Fe-Ho-B soft magnetic material and preparation method and application thereof

Abstract

The invention relates to a Fe-Ho-B soft magnetic material and a preparation method and application thereof, and belongs to the technical field of soft magnetic materials. The invention provides a Fe-Ho-B soft magnetic material, the atomic percentage expression of the Fe-Ho-B soft magnetic material is FeaHobBc, a is the atomic content corresponding to Fe element, and a is more than or equal to 80 and less than or equal to 86; b is the atom content corresponding to the Ho element, and 0.2 < = b < = 3; c is the atom content corresponding to the element B, and 13 < = c < = 17; a + b + c is equal to 100. According to the invention, the Ho element is added into a Fe-B nanocrystalline alloy system, so that the soft magnetic material with the coercive force up to 6.13-11.36 A / m and the saturation magnetization up to 1.61-1.84 T is obtained. According to the method, the relationship among the contents of Fe, Ho and B elements in the Fe-Ho-B soft magnetic material is determined, so that the soft magnetic performance is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soft magnetic materials, and particularly relates to a Fe-Ho-B soft magnetic material and a preparation method and application thereof. BACKGROUND

[0002] Soft magnetic material refers to some magnetic materials which are easy to be magnetized by external magnetic field and easy to demagnetize (i.e. the magnetism will basically disappear after the external magnetic field is removed), and is a kind of magnetic functional material with high magnetic permeability, low coercivity and small hysteresis loss, which can be used for efficient conversion, transmission and utilization of electric energy and magnetic energy. With the development of technology, the family of soft magnetic materials is growing, and the soft magnetic materials include electrical pure iron, silicon steel, iron-nickel alloy (permalloy), iron-cobalt alloy, soft magnetic ferrite, amorphous alloy (metallic glass) and nanocrystalline alloy, etc.

[0003] Soft magnetic material is the cornerstone of modern power and electronic industry, and is almost everywhere, for example, in the aspect of power transmission and conversion, the core of transformer uses soft magnetic material to raise or lower voltage; in the aspect of electric energy and mechanical energy conversion, the core of motor and generator uses soft magnetic material to realize energy conversion; in the aspect of magnetic shielding, the shell made of high magnetic permeability soft magnetic material isolates sensitive devices from external magnetic field; in the aspect of inductance element, the core of various inductors and choke coils uses soft magnetic material for filtering, energy storage, etc.; in the aspect of high-frequency electronic equipment, soft magnetic material can be made into transformer and filter core in switching power supply and communication equipment (mainly using soft magnetic ferrite); in the aspect of electromagnet, soft magnetic material can be used to generate controllable magnetic field for relays, magnetic separators, magnetic resonance imaging, etc.

[0004] Traditional soft magnetic materials have their own limitations, for example, although electrical pure iron has high saturation magnetic induction intensity (Bs), it has low resistivity (p) and large eddy current loss in alternating magnetic field; silicon steel has high saturation magnetic induction intensity and large eddy current loss, and can only be applied at low frequency and has high cost; permalloy has low coercivity (Hc), low loss (W) and high magnetic permeability (μ), but its saturation magnetic induction intensity is low and can only be applied to some small electronic components; although soft magnetic ferrite has high resistivity and low high-frequency loss, its saturation magnetic induction intensity and magnetic permeability are low, which limits its application. Amorphous and nanocrystalline soft magnetic materials have excellent performances such as high saturation magnetic induction intensity, low coercivity, high magnetic permeability, high resistivity, low loss and high frequency characteristics, and can well solve the limitations of traditional soft magnetic materials in use. However, if the saturation magnetic induction intensity of Fe-based alloy soft magnetic material is to be further improved, the content of Fe therein needs to be as high as possible, but this will lead to the decrease of the content of non-metallic elements, thereby adversely affecting other magnetic properties of the soft magnetic material.

