Iron-based amorphous nanocrystalline magnetic core for electric appliance and preparation method of iron-based amorphous nanocrystalline magnetic core

Abstract

The invention relates to an iron-based amorphous nanocrystalline magnetic core for an electric appliance and a preparation method of the iron-based amorphous nanocrystalline magnetic core. The iron-based amorphous nanocrystalline magnetic core comprises an amorphous nanocrystalline alloy belt with the molecular formula of Fe B S < c > X < d >-Fe B S < c > X < d > (at) Fe < e > B < f > S < g > Y < h > n (at) SiO2, the Fe B S < c > X < d >-Fe B S < c > X < d > is a double-layer amorphous nanocrystalline alloy belt; according to the Fe B S < c > X < d >-Fe B S < c > X < d >-Fe < e > B < f > S < g > Y < hn >-Fe < e > B < f > S < g > Y < hn >-Fe < e > B < f > S < g > Y < hn >-Fe < e > B < f > S < g > Y < hn > is used as a coating layer. According to the preparation method, the iron-based amorphous nanocrystalline magnetic core for the electric appliance is prepared, and more than or equal to two layers of multi-layer FeeBfSigYh amorphous alloy gradient coating layers are sprayed in a gradient manner on the basis of an upper-layer amorphous nanocrystalline alloy belt FeaBbSicXd and a lower-layer amorphous nanocrystalline alloy belt FeaBbSicXd, so that the situation that the single-layer amorphous nanocrystalline alloy belt FeaBbSicXd is stretched by external force or the alloy is molded, the alloy belt is cracked, and part of the coating layers fall off or crack is prevented; the problem of exposed internal iron-containing matrix alloy composite components is solved, and reduction of local corrosion resistance caused by further internal corrosion is avoided; amorphous silicon deposition / reoxidation is carried out on the double-layer FeaBbSicXd alloy belt to form a silicon dioxide layer, and the problem that a passive film is single in function is solved.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic materials, in particular to an iron-based amorphous nanocrystalline magnetic core for electrical appliances and a preparation method thereof. Background Art

[0002] The disordered structure of iron-based amorphous alloy composites (including iron, silicon, boron, niobium, copper, etc.) makes its magnetic anisotropy averaged and reduced, reducing the eddy current loss caused by insulation between iron-based amorphous alloy composites, and thus has excellent soft magnetic properties. Therefore, inductors made of iron-based amorphous alloy composites are widely used in electricity, electronics, power grids and other instruments and equipment for storing, transmitting and converting electromagnetic energy and information, and play a very important role in the national economy and daily life.

[0003] The corrosion resistance of alloys is an important protective property of alloys. By adding Cr elements to amorphous alloys, the corrosion-resistant elements Zr and Ti can be enriched on the amorphous surface to form a stable passivation film, thereby improving the corrosion resistance of Cu-based amorphous. In addition, the Cr element promotes the self-passivation of the iron-based amorphous alloy composite material in sodium chloride solution, thereby reducing its corrosion rate. However, at present, this passivation film has a single function, and external force stretching or shaping of the alloy can easily lead to cracking of the alloy strip, partial shedding or cracking of the passivation film, and exposed internal iron-containing matrix alloy composite components, and further erosion to the inside, resulting in local corrosion resistance reduction, magnetic ability reduction, etc. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an iron-based amorphous nanocrystalline magnetic core for electrical appliances and a preparation method thereof. The present invention prepares an iron-based amorphous nanocrystalline magnetic core for electrical appliances by forming an upper and lower double layer of amorphous nanocrystalline alloy strips Fe a B b Si c X d Based on the gradient spraying ≥ 2 layers of multi-layer Fe e B f Si g Y h Amorphous alloy gradient coating layer to prevent single-layer amorphous nanocrystalline alloy with Fe a B b Si c X d Under external force stretching or alloy shaping, the alloy strip cracks, part of the coating layer falls off or cracks, which solves the problem of exposed internal iron-containing matrix alloy composite components and avoids further internal erosion, resulting in local corrosion resistance reduction; the double-layer Fe a B b Si c X dThe alloy strip is deposited with amorphous silicon / reoxidized to form a silicon dioxide layer, thus solving the problem of single function of the passivation film.

[0005] The first object of the present invention is to provide an iron-based amorphous nanocrystalline magnetic core, the iron-based amorphous nanocrystalline magnetic core comprising a molecular formula of Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2 amorphous nanocrystalline alloy ribbon; Fe a B b Si c X d -Fe a B b Si c X d It is a double-layer amorphous nanocrystalline alloy ribbon;

[0006] The Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2 with Fe e B f Si g Y hn As the coating layer, the Fe e B f Si g Y hn The surface is coated with a silicon dioxide passivation layer;

[0007] The X is selected from a metal element and / or a metal alloy, wherein the metal element is selected from at least one of nickel, manganese, carbon, molybdenum, cobalt, aluminum, and copper; the metal alloy is selected from two or more alloys of nickel, manganese, carbon, molybdenum, nickel, cobalt, aluminum, and copper; a, b, c, and d are atomic ratios, wherein a≥0.6, 0.01≤b+c≤0.4, d≤0.3, and a+b+c+d=1;

[0008] The Y is selected from a single metal element containing chromium, niobium, zirconium, or titanium, or an alloy of two or more of chromium, niobium, zirconium, or titanium; e, f, g, and hn are atomic number ratios, e+f+g+hn=1, h1>h1>h2>h3>……>hn≥0.05, and n≥2.

[0009] In some embodiments of the present invention, Fe e B f Si g Y hn The mass proportion of each coating layer is Fe a B b Si c X d -Fe a B b Si c X d 0.05wt%-0.3wt%.

[0010] In some embodiments of the present invention, the thickness of the silicon dioxide passivation layer is 0.5-5 nm.

[0011] In the present invention, each additional layer of Fe alloy layer e B f Si g Y hn The h of the Y source is reduced, that is, Fe e B f Si g Y hn The content of Y source (chromium, niobium, zirconium, titanium metal) in the alloy is reduced.

[0012] In the present invention, Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2, from inside to outside: upper and lower layers of Fe a B b Si c X d Alloy strip, first amorphous alloy coating layer Fe e B f Si g Y h1 , the second amorphous alloy coating layer Fe e B f Si g Y h2, the third amorphous alloy coating layer Fe e B f Si g Y h3 ...nth amorphous alloy gradient coating layer Fe e B f Si g Y hn The outermost layer is a 0.5-5nm silicon dioxide layer.

