Iron-based amorphous alloy and preparation method and application thereof

Abstract

The invention belongs to the technical field of amorphous alloy materials, and particularly relates to an iron-based amorphous alloy and a preparation method and application thereof, the chemical general formula of the iron-based amorphous alloy is FeaSi8-xBbCcMx, 79 < = a < = 81, 10 < b < 12, 0.9 < = c < = 1.5, 0.1 < = x < = 1; m comprises at least one of Mn, Cr, Zr and Nb. According to the iron-based amorphous alloy and the preparation method thereof, all the elements are optimally designed, the metal element M is doped in an Fe-Si-B-C alloy system, and the proportion of all the elements in the alloy is regulated and controlled, so that the obtained iron-based amorphous alloy has excellent soft magnetization performance, high saturation flux density and low coercive force can be considered, and the iron-based amorphous alloy has a very good application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of amorphous alloy materials, and particularly relates to an iron-based amorphous alloy and a preparation method and application thereof. BACKGROUND

[0002] Amorphous alloy soft magnetic material is a key basic material of modern power electronics and information technology, and is widely used in high-frequency transformers, magnetic amplifiers and inductance elements, etc. The performance of the amorphous alloy soft magnetic material directly affects the energy consumption and efficiency of electrical equipment. An ideal soft magnetic material needs to have high saturation magnetic induction (Bs) and low coercivity (Hc) at the same time, so as to effectively reduce the iron loss and improve the magnetic efficiency. However, the existing iron-based amorphous alloy is difficult to have both high saturation magnetic induction and low coercivity, which limits its application in power electronic devices. SUMMARY

[0003] In a first aspect, the application provides an iron-based amorphous alloy, the chemical general formula of the iron-based amorphous alloy is: Fe a Si 8-x B b C c M x wherein 79≤a≤81, 10<b<12, 0.9≤c≤1.5, 0.1≤x≤1. The M includes at least one of Mn, Cr, Zr and Nb.

[0004] The application has excellent soft magnetic properties by optimizing the design of each element, doping metal element M in the Fe-Si-B-C alloy system, and adjusting the ratio of each element in the alloy. The obtained iron-based amorphous alloy can have both high saturation magnetic induction and low coercivity, and has good application prospect.

[0005] Preferably, 79.5≤a≤80.5, 10.5≤b≤11.5, 0.9≤c≤1.2, 0.2≤x≤0.8; the a can be one of 79.5, 79.6, 79.7, 79.8, 79.9, 80.0, 80.1, 80.2, 80.3, 80.4, 80.5 or a range value of any two thereof; the b can be one of 10.5, 10.6, 10.7, 10.8, 10.9, 11.0, 11.1, 11.2, 11.3, 11.4, 11.5 or a range value of any two thereof; the c can be one of 0.9, 0.92, 0.95, 0.97, 0.99, 1.0, 1.02, 1.05, 1.07, 1.09, 1.1, 1.12, 1.15, 1.17, 1.19, 1.2 or a range value of any two thereof; the x can be one of 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or a range value of any two thereof. The iron-based amorphous alloy provided by the present application has better effect within the above range.

[0006] The inventors found that by doping metal element M into the Fe-Si-B-C alloy system, the soft magnetic properties of the material can be effectively improved. However, not all metal elements are suitable for the iron-based amorphous alloy system of the present application. For example, Cu and Al, which are doped into the iron-based amorphous alloy of the present application, will cause imbalance between the coercivity and the saturation magnetization. Preferably, when the metal element M is Mn, the soft magnetic material has better effect.

[0007] More preferably, the iron-based amorphous alloy is Fe 80 Si 7.8 B 11 C1Mn 0.2 , Fe 80 Si 7.6 B 11 C1Mn 0.4 , Fe 80 Si 7.4 B 11 C1Mn 0.6 or Fe 80 Si 7.2 B 11 C1Mn 0.8 .

[0008] Preferably, the thickness of the iron-based amorphous alloy is 20-25 μm.

[0009] In the second aspect of the present application, the above iron-based amorphous alloy is provided for use in magnetic materials.