[0005] Chinese patent CN105220082A discloses a Gd-based amorphous nanocrystalline composite material with high Curie temperature and high refrigeration capacity and a preparation method thereof. When the Gd content in the Gd-based amorphous nanocrystalline composite material is increased to more than 80%, the Gd-based amorphous nanocrystalline composite material not only has a high Curie temperature, but also has a high magnetic entropy change. However, the material is a Gd-based amorphous nanocrystalline material, and the purpose is to increase the Curie temperature and the magnetic entropy change to obtain a magnetic refrigeration material, which is difficult to bring beneficial reference value to the research and development of Fe-based alloys.

[0006] Chinese patent CN116031037A discloses a rare earth ion doped soft magnetic alloy, a soft magnetic composite material and a preparation method thereof. The rare earth ion doped soft magnetic alloy is composed of Fe, Si, Al, N and Re, and Re is a rare earth element. In the rare earth ion doped soft magnetic alloy, the content of Fe is 82-85wt%. However, the saturation magnetization is low, and the coercivity of the soft magnetic alloy is not concerned, and the type of doped rare earth ions is complex.

[0007] Therefore, it is still necessary to research and develop the element composition and preparation method of Fe-based soft magnetic materials to further improve their magnetic properties. SUMMARY

[0008] The purpose of the present application is to overcome the shortcomings of the prior art and provide an Fe-Ho-B soft magnetic material, a preparation method and application thereof.

[0009] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides an Fe-Ho-B soft magnetic material, and the atomic percentage expression of the Fe-Ho-B soft magnetic material is Fe a Ho b B c , wherein a is the atomic content corresponding to the Fe element, 80≤a≤86; b is the atomic content corresponding to the Ho element, 0.2≤b≤3; c is the atomic content corresponding to the B element, 13≤c≤17; and a+b+c=100.

[0010] The Fe-Ho-B nanocrystalline alloy obtained by adding the Ho element to the Fe-B alloy system has excellent soft magnetic properties, low coercivity and high saturation magnetization.

[0011] As a preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, in the Fe-Ho-B soft magnetic material, 83.0≤a≤84.5.

[0012] As a preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, in the Fe-Ho-B soft magnetic material, 0.5≤b≤2.0.

[0013] As a preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, in the Fe-Ho-B soft magnetic material, 14.5≤c≤15.5.

[0014] As a preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, in the Fe-Ho-B soft magnetic material, a=85-b. At this time, c=15.

[0015] As a preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, the thickness of the Fe-Ho-B soft magnetic material is 18-22 μm.

[0016] As a more preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, the thickness of the Fe-Ho-B soft magnetic material is 20 μm.

[0017] As a more preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, the atomic percentage expression of the Fe-Ho-B soft magnetic material is Fe 84.5 Ho 0.5 B 15 . Its coercive force is low, being 11.36 A / m, and its saturation magnetization is high, being 1.84 T.

[0018] As a more preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, the atomic percentage expression of the Fe-Ho-B soft magnetic material is Fe 84.0 Ho 1.0 B 15 . Its coercive force is low, being 8.43 A / m, and its saturation magnetization is high, being 1.64 T.

[0019] As a more preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, the atomic percentage expression of the Fe-Ho-B soft magnetic material is Fe 83.5 Ho 1.5 B 15 . Its coercive force is low, being 6.13 A / m, and its saturation magnetization is high, being 1.62 T.

[0020] As a more preferred embodiment of the Fe-Ho-B soft magnetic material of the present application, the atomic percentage expression of the Fe-Ho-B soft magnetic material is Fe 83.0 Ho 2.0 B 15 . Its coercive force is low, being 6.96 A / m, and its saturation magnetization is high, being 1.61 T.

