Preparation method of short-process nanocrystalline magnetism isolating material

Abstract

The invention belongs to the technical field of soft magnetic material processing, and particularly relates to a preparation method of a short-process nanocrystalline magnetic isolation material. The method comprises the following steps: adding an amorphous / nanocrystalline strip into a roll-to-roll film laminating machine, conveying the amorphous / nanocrystalline strip through a compression roller, performing single-sided adhesive film coating treatment, and arranging a linear laser heating device, an electromagnetic induction heating device or a Joule heat treatment device along the width direction of the strip on the other side, coated with the adhesive film, of the strip, linear dynamic crystallization annealing treatment is carried out in the strip conveying process; and the treated strip is subjected to multi-layer attachment and then subjected to magnetic crushing, or the treated strip is subjected to multi-layer attachment and die cutting after magnetic crushing, and the nanocrystalline magnetic isolation material is obtained. A local linear dynamic crystallization annealing treatment process is adopted to replace conventional overall static heat treatment, the controllability of the crystallization process can be improved, and the soft magnetic performance of the material is effectively improved. And the method can be conveniently combined with a film covering protection treatment process before magnetic crushing of the nanocrystalline strip, so that the preparation process flow is reduced, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soft magnetic material processing, and in particular relates to a method for preparing a short-process nanocrystalline magnetic isolation material. Background Art

[0002] Nanocrystalline magnetic insulation materials have a wide range of applications in wireless charging, new energy vehicles, communications, and electronic power fields due to their high magnetic permeability, high saturation magnetic induction intensity, good mechanical properties, and chemical stability.

[0003] At present, the preparation method of nanocrystalline magnetic insulation materials generally adopts amorphous / nanocrystalline strips, which are annealed, crystallized and stress-relieved, and then crushed and multi-layered. The annealing and crystallization treatment of nanocrystalline soft magnetic materials is a key step to achieve their excellent soft magnetic properties. Annealing and crystallization treatment can control the grain size and distribution, thereby optimizing the magnetic properties of the material. The existing annealing and crystallization treatment generally involves heating the nanocrystalline strip as a whole for annealing and crystallization. However, overall heating will lead to a decrease in the controllability of the material crystallization process, the crystallization heat cannot be effectively released, and the grains are more likely to be coarse, thereby deteriorating the soft magnetic properties of the material. In our previous patent CN113284690B, a special secondary annealing process was used to effectively reduce magnetic loss under high power conditions and improve wireless charging efficiency. However, the secondary annealing process increases the processing process flow and reduces production efficiency.

[0004] In addition, the existing annealing crystallization treatment and the coating protection before crushing are completed in separate processing flows, that is, the annealing crystallization treatment is completed first, and then the coating treatment is performed. The process is relatively cumbersome and will cause mechanical damage to the strip during the conversion process of different processing flows, thereby reducing production efficiency and product quality. Summary of the invention

[0005] In view of the shortcomings and deficiencies of the above prior art, the object of the present invention is to provide a method for preparing nanocrystalline magnetic isolation materials in a short process.

[0006] The purpose of the present invention is achieved through the following technical solutions: A method for preparing a short-process nanocrystalline magnetic isolation material comprises the following preparation steps: (1) The amorphous / nanocrystalline strip is added to a roll-to-roll laminating machine and conveyed through a pressure roller and coated on one side. At the same time, a linear laser heating device, an electromagnetic induction heating device or a Joule heat treatment device is arranged along the width direction of the strip on the other side of the strip coated with the film, and a linear dynamic crystallization annealing treatment is performed during the conveying process of the strip; (2) The strip material treated in step (1) is subjected to multi-layer lamination and then crushed into magnets, or the strip material is crushed into magnets and then subjected to multi-layer lamination and die-cutting to obtain a nanocrystalline magnetic isolation material.

[0007] Furthermore, the amorphous / nanocrystalline ribbon in step (1) is an amorphous / nanocrystalline ribbon with a thickness of 5-30 μm, a width of 10-200 mm, and a composition system of FeSiB, FeCuNbSiB, FeCuMoSiB, FeSiBPCu, FeSiBC or Fe(Co)SiBPC, which is a commonly used iron-based amorphous / nanocrystalline soft magnetic material in the art.

[0008] Furthermore, the conveying speed of the pressure roller in step (1) is 1-120 m / min.

[0009] Furthermore, the adhesive film in step (1) is an adhesive film with a PET, PE or PI substrate; the thickness of the adhesive film is 1.0~75μm.

[0010] Furthermore, in step (1), the process along the width direction of the strip refers to being parallel to the width direction of the strip or forming a certain angle with the width direction of the strip. Preferably, the process is parallel to the width direction of the strip, which can save space and improve processing efficiency.

[0011] Furthermore, the laser heating device in step (1) is a laser with a power of 50-2000 W. The high-energy laser beam emitted by the laser performs line scanning along the width direction of the strip, and the strip in the area where the laser beam flows out of the beam rapidly undergoes nanocrystallization and stress relief annealing.