[0013] The second object of the present invention is to provide a method for preparing the iron-based amorphous nanocrystalline magnetic core for electrical appliances, comprising the following steps:

[0014] S1. In an inert atmosphere, an iron source, a boron source, a silicon source, and an X source are mixed and heated in a heating device to obtain an iron-boron-silicon X alloy (Fe a B b Si c X d alloy);

[0015] S2, melting the iron-boron-silicon X alloy in an inert atmosphere, and performing vacuum atomization spraying, spraying it onto a copper roller, and cutting to obtain an amorphous nanocrystalline alloy strip Fe a B b Si c X d ; Two amorphous nanocrystalline alloy strips of the same width Fe a B b Si c X d Align, fit and extrude to obtain a double layer of amorphous nanocrystalline alloy ribbon Fe a B b Si c X d -Fe a B b Si c X d ;

[0016] S3-1, using iron source, boron source, silicon source and Y source, heating and melting to obtain the first alloy Fe e B f Si g Y h1 , e+f+g+h1=1; in an inert atmosphere, the first alloy is heated and melted, and vacuum atomized and sprayed onto the amorphous nanocrystalline alloy band Fe a B b Si c X d -Fe a B b Si c X dThe surface is coated with a first amorphous alloy coating layer Fe e B f Si g Y h1 Amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d , namely Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 ;

[0017] S3-2, using iron source, boron source, silicon source and Y source, heating and melting to obtain the first alloy Fe e B f Si g Y h12 , e+f+g+h2=1; in an inert atmosphere, the second alloy is heated and melted, and vacuum atomized and sprayed onto the amorphous nanocrystalline alloy band Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 The surface is coated with a second amorphous alloy coating layer Fe e B f Si g Y h2 Amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 , namely Fe a Bb Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 @Fe e B f Si g Y h2 ;

[0018] S3-3, repeat step S3-2, gradually reduce the amount of Y source added, and obtain n layers of amorphous alloy gradient coating layer Fe e B f Si g Y hn , n≥2, that is, amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn ;

[0019] S4, the amorphous nanocrystalline alloy strip Fe obtained in step S3-3 a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn , sent to the fluidized bed, in an inert atmosphere, a gaseous silicon source is used to form amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hnAn amorphous silicon deposition layer is formed on the surface, and then a silicon dioxide passivation layer is formed on the surface of the silicon deposition layer after oxidation treatment in a protective gas containing oxygen, so that an amorphous nanocrystalline alloy strip Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2;

[0020] S5, the amorphous nanocrystalline alloy strip Fe obtained in step S4 a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2 is sent to a mold and wound to obtain magnetic cores of different shapes, and finally the iron-based amorphous nanocrystalline magnetic core is obtained.

[0021] In some embodiments of the present invention, in step S1, the iron source is selected from elemental iron or iron alloy; the elemental iron is at least one of nano iron powder, iron ingot, and iron sheet, and the iron alloy includes at least one of iron boron, iron silicon, and iron boron silicon alloy;

[0022] The boron source is selected from elemental boron and / or a boron alloy; the elemental boron is selected from at least one of boron powder, amorphous boron and single crystal boron; the boron alloy is selected from iron boron, nickel boron, copper boron, cobalt boron, nickel boron, copper boron alloy or an alloy of boron and two or more metals among iron, nickel, copper, cobalt, nickel and copper;

[0023] The silicon source is selected from silicon and / or silicon alloy; the silicon is selected from at least one of silicon powder, single crystal silicon and polycrystalline silicon; the silicon alloy is selected from aluminum silicon, iron silicon, nickel silicon, copper silicon, cobalt silicon, nickel silicon, copper boron alloy or an alloy of two or more metals among iron, nickel, copper, cobalt, nickel and copper and silicon;

[0024] The X source is selected from a metal element and / or a metal alloy, wherein the metal element is selected from at least one of nickel, manganese, carbon, molybdenum, cobalt, aluminum, and copper; the metal alloy is selected from two or more alloys of nickel, manganese, carbon, molybdenum, nickel, cobalt, aluminum, and copper;

[0025] The inert gas in the inert atmosphere is selected from at least one of nitrogen, helium, argon and xenon;

[0026] The smelting temperature is 1300-2200° C. and the smelting time is 5-30 minutes.

[0027] In some embodiments of the present invention, in step S2, the rotation speed of the copper roller is 1000-10000 rpm;

[0028] The amorphous nanocrystalline alloy with Fe a B b Si c X d Width ≤ 80 mm, preferably 1-8 mm;

[0029] The amorphous nanocrystalline alloy with Fe a B b Si c X d Thickness ≤ 20mm, preferably 0.1-4mm;

[0030] The amorphous nanocrystalline alloy with Fe a B b Si c X d Length ≤ 20000mm, preferably 10-1000mm;

[0031] The vacuum atomization pressure is 0.4-1.5MPa;

[0032] The two amorphous nanocrystalline alloy strips Fe a B b Si c X d Align and bond for 3-50 minutes at 0.2-1.0 GPa to ensure full contact.

[0033] In some embodiments of the present invention, in step S3-1 or S3-2, the iron source is selected from elemental iron or iron alloy; the elemental iron is at least one of nano iron powder, iron ingot, and iron sheet, and the iron alloy includes at least one of iron boron, iron silicon, and iron boron silicon alloy;

[0034] The boron source is selected from elemental boron and / or a boron alloy; the elemental boron is selected from at least one of boron powder, amorphous boron and single crystal boron; the boron alloy is selected from iron boron, nickel boron, copper boron, cobalt boron, nickel boron, copper boron alloy or an alloy of boron and two or more metals among iron, nickel, copper, cobalt, nickel and copper;

[0035] The silicon source is selected from silicon and / or silicon alloy; the silicon is selected from at least one of silicon powder, single crystal silicon and polycrystalline silicon; the silicon alloy is selected from aluminum silicon, iron silicon, nickel silicon, copper silicon, cobalt silicon, nickel silicon, copper boron alloy or an alloy of two or more metals among iron, nickel, copper, cobalt, nickel and copper and silicon;

[0036] The Y contains a single metal element of chromium, niobium, zirconium or titanium, or an alloy of two or more of chromium, niobium, zirconium or titanium;

[0037] In some embodiments of the present invention, when filling the inert gas in step 2 and step 3, vacuum is required, and the vacuum degree is less than 3Pa.

