CN111816436B - Soft magnetic material and preparation method thereof - Google Patents
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Abstract
The invention provides a soft magnetic material and a preparation method thereof, wherein the method comprises the following steps: 1) coating a protective material on one surface of the soft magnetic material original belt, and curing to obtain the soft magnetic material original belt with the protective material on the surface; 2) carrying out heat treatment on the soft magnetic material original belt containing the protective material to obtain a soft magnetic belt material; 3) arranging insulating glue on the surface, which is not coated with the protective material, of the soft magnetic strip, and crushing to obtain a crushed soft magnetic strip; 4) and (3) bonding the broken soft magnetic strip materials into the required layers, and laminating to obtain the soft magnetic material. The preparation method of the soft magnetic material provided by the invention adopts a method of carrying out heat treatment after surface treatment, can effectively improve the toughness of the soft magnetic material, and solves the problems that the soft magnetic strip after heat treatment is easy to break and break in the process of jointing.
Description
Technical Field
The invention belongs to the technical field of magnetic materials, and relates to a soft magnetic material and a preparation method thereof.
Background
The iron-based nanocrystalline alloy is an amorphous material formed by taking iron as a main component and adding a small amount of Nb, Cu, Si and B elements to the alloy through a rapid solidification process, and the amorphous material can be subjected to heat treatment to obtain a microcrystalline or nanocrystalline material which has a nanometer-level diameter and is dispersedly distributed on an amorphous substrate.
The nanocrystalline material has excellent comprehensive magnetic properties: high saturation induction, high initial permeability, low Hc, low high frequency loss under high induction, resistivity of 80 [ mu ] omega/cm, higher than permalloy (50-60 [ mu ] omega/cm), and high Br (0.9) or low Br value (1000Gs) after longitudinal or transverse magnetic field treatment. The material with the best comprehensive performance in the current market has the following optimal frequency range: 20kHz-50 kHz. The method is widely applied to the fields of power supplies, transformers, wireless charging and the like.
The manufacturing process of the iron-based nanocrystalline alloy generally comprises the following steps: firstly, smelting a base material, then preparing an amorphous alloy thin strip with the thickness of about 15-35 microns by using a rapid solidification technology, and further processing the amorphous alloy thin strip into a nanocrystalline strip by winding and carrying out heat treatment.
The heat treatment process is critical to the iron-based nanocrystals regardless of strip composition, material size, shape. The traditional heat treatment method of the iron-based nanocrystalline generally comprises the steps of heating, raising temperature and preserving heat in the heat treatment process, then cooling to room temperature along with a furnace, and discharging. The magnetic property of the iron-based nanocrystalline material is improved after the heat treatment in the mode, but the material after the heat treatment is microcrystallized, so that the strip material is poor in toughness, crisp in texture, very easy to break and fracture, and greatly influenced by the following magnetic sheet bonding process, and meanwhile, the magnetic property of the material is still low, and the wide application of the iron-based nanocrystalline material is limited. Therefore, how to optimize the heat treatment process of the iron-based nanocrystalline material to obtain the iron-based nanocrystalline material with better performance and toughness becomes a hot spot of research of the people in the field.
CN109741913A discloses a composite magnetic core with adjustable magnetic properties and a preparation method thereof, wherein the preparation method comprises: (1) and (3) heat treatment: selecting a proper soft magnetic alloy strip or a combination of multiple strips according to the performance requirement of the magnetic core, and carrying out heat treatment on the soft magnetic alloy strip under the respective proper conditions; (2) attaching: completely attaching the double-sided adhesive tape to the soft magnetic alloy strip after heat treatment, if the composite soft magnetic material is designed as a multilayer strip, attaching the multilayer soft magnetic alloy strip together, and reserving a protective film of the double-sided adhesive tape on the outermost layer to prepare a strip-shaped composite soft magnetic material; (3) and (3) crushing and magnetic treatment: selecting a proper magnetic crushing die according to the performance requirement of the magnetic core, performing magnetic crushing treatment on the strip-shaped composite soft magnetic material prepared in the step (2), and processing the whole soft magnetic alloy strip into a structure with uniformly distributed fragments with specific sizes and shapes; (4) shearing: according to the requirements of the structure and the size of the magnetic core, cutting the composite soft magnetic material prepared in the step (3) into a strip-shaped material with a specific width or a composite sheet with a specific shape; (5) forming a magnetic core: winding the strip-shaped composite soft magnetic material cut in the step (4) into a magnetic core with a required size by using a magnetic core winding machine, or laminating the composite sheet cut in the step (4) into a magnetic core with a required size and structure; (6) protection treatment: and (3) according to the requirement of the use occasion of the magnetic core, putting the magnetic core prepared in the step (5) into a protective box, carrying out surface coating treatment, winding insulating paper or insulating cloth on the surface, and carrying out protection treatment.
