form the amorphous / nanocrystalline dual-phase structure. In such a temperature and holding time range, the nanocrystals can be uniformly precipitated and refined.
[0032] Preferably, the third annealing temperature is 530-570℃, and the third time is 30-90min;
[0033] Further preferably, the third annealing temperature is 535-560℃, and the third time is 40-85min. In the third annealing process, the amorphous nanocrystalline alloy strip is further heated to a higher temperature to promote more complete crystallization.
[0034] Preferably, a tensile stress of 18-22N and a magnetic field of 650-750Gs perpendicular to the width direction of the amorphous precursor strip are applied during the third annealing process.
[0035] By applying a tensile stress and a magnetic field perpendicular to the width direction of the strip during the third annealing and holding process, the induced anisotropy generated by the tensile stress helps to refine the grain size, and the magnetic field helps to adjust the domain structure, thereby reducing the coercivity and loss and improving the permeability of the alloy.
[0036] Preferably, the cooling stage is cooled to room temperature at a rate of 10-20℃ / min.
[0037] In the cooling stage, the strip is cooled to room temperature at a rate of 10℃ / min by circulating cooling with a fan to fix the microstructure and soft magnetic properties of the alloy.
[0038] In the preparation method, the annealing treatment of the strip by touch heating as described above can greatly reduce the emission of harmful gases. In addition, the magnetic field and stress applied during the annealing process of the present application help to improve the soft magnetic properties of the alloy and also reduce the energy consumption that may be required in subsequent processing.
[0039] The present application also provides the use of the iron-based amorphous nanocrystalline alloy in soft magnetic materials, electromagnetic components, power electronic devices, sensors, and magnetic recording media.
[0040] Compared with the prior art, the present application has the following advantages:
[0041] The iron-based amorphous nanocrystalline alloy provided by the present application has the following chemical formula: Fe aNi b Cr c Mo d Co e C f Cu g M h , wherein M is a halogen element selected from one of F, Cl, Br, I; a, b, c, d, e, f, g and h are atomic percentage contents of the corresponding components respectively: 78≤a≤85, 1.73≤b≤6.6, 1.75≤c≤6.2, 1.81≤d≤5.9, 0.8≤e≤6.3, 0.8≤f≤1.4, 0.6≤g≤1.1, 0.1≤h≤0.5, and a+b+c+d+e+f+g+h=100. The Fe, Ni, Cr, Mo, Co, C, Cu and halogen element of the present application interact with each other, have a synergistic effect on improving the saturation magnetic induction intensity and reducing the loss and coercivity of the iron-based amorphous nanocrystalline alloy, and the addition of the halogen element is more helpful to precipitate fine nanocrystalline grains, which can widen the magnetic domain structure during heat treatment, so that the alloy has better soft magnetic properties and stability, the saturation magnetic induction intensity is not less than 1.7T, and has excellent loss performance, specifically the magnetic loss P 400Hz / 1.5T ≤3.2W / kg at a frequency of 400Hz, and the magnetic loss P 1kHz / 1.0T ≤3.8W / kg at a frequency of 1kHz. Such excellent performance is more suitable for application in soft magnetic materials, electromagnetic elements, power electronic devices, sensors, magnetic recording media.
[0042] The preparation method of the iron-based amorphous nanocrystalline alloy provided by the present application effectively eliminates the strip stress through suitable heat treatment design, promotes uniform grain precipitation and refinement, and further improves the magnetic properties of the alloy by refining the magnetic domain under the application of a magnetic field, and the annealing is performed in a touch heating mode, so that the emission of harmful gases is reduced and meets the environmental protection requirements, and therefore the method is more suitable for practical production application. BRIEF DESCRIPTION OF DRAWINGS
[0043] Figure 1 is a molecular model diagram of the iron-based amorphous nanocrystalline alloy of the present application;
[0044] Figure 2 is a flowchart of the preparation method of the iron-based amorphous nanocrystalline alloy of the present application;
[0045] Figure 3 is the magnetic hysteresis loop of the iron-based amorphous nanocrystalline alloy of Example 1;
[0046] Figure 4 is the magnetic hysteresis loop of the iron-based amorphous nanocrystalline alloy of Example 2;
[0047] Figure 5Hysteresis loop of the iron-based amorphous nanocrystalline alloy of Example 3. DETAILED DESCRIPTION
[0048] In order to better explain the present application, in order to facilitate understanding, the following through specific embodiments, the present application is described in detail.