[0038] In some embodiments of the present invention, in step S3-1 or S3-2, the heating and smelting temperature is 1300-2200° C. and the time is 5-30 min;

[0039] The inert gas in the inert atmosphere is selected from at least one of nitrogen, helium, argon and xenon;

[0040] The vacuum atomization pressure is 0.4-1.5MPa.

[0041] In some embodiments of the present invention, during the multiple spraying processes, each additional coating alloy layer Fe e B f Si g Y hn The Y source addition amount of the alloy is reduced, and Fe e B f Si g Y hn The h value in the alloy becomes lower and lower, that is, the proportion of Y source in each layer becomes lower and lower, forming a gradient decreasing trend.

[0042] In some embodiments of the present invention, in step S4, the gaseous silicon source is selected from monosilane and / or disilane;

[0043] The temperature of silicon deposition is 300-550°C;

[0044] The oxidation treatment time is 10-30 minutes, and the temperature is 300-600°C;

[0045] The protective gas is selected from at least one of nitrogen, helium, argon and xenon;

[0046] The thickness of the amorphous silicon deposition layer is 0.5-5 nm.

[0047] The third object of the present invention is to provide an electrical appliance, including an iron-based amorphous nanocrystalline magnetic core for the electrical appliance, and the electrical appliance includes a switch power supply, an inverter power supply, a display power supply, a broadband transformer, an AC transformer, a high-power output transformer, a resonant transformer, an output inductor, a compensation inductor, a memory, an engine control system, and a bearingless motor.

[0048] The above technical solution of the present invention has the following advantages compared with the prior art:

[0049] 1. Two amorphous nanocrystalline alloy strips Fe a B b Si c X d Align, fit and extrude to obtain the upper and lower double layers of amorphous nanocrystalline alloy ribbon Fe a B b Si c X d , to prevent the single-layer amorphous nanocrystalline alloy with Fe a B b Si c X d Under external tension or alloy shaping, the amorphous nanocrystalline alloy with Fe a B b Si c X d Free slip, cracking of alloy bands, etc., improve the grain boundary deformation ability of the single-layer amorphous nanocrystalline alloy, thereby improving the toughness under external force.

[0050] 2. In the upper and lower double layers of amorphous nanocrystalline alloy with Fe a B b Si c X d On the basis of the gradient spraying ≥ 2 layers of amorphous alloy gradient coating layer Fe e B f Si g Y h , forming a multi-layer coating layer with reduced Y source (chromium, niobium, zirconium, titanium metal) content, on the one hand, reducing the proportion of chromium, niobium, zirconium, and titanium metals, reducing costs; on the other hand, the multi-layer coating layer can prevent partial shedding or cracking of a single coating layer, resulting in the exposed internal iron-containing matrix alloy composite components, further erosion, thereby enhancing local corrosion resistance and ensuring the stability and normal magnetic properties of the iron-based amorphous nanocrystalline magnetic core.

[0051] 3. Form a silicon deposition layer by low-temperature vapor deposition, and then oxidize it to obtain a silicon dioxide layer. a B b Si c X d -Fe a B b Sic X d @Fe e B f Si g Y h1 @Fe e B f Si g Y h2 @Fe e B f Si g Y h3 @...@Fe e B f Si g Y hn A homogeneous thin silicon dioxide layer is formed on the surface, which improves the corrosion resistance of the outermost surface. In addition, stress is generated during the preparation process, and the heat generated by the thermal stabilization (oxidation) treatment releases these stresses, resulting in improved magnetic properties and increased magnetic permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0053] Figure 1 is a cross-sectional schematic diagram of embodiment 1 of the present invention;

[0054] Figure 2 is a cross-sectional schematic diagram of Example 7 of the present invention;

[0055] Figure 3 The XRD diffraction patterns obtained in Comparative Example 1 and Example 1 of the present invention are all amorphous alloys;

[0056] Figure 4 Graphs 1 and 2 are the passivation conditions of the amorphous strips of the embodiments and comparative examples.

[0057] Numbering in the attached figure: 1 is the lower layer of amorphous nanocrystalline alloy Fe a B b Si c X d ; 2 is the upper layer Fe a B b Si c X d Alloy strip; 3-1 is the first amorphous alloy coating layer Fe e B f Si g Y h1 ; 3-2 is the second amorphous alloy coating layer Fe e B f Si g Yh2 ; 3-3 is the third amorphous alloy coating layer Fe e B f Si g Y h2 ; 4 is a silicon dioxide passivation layer. DETAILED DESCRIPTION

[0058] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0059] Example 1

[0060] 1. A method for preparing an iron-based amorphous nanocrystalline magnetic core, comprising the following steps:

[0061] (1) Alloy smelting: iron source (iron ingot with iron content ≥99.999%), boron source (single crystal boron with boron content ≥99.999%), silicon source (8:2 ferrosilicon, iron-silicon alloy with purity >99.99%), X source (X source includes nickel and copper; among them, nickel sheet with nickel content ≥99.999%, copper sheet with copper content ≥99.999%) are weighed, and the atomic mole numbers of Fe, B, Si, Ni, and Cu are 0.82, 0.06, 0.07, 0.02, and 0.03, respectively. Argon is filled into a high-temperature electric heating furnace and the above raw materials are sent to the high-temperature electric heating furnace for mixing to obtain iron-boron-silicon-nickel-copper (Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 )alloy.

[0062] (2) Spraying to form alloy strip: evacuate to a vacuum degree of <3 Pa, fill with argon gas, and use an electric induction furnace (Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 ) alloy was heated and melted, and the spray valve was pressed at a pressure of 0.05MPa to spray the molten iron-boron-silicon alloy ingot with vacuum atomization at 0.75MPa onto a copper roller at 5000 rpm, and the amorphous nanocrystalline alloy strip (Fe) with a width of 6mm and a thickness of 1.4mm was obtained by cutting. 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 ), two amorphous nanocrystalline alloy ribbons of the same width (Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu0.03 ) were aligned and bonded at 0.63 GPa, and after 30 minutes, they were fully pressed and contacted to obtain the upper and lower double-layer amorphous alloy ribbons (Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 ), that is, a double-layer amorphous alloy ribbon Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 .