However, the method still needs further improvement on the problems of poor toughness of the annealed strip, easy crushing and breaking and further reduction of eddy current loss.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the soft magnetic material and the preparation method thereof, and the preparation method of the soft magnetic material provided by the invention solves the problems of poor toughness and easy breakage and fracture of annealed strips, and simultaneously further reduces the eddy current loss.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing a soft magnetic material, the method comprising the steps of:
(1) coating a protective material on one surface of the soft magnetic material original belt, and curing to obtain the soft magnetic material original belt with the protective material on the surface;
(2) carrying out heat treatment on the soft magnetic material original belt with the surface containing the protective material in the step (1) to obtain a soft magnetic belt material;
(3) attaching insulating glue to the surface, which is not coated with the protective material, of the soft magnetic strip in the step (2), and crushing to obtain a crushed soft magnetic strip;
(4) and (4) bonding the broken soft magnetic strip material obtained in the step (3) into a required number of layers, and laminating to obtain the soft magnetic material.
According to the preparation method provided by the invention, the surface of the original soft magnetic material strip is coated with the high-temperature-resistant protective material, and the protective layer can be formed on the surface of the soft magnetic strip after solidification, so that the toughness of the soft magnetic material can be increased after heat treatment, and the material can not be easily broken or fractured during lamination.
In the invention, the crushing treatment in the step (3) is used for enabling the soft magnetic strip material to achieve the required magnetic permeability.
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the technical objects and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
As a preferable technical scheme of the invention, the soft magnetic material original belt in the step (1) is an amorphous original belt and/or a nanocrystalline original belt.
Preferably, the raw soft magnetic material strip in the step (1) is an iron-based raw soft magnetic material strip.
In a preferred embodiment of the present invention, the protective material in step (1) is a resin.
Preferably, the resin comprises silicone.
In the present invention, the silicone resin is preferably a material that is resistant to high temperatures of 580 ℃ or higher, is easily cured, and has high toughness after curing.
Preferably, the silicone resin is a silicone liquid resin, preferably a silicone liquid resin which is resistant to high temperature of above 580 ℃ and easy to cure.
Preferably, the protective material is applied in a thickness of 2 to 5 μm, for example 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm or 5 μm, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
In the invention, if the coating thickness of the protective material is too thick, the thickness of the finished product is too thick, so that the use is influenced; if the coating thickness of the protective material is too thin, coating becomes difficult, and the effect of enhancing toughness is not obtained.
As a preferred embodiment of the present invention, the temperature of the heat treatment in the step (2) is 540-550 ℃, for example 540 ℃, 541 ℃, 542 ℃, 543 ℃, 544 ℃, 545 ℃, 546 ℃, 547 ℃, 548 ℃, 549 ℃, or 550 ℃, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable.
Preferably, the heat treatment in step (2) is carried out for 80-120min, such as 80min, 85min, 90min, 95min, 100min, 105min, 110min, 115min or 120min, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the heating and cooling time of the heat treatment in step (2) is 9-11h, such as 9h, 9.2h, 9.4h, 9.6h, 9.8h, 10h, 10.2h, 10.4h, 10.6h, 10.8h or 11h, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
As a preferable embodiment of the present invention, the step (2) further comprises: before the heat treatment, the soft magnetic material raw belt with the surface containing the protective material in the step (1) is wound and split.