[0012] Furthermore, the electromagnetic induction heating device in step (1) is a flat induction heating coil with a power of 50-10000 W. The strip in the induction heating coil area undergoes nanocrystallization and stress relief annealing rapidly.

[0013] Furthermore, the Joule heat treatment device in step (1) is a pair of carbon brush electrodes arranged on both sides of the strip in the width direction, and the carbon brush electrodes are supplied with a current of 1 to 200 A by a DC power supply. The area where the current flows completes the rapid nanocrystallization and stress relief annealing of the strip.

[0014] Furthermore, the multi-layer lamination in step (2) refers to lamination of 2 to 4 layers using a double-sided tape with a thickness of 1 to 5 μm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The preparation method of the present invention adopts local linear dynamic laser heating, electromagnetic induction heating or Joule heat treatment to replace the conventional overall static heat treatment, which can improve the controllability of the crystallization process (such as by controlling the movement speed, power and current, etc.), and can effectively reduce the crystallization heat release. The crystallization heat release can be released quickly, and the grain size is finer and the distribution is more uniform, thereby effectively improving the soft magnetic properties of the material.

[0016] (2) The local linear dynamic heat treatment process adopted in the present invention can be conveniently combined with the coating protection treatment process before the nanocrystalline strip is crushed, thereby reducing the preparation process flow and avoiding thermal damage to the protective film, effectively improving production efficiency and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front overall schematic diagram of a short-process nanocrystalline magnetic isolation material nanocrystallization and stress relief annealing treatment process in Example 1.

[0018] Figure 2 This is a partial bottom view of the nanocrystallization and stress relief annealing process of a short-process nanocrystalline magnetic isolation material in Example 1, along the laser direction and perpendicular to the strip plane. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto. Example 1

[0020] A method for preparing a short-process nanocrystalline magnetic isolation material comprises the following preparation steps: (1) A 18 μm thick, Fe 73.5 Cu1Nb3Si 15.5 The amorphous strip of B7 (at.%) is added to the roll-to-roll laminating machine and conveyed by the pressure roller and coated on one side. The conveying speed of the pressure roller is 6m / min. The film is a single-sided PET substrate bonding film with a thickness of 5μm or a double-sided PET substrate bonding film with a thickness of 3μm (the outermost layer is a single-sided PET substrate bonding film, and the middle layer is a double-sided PET substrate bonding film). At the same time, a linear laser heating device is set along the width direction of the strip on the other side of the strip coating. During the conveying process of the strip, a high-energy laser beam with a power of 1000W is synchronously turned on to perform a line scan along the width direction of the strip. The strip in the area where the laser beam flows out of the beam quickly undergoes nanocrystallization and stress relief annealing. The overall front view of the above-mentioned nanocrystallization and stress relief annealing process and the local bottom view perpendicular to the plane of the strip along the laser direction are shown as follows. Figure 1 and Figure 2 shown.

[0021] (2) The strip material treated in step (1) is subjected to three-layer lamination and then subjected to magnetic fragmentation treatment, and then die-cut to obtain a nanocrystalline magnetic isolation material. Example 2

[0022] A method for preparing a short-process nanocrystalline magnetic isolation material comprises the following preparation steps: (1) A 20 μm thick, Fe 81.8 Cu 0.8 Nb 1.4Si6B 10 An amorphous strip with a surface area of ​​1000 nm (at. %) is added into a roll-to-roll laminating machine and conveyed by a pressure roller and coated on one side with a film. The conveying speed of the pressure roller is 10 m / min. The film is a single-sided PET substrate bonding film with a thickness of 5 μm or a double-sided PET substrate bonding film with a thickness of 3 μm (the outermost layer is a single-sided PET substrate bonding film, and the middle layer is a double-sided PET substrate bonding film). At the same time, a flat induction heating coil is arranged along the width direction of the strip on the other side of the strip coated with the film. During the conveying process of the strip, an electromagnetic induction heating with an adjustable power of 1-3 kW is synchronously turned on, and the strip in the area of ​​the induction heating coil is rapidly nanocrystallized and stress-relieved annealed.

[0023] (2) The strip material treated in step (1) is subjected to three-layer lamination and then subjected to magnetic fragmentation treatment, and then die-cut to obtain a nanocrystalline magnetic isolation material. Example 3

[0024] A method for preparing a short-process nanocrystalline magnetic isolation material comprises the following preparation steps: (1) A 25 μm thick, Fe 75.5 Cu1Nb2Si 14 B 7.5 The amorphous strip with a density of (at. %) is added to the roll-to-roll laminating machine and conveyed by the pressure roller and coated on one side. The conveying speed of the pressure roller is 8m / min. The film is a single-sided PET substrate adhesive film with a thickness of 5μm or a double-sided PET substrate adhesive film with a thickness of 3μm (the outermost layer is a single-sided PET substrate adhesive film, and the middle layer is a double-sided PET substrate adhesive film). At the same time, a Joule heat treatment device is set along the width direction of the strip on the other side of the strip coating. The Joule heat treatment device is a pair of carbon brush electrodes set on both sides of the strip width direction. The carbon brush electrodes are output by a DC power supply with a current of 10A. The area where the current flows completes the rapid nanocrystallization and stress relief annealing of the strip.