[0063] (3) Perform secondary spraying to form Fe containing Y source (niobium, zirconium) gradient e B f Si g Y h Amorphous alloy coating layer: iron source (iron ingot with iron content ≥99.999%), boron source (single crystal boron with boron content ≥99.999%), silicon source (ferrosilicon with a molar ratio of 8:2, iron-silicon alloy with purity >99.99%) and Y source (wherein the Y source is niobium-zirconium alloy with a molar ratio of niobium-zirconium of 2:1 and purity >99.99%) are weighed for the first time (according to the atomic molar numbers of Fe, B, Si, Nb and Zr converted to 0.65, 0.06, 0.08, 0.15 and 0.06 respectively), filled with argon gas at a vacuum degree of <3Pa, and heated at 1480°C for 25min to obtain the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.15 Zr 0.06 , the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.15 Zr 0.06 The amorphous alloy strip Fe obtained in step (1) is heated and melted in an argon atmosphere, and vacuum atomized and sprayed at 0.75 MPa. 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 surface, where the first alloy Fe 0.65 B 0.06 Si0.08 Nb 0.16 Zr 0.05 The mass of Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 0.12wt% of Fe forming the first amorphous alloy coating layer 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.15 Zr 0.06 ;

[0064] (4) The iron source (iron ingot with an iron content of ≥99.999%), the boron source (single crystal boron with a boron content of ≥99.999%), the silicon source (8:2 ferrosilicon, an iron-silicon alloy with a purity of >99.99%) and the Y source (3:1 niobium-titanium, a niobium-titanium alloy with a purity of >99.99%) were weighed for a second time (according to the atomic molar numbers of Fe, B, Si, Nb, and Ti converted to 0.68, 0.06, 0.08, 0.12, and 0.06, respectively), and then heated at 1480°C for 25 min in an argon atmosphere at a vacuum degree of <3 Pa to obtain the second alloy Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06 , vacuum atomization spraying at 0.75MPa to the amorphous alloy strip Fe obtained in step (3) 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.15 Zr 0.06 surface, where the second alloy Fe0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06 Account for Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 0.09wt% of Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06 , which is Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.16 Zr 0.05 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06 ;

[0065] (5) Depositing amorphous silicon (forming a silicon deposition layer), oxidizing it to form silicon dioxide (forming a silicon dioxide passivation layer), and obtaining an iron-based amorphous nanocrystalline alloy strip: 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.16 Zr 0.05 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06The alloy strip was sent to a fluidized bed at a high temperature of 455°C. A gaseous silicon source (0.5t% by volume of monosilane) was used in an argon atmosphere to uniformly deposit 3nm thick amorphous silicon on the alloy surface to form a silicon deposition layer. Then, a thermal stabilization (oxidation) treatment was performed in an oxygen-containing argon atmosphere (the volume ratio of oxygen to argon was 1:3) for 15 minutes at a temperature of 430°C. A 3nm silicon dioxide passivation layer was formed on the surface. The structure of the iron-based amorphous nanocrystalline alloy strip was Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.16 Zr 0.05 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06 @SiO2;

[0066] (6) Preparation of magnetic core: Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.16 Zr 0.05 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Zr 0.06 @SiO2 is sent into a ring-shaped mold and wound to obtain a ring-shaped iron-based amorphous nanocrystalline magnetic core with an inner diameter of 6.5mm and a thickness of 2.75mm.

[0067] Example 2

[0068] The difference from Example 1 is:

[0069] In step (1): the X source is a cobalt sheet with a cobalt content of ≥99.999%, an aluminum with an aluminum content of ≥99.999%, and the atomic molar numbers of Fe, B, Si, Co, and Al are 0.85, 0.04, 0.06, 0.02, and 0.03, respectively.

[0070] Example 3

[0071] The difference from Example 1 is:

[0072] In step (3): the Y source is selected from a chromium-titanium alloy, which is heated and smelted to obtain a first alloy Fe 0.64 B 0.06 Si 0.08 Cr 0.15 Ti 0.07 、The second alloy Fe 0.70 B 0.06 Si 0.08 Cr 0.10 Ti 0.06 , vacuum atomized and sprayed onto the surface of the amorphous alloy strip at 0.8 MPa, accounting for Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 0.15wt%, 0.07wt%, Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Cu 0.03 @Fe 0.64 B 0.06 Si 0.08 Cr 0.15 Ti 0.07 @Fe 0.70 B 0.06 Si 0.08 Cr 0.10 Ti 0.06 .

[0073] Example 4

[0074] 1. Preparation method of iron-based amorphous nanocrystalline magnetic core:

[0075] (1) Alloy smelting: The iron source (iron ingot with an iron content of ≥99.999%), the boron source (single crystal boron with a boron content of ≥99.999%), the silicon source (8:2 ferrosilicon, iron-silicon alloy with a purity of >99.99%), and the X source (the X source includes nickel and aluminum, wherein the nickel sheet with a nickel content of ≥99.999% and the aluminum sheet with an aluminum content of ≥99.999%) are weighed, and the atomic molar numbers of Fe, B, Si, Ni, and Al are 0.82, 0.06, 0.06, 0.03, and 0.03, respectively. The high-temperature electric furnace is filled with argon gas and the above raw materials are sent to the high-temperature electric furnace for mixing. The raw materials are heated at 1650°C for 10 min to obtain iron-boron-silicon-nickel-aluminum (Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 )alloy.

[0076] (2) Spraying to form alloy strip: evacuate to a vacuum degree of <3 Pa, fill with argon, and use an electric induction furnace (Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 ) alloy was heated and smelted, and the spray valve was pressed at a pressure of 0.05MPa to spray the molten iron-boron-silicon alloy ingot with vacuum atomization at 0.75MPa onto a copper roller at 5000 rpm, and the nanocrystalline alloy strip (Fe) with a width of 5mm and a thickness of 1.2mm was obtained by cutting. 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 ), two amorphous nanocrystals of the same width (Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 ) alloy strips were aligned and bonded at 0.83 GPa. After 30 min, they were fully pressed and contacted to obtain the upper and lower double-layer amorphous alloy strips (Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 ), that is, a double-layer amorphous alloy ribbon Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 .