In the present invention, the soft magnetic strip can be wound into a magnetic core-like coil material of a desired length or weight by the winding method.
Preferably, the winding and winding divide the soft magnetic material raw tape having the surface containing the protective material in the step (1) into rolls having a mass of 1 to 2kg, for example, a mass of 1kg, 1.1kg, 1.2kg, 1.3kg, 1.4kg, 1.5kg, 1.6kg, 1.7kg, 1.8kg, 1.9kg, or 2kg, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable.
As a preferred embodiment of the present invention, the thickness of the insulating paste in step (3) is 2.5 to 5 μm, for example, 2.5 μm, 2.6 μm, 2.7 μm, 2.8 μm, 2.9 μm, 3 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 4 μm, 4.5 μm or 5 μm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
Preferably, the insulating glue comprises a double-sided tape. But not limited to double-sided tape, other adhesive materials that can function as an insulator, such as glue or pressure sensitive tape, can also be used in the present invention.
As a preferable technical scheme of the invention, the crushing treatment in the step (3) enables the soft magnetic strip to be crushed into cracks.
As a preferable embodiment of the present invention, the method for laminating the layers to a desired number in step (4) includes: and (3) taking the broken soft magnetic strip as a bottom layer, enabling one surface of the broken soft magnetic strip to face upwards, enabling the insulating tape to be a double-sided adhesive tape, stripping off an adhesive tape protective layer of the double-sided adhesive tape, using the single-layer step (3) on an adhesive layer of the double-sided adhesive tape, attaching one surface of the broken soft magnetic strip, which is coated with a protective material, to the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the soft magnetic strip reaches the required number of layers.
In the invention, during the lamination, the insulating glue can ensure that the insulation among the magnetic sheets is more thorough, and the manufactured magnetic sheet material has lower eddy current loss and higher quality factor.
Preferably, the number of layers required in step (4) is 3 to 5, such as 3, 4, or 5 layers, etc.
As a preferable embodiment of the present invention, the coating film in the step (4) includes: and adhering adhesive tapes on the upper surface and the lower surface of the adhered soft magnetic strip.
Preferably, the adhesive tape is a single-sided adhesive tape and/or a double-sided adhesive tape.
Preferably, step (4) further comprises die cutting the soft magnetic strip after film coating. In the invention, the soft magnetic strip is cut into the size required by a customer by using a die cutting mode.
As a further preferable technical scheme of the preparation method, the method comprises the following steps:
(1) coating a protective material with the thickness of 2-5 mu m on one surface of the soft magnetic material original belt, and curing to obtain the soft magnetic material original belt with the surface containing the protective material;
the soft magnetic material original belt is an amorphous original belt and/or a nanocrystalline original belt, and the soft magnetic material original belt is an iron-based soft magnetic material original belt; the protective material is silicone;
(2) winding and sub-winding the soft magnetic material original belt with the surface containing the protective material in the step (1) into a coil with the mass of 1-2kg, and carrying out heat treatment at 550 ℃ for 540-120 min, wherein the heat preservation time of the heat treatment is 80-120min, and the heating and cooling time of the heat treatment is 9-11h to obtain a soft magnetic strip;
(3) attaching a double-sided adhesive tape with the thickness of 2.5-3.5 microns to one side of the soft magnetic strip material which is not coated with the protective material in the step (2), and crushing to enable the soft magnetic strip material to be cracked to obtain a crushed soft magnetic strip material;
(4) and (3) taking the crushed soft magnetic strip as a bottom layer, enabling one side of the crushed soft magnetic strip to face upwards, stripping off an adhesive tape protective layer of the double-sided adhesive tape, using the single-layer step (3) on an adhesive layer of the double-sided adhesive tape, laminating one side of the crushed soft magnetic strip, which is coated with a protective material, with the adhesive layer of the double-sided adhesive tape, repeating the laminating operation until the soft magnetic strip reaches the required number of layers, adhering adhesive tapes on the upper surface and the lower surface of the laminated soft magnetic strip, and performing die cutting to obtain the soft magnetic material.
