CN110335748B - Magnetic thin sheet based on amorphous or nanocrystalline strip and preparation method thereof - Google Patents
Magnetic thin sheet based on amorphous or nanocrystalline strip and preparation method thereof Download PDFInfo
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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Abstract
The invention belongs to the technical field of wireless charging assemblies, and particularly relates to a magnetic sheet based on an amorphous or nanocrystalline strip, which comprises the amorphous or nanocrystalline strip, wherein an oxide layer is arranged on one surface of the amorphous or nanocrystalline strip, and an insulating heat-conducting adhesive layer, a first graphene oxide layer, an artificial graphite film layer, a second graphene oxide layer and a protective film layer are sequentially arranged on the other surface of the amorphous or nanocrystalline strip; the amorphous or nanocrystalline strip is provided with a scaly structure, a gap is formed between the scaly structures, and the insulating heat-conducting adhesive layer is filled in the gap. Compared with the prior art, the magnetic sheet has the advantages of small thickness, good heat dissipation performance, low eddy current loss and accurate and controllable magnetic conductivity. In addition, the invention also relates to a preparation method of the magnetic sheet based on the amorphous or nanocrystalline strip, which is simple to operate, low in cost and suitable for batch production.
Description
Technical Field
The invention belongs to the technical field of wireless charging assemblies, and particularly relates to a magnetic sheet based on an amorphous or nanocrystalline strip and a preparation method thereof.
Background
For consumer electronics, wireless charging has the advantages of convenience in operation, strong universality and the like. The wireless charging technology is also called non-contact charging, and the wireless charging is realized by using the battery induction or frequency resonance mode generated by the coils arranged on the two sides of the transmitting end and the receiving end respectively. Among them, a metal member such as a battery is generally present near the receiving-end coil, and when wireless charging is performed by battery induction, an eddy current is formed in the metal member. In order to shield these interferences, it is usually necessary to attach a magnetic sheet to the back of the receiving end coil.
Magnetic materials of magnetic flakes that are currently available are mainly soft magnetic ferrites and amorphous and nanocrystalline ribbons. Patent CN104011814A discloses a magnetic field shielding sheet using amorphous and nanocrystalline tapes and a bonding layer stack. The amorphous and nanocrystalline materials in the stack are broken into metal flakes with tiny gaps in between by mechanical force or other means, and the size of the flakes and gaps is determined by process conditions such as the magnitude of mechanical force, and the like, and the flakes and gaps are randomly distributed in size. However, the magnetic permeability of the magnetic sheet is very sensitive to the size of the gap between the fine sheets, and this method cannot control the gap between the fine sheets well, and thus cannot control the range of the magnetic permeability of the magnetic sheet well, and the production efficiency is very low. In addition, in the use process, the magnetic sheet is easy to generate eddy current heating in the magnetic field, and if the heat conduction and the heat dissipation performance are poor, the normal use of the magnetic sheet is affected.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the magnetic sheet based on the amorphous or nanocrystalline strip is provided, and has the advantages of small thickness, good heat dissipation performance, low eddy current loss and accurate and controllable magnetic conductivity.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetic slice based on an amorphous or nanocrystalline strip comprises the amorphous or nanocrystalline strip, wherein an oxide layer is arranged on one surface of the amorphous or nanocrystalline strip, and an insulating heat-conducting adhesive layer, a first graphene oxide layer, an artificial graphite film layer, a second graphene oxide layer and a protective film layer are sequentially arranged on the other surface of the amorphous or nanocrystalline strip; the amorphous or nanocrystalline strip is provided with a scaly structure, a gap is formed between the scaly structures, and the insulating heat-conducting adhesive layer is filled in the gap.
As an improvement of the magnetic sheet based on the amorphous or nanocrystalline strip, the oxidation layer comprises a binder and an oxide, the oxide is at least one of ferric oxide, ferrous oxide and ferroferric oxide, and the binder is polytetrafluoroethylene and/or polyvinylidene fluoride.
As an improvement of the magnetic sheet based on the amorphous or nanocrystalline strip, the insulating heat-conducting adhesive layer comprises polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water.
As an improvement of the amorphous or nanocrystalline strip-based magnetic sheet, the thickness of the oxide layer is 2-20 μm.
As an improvement of the amorphous or nanocrystalline strip-based magnetic sheet, the thickness of the insulating and heat-conducting adhesive layer filled in the gap is 0.01-1 μm, and the thickness of the insulating and heat-conducting adhesive layer arranged on the surface of the amorphous or nanocrystalline strip is 3-20 μm.