[0077] (3) Perform multiple spraying to form Fe containing Y source (niobium, titanium) gradient e B f Si g Y h Amorphous alloy coating layer: iron source (iron ingot with iron content ≥99.999%), boron source (single crystal boron with boron content ≥99.999%), silicon source (ferrosilicon with a molar ratio of 8:2, iron-silicon alloy with a purity of >99.99%) and Y source (wherein the Y source is niobium-titanium alloy with a molar ratio of niobium-titanium of 2:1 and a niobium-titanium alloy with a purity of >99.99%) are weighed for the first time (according to the atomic molar numbers of Fe, B, Si, Nb, and Ti converted to 0.65, 0.06, 0.08, 0.14, and 0.07, respectively), filled with argon gas at a vacuum degree of <3Pa, and heated at 1700°C for 10min to obtain the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 , the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 The amorphous alloy strip Fe obtained in step (1) is heated and melted in an argon atmosphere, and vacuum atomized and sprayed at 0.75 MPa. 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 surface, wherein the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 The mass of Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 0.13wt% of Fe forming the first amorphous alloy coating layer 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B0.06 Si 0.06 Ni 0.03 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 ;

[0078] (4) The iron source (iron ingot with an iron content of ≥99.999%), the boron source (single crystal boron with a boron content of ≥99.999%), the silicon source (8:2 ferrosilicon, an iron-silicon alloy with a purity of >99.99%) and the Y source (3:1 niobium-titanium with a molar ratio of 3:1, a niobium-titanium alloy with a purity of >99.99%) were weighed for the second time (according to the atomic molar numbers of Fe, B, Si, Nb, and Ti converted to 0.68, 0.06, 0.08, 0.12, and 0.06, respectively), and the vacuum degree was <3 Pa. The second alloy Fe was melted at 1700°C for 10 min in an argon atmosphere. 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 , vacuum atomization spraying at 0.75MPa to the amorphous nanocrystalline alloy band Fe obtained in step (3) 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 Surface, second alloy Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 The mass of Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 0.09wt% of Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti0.06 , which is Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 ;

[0079] (5) depositing amorphous silicon (forming a silicon deposition layer), oxidizing it to form silicon dioxide (forming a silicon dioxide passivation layer), and obtaining an iron-based amorphous nanocrystalline alloy strip: 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 At a high temperature of 450°C, it is sent to a fluidized bed, and in an argon atmosphere, a gaseous silicon source (0.5% volume fraction of monosilane) is used to uniformly deposit 3nm thick amorphous silicon on the alloy surface to form a silicon deposition layer, and then a heat stabilization (oxidation) treatment is carried out in an atmosphere of oxygen-argon mixed gas (the volume ratio of oxygen and argon is 1:3) for 15 minutes at a temperature of 410°C, and a 3nm silicon dioxide passivation layer is formed on the surface. The structure formula of the iron-based amorphous nanocrystalline alloy strip is Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 @SiO2;

[0080] (6) Preparation of magnetic core: Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 @SiO2 is sent into a ring-shaped mold and wound to obtain a ring-shaped iron-based amorphous nanocrystalline magnetic core with an inner diameter of 6.5mm and a thickness of 2.4mm.

[0081] Example 5

[0082] The difference from Example 4 is that:

[0083] In step (1): the X source is a cobalt sheet with a cobalt content of ≥99.999%, an aluminum sheet with an aluminum content of ≥99.999%, and the atomic molar numbers of Fe, B, Si, Co, and Al are 0.82, 0.06, 0.07, 0.01, and 0.04, respectively.

[0084] Example 6

[0085] The difference from Example 4 is that:

[0086] In step (3): the Y source is selected from a chromium-titanium alloy, which is heated and smelted to obtain a first alloy Fe 0.64 B 0.06 Si 0.08 Cr 0.16 Ti 0.06 、The second alloy Fe 0.70 B 0.06 Si 0.08 Cr 0.10 Ti 0.06, and then vacuum atomized and sprayed onto the surface of the amorphous and nanocrystalline alloy strips at 0.8 MPa, accounting for Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 0.10wt%, 0.08wt%, Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 -Fe 0.82 B 0.06 Si 0.06 Ni 0.03 Al 0.03 @Fe 0.64 B 0.06 Si 0.08 Cr 0.16 Ti 0.06 @Fe 0.70 B 0.06 Si 0.08 Cr 0.10 Ti 0.06 .

[0087] Example 7

[0088] 1. Preparation method of iron-based amorphous nanocrystalline magnetic core:

[0089] (1) Alloy smelting: The iron source (iron ingot with an iron content of ≥99.999%), the boron source (single crystal boron with a boron content of ≥99.999%), the silicon source (ferrosilicon with a molar ratio of 8:2, iron-silicon alloy with a purity of >99.99%), and the X source (the X source includes nickel and aluminum, wherein the nickel content is ≥99.999% nickel sheet, and the aluminum content is ≥99.999% aluminum sheet) are weighed, and the atomic molar numbers of Fe, B, Si, Ni, and Al are 0.82, 0.06, 0.07, 0.02, and 0.03, respectively, and the high-temperature electric furnace is filled with argon gas, and the mixture is mixed and smelted to obtain iron-boron-silicon-nickel-aluminum (Fe)-containing. 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 )alloy.

[0090] (2) Spraying to form alloy strip: evacuate to a vacuum degree of <3 Pa, fill with argon, and use an electric induction furnace (Fe 0.82 B 0.06 Si 0.07 Ni0.02 Al 0.03 ) alloy was heated and melted, and the spray valve was pressed at a pressure of 0.05MPa to spray the molten iron-boron-silicon alloy ingot with vacuum atomization at 0.75MPa onto a copper roller at 5000 rpm, and the amorphous nanocrystalline alloy strip (Fe) with a width of 6mm and a thickness of 1.2mm was obtained by cutting. 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 ), two amorphous nanocrystalline alloy ribbons of the same width (Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 ) were aligned and bonded at 0.63 GPa, and after 30 min, they were fully pressed and contacted to obtain the upper and lower double-layer amorphous nanocrystalline alloy ribbons (Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 ), that is, a double-layer amorphous nanocrystalline alloy with Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 .