In a second aspect, the present invention provides a soft magnetic material prepared by the preparation method according to the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
the preparation method of the soft magnetic material provided by the invention adopts a method of carrying out heat treatment after surface treatment, can effectively improve the toughness of the soft magnetic material, and solves the problems that the soft magnetic strip after heat treatment is easy to break and break in the process of jointing. Meanwhile, as the surface of the soft magnetic strip is coated with the protective material, the insulating property between magnetic sheets can be enhanced after the multiple layers of magnetic sheets are attached, the eddy current loss of the nanocrystalline magnetic sheet is further reduced, the quality factor of the magnetic sheet is improved, and the heat generation of the wireless charging module is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a nanocrystalline strip obtained after single-layer lamination in the preparation method provided in example 1;
fig. 2 is a schematic structural diagram of a nanocrystalline strip obtained after multilayer lamination in the preparation method provided in example 1;
wherein, 1-protective material, 2-nanocrystalline and 3-insulating glue.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1
This example prepares a soft magnetic material as follows:
1) and (3) coating high-temperature-resistant silicon resin (organic silicon liquid resin which is high in temperature resistance of more than 580 ℃ and easy to cure) on one surface of the iron-based nanocrystalline original belt. Coating the nano-crystalline with the thickness of 3 μm, and forming a layer of resin film on the surface of the nano-crystalline after curing.
2) And (3) splitting: the nanocrystalline strip was wound into a 1.5 kg/lap.
3) And (3) heat treatment: and annealing the wound nanocrystalline strip at 545 ℃ for 100min, wherein the total temperature rise and fall time is 10 h.
4) Single-layer laminating: and attaching a layer of 3-micrometer double-sided adhesive tape to the surface of the resin-free film of the nanocrystalline tape.
The structure of the single-layer attached nanocrystalline strip obtained in the step is shown in fig. 1, and the single-layer attached nanocrystalline strip consists of a protective material 1 (silicone resin), a nanocrystalline 2 and an insulating adhesive 3 (double-sided adhesive tape) which are sequentially stacked.
5) Crushing: and (3) crushing the single-layer attached amorphous/nanocrystalline strip to enable the nanocrystalline to be uniformly broken into small unit cracks and achieve the required magnetic conductivity 600.
6) Multilayer laminating: and (3) bonding the single-layer nanocrystalline crushed in the step 5) into 4 layers. Taking the single-layer nanocrystalline crushed in the step 5) as a bottom layer, enabling one surface attached with a double-sided adhesive tape to face upwards, stripping off a tape PET protective layer of the double-sided adhesive tape, attaching one surface, coated with a protective material, of the single-layer nanocrystalline crushed in the step 5) to an adhesive layer of the double-sided adhesive tape on the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the number of layers of the nanocrystalline reaches the required number.
The structural schematic diagram of the multilayer-laminated nanocrystalline strip obtained in the step is shown in fig. 2, 4 single-layer-laminated nanocrystalline strips shown in fig. 1 are sequentially laminated with each other, and the protective material 1 and the insulating glue 3 of adjacent single-layer-laminated nanocrystalline strips are laminated with each other.
7) Film covering: and respectively sticking black single-sided adhesive and double-sided adhesive to the upper and lower surfaces of the nanocrystalline strip.
8) Die cutting: cutting the amorphous/nanocrystalline strip after film covering into the size by using a die cutting mode: 50.8 multiplied by 60.8mm, namely the soft magnetic material.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Example 2
This example prepares a soft magnetic material as follows:
1) high-temperature-resistant silicon resin (organic silicon liquid resin which is high in temperature resistance of more than 580 ℃ and easy to cure) is coated on the iron-based nanocrystalline raw belt. The coating thickness is 5 μm, and a layer of resin film is formed on the surface of the nanocrystal after curing.
2) And (3) splitting: the nanocrystalline strip was wound into a 1.5 kg/lap.
3) And (3) heat treatment: and (3) carrying out annealing treatment on the coiled nanocrystalline strip by using an annealing treatment die, wherein the annealing temperature is 545 ℃, the heat preservation time is 100min, and the total heating and cooling time is 10 h.