[0010] In a third aspect, the present application provides a preparation method of the above-mentioned Fe-based amorphous alloy, comprising the following steps: S1, weighing each raw material according to stoichiometric ratio, melting to obtain an alloy ingot; S2, treating the alloy ingot by a single-roller spinning method to obtain the Fe-based amorphous alloy after cooling.

[0011] Preferably, in step S1, the melting is performed by vacuum arc melting, comprising the following steps: placing each raw material in a melting furnace, vacuumizing and melting under inert gas protection to obtain the alloy ingot.

[0012] Preferably, the current of the melting is 400-500 A, and the number of times of the melting is 4-8.

[0013] Preferably, the vacuumizing is to vacuumize the system to 3×10 -3 Pa-4×10 -3 Pa.

[0014] Preferably, in step S2, the single-roller spinning method comprises the following steps: placing the alloy ingot in a quartz tube of a single-roller spinning system, vacuumizing and melting the alloy ingot under inert gas protection, adding the molten alloy droplets to a copper roller, and obtaining the Fe-based amorphous alloy after cooling.

[0015] Preferably, in the single-roller spinning method, the rotating speed of the copper roller is 3200-3400 r / min.

[0016] Compared with the prior art, the present application has the following beneficial effects: By optimizing the design of each element, doping metal element M in the Fe-Si-B-C alloy system, and adjusting the ratio of each element in the alloy, the obtained Fe-based amorphous alloy has excellent soft magnetic properties, can balance high saturation magnetic induction and low coercivity, and has good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 XRD patterns of the Fe-based amorphous alloys of Examples 1-4.

[0018] Figure 2 Hysteresis loops of the Fe-based amorphous alloys of Examples 1-4 measured in a vibrating sample magnetometer (VSM).

[0019] Figure 3 Comprehensive soft magnetic properties of the Fe-based amorphous alloys of Examples 1-4. DETAILED DESCRIPTION

[0020] The following detailed embodiments further illustrate the content of the present invention. These embodiments do not constitute a limitation on the scope of protection of the present invention. Non-essential modifications and adjustments made by others based on the concept of the present invention still fall within the scope of protection of the present invention. The raw materials, reagents, or devices used in the embodiments are all available from conventional commercial sources or can be obtained through existing technical methods. Unless otherwise specified, the experimental or testing methods are conventional methods in the art.

[0021] The compositions of the iron-based amorphous alloys in Examples 1-4 and Comparative Examples 1-11 are shown in Table 1 below.

[0022] Table 1 The preparation methods of iron-based amorphous alloys in Examples 1-4 and Comparative Examples 1-11 include the following steps: S1. Weigh out each element according to its stoichiometric ratio. Based on the melting point of each element, place them in a copper crucible, with the element with the lower melting point at the bottom and the element with the higher melting point at the top. Evacuate the system to a vacuum of 3.5 × 10⁻⁶. - 3 The pressure is increased to -0.08 MPa, then high-purity argon gas (99.9% purity) is introduced as a protective gas until the pressure inside the furnace reaches -0.08 MPa. Gas introduction is then stopped, and melting begins. The melting process employs a vacuum arc melting method, with six arc melting cycles and a melting current of 450 A. The resulting alloy ingot is then obtained.

[0023] S2. Place the alloy ingot in the quartz tube of the single-roll quenching system, then place it in the induction coil, and evacuate to 3.5 × 10⁻⁶. -3 After Pa, argon gas is introduced as a protective gas, and the current is adjusted until the alloy is completely melted. Then, the alloy liquid is dripped onto a copper roller at a rotation speed of 3300 r / min. After cooling and forming, the iron-based amorphous alloy is obtained, and the thickness of the iron-based amorphous alloy is 22 μm.

[0024] In the components described in each embodiment and comparative example, the purity of each element is ≥99.9%.

[0025] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0026] The XRD characterization results of the iron-based amorphous alloys in Examples 1-4 are as follows: Figure 1 As shown, from Figure 1 It can be seen that the alloys in Examples 1-4 are all amorphous structures.