[0049] An iron-based amorphous nanocrystalline alloy, which is composed of the following chemical formula: Fe a Ni b Cr c Mo d Co e C f Cu g M h , wherein M is a halogen element, selected from one of F, Cl, Br, I; the a, b, c, d, e, f, g and h are the atomic percentage content of the corresponding component respectively: 78≤a≤85, 1.73≤b≤6.6, 1.75≤c≤6.2, 1.81≤d≤5.9, 0.8≤e≤6.3, 0.8≤f≤1.4, 0.6≤g≤1.1, 0.1≤h≤0.5, and a+b+c+d+e+f+g+h=100.
[0050] The molecular model diagram of the iron-based amorphous nanocrystalline alloy of the present application is shown in Figure 1 .
[0051] The preparation process of the iron-based amorphous nanocrystalline alloy of the present application is shown in Figure 2 .
[0052] Example 1
[0053] The present embodiment provides an iron-based amorphous nanocrystalline alloy, whose chemical formula is Fe 79.9 Ni 6.2 Cr 5.6 Mo 4.9 Co 1.5 C 1. 0Cu 0.8 Cl 0.1 .
[0054] The preparation method of the iron-based amorphous nanocrystalline alloy of the present embodiment comprises the following steps:
[0055] S1: according to the chemical formula Fe 79.9 Ni 6.2 Cr 5.6 Mo 4.9 Co 1.5 C 1.0 Cu 0.8 Cl 0.1, accurately weighing Fe, Ni, Cr, Mo, Co, C, Cu, FeCl3 and compound raw materials so that the atomic percentage of Fe is 79.9%, the atomic percentage of Ni is 6.2%, the atomic percentage of Cr is 5.6%, the atomic percentage of Mo is 4.9%, the atomic percentage of Co is 1.5%, the atomic percentage of C is 1.0%, the atomic percentage of Cu is 0.8%, and the atomic percentage of Cl is 0.1%;
[0056] S2: placing the raw materials into an induction furnace at a temperature of 1500° C., heating them in a high-purity argon atmosphere until they melt into a liquid alloy, and simultaneously using electromagnetic stirring to ensure uniform distribution of the alloy components;
[0057] S3: The alloy liquid is passed through an improved twin-roll rolling mill, wherein the rolling temperature is controlled at 60°C, the rolling force is controlled at 25 kN, and the alloy liquid is rapidly solidified into an amorphous precursor strip at a cooling rate of 106°C / s in an argon protective atmosphere. The obtained amorphous precursor strip has a thickness of about 16 μm and a width of 210 mm.
[0058] S4: performing annealing heat treatment by contact heating, specifically comprising the following steps:
[0059] Heating: heating the amorphous precursor strip to an initial annealing temperature of 235° C. (lower than the crystallization temperature of the alloy) at a heating rate of 5° C. / min;
[0060] First annealing: keep at 235℃ for 30 minutes;
[0061] Second annealing: heat to 490°C and keep warm for 20 minutes;
[0062] The third annealing: cooling to 550° C. and keeping the temperature for 60 minutes, during which a tensile stress of 20 N and a magnetic field of 700 Gs perpendicular to the width direction of the amorphous precursor strip are applied.
[0063] Cooling: The amorphous precursor strip is cooled to room temperature at a rate of 10° C. / min by a fan circulation cooling to obtain the iron-based amorphous nanocrystalline alloy.
[0064] The hysteresis loop of the Fe-based amorphous nanocrystalline alloy obtained by testing is as follows: Figure 3 As shown. Figure 3 It can be seen that the saturation magnetic induction intensity is 1.71 T. The magnetic loss P at a frequency of 400 Hz was tested using an AC BH instrument. 400Hz / 1.5T = 2.82W / kg, and the magnetic loss P at a frequency of 1kHz 1kHz / 1.0T =3.53W / kg.
[0065] Example 2
[0066] The embodiment provides an iron-based amorphous nanocrystalline alloy, which has a chemical formula of Fe 81 Ni 5.1 Cr 5.2 Mo5Co 1.4 C 1.1 Cu 0.7 F 0.5 .