4) Single-layer laminating: and attaching a layer of 3-micrometer double-sided adhesive tape to the surface of the resin-free film of the nanocrystalline tape.
5) Crushing: and (3) crushing the single-layer attached amorphous/nanocrystalline strip to enable the nanocrystalline to be uniformly broken into small unit cracks and achieve the required magnetic conductivity 600.
6) Multilayer laminating: and (3) bonding the crushed single-layer nanocrystalline into 4 layers. Taking the single-layer nanocrystalline crushed in the step 5) as a bottom layer, enabling one surface attached with a double-sided adhesive tape to face upwards, stripping off a tape PET protective layer of the double-sided adhesive tape, attaching one surface, coated with a protective material, of the single-layer nanocrystalline crushed in the step 5) to an adhesive layer of the double-sided adhesive tape on the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the number of layers of the nanocrystalline reaches the required number.
7) Film covering: and respectively sticking black single-sided adhesive and double-sided adhesive to the upper and lower surfaces of the nanocrystalline strip.
8) Die cutting: cutting the amorphous/nanocrystalline strip after film covering into the size by using a die cutting mode: 50.8 multiplied by 60.8mm, namely the soft magnetic material.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Example 3
This example prepares a soft magnetic material as follows:
1) the iron-based nanocrystalline raw belt is coated with high-temperature-resistant silicon resin (organic silicon liquid resin which is resistant to high temperature of more than 580 ℃ and easy to cure). Coating the nano-crystalline with the thickness of 3 μm, and forming a layer of resin film on the surface of the nano-crystalline after curing.
2) And (3) splitting: the nanocrystalline strip was wound into a 1.5 kg/lap.
3) And (3) heat treatment: and (3) carrying out annealing treatment on the coiled nanocrystalline strip by using an annealing treatment die, wherein the annealing temperature is 545 ℃, the heat preservation time is 100min, and the total heating and cooling time is 10 h.
4) Single-layer laminating: and attaching a layer of 5-micron double-sided adhesive tape to the surface of the resin-free film of the nanocrystalline strip.
5) Crushing: and (3) crushing the single-layer attached amorphous/nanocrystalline strip to enable the nanocrystalline to be uniformly broken into small unit cracks and achieve the required magnetic conductivity 600.
6) Multilayer laminating: and (3) bonding the crushed single-layer nanocrystalline into 4 layers. Taking the single-layer nanocrystalline crushed in the step 5) as a bottom layer, enabling one surface attached with a double-sided adhesive tape to face upwards, stripping off a tape PET protective layer of the double-sided adhesive tape, attaching one surface, coated with a protective material, of the single-layer nanocrystalline crushed in the step 5) to an adhesive layer of the double-sided adhesive tape on the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the number of layers of the nanocrystalline reaches the required number.
7) Film covering: and respectively sticking black single-sided adhesive and double-sided adhesive to the upper and lower surfaces of the nanocrystalline strip.
8) Die cutting: cutting the amorphous/nanocrystalline strip after film covering into the size by using a die cutting mode: 50.8 multiplied by 60.8mm, namely the soft magnetic material.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Example 4
This example prepares a soft magnetic material as follows:
1) the iron-based nanocrystalline raw belt is coated with high-temperature-resistant silicon resin (organic silicon liquid resin which is resistant to high temperature of more than 580 ℃ and easy to cure). Coating the nano-crystalline material to a thickness of 2 μm, and curing to form a resin film on the surface of the nano-crystalline material.
2) And (3) splitting: the nanocrystalline strip was wound into a 1.5 kg/lap.
3) And (3) heat treatment: and (3) annealing the coiled nanocrystalline strip at 540 ℃ for 120min, wherein the total temperature rise and fall time is 9 h.
4) Single-layer laminating: and attaching a layer of 5-micron double-sided adhesive tape to the surface of the resin-free film of the nanocrystalline strip.
5) Crushing: and (3) crushing the single-layer attached amorphous/nanocrystalline strip to enable the nanocrystalline to be uniformly broken into small unit cracks and achieve the required magnetic conductivity 600.