[0027] In order to verify the performance of the iron-based amorphous alloy, the products prepared in each example and the comparative example are subjected to the following performance tests, and the specific steps are as follows: The vibrating sample magnetometer (VSM) is used for testing. The alternating signal is induced in the detection coil through the vibration of the sample in the coil. The alternating voltage is proportional to the magnetic moment of the sample. The coercivity and saturation magnetization are obtained by analyzing and calculating the hysteresis loop measured by the VSM.

[0028] The coercivity and saturation magnetization calculated in each example and the comparative example are shown in Table 2.

[0029] The hysteresis loop of the iron-based amorphous alloy of Examples 1-4 is shown in Figure 2 It can be seen that the magnetization of the iron-based amorphous alloy of Examples 1-4 increases sharply with the increase of the magnetic field at low magnetic field, and then gradually reaches saturation, showing typical soft magnetic properties. The comprehensive soft magnetic properties of the iron-based amorphous alloy of Examples 1-4 are shown in Figure 3 It can be seen that as the amount of the doping element Mn changes in the range, the iron-based amorphous alloy of Examples 1-4 can still maintain a low coercivity (≤10.65 A / m) and a high saturation magnetization (≥1.41 T).

[0030] Table 2 As can be seen from Table 2, the iron-based amorphous alloy provided in the present application can better balance low coercivity and high saturation magnetization, Comparing Examples 1-4 and Comparative Examples 1-7, it can be seen that in the iron-based amorphous alloy provided in the present application, the content of Si, Mn, C and B is controlled in a certain range, which can well balance the low coercivity and high saturation magnetization.

[0031] Comparing Example 1 and Comparative Examples 8-11, it can be seen that in the iron-based amorphous alloy provided in the present application, if Cu or Al is used to replace all or part of the element M, it will cause abnormal growth of α-Fe(Si) grains, increase of magnetic anisotropy, and possibly induce hard magnetic boride precipitation, ultimately leading to an increase in coercivity and a decrease in saturation magnetization.

[0032] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A type of iron-based amorphous alloy, characterized in that, The general chemical formula of the iron-based amorphous alloy is: Fe a Si 8-x B b C c M x Where 79≤a≤81, 10<b<12, 0.9≤c≤1.5, 0.1≤x≤1; The M includes at least one of Mn, Cr, Zr and Nb.

2. The iron-based amorphous alloy as described in claim 1, characterized in that, 79.5≤a≤80.5, 10.5≤b≤11.5, 0.9≤c≤1.2, 0.2≤x≤0.

8.

3. The iron-based amorphous alloy as described in claim 1, characterized in that, M is Mn.

4. The iron-based amorphous alloy as described in claim 1, characterized in that, The iron-based amorphous alloy is Fe 80 Si 7.8 B 11 C1Mn 0.2 Fe 80 Si 7.6 B 11 C1Mn 0.4 Fe 80 Si 7.4 B 11 C1Mn 0.6 or Fe 80 Si 7.2 B 11 C1Mn 0.8 .

5. The iron-based amorphous alloy as described in claim 1, characterized in that, The thickness of the iron-based amorphous alloy is 20-25 μm.

6. The application of the iron-based amorphous alloy as described in any one of claims 1-5 in magnetic materials.

7. A method for preparing an iron-based amorphous alloy as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Weigh each raw material according to the stoichiometric ratio, melt them, and obtain an alloy ingot; S2. The alloy ingot is processed by single-roll quenching and cooled to obtain the iron-based amorphous alloy.

8. The method as described in claim 7, characterized in that, In step S1, the melting is carried out using vacuum arc melting, which includes the following steps: The raw materials are placed in a melting furnace, vacuumed, and melted under inert gas protection to obtain alloy ingots; The current for melting is 400-500A, and the number of melting cycles is 4-8.

9. The method as described in claim 7, characterized in that, In step S2, the single-roll quenching method includes the following steps: The alloy ingot is placed in the quartz tube of a single-roller quenching system, vacuumed, and melted under inert gas protection. The molten alloy droplets are added to a copper roller, and after cooling, the iron-based amorphous alloy is obtained.

10. The method as described in claim 7, characterized in that, In the single-roller quenching method, the rotational speed of the copper roller is 3200-3400 r / min.

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