[0067] The preparation method of the iron-based amorphous nanocrystalline alloy comprises the following steps:
[0068] S1: according to the chemical formula Fe 81 Ni 5.1 Cr 5.2 Mo5Co 1.4 C 1.1 Cu 0.7 F 0.5 , the raw materials of Fe, Ni, Cr, Mo, Co, C, Cu and FeF3 are accurately weighed, so that the atomic percentage of Fe is 81%, the atomic percentage of Ni is 5.1%, the atomic percentage of Cr is 5.2%, the atomic percentage of Mo is 5%, the atomic percentage of Co is 1.4%, the atomic percentage of C is 1.1%, the atomic percentage of Cu is 0.7%, and the atomic percentage of F is 0.5%;
[0069] S2: the raw materials are placed in an induction furnace, the temperature of the induction furnace is 1550 DEG C, and the raw materials are heated to be melted into alloy liquid in a high-purity argon atmosphere, and electromagnetic stirring is used to ensure uniform distribution of alloy components;
[0070] S3: the alloy liquid is passed through a modified double-roller rolling machine, the rolling temperature is controlled to be 70 DEG C, the rolling force is controlled to be 35 kN, and the alloy liquid is rapidly solidified into an amorphous precursor tape at a cooling speed of 106 DEG C / s in an argon protective atmosphere, the thickness of the tape is about 17 mu m, and the width of the tape is 216 mm;
[0071] S4: annealing heat treatment comprises the following steps:
[0072] temperature rising: the amorphous precursor tape is heated to an initial annealing temperature of 273 DEG C (lower than the crystallization temperature of the alloy) at a temperature rising rate of 5 DEG C / min;
[0073] first annealing: annealing at 273 DEG C for 30 min;
[0074] second annealing: the amorphous precursor tape is heated to 509 DEG C and annealed for 20 min;
[0075] third annealing: the amorphous precursor tape is cooled to 560 DEG C and annealed for 60 min, and a tensile stress of 20 N and a magnetic field of 700 Gs perpendicular to the width direction of the tape are applied during the annealing process;
[0076] Cooling: The amorphous precursor strip is cooled to room temperature at a rate of 10° C. / min by fan circulation cooling to obtain the iron-based amorphous nanocrystalline alloy.
[0077] The hysteresis loop of the Fe-based amorphous nanocrystalline alloy obtained by testing is as follows: Figure 4 As shown. Figure 4 It can be obtained that the saturation magnetic induction intensity is 1.74 T. The magnetic loss P at a frequency of 400 Hz is tested using an AC BH instrument. 400Hz / 1.5T = 2.94W / kg, and the magnetic loss P at 1kHz 1kHz / 1.0T =3.51W / kg.
[0078] Example 3
[0079] This embodiment provides an iron-based amorphous nanocrystalline alloy, the chemical formula of which is Fe 82.2 Ni 5.7 Cr 3.6 Mo 4.9 Co 1.2 C 1. 2Cu 0.9 Br 0.3 .
[0080] The preparation method of the iron-based amorphous nanocrystalline alloy of this embodiment includes the following steps:
[0081] S1: According to the chemical formula Fe 82.2 Ni 5.7 Cr 3.6 Mo 4.9 Co 1.2 C 1.2 Cu 0.9 Br 0.3 , accurately weighing the raw materials of Fe, Ni, Cr, Mo, Co, C, Cu, and FeBr3 so that the atomic percentage of Fe is 82.5%, the atomic percentage of Ni is 5.7%, the atomic percentage of Cr is 3.6%, the atomic percentage of Mo is 4.9%, the atomic percentage of Co is 1.2%, the atomic percentage of C is 1.2%, the atomic percentage of Cu is 0.9%, and the atomic percentage of Br is 0.3%;
[0082] S2: placing the raw materials into an induction furnace at a temperature of 1600° C., heating them in a high-purity argon atmosphere until they melt into a liquid alloy, and simultaneously using electromagnetic stirring to ensure uniform distribution of the alloy components;
[0083] S3: The alloy liquid is passed through an improved twin-roll rolling mill, wherein the rolling temperature is controlled at 70°C, the rolling force is controlled at 20 kN, and the alloy liquid is rapidly solidified into an amorphous precursor strip at a cooling rate of 106°C / s in an argon protective atmosphere. The obtained amorphous precursor strip has a thickness of about 18 μm and a width of 220 mm.