[0091] (3) Perform multiple spraying to form Fe containing Y source (niobium, titanium) gradient e B f Si g Y h Amorphous alloy coating layer: iron source (iron ingot with iron content ≥99.999%), boron source (single crystal boron with boron content ≥99.999%), silicon source (ferrosilicon with a molar ratio of 8:2, iron-silicon alloy with a purity of >99.99%) and Y source (wherein the Y source is niobium-titanium alloy with a molar ratio of niobium-titanium of 2:1 and a niobium-titanium alloy with a purity of >99.99%) are weighed for the first time (according to the atomic molar numbers of Fe, B, Si, Nb, and Ti converted to 0.65, 0.06, 0.08, 0.14, and 0.07, respectively), filled with argon gas at a vacuum degree of <3Pa, and heated at 1650°C for 12min to obtain the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 , the first alloy Fe 0.65 B0.06 Si 0.08 Nb 0.14 Ti 0.07 The amorphous alloy strip Fe obtained in step (1) is heated and melted in an argon atmosphere, and vacuum atomized and sprayed at 0.75 MPa. 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 surface, where the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 The mass of Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 0.18wt% of Fe forming the first amorphous alloy coating layer 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 ;

[0092] (4) The iron source (iron ingot with an iron content of ≥99.999%), the boron source (single crystal boron with a boron content of ≥99.999%), the silicon source (ferrosilicon with a molar ratio of 8:2, an iron-silicon alloy with a purity of >99.99%) and the Y source (niobium-titanium with a molar ratio of 3:1, a niobium-titanium alloy with a purity of >99.99%) were weighed for the second time (according to the atomic molar numbers of Fe, B, Si, Nb, and Ti converted to 0.68, 0.06, 0.08, 0.12, and 0.06, respectively), and the vacuum degree was <3 Pa, and the second alloy Fe was obtained by heating and melting in an argon atmosphere. 0.68 B 0.06 Si 0.08 Nb 0.12 Ti0.06 , vacuum atomization spraying at 0.75MPa to the amorphous nanocrystalline alloy band Fe obtained in step (3) 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 surface, wherein the second alloy Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 The mass of Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 0.12wt% of Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 , which is Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 ;

[0093] (5) The iron source (iron ingot with an iron content of ≥99.999%), the boron source (single crystal boron with a boron content of ≥99.999%), the silicon source (8:2 ferrosilicon, an iron-silicon alloy with a purity of >99.99%) and the Y source (3:1 niobium-titanium, a niobium-titanium alloy with a purity of >99.99%) were weighed for the third time (the atomic molar numbers of Fe, B, Si, Nb and Ti were converted to 0.70, 0.07, 0.08, 0.10 and 0.05, respectively), and the third alloy Fe was obtained by heating at 1550°C for 15 min in an argon atmosphere at a vacuum of <3 Pa. 0.70 B 0.07 Si 0.08 Nb 0.10 Ti 0.05 , vacuum atomization spraying at 0.75MPa onto the surface of the amorphous nanocrystalline alloy strip Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 , forming the third amorphous alloy coating layer Fe 0.70 B 0.07 Si 0.08 Nb 0.10 Ti 0.05 , among which the third alloy Fe 0.70 B 0.07 Si 0.08 Nb 0.10 Ti 0.05 The mass of Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 0.07wt%, that is, Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03-Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 @Fe 0.70 B 0.07 Si 0.08 Nb 0.10 Ti 0.05 ;

[0094] (4) Depositing amorphous silicon (forming a silicon deposition layer), and oxidizing it to form silicon dioxide (forming a silicon dioxide passivation layer), to obtain an iron-based amorphous nanocrystalline alloy strip: The alloy strip is sent to a fluidized bed at a high temperature of 455°C, and in an argon atmosphere, a gaseous silicon source (0.5% volume fraction of monosilane) is used to uniformly deposit 3 nm thick amorphous silicon on the alloy surface to form a silicon deposition layer, and then heat stabilization (oxidation) treatment is carried out in an oxygen-containing argon atmosphere (the volume ratio of oxygen to argon is 4:1) for 20 minutes at a temperature of 420°C, and a 4 nm silicon dioxide passivation layer is formed on the surface, to obtain an iron-based amorphous nanocrystalline alloy strip with a structural formula of Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 @Fe 0.70 B 0.07 Si 0.08 Nb 0.10 Ti 0.05 -SiO2;

[0095] (5) Preparation of magnetic core: Fe 0.82 B 0.06 Si 0.07 Ni0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.14 Ti 0.07 @Fe 0.68 B 0.06 Si 0.08 Nb 0.12 Ti 0.06 @Fe 0.70 B 0.07 Si 0.08 Nb 0.10 Ti 0.05 @SiO2 is sent into a ring-shaped mold and wound to obtain a ring-shaped iron-based amorphous nanocrystalline magnetic core with an inner diameter of 6.5mm and a thickness of 2.3mm.

[0096] Example 8

[0097] The difference from Example 7 is that:

[0098] In step (3): the Y source is a zirconium-titanium alloy, which is heated and smelted to obtain a first alloy Fe 0.64 B 0.06 Si 0.08 Zr 0.16 Ti 0.06 、The second alloy Fe 0.70 B 0.06 Si 0.08 Zr 0.10 Ti 0.06 、The third alloy Fe 0.72 B 0.06 Si 0.08 Zr 0.08 Ti 0.06 , and then vacuum atomized and sprayed onto the surface of the amorphous and nanocrystalline alloy strip at 0.76 MPa, accounting for Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 0.09wt%, 0.07wt%, 0.05wt% to obtain Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 @Fe 0.64 B 0.06 Si 0.08 Zr 0.16 Ti 0.06 @Fe 0.70 B 0.06 Si 0.08 Zr 0.10 Ti 0.06 @Fe 0.72 B 0.06 Si 0.08 Zr 0.08 Ti 0.06 .

[0099] Example 9

[0100] The difference from Example 7 is that:

[0101] In step (3): the Y source is selected from a chromium-titanium alloy, which is heated and smelted to obtain a first alloy Fe 0.64 B 0.06 Si 0.08 Cr 0.16 Ti 0.06 、The second alloy Fe 0.70 B 0.06 Si 0.08 Cr 0.10 Ti 0.06 、The third alloy Fe 0.72 B 0.06 Si 0.08 Cr 0.08 Ti 0.06 , and then vacuum atomized and sprayed onto the surface of the amorphous and nanocrystalline alloy strips at 0.8 MPa, accounting for Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 0.17wt%, 0.11wt%, 0.06wt% to obtain Fe 0.82 B 0.06 Si 0.07 Ni 0.02 Al 0.03 -Fe 0.82 B 0.06 Si 0.07 Ni0.02 Al 0.03 @Fe 0.64 B 0.06 Si 0.08 Cr 0.16 Ti 0.06 @Fe 0.70 B 0.06 Si 0.08 Cr 0.10 Ti 0.06 @Fe 0.72 B 0.06 Si 0.08 Cr 0.08 Ti 0.06 .