6) Multilayer laminating: and (3) bonding the crushed single-layer nanocrystalline into 3 layers. Taking the single-layer nanocrystalline crushed in the step 5) as a bottom layer, enabling one surface attached with a double-sided adhesive tape to face upwards, stripping off a tape PET protective layer of the double-sided adhesive tape, attaching one surface, coated with a protective material, of the single-layer nanocrystalline crushed in the step 5) to an adhesive layer of the double-sided adhesive tape on the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the number of layers of the nanocrystalline reaches the required number.
7) Film covering: and respectively sticking black single-sided adhesive and double-sided adhesive to the upper and lower surfaces of the nanocrystalline strip.
8) Die cutting: cutting the amorphous/nanocrystalline strip after film covering into the size by using a die cutting mode: 50.8 multiplied by 60.8mm, namely the soft magnetic material.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Example 5
This example prepares a soft magnetic material as follows:
1) the iron-based nanocrystalline raw belt is coated with high-temperature-resistant silicon resin (organic silicon liquid resin which is resistant to high temperature of more than 580 ℃ and easy to cure). The coating thickness is 5 μm, and a layer of resin film is formed on the surface of the nanocrystal after curing.
2) And (3) splitting: the nanocrystalline strip was wound into a 1.5 kg/lap.
3) And (3) heat treatment: and (3) annealing the coiled nanocrystalline strip at 550 ℃ for 80min, wherein the total temperature rise and fall time is 11 h.
4) Single-layer laminating: and attaching a layer of 2.5-micrometer double-sided adhesive tape to the surface of the resin-free film of the nanocrystalline tape.
5) Crushing: and (3) crushing the single-layer attached amorphous/nanocrystalline strip to enable the nanocrystalline to be uniformly broken into small unit cracks and achieve the required magnetic conductivity 600.
6) Multilayer laminating: and (3) bonding the crushed single-layer nanocrystalline into 5 layers. Taking the single-layer nanocrystalline crushed in the step 5) as a bottom layer, enabling one surface attached with a double-sided adhesive tape to face upwards, stripping off a tape PET protective layer of the double-sided adhesive tape, attaching one surface, coated with a protective material, of the single-layer nanocrystalline crushed in the step 5) to an adhesive layer of the double-sided adhesive tape on the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the number of layers of the nanocrystalline reaches the required number.
7) Film covering: and respectively sticking black single-sided adhesive and double-sided adhesive to the upper and lower surfaces of the nanocrystalline strip.
8) Die cutting: cutting the amorphous/nanocrystalline strip after film covering into the size by using a die cutting mode: 50.8 multiplied by 60.8mm, namely the soft magnetic material.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Example 6
The soft magnetic material preparation method of this example is different from example 1 in that the coating thickness of step 1) of this example is 1.5 μm.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Example 7
The soft magnetic material preparation method of this example is different from example 1 in that the coating thickness of step 1) of this example is 5.5 μm.
The test results of the soft magnetic material prepared in this example are shown in table 1.
Comparative example 1
The preparation method of the soft magnetic material provided by the comparative example is the same as that of the example 1 except that the operation of the step 1) is not performed, that is, the silicone resin is not coated, the step 4) is performed by directly attaching the double-sided adhesive tape to one surface of the nanocrystal, and the step 5) is performed by attaching the crushed single-layer nanocrystal on the adhesive layer of the double-sided adhesive tape to the surface which is not attached with the double-sided adhesive tape in the other step 5).
The test results of the soft magnetic material prepared in this comparative example are shown in table 1.