[0084] S4: performing annealing heat treatment by contact heating, specifically comprising the following steps:
[0085] Heating: The amorphous precursor strip is heated to an initial annealing temperature of 315°C (lower than the crystallization temperature of the alloy) at a heating rate of 5°C / min;
[0086] First annealing: keep at 315℃ for 30 minutes;
[0087] Second annealing: heat to 501°C and keep warm for 20 minutes;
[0088] The third annealing: cooling to 570° C. and holding for 60 minutes, during which a tensile stress of 20 N and a magnetic field of 700 Gs perpendicular to the width direction of the amorphous precursor strip are applied.
[0089] Cooling: The amorphous precursor strip is cooled to room temperature at a rate of 10° C. / min by fan circulation cooling to obtain the iron-based amorphous nanocrystalline alloy.
[0090] The hysteresis loop of the Fe-based amorphous nanocrystalline alloy obtained by testing is as follows: Figure 5 As shown. Figure 5 The saturation magnetic induction intensity can be obtained as 1.78 T. The magnetic loss P at 400 Hz is tested using an AC BH instrument. 400Hz / 1.5T =3.17W / kg, and the magnetic loss P at 1kHz 1kHz / 1.0T =3.76W / kg.
[0091] Examples 4 to 8
[0092] The chemical compositions of the iron-based amorphous nanocrystalline alloys of Examples 4 to 8 are shown in Table 1.
[0093] Table 1 Different ratios of raw materials
[0094] Atomic percentage (%) Example 4 Example 5 Example 6 Example 7 Example 8 Fe 78 85 80 82 84 Ni 6.5 4.29 1.73 6.6 3.7 Cr 4.5 6 6 1.75 6.2 Mo 2.7 1.81 5.9 2.5 3.4 Co 6.3 0.8 4.37 4.7 1.1 C 0.8 1.1 0.8 1.4 0.9 Cu 1.1 0.9 1 0.75 0.6 Halogen group element I：0.1 Cl：0.1 Br：0.2 F：0.3 Cl：0.1
[0095] The preparation methods of the iron-based amorphous nanocrystalline alloys of Examples 4 to 8 are the same as those of Example 1.
[0096] Examples 9 to 12
[0097] The chemical formula of the iron-based amorphous nanocrystalline alloys of Examples 9 to 12 is the same as that of Example 1, and the preparation method is basically the same as that of Example 1. The differences are shown in Table 2.
[0098] Table 2 Different process parameters
[0099] Process parameter Example 9 Example 10 Example 11 Example 12 Induction furnace temperature (°C) 1500 1520 1580 1600 Rolling temperature (°C) 50 60 80 100 Rolling force (kN) 35 15 20 25 Rising rate (°C / min) 1 5 7 10 First annealing temperature (°C) 235 400 300 455 First time (min) 60 40 30 20 Second annealing temperature (°C) 490 500 480 520 Second time (min) 40 20 30 15 Third annealing temperature (°C) 530 560 540 570 Third time (min) 90 60 30 40 Tensile stress (N) 18 22 21 19 Magnetic field (Gs) 650 680 700 750 Cooling rate (°C / min) 30 15 18 20
[0100] The hysteresis loops of the iron-based amorphous nanocrystalline alloys obtained in Examples 4-12 all have a saturation magnetic induction of 1.7T or more. The magnetic loss P400Hz / 1.5T at a frequency of 400Hz and the magnetic loss P1kHz / 1.0T at a frequency of 1kHz of the alloys were tested by using an AC B-H instrument 400Hz / 1.5T ≤3.2W / kg, and P1kHz / 1.0T≤3.8W / kg. 1kHz / 1.0T ≤3.8W / kg.
[0101] In summary, the iron-based amorphous nanocrystalline alloy prepared by the preparation method of the present application has a saturation magnetic induction of not less than 1.7T, and excellent loss performance, and the magnetic loss P400Hz / 1.5T at a frequency of 400Hz is P400Hz / 1.5T≤3.2W / kg, and the magnetic loss P1kHz / 1.0T at a frequency of 1kHz is P1kHz / 1.0T≤3.8W / kg.
[0102] It can be seen that the Fe, Ni, Cr, Mo, Co, C, Cu and halogen elements in the present application interact with each other, have a synergistic effect on improving the saturation magnetic induction and reducing the loss and coercivity of the iron-based amorphous nanocrystalline alloy, and through suitable heat treatment design (contact heating treatment), the strip stress can be effectively eliminated, the grain uniform precipitation and refinement are promoted, and the magnetic field application can refine the magnetic domain to further improve the magnetic performance of the alloy. In addition, as known from the steps of the examples, the preparation method of the iron-based amorphous nanocrystalline alloy of the present application is annealed in a contact heating mode, so as to realize the reduction of harmful gas emission and meet the environmental protection requirements, and therefore is a method more suitable for practical production application.