[0021] In a second aspect, the present application provides a preparation method of the Fe-Ho-B soft magnetic material, characterized by comprising the following steps: S1: Fe, Ho and B element single substance raw materials are weighed according to the stoichiometric ratio of the Fe-Ho-B soft magnetic material, and are placed according to the order of low melting point to high melting point, vacuum is drawn, and then inert gas is introduced to carry out arc melting to form an alloy ingot; S2: The alloy ingot of step S1 is placed in a quartz tube of a high-vacuum single-roller spinning system, vacuum is drawn, and then inert gas is introduced to melt the alloy ingot of step S1 into alloy droplets, which are dropped on a copper roller to be cooled and formed to obtain the Fe-Ho-B soft magnetic material.

[0022] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1, each element single substance raw material is sequentially cleaned by ultrasonic cleaning in petroleum ether and anhydrous ethanol before use.

[0023] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1 or S2, vacuum is drawn to a pressure of 3.5×10 -3 ~ 5×10 -3 Pa.

[0024] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1 or S2, vacuum is drawn to a pressure of 3.5×10 -3 Pa.

[0025] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1 or S2, the inert gas is at least one selected from argon, nitrogen and helium.

[0026] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1 or S2, the inert gas is argon.

[0027] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1 or S2, the purity of the inert gas introduced is 99.95-99.99wt%.

[0028] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1 or S2, the purity of the inert gas introduced is 99.99wt%.

[0029] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material of the present application, in step S1, the inert gas is introduced to a pressure of -0.08-0.03MPa.

[0030] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S1, the inert gas is introduced to a pressure of -0.08 Mpa.

[0031] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S1, the smelting current is 200-500 A.

[0032] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S1, the smelting current is 450 A.

[0033] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S1, the smelting is performed until all the elemental substance raw materials are completely melted to form an alloy ingot, the alloy ingot is cooled, the alloy ingot is turned over, and the smelting is performed again and magnetic stirring is performed.

[0034] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S1, the arc smelting is repeated 5-10 times.

[0035] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S1, the arc smelting is repeated 6 times.

[0036] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S2, the inert gas is introduced to a pressure of 350-400 mbar.

[0037] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S2, the inert gas is introduced to a pressure of 400 mbar.

[0038] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S2, the alloy ingot is first melted at a current of 200-300 A, and then completely melted at a current of 400-500 A.

[0039] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S2, the alloy ingot is first melted at a current of 300 A, and then completely melted at a current of 450 A.

[0040] As a preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S2, the rotating speed of the copper roller is 3200-3400 r / min.

[0041] As a more preferred embodiment of the preparation method of the Fe-Ho-B soft magnetic material, in step S2, the rotating speed of the copper roller is 3300 r / min.

[0042] In a third aspect, the application provides an application of the Fe-Ho-B soft magnetic material in preparing magnetic materials, such as transformers, sensors, etc.

[0043] Compared with the prior art, the application has the following beneficial effects: 1. The application adds Ho element in the Fe-B nanocrystalline alloy system, optimizes the soft magnetic properties of the nanocrystalline alloy material, and obtains the Fe-Ho-B soft magnetic material with a coercive force of 6.13-11.36 A / m and a saturation magnetization of 1.61-1.84 T. The Fe-Ho-B soft magnetic material sharply rises with the increase of the magnetic field at low magnetic field and then gradually reaches saturation, showing typical soft magnetic properties. If the Ho element is replaced by other elements, such as Gd or Dy, better results cannot be achieved.

[0044] 2. The application determines the relationship between the contents of Fe, Ho and B in the Fe-Ho-B soft magnetic material, so as to further improve the soft magnetic properties of the Fe-Ho-B soft magnetic material. Especially, the content of Ho element is too large or too small, which cannot achieve lower coercive force and higher saturation magnetization. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 X-ray diffraction images of Fe-Ho-B nanocrystalline alloys prepared in Examples 1-4 and Comparative Example 2 of the application; Figure 2 Saturation magnetization curves of Fe-Ho-B nanocrystalline alloys prepared in Examples 1-4 and Comparative Example 2 of the application; Figure 3 Saturation magnetization curves of nanocrystalline alloys prepared in Comparative Examples 1, 3 and 4 of the application. DETAILED DESCRIPTION

[0046] In order to better illustrate the purpose, technical scheme and advantages of the application, the application will be further described below in combination with specific examples. Unless otherwise specified, other materials, reagents, etc. used in the examples can be obtained from commercial channels.