Test method
For the soft magnetic materials provided in the respective examples and comparative examples, an impedance analyzer of E4990A was used at the frequency: 128KHZ, voltage: testing the real part mu' of magnetic conductivity under the condition of 0.03V; the Q value and the RS value were measured under the condition of 128KHZ, 1V using LCR tester IM 3536. The time for the temperature rise test was 30 min. The test results are given in the following table:
TABLE 1
| μ＇ | RS | Q value | Temperature rise/. degree.C | |
| Example 1 | 610 | 636 | 13.05 | 38.6 |
| Example 2 | 601 | 631 | 13.10 | 38.3 |
| Example 3 | 620 | 633 | 13.06 | 38.5 |
| Example 4 | 612 | 638 | 13.08 | 38.6 |
| Example 5 | 608 | 633 | 13.06 | 38.4 |
| Example 6 | 622 | 640 | 12.95 | 39.2 |
| Example 7 | 615 | 628 | 13.11 | 38.4 |
| Comparative example 1 | 607 | 645 | 12.86 | 41.2 |
It can be known from the above examples and comparative examples that the thickness of the liquid silicone resin of the coating layer is increased by the surface treatment in examples 1 to 5, and the performance of the magnetic sheet is affected by the thickness of the adhesive layer, so that the direct current resistance of the magnetic sheet is reduced, the Q value is increased, and the temperature rise is obviously reduced. In addition, in the single-layer laminating process of the embodiment, the problems of easy crushing and breakage are obviously improved, the efficiency is greatly improved, and the reject ratio is obviously reduced.
The protective material of embodiment 6 has a low silicone coating thickness, a too thin coating difficulty is increased, a fracture exists in the attaching process, the toughness increasing effect is not well achieved, and compared with other examples in the aspect of performance, the Rs and the temperature rise are increased, and the Q value is reduced.
The protective material of example 7 had a higher silicone coating thickness, resulting in lower Rs, temperature rise and higher Q, but increased overall product thickness.
Comparative example 1 no protective silicone was applied to the surface of the nanocrystals.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (21)
1. A method for preparing a soft magnetic material, comprising the steps of:
(1) coating a protective material on one surface of the soft magnetic material original belt, and curing to obtain the soft magnetic material original belt with the protective material on the surface;
(2) carrying out heat treatment on the soft magnetic material original belt with the surface containing the protective material in the step (1) to obtain a soft magnetic belt material;
(3) arranging insulating glue on the surface, which is not coated with the protective material, of the soft magnetic strip in the step (2), and crushing to obtain a crushed soft magnetic strip;
(4) laminating the broken soft magnetic strip material obtained in the step (3) into a required number of layers, and laminating to obtain the soft magnetic material;
the method for laminating the required number of layers in the step (4) comprises the following steps: and (3) taking the broken soft magnetic strip as a bottom layer, enabling one surface of the broken soft magnetic strip to face upwards, enabling the insulating tape to be a double-sided adhesive tape, stripping off an adhesive tape protective layer of the double-sided adhesive tape, using the single-layer step (3) on an adhesive layer of the double-sided adhesive tape, attaching one surface of the broken soft magnetic strip, which is coated with a protective material, to the adhesive layer of the double-sided adhesive tape, and repeating the attaching operation until the soft magnetic strip reaches the required number of layers.
2. The production method according to claim 1, wherein the raw soft magnetic material ribbon of step (1) is an amorphous raw ribbon and/or a nanocrystalline raw ribbon.
3. The method according to claim 1, wherein the raw soft magnetic material ribbon of step (1) is an iron-based raw soft magnetic material ribbon.
4. The method according to claim 1, wherein the protective material of step (1) is a resin.
5. The method of claim 4, wherein the resin comprises silicone.
6. The production method according to claim 5, wherein the silicone resin is a silicone liquid resin.
7. The production method according to claim 1, wherein the coating thickness of the protective material is 2 to 5 μm.
8. The method as claimed in claim 1, wherein the temperature of the heat treatment in step (2) is 540-550 ℃.
9. The method according to claim 1, wherein the heat treatment of step (2) is carried out for a holding time of 80 to 120 min.
10. The preparation method of claim 1, wherein the heating and cooling time of the heat treatment in the step (2) is 9-11 h.
11. The method of claim 1, wherein step (2) further comprises: before the heat treatment, the soft magnetic material raw belt with the surface containing the protective material in the step (1) is wound and split.
12. The production method according to claim 11, wherein the winding and dividing divides the raw soft magnetic material tape having the surface containing the protective material in the step (1) into rolls having a mass of 1 to 2 kg.