[0103] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An iron-based amorphous nanocrystalline alloy, characterized in that: Its composition is shown in the following chemical formula: Fe a Ni b Cr c Mo d Co e C f Cu g M h , wherein M is a halogen element selected from one of F, Cl, Br, and I; and a, b, c, d, e, f, g, and h are the atomic percentage contents of the corresponding components: 78≤a≤85, 1.73≤b≤6.6, 1.75≤c≤6.2, 1.81≤d≤5.9, 0.8≤e≤6.3, 0.8≤f≤1.4, 0.6≤g≤1.1, 0.1≤h≤0.5, and a+b+c+d+e+f+g+h=100.
2. The iron-based amorphous nanocrystalline alloy according to claim 1, characterized in that: The oxygen content in the iron-based amorphous nanocrystalline alloy is lower than 9 ppm.
3. The iron-based amorphous nanocrystalline alloy according to claim 1, characterized in that: The iron-based amorphous nanocrystalline alloy is an iron-based amorphous nanocrystalline alloy strip; The width of the iron-based amorphous nanocrystalline alloy strip is ≥210 mm, and the thickness is ≤18 μm.
4. The iron-based amorphous nanocrystalline alloy according to claim 1, characterized in that: The magnetic induction intensity of the iron-based amorphous nanocrystalline alloy is greater than or equal to 1.7T.
5. A method for preparing an iron-based amorphous nanocrystalline alloy according to any one of claims 1 to 4, characterized in that: The following steps are involved: Weigh the raw metal elements Fe, Ni, Cr, Mo, Co, C and Cu and one of FeF3, FeCl3, FeBr3 and FeI3 according to the atomic percentage of the nanocrystalline soft magnetic alloy; Melting the raw materials in an inert gas atmosphere to obtain alloy liquid; Rolling the alloy liquid through twin rollers to obtain an amorphous precursor strip; The amorphous precursor strip is subjected to annealing heat treatment by contact heating to obtain the iron-based amorphous nanocrystalline alloy.
6. The preparation method according to claim 5, characterized in that The step of melting the raw materials in an inert gas atmosphere specifically comprises: The raw materials are melted in a high-purity argon protective atmosphere using an induction furnace, and the temperature of the induction furnace is 1500-1600°C.
7. The preparation method according to claim 5, characterized in that The rolling temperature of the twin-roll rolling is adjusted to 50-100° C., and the rolling force is controlled to be 15 kN-35 kN.
8. The preparation method according to claim 5, characterized in that The annealing heat treatment includes five stages: a heating stage, a first annealing stage, a second annealing stage, a third annealing stage, and a cooling stage. The heating stage is: heating the amorphous precursor strip to a first annealing temperature; The first annealing stage is: keeping the strip after the heating stage at the first annealing temperature for a first time; The second annealing stage is as follows: heating the strip that has undergone the first annealing to the second annealing temperature and keeping the temperature for a second time; The third annealing stage comprises: heating the strip that has undergone the second annealing to the third annealing temperature and keeping the temperature for a third time; The cooling stage is to cool the strip after the third annealing to room temperature.
9. The preparation method according to claim 8, characterized in that The heating stage is to heat the device to the first annealing temperature at a rate of 1 to 10°C / min; The first annealing temperature is not higher than the crystallization temperature of the alloy.
10. The preparation method according to claim 8, characterized in that The first annealing temperature is 235-455° C., and the first time is 20-60 minutes.
11. The preparation method according to claim 8, characterized in that The second annealing temperature is 490-520° C., and the second annealing time is 15-40 minutes.
12. The preparation method according to claim 8, characterized in that The third annealing temperature is 530-570° C., and the third annealing time is 30-90 minutes.
13. The preparation method according to claim 8, characterized in that During the third annealing process, a tensile stress of 18 to 22 N and a magnetic field of 650 to 750 Gs perpendicular to the width direction of the amorphous precursor strip are applied.
14. The preparation method according to claim 8, characterized in that The temperature reduction cooling stage is performed at a rate of 10 to 20° C. / min to cool to room temperature.
15. Use of the iron-based amorphous nanocrystalline alloy according to any one of claims 1 to 4 in soft magnetic materials, electromagnetic components, power electronic devices, sensors, and magnetic recording media.