[0047] Example 1 Fe-Ho-B nanocrystalline alloy with an atomic percentage expression of Fe84.5Ho0.5B15 and a preparation method thereof A Fe-Ho-B nanocrystalline alloy with a thickness of 20 μm and an atomic percentage expression of Fe 84.5 Ho 0.5 B 15 The preparation method is as follows: (1) The atomic percentage expression is Fe 84.5 Ho 0.5 B 15 The atomic ratio of the element ratio (atomic ratio) is taken as the Fe, Ho and B element substance, and the purity is not less than 99.9%. Among them, Fe 95.07 g, Ho 1.66 g, B 3.27 g, the element substance raw material is cleaned in petroleum ether and anhydrous ethanol in turn, and the cleaned element substance raw material is obtained.

[0048] (2) The element raw material in step (1) is placed in the copper crucible in order according to the melting point of the element raw material, so that the element raw material with low melting point is located at the bottom and the element raw material with high melting point is located at the top. The pressure in the furnace cavity is reduced to 3.5x10 -3 Pa, and then high-purity argon gas with a purity of 99.99wt% is introduced as a protective gas until the pressure in the furnace cavity reaches-0.08Mpa. Then, arc melting is carried out with a current of 450A. After the alloy ingot is completely melted, it is cooled, turned over, melted again and magnetically stirred. The above method is repeated for 6 times to obtain the alloy ingot.

[0049] (3) The alloy ingot prepared in step (2) is placed in a quartz tube of a high-vacuum single-roller spinning system. After vacuumizing, high-purity argon gas with a purity of 99.99wt% is introduced to a pressure of 400mbar. The alloy ingot is first melted at a current of 300A, and then completely melted at a current of 450A to obtain alloy droplets. The alloy droplets are dropped on a rapidly rotating copper roller at a speed of 3300r / min, and then cooled and formed to obtain an Fe-Ho-B nanocrystalline alloy with an atomic percentage expression of Fe 84.5 Ho 0.5 B 15 .

[0050] Example 2 Fe-Ho-B nanocrystalline alloy with an atomic percentage expression of Fe84.0Ho1.0B15 and its preparation method An Fe-Ho-B nanocrystalline alloy with a thickness of 20μm and an atomic percentage expression of Fe 84.0 Ho 1.0 B 15 The preparation method of the Fe-Ho-B nanocrystalline alloy is different from that of Example 1. The atomic percentage expression of the Fe-Ho-B nanocrystalline alloy is Fe 84.0 Ho 1.0 B 15 , and the used Fe is 93.48 g, Ho is 3.29 g, and B is 3.23 g.

[0051] Example 3 An Fe-Ho-B nanocrystalline alloy of atomic percentage expression Fe83.5Ho1.5B15 and a method for producing the same An Fe-Ho-B nanocrystalline alloy of atomic percentage expression Fe 83.5 Ho 1.5 B 15 with a thickness of 20 μm was produced. The method for producing the Fe-Ho-B nanocrystalline alloy was different from that of Example 1 in that the atomic percentage expression of the Fe-Ho-B nanocrystalline alloy was Fe 83.5 Ho 1.5 B 15 , and Fe 91.93 g, Ho 4.88 g, and B 3.2 g were used.

[0052] Example 4 An Fe-Ho-B nanocrystalline alloy of atomic percentage expression Fe83.0Ho2.0B15 and a method for producing the same An Fe-Ho-B nanocrystalline alloy of atomic percentage expression Fe 83.0 Ho 2.0 B 15 with a thickness of 20 μm was produced. The method for producing the Fe-Ho-B nanocrystalline alloy was different from that of Example 1 in that the atomic percentage expression of the Fe-Ho-B nanocrystalline alloy was Fe 83.0 Ho 2.0 B 15 , and Fe 90.40 g, Ho 6.43 g, and B 3.16 g were used.