[0025] (2) The strip material treated in step (1) is subjected to three-layer lamination and then subjected to magnetic fragmentation treatment, and then die-cut to obtain a nanocrystalline magnetic isolation material. Comparative Example 1

[0026] A method for preparing a nanocrystalline magnetic isolation material, compared with Example 1, adopts a process of first performing overall static annealing crystallization treatment in a 560° C. heating furnace for 3 hours, and then performing a roll-to-roll coating process. Comparative Example 2

[0027] A method for preparing a nanocrystalline magnetic isolation material, compared with Example 2, adopts a process of first performing overall static annealing crystallization treatment in a 560° C. heating furnace for 3 hours, and then performing a roll-to-roll coating process. Comparative Example 3

[0028] A method for preparing a nanocrystalline magnetic isolation material, compared with Example 3, adopts a process of first performing overall static annealing crystallization treatment in a 560° C. heating furnace for 3 hours and then performing a roll-to-roll coating process.

[0029] The performance of the nanocrystalline magnetic isolation materials obtained in the above embodiments and comparative examples was tested. The magnetic permeability after the magnetic fragmentation was μ'=1400 @128kHz. The results are shown in Table 1 below.

[0030] Table 1 Test sample Grain size (nm) Volume fraction of crystallized phase (%) Rs (mΩ) @128kHz Q@128kHz Example 1 11.2 71 1790 36.2 Comparative Example 1 13.6 72 1860 34.5 Example 2 12.3 74 2085 31.9 Comparative Example 2 16.4 75 2130 31.3 Example 3 11.9 72 2160 30.7 Comparative Example 3 15.7 73 2210 30.2 It can be seen from the results in Table 1 that, compared with the overall static annealing crystallization treatment in a conventional heating furnace, the linear dynamic heating annealing crystallization treatment of the present invention can significantly refine the grain size while effectively shortening the treatment process, and can effectively reduce the induction resistance (Rs) and improve the quality factor (Q), thereby improving the soft magnetic properties of the product.

[0031] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for preparing a short-process nanocrystalline magnetic isolation material, characterized in that: The method comprises the following preparation steps: (1) The amorphous / nanocrystalline strip is added to a roll-to-roll laminating machine and conveyed through a pressure roller and coated on one side. At the same time, a linear laser heating device, an electromagnetic induction heating device or a Joule heat treatment device is arranged along the width direction of the strip on the other side of the strip coated with the film, and a linear dynamic crystallization annealing treatment is performed during the conveying process of the strip; (2) The strip material treated in step (1) is subjected to multi-layer lamination and then crushed into magnets, or the strip material is crushed into magnets and then subjected to multi-layer lamination and die-cutting to obtain a nanocrystalline magnetic isolation material.

2. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The amorphous / nanocrystalline ribbon in step (1) has a thickness of 5-30 μm, a width of 10-200 mm, and a composition system of FeSiB, FeCuNbSiB, FeCuMoSiB, FeSiBPCu, FeSiBC or Fe(Co)SiBPC.

3. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The conveying speed of the pressing roller in step (1) is 1-120 m / min.

4. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The adhesive film in step (1) is an adhesive film with a PET, PE or PI substrate; the thickness of the adhesive film is 1.0~75μm.

5. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: In step (1), the step along the width direction of the strip refers to the step being parallel to the width direction of the strip or forming a certain angle with the width direction of the strip.

6. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The laser heating device in step (1) is a laser with a power of 50 to 2000 W. The high-energy laser beam emitted by the laser performs line scanning along the width direction of the strip, and the strip in the area where the laser beam flows out of the beam rapidly undergoes nanocrystallization and stress relief annealing.

7. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The electromagnetic induction heating device in step (1) is a flat induction heating coil with a power of 50-10000W; the strip in the area of ​​the induction heating coil undergoes rapid nanocrystallization and stress relief annealing.

8. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The Joule heat treatment device in step (1) is a pair of carbon brush electrodes arranged on both sides of the strip in the width direction, and the carbon brush electrodes are supplied with a current of 1 to 200A by a DC power supply; the area through which the current flows completes the rapid nanocrystallization and stress relief annealing of the strip.

9. The method for preparing a short-process nanocrystalline magnetic isolation material according to claim 1, characterized in that: The multi-layer lamination in step (2) refers to lamination of 2 to 4 layers using a double-sided tape with a thickness of 1 to 5 μm.

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