13. The method according to claim 1, wherein the thickness of the insulating paste in the step (3) is 2.5 to 5 μm.
14. The method of claim 13, wherein the insulating glue comprises double-sided tape.
15. The production method according to claim 1, wherein the crushing treatment of step (3) crushes the soft magnetic strip into cracks.
16. The method according to claim 1, wherein the number of layers required in step (4) is 3 to 5.
17. The production method according to claim 1, wherein the coating of step (4) includes: and adhering adhesive tapes on the upper surface and the lower surface of the adhered soft magnetic strip.
18. The method of claim 17, wherein the adhesive tape is a single-sided adhesive tape and/or a double-sided adhesive tape.
19. The method according to claim 1, wherein the step (4) further comprises die cutting the soft magnetic tape after the film coating.
20. The method for preparing according to claim 1, characterized in that it comprises the following steps:
(1) coating a protective material with the thickness of 2-5 mu m on one surface of the soft magnetic material original belt, and curing to obtain the soft magnetic material original belt with the surface containing the protective material;
(2) winding and sub-winding the soft magnetic material original belt with the surface containing the protective material in the step (1) into a coil with the mass of 1-2kg, and carrying out heat treatment at 550 ℃ for 540-120 min, wherein the heat preservation time of the heat treatment is 80-120min, and the heating and cooling time of the heat treatment is 9-11h to obtain a soft magnetic strip;
(3) attaching a double-sided adhesive tape with the thickness of 2.5-5 mu m to one side of the soft magnetic strip material not coated with the protective material in the step (2), and crushing to enable the soft magnetic strip material to be cracked to obtain a crushed soft magnetic strip material;
(4) and (3) taking the crushed soft magnetic strip as a bottom layer, enabling one side of the crushed soft magnetic strip to face upwards, stripping off an adhesive tape protective layer of the double-sided adhesive tape, using the single-layer step (3) on an adhesive layer of the double-sided adhesive tape, laminating one side of the crushed soft magnetic strip, which is coated with a protective material, with the adhesive layer of the double-sided adhesive tape, repeating the laminating operation until the soft magnetic strip reaches the required number of layers, adhering adhesive tapes on the upper surface and the lower surface of the laminated soft magnetic strip, and performing die cutting to obtain the soft magnetic material.
21. A soft magnetic material produced by the production method as set forth in any one of claims 1 to 20.
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| JPS62277048A (en) * | 1986-05-23 | 1987-12-01 | Toshiba Corp | Manufacture of stator coil |
| CN108231316A (en) * | 2016-12-14 | 2018-06-29 | 上海量子绘景电子股份有限公司 | A kind of amorphous nano-crystalline modularization lamination layer, magnetic cell and preparation method thereof |
| CN109109426A (en) * | 2018-06-27 | 2019-01-01 | 横店集团东磁股份有限公司 | A kind of surface treatment method of the nanocrystalline shielding piece of wireless charging |
| CN109451716A (en) * | 2018-11-01 | 2019-03-08 | 横店集团东磁股份有限公司 | A kind of electromagnetic shielding piece and its preparation method and application |
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| JP3606000B2 (en) * | 1997-05-29 | 2004-12-22 | 株式会社明電舎 | Manufacturing, disassembly, transportation and on-site assembly method of disassembled and transport type transformer |
| US7265941B2 (en) * | 2004-02-27 | 2007-09-04 | Hitachi Global Storage Technologies Netherlands B.V. | Self-aligned, notched trailing shield for perpendicular recording |
| CN101650999A (en) * | 2009-08-13 | 2010-02-17 | 太原科技大学 | Fe-based amorphous or nanocrystalline soft magnetic alloy and preparation method thereof |
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| JPS62277048A (en) * | 1986-05-23 | 1987-12-01 | Toshiba Corp | Manufacture of stator coil |
| CN108231316A (en) * | 2016-12-14 | 2018-06-29 | 上海量子绘景电子股份有限公司 | A kind of amorphous nano-crystalline modularization lamination layer, magnetic cell and preparation method thereof |
| CN109109426A (en) * | 2018-06-27 | 2019-01-01 | 横店集团东磁股份有限公司 | A kind of surface treatment method of the nanocrystalline shielding piece of wireless charging |
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