[0053] Comparative Example 1 An Fe-B nanocrystalline alloy of atomic percentage expression Fe85B15 and a method for producing the same 85 B 15 with a thickness of 20 μm was produced. The method for producing the Fe-B nanocrystalline alloy was different from that of Example 1 in that the atomic percentage expression of the Fe-B nanocrystalline alloy was Fe 85 B 15 , and Fe 96.7 g and B 3.3 g were used.

[0054] Comparative Example 2 An Fe-Ho-B nanocrystalline alloy of atomic percentage expression Fe82.5Ho2.5B15 and a method for producing the same An Fe-Ho-B nanocrystalline alloy of atomic percentage expression Fe 82.5 Ho 2.5 B 15 with a thickness of 20 μm was produced. The method for producing the Fe-Ho-B nanocrystalline alloy was different from that of Example 1 in that the atomic percentage expression of the Fe-Ho-B nanocrystalline alloy was Fe 82.5 Ho 2.5 B 15Fe 88.91 g, Ho 7.96 g, B 3.31 g.

[0055] Example 1 An Fe-Ho-B nanocrystalline alloy having an atomic percentage expression of Fe A Fe-Ho-B nanocrystalline alloy having an atomic percentage expression of Fe 83 Ho2B 15 was prepared. The difference between the preparation method of the Fe-Ho-B nanocrystalline alloy and that of Example 1 is that the atomic percentage expression of the Fe-Ho-B nanocrystalline alloy is Fe 83 Ho2B 15 , Fe 90.68 g, Ho 6.15 g, B 3.17 g.

[0056] Example 2 An Fe-Dy-B nanocrystalline alloy having an atomic percentage expression of Fe A Fe-Dy-B nanocrystalline alloy having an atomic percentage expression of Fe 83 Dy2B 15 was prepared. The difference between the preparation method of the Fe-Dy-B nanocrystalline alloy and that of Example 1 is that the atomic percentage expression of the Fe-Dy-B nanocrystalline alloy is Fe 83 Dy2B 15 , Fe 90.49 g, Dy 6.34 g, B 3.17 g.

[0057] Test Example 1 X-ray diffraction analysis of the Fe-Ho-B nanocrystalline alloys prepared in Examples 1-4 and Comparative Example 2 The Fe-Ho-B nanocrystalline alloys prepared in Examples 1-4 and Comparative Example 2 were subjected to X-ray diffraction analysis.

[0058] The results are shown in Table 1. Figure 1 The Fe-Ho-B nanocrystalline alloys prepared in Examples 1-4 and Comparative Example 2 were subjected to X-ray diffraction analysis.

[0059] Test Example 2 Coercivity and saturation magnetization of the nanocrystalline alloys prepared in Examples 1-4 and Comparative Examples 1-4 were detected. The VSM (vibrating sample magnetometer) was used for the test. An alternating signal was induced in the detection coil by the vibration of the sample in the coil. The alternating voltage was proportional to the magnetic moment of the sample. The hysteresis loop was measured and analyzed to obtain the coercivity and saturation magnetization of the sample (the nanocrystalline alloys prepared in Examples 1-4 and Comparative Examples 1-4).