[0102] Comparative Example 1

[0103] The difference from Example 1 is:

[0104] Step (2) does not produce a double layer of amorphous nanocrystalline alloy strips (Fe 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 ), is just a single layer of amorphous nanocrystalline alloy ribbon (Fe 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 ).

[0105] Comparative Example 2

[0106] The difference from Example 1 is:

[0107] Step (3) is sprayed only once to form a Fe-containing Y source (niobium, zirconium) gradient e B f Si g Y h Amorphous alloy coating layer: iron source (iron ingot with iron content ≥99.999%), boron source (single crystal boron with boron content ≥99.999%), silicon source (8:2 ferrosilicon, iron silicon alloy with purity >99.99%) and Y source (2:1 niobium zirconium, niobium zirconium alloy with purity >99.99%) are weighed for the first time (according to the atomic molar number of Fe, B, Si, Nb, Zr converted to 0.65, 0.06, 0.08, 0.15, 0.06 respectively), vacuum degree <3Pa, filled with argon, heated and smelted to obtain the first alloy Fe 0.65 B 0.06 Si 0.08 Nb 0.16 Zr 0.05 , the first alloy Fe 0.65 B 0.06Si 0.08 Nb 0.16 Zr 0.05 The alloy was heated and melted in an argon atmosphere and vacuum atomized and sprayed onto the amorphous nanocrystalline alloy strip Fe at 0.75 MPa. 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 -Fe 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 Surface, accounting for Fe 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 -Fe 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 0.12wt% of Fe forming the first amorphous alloy coating layer 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 -Fe 0.86 B 0.03 Si 0.06 Ni 0.02 Cu 0.03 @Fe 0.65 B 0.06 Si 0.08 Nb 0.16 Zr 0.05 .

[0108] Comparative Example 3

[0109] The difference from Example 7 is that:

[0110] Without step (4), amorphous silicon is not deposited (forming a silicon deposition layer), and oxidation is performed to form silicon dioxide.

[0111] test:

[0112] 1. Elongation test (the alloy's ability to plastic toughness, the greater the ductility, the better the plastic toughness):

[0113] Two strips of the iron-based amorphous nanocrystalline alloy strips of the above-mentioned embodiments and comparative examples before the step of preparing the magnetic core were cut (the average of the two calculated elongation data was taken), each strip was 30±2 mm long, and the tensile strength was tested. The actual length L1 of each iron-based amorphous nanocrystalline alloy strip was measured before the test, and the length was L2 when tested with a universal tensile testing machine. The elongation = (L2-L1) / L1.

[0114] Table 1

[0115]

[0116]

[0117] The elongation data of each group of embodiments and comparative examples ranges from 0.013 to 0.026. Comparative Example 1 is a single-layer amorphous nanocrystalline alloy belt. The single-layer has poor external force stretching or alloy shaping ability, which means that the double-layer amorphous nanocrystalline alloy belt design improves the toughness under external force by improving the grain boundary deformation ability of the single-layer amorphous nanocrystalline alloy.

[0118] 2. Corrosion resistance test

[0119] The corrosion resistance was tested on an electrochemical workstation. One strip of the iron-based amorphous nanocrystalline alloy strips of Example 1, Comparative Example 2 and Comparative Example 3 before the step of preparing the magnetic core was cut, each strip being 30±2 mm long. Before the test, a 2.0 wt% sodium chloride solution was selected as the corrosive medium. The iron-based amorphous nanocrystalline alloy strips of Example 1, Comparative Example 2 and Comparative Example 3 were placed in the sodium chloride solution and allowed to stand for 30 minutes. After being taken out, the alloy strip to be tested was used as the working electrode, the saturated calomel electrode was used as the reference electrode, and the Pt electrode was used as the auxiliary electrode. A scanning speed of 1.2 mV / S was selected to obtain the corresponding polarization curve. All tests were carried out at 25±2°C.

[0120] The experimental results are shown in Figure 4 : The amorphous strip in Comparative Example 3 has no obvious passivation platform, and the anodic polarization curves of the strips in Comparative Example 2 and Example 1 have a significantly wide passivation platform. However, the two layers of amorphous alloy gradient coating containing Y source (niobium and zirconium) designed in Example 1 significantly improve the corrosion potential of the strip and reduce the corrosion current density of the strip, indicating that the addition of the silicon dioxide layer and the amorphous alloy gradient coating layer improves the corrosion resistance of the iron-based amorphous nanocrystalline alloy.

[0121] 3. Magnetic permeability test

[0122] Test before corrosion: The magnetic cores prepared in the examples and comparative examples were tested using a dynamic magnetic performance BH tester, and the effective magnetic permeability of the magnetic cores was measured under the conditions of an external magnetic field strength of 0.1 mT and a frequency of 80 kHz.

[0123] Post-corrosion test: The magnetic cores prepared in the embodiment and comparative example were placed in an oven at 45°C and immersed in a 2.0wt% sodium chloride solution for 5 days. They were taken out uniformly and tested using a dynamic magnetic performance BH tester. The effective magnetic permeability of the magnetic cores was measured under the conditions of an external magnetic field strength of 0.1mT and a frequency of 80kHz.

[0124] Table 2

[0125]

[0126] Among the effective magnetic permeability data of the magnetic cores of each group of embodiments and comparative examples, the effective magnetic permeability of comparative example 3 before corrosion is the lowest, indicating that the heat generated by the thermal stabilization (oxidation) treatment releases these stresses and increases the magnetic permeability; in addition, compared with comparative example 3, the effective magnetic permeabilities of embodiments 1-9 after corrosion are all larger, indicating that the gradient spraying of ≥2 layers of amorphous alloy gradient coating layers enhances the local corrosion resistance and ensures that the magnetic properties of the iron-based amorphous nanocrystalline magnetic core are stable and normal.