[0060] Table 1 As shown in Table 1, in Examples 1-4 of this application, the saturation magnetization of the samples showed a single change with varying amounts of Ho dopant, exhibiting a decreasing trend. The addition of Ho to the Fe-B alloy system in Examples 1-4 significantly altered the soft magnetic properties of the final Fe-Ho-B nanocrystalline alloy samples, resulting in a significant increase in saturation magnetization and a significant decrease in coercivity, thus significantly improving the soft magnetic properties of the alloy samples. In Comparative Example 1, which did not contain Ho, the saturation magnetization was low and the coercivity was excessively high. In Comparative Example 2, the Ho content increased while the Fe content decreased, leading to a decrease in the saturation magnetization and an increase in the coercivity of the Fe-Ho-B nanocrystalline alloy. In Comparative Example 3, when Ho was replaced with Gd, the saturation magnetization was low and the coercivity was excessively high. In Comparative Example 4, when Ho was replaced with Dy, the saturation magnetization was low and the coercivity was excessively high. The results show that the nanocrystalline alloys prepared in Examples 1-4 have superior soft magnetic properties compared to those prepared in Comparative Examples 1-4. If Ho is not added, or if Ho is replaced with other elements, or if the content of Ho is changed, the prepared nanocrystalline alloys cannot achieve good soft magnetic properties.

[0061] like Figure 2 As shown, the magnetization of the Fe-Ho-B nanocrystalline alloys in Examples 1 to 4 increases sharply with the increase of the magnetic field under low magnetic field and then gradually reaches saturation, indicating that the Fe-Ho-B nanocrystalline alloys exhibit typical soft magnetic properties.

[0062] like Figure 3 As shown, the nanocrystalline alloys prepared in Comparative Examples 1, 3 and 4 cannot achieve good soft magnetic properties.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A Fe-Ho-B soft magnetic material, characterized in that, The atomic percentage expression of the Fe-Ho-B soft magnetic material is Fe a Ho b B c Wherein, a is the atomic content corresponding to the Fe element, 80≤a≤86; b is the atomic content corresponding to the Ho element, 0.2≤b≤3; c is the atomic content corresponding to the B element, 13≤c≤17; and a+b+c=100.

2. The Fe-Ho-B soft magnetic material of claim 1, wherein, In the Fe-Ho-B soft magnetic material, 83.0≤a≤84.

5.

3. The Fe-Ho-B soft magnetic material of claim 1, wherein, In the Fe-Ho-B soft magnetic material, 0.5≤b≤2.

0.

4. The Fe-Ho-B soft magnetic material of claim 1, wherein, In the Fe-Ho-B soft magnetic material, 14.5≤c≤15.

5.

5. The Fe-Ho-B soft magnetic material of claim 1, wherein, In the Fe-Ho-B soft magnetic material, a=85-b.

6. The Fe-Ho-B soft magnetic material of claim 1, wherein, The thickness of the Fe-Ho-B soft magnetic material is 18-22 μm.

7. The method of producing the Fe-Ho-B soft magnetic material according to any one of claims 1 to 6, characterized by, The method comprises the following steps: S1: Fe, Ho and B element single substance raw materials are weighed according to the stoichiometric ratio of the Fe-Ho-B soft magnetic material, and are placed according to the order of low melting point to high melting point, then inert gas is introduced after vacuumizing, electric arc smelting is carried out, and alloy ingot is formed; S2: the alloy ingot of step S1 is placed in a quartz tube of a high vacuum single roll spinning system, inert gas is introduced after vacuumizing, the alloy ingot of step S1 is melted into alloy droplets, and is dropped on a copper roll to be cooled and formed, so that the Fe-Ho-B soft magnetic material is obtained.

8. The method of claim 7, wherein the Fe-Ho-B soft magnetic material is prepared by the steps of: preparing a master alloy of Fe-Ho-B; and adding a flux to the master alloy to form the Fe-Ho-B soft magnetic material. In step S1, the inert gas is introduced to a pressure of -0.08-0.03 Mpa.

9. The method of claim 7, wherein the Fe-Ho-B soft magnetic material is prepared by the steps of: preparing a master alloy of Fe-Ho-B; and adding a flux to the master alloy to form the Fe-Ho-B soft magnetic material. In step S2, the inert gas is introduced to a pressure of 350-400 mbar.

10. Use of the Fe-Ho-B soft magnetic material of any one of claims 1-6 in the preparation of a magnetic material.

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