[0127] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. An iron-based amorphous nanocrystalline magnetic core, characterized in that: The iron-based amorphous nanocrystalline magnetic core comprises a molecular formula of Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2 amorphous nanocrystalline alloy ribbon; Fe a B b Si c X d -Fe a B b Si c X d It is a double-layer amorphous alloy ribbon; The Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2 with Fe e B f Si g Y hn As the coating layer, the Fe e B f Si g Y hn The surface is coated with a silicon dioxide passivation layer; The X is selected from a metal element and / or a metal alloy, wherein the metal element is selected from at least one of nickel, manganese, carbon, molybdenum, cobalt, aluminum, and copper; the metal alloy is selected from two or more alloys of nickel, manganese, carbon, molybdenum, nickel, cobalt, aluminum, and copper; a, b, c, and d are atomic ratios, wherein a≥0.6, 0.01≤b+c≤0.4, d≤0.3, and a+b+c+d=1; The Y is selected from a single metal element containing chromium, niobium, zirconium, or titanium, or an alloy of two or more of chromium, niobium, zirconium, or titanium; e, f, g, and hn are atomic number ratios, e+f+g+hn=1, h1>h1>h2>h3>……>hn≥0.05, and n≥2.

2. The iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: Fe e B f Si g Y hn The mass proportion of each coating layer is Fe a B b Si c X d -Fe a B b Si c X d 0.05wt%-0.3wt%.

3. The iron-based amorphous nanocrystalline magnetic core according to claim 1, characterized in that: The thickness of the silicon dioxide passivation layer is 0.5-5 nm.

4. A method for preparing the iron-based amorphous nanocrystalline magnetic core according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. In an inert atmosphere, an iron source, a boron source, a silicon source and an X source are mixed and heated in a heating device to smelt to obtain an iron-boron-silicon X alloy; S2, melting the iron-boron-silicon X alloy in an inert atmosphere, and performing vacuum atomization spraying, spraying it onto a copper roller, and cutting to obtain an amorphous nanocrystalline alloy strip Fe a B b Si c X d ; Two amorphous nanocrystalline alloy strips of the same width Fe a B b Si c X d Align, fit and extrude to obtain a double layer of amorphous nanocrystalline alloy ribbon Fe a B b Si c X d -Fe a B b Si c X d ; S3-1, using iron source, boron source, silicon source and Y source, heating and melting to obtain the first alloy Fe e B f Si g Y h1 , e+f+g+h1=1; in an inert atmosphere, the first alloy is heated and melted, and vacuum atomized and sprayed onto the amorphous nanocrystalline alloy band Fe a B b Si c X d -Fe a B b Si c X d The surface is coated with a first amorphous alloy coating layer Fe e B f Si g Y h1 Amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d , namely Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 ; S3-2, using iron source, boron source, silicon source and Y source, heating and melting to obtain the first alloy Fe e B f Si g Y h12 , e+f+g+h2=1; in an inert atmosphere, the second alloy is heated and melted, and vacuum atomized and sprayed onto the amorphous nanocrystalline alloy band Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 The surface is coated with a second amorphous alloy coating layer Fe e B f Si g Y h2 Amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 , namely Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y h1 @Fe e B f Si g Y h2 ; S3-3, repeat step S3-2, gradually reduce the amount of Y source added, and obtain n layers of amorphous alloy gradient coating layer Fe e B f Si g Y hn , n≥2, that is, amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn ; S4, the amorphous nanocrystalline alloy strip Fe obtained in step S3-3 a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn , sent to the fluidized bed, in an inert atmosphere, a gaseous silicon source is used to form amorphous nanocrystalline alloy with Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn An amorphous silicon deposition layer is formed on the surface, and then a silicon dioxide passivation layer is formed on the surface of the silicon deposition layer after oxidation treatment in a protective gas containing oxygen, so that an amorphous nanocrystalline alloy strip Fe a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2; S5, the amorphous nanocrystalline alloy strip Fe obtained in step S4 a B b Si c X d -Fe a B b Si c X d @Fe e B f Si g Y hn @SiO2 is sent to a mold for winding to obtain magnetic cores of different shapes, and finally the iron-based amorphous nanocrystalline magnetic core is obtained.

5. The preparation method according to claim 3, characterized in that: In step S1, the iron source is selected from elemental iron or iron alloy; The boron source is selected from elemental boron and / or boron alloys; The silicon source is selected from silicon element and / or silicon alloy; The X source is selected from metal elements and / or metal alloys; The inert gas in the inert atmosphere is selected from at least one of nitrogen, helium, argon and xenon; The smelting temperature is 1300-2200° C. and the smelting time is 5-30 minutes.

6. The preparation method according to claim 3, characterized in that: In step S2, the rotation speed of the copper roller is 1000-10000 rpm; The vacuum atomization pressure is 0.4-1.5MPa; The two amorphous nanocrystalline alloy strips Fe a B b Si c X d Align and bond for 3-50 minutes at 0.2-1.0 GPa to ensure full contact.

7. The preparation method according to claim 3, characterized in that: In step S3-1 or S3-2, the iron source is selected from elemental iron or iron alloy; The boron source is selected from elemental boron and / or boron alloys; The silicon source is selected from silicon element and / or silicon alloy; The Y contains a single metal element of chromium, niobium, zirconium, or titanium, or an alloy of two or more of chromium, niobium, zirconium, or titanium.

8. The preparation method according to claim 3, characterized in that: In step S3-1 or S3-2, the heating and smelting temperature is 1300-2200°C and the time is 5-30 minutes; The inert gas in the inert atmosphere is selected from at least one of nitrogen, helium, argon and xenon; The vacuum atomization pressure is 0.4-1.5MPa.

9. The preparation method according to claim 3, characterized in that: In step S4, the gaseous silicon source is selected from monosilane and / or disilane; The temperature of silicon deposition is 300-550°C; The oxidation treatment time is 10-30 minutes, and the temperature is 300-600°C; The protective gas is selected from at least one of nitrogen, helium, argon and xenon; The thickness of the amorphous silicon deposition layer is 0.5-5 nm.

10. An electrical appliance, characterized in that: The invention comprises the iron-based amorphous nanocrystalline magnetic core for electrical appliances as described in claim 1, wherein the electrical appliances include switch power supplies, inverter power supplies, display power supplies, broadband transformers, AC transformers, high-power output transformers, resonant transformers, output inductors, compensation inductors, memories, engine control systems, and bearingless motors.

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