As an improvement of the amorphous or nanocrystalline strip-based magnetic sheet, the thickness of the artificial graphite film layer is 12-50 μm.
As an improvement of the amorphous or nanocrystalline strip-based magnetic sheet, the thicknesses of the first graphene oxide layer and the second graphene oxide layer are both 5-20 μm.
As an improvement of the magnetic sheet based on the amorphous or nanocrystalline strip, the protective film layer is a PET insulating film with a single-side back glue.
As an improvement of the amorphous or nanocrystalline strip-based magnetic sheet, the thickness of the protective film layer is 10-100 μm.
Another object of the invention is: the preparation method of the magnetic sheet based on the amorphous or nanocrystalline strip is provided, and comprises the following steps:
1) carrying out heat treatment on the amorphous or nanocrystalline strip, and crushing the amorphous or nanocrystalline strip to obtain an amorphous or nanocrystalline strip with a scaly structure;
2) mixing polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water to prepare an insulating heat-conducting glue solution;
3) pouring the insulating heat-conducting glue solution obtained in the step 2) on one surface of the amorphous or nanocrystalline strip with the scaly structure obtained in the step 1), filling part of the insulating heat-conducting glue solution into gaps of the scaly structure, and uniformly covering the other part of the insulating heat-conducting glue solution on the surface of the amorphous or nanocrystalline strip to form an insulating heat-conducting glue layer, wherein the iron-containing hydrogen phosphate and the amorphous or nanocrystalline strip are phosphated;
4) taking an artificial graphite film, spraying or depositing a first graphene oxide layer on one surface of the artificial graphite film, and spraying or depositing a second graphene oxide layer on the other surface of the artificial graphite film;
5) pasting the surface, which is sprayed with the first graphene oxide layer, of the artificial graphite film obtained in the step 4) on the insulating heat-conducting adhesive layer;
6) attaching an insulating film to the second graphene oxide layer;
7) and mixing the binder and the oxide to obtain an oxidation slurry, coating the oxidation slurry on the other surface of the amorphous or nanocrystalline strip to form an oxidation layer, and obtaining the magnetic sheet based on the amorphous or nanocrystalline strip.
Compared with the prior art, the invention has the beneficial effects that:
1) the amorphous or nanocrystalline strip has the scaly structure, gaps exist among the scaly structures, and the insulating heat-conducting adhesive layer is filled in the gaps, so that the contact area among the scaly structures can be reduced, the contact resistance is increased, and the eddy current loss is reduced to the maximum extent; in addition, the gap of the scale-shaped structure can be controlled by changing the thickness of the insulating heat-conducting adhesive layer, and finally, the magnetic permeability of the magnetic sheet can be accurately controlled. In addition, the oxide layer has high resistivity, can play an insulating role, can also reduce eddy current loss, and improves the charging efficiency.
2) According to the invention, the insulating heat-conducting adhesive layer, the first graphene oxide layer, the artificial graphite film and the second graphene oxide layer are sequentially arranged on one surface of the amorphous or nanocrystalline strip, wherein the graphene oxide has good heat-conducting property and mechanical property, so that the heat dissipation performance and strength of the magnetic sheet are improved while the magnetic sheet is light and thin. In addition, the surface of the graphene oxide is rich in functional groups, so that the graphene oxide film has very strong binding capacity with an artificial graphene film, strong coating adhesion and durability. Moreover, the graphene oxide is low in price, easy to obtain raw materials, convenient to prepare and capable of realizing large-scale preparation and application.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Wherein: the material comprises 1-amorphous or nanocrystalline strips, 2-oxide layers, 3-insulating heat conducting adhesive layers, 4-first graphene oxide layers, 5-artificial graphene film layers, 6-second graphene oxide layers, 7-protective film layers and 11-gaps.
Detailed Description
As shown in fig. 1, a magnetic sheet based on an amorphous or nanocrystalline strip includes an amorphous or nanocrystalline strip 1, one side of the amorphous or nanocrystalline strip 1 is provided with an oxide layer 2, and the other side of the amorphous or nanocrystalline strip 1 is sequentially provided with an insulating and heat-conducting adhesive layer 3, a first graphene oxide layer 4, an artificial graphite film layer 5, a second graphene oxide layer 6 and a protective film layer 7; the amorphous or nanocrystalline strip 1 has a scaly structure, a gap 11 exists between the scaly structures, and the gap 11 is filled with the insulating heat-conducting adhesive layer 3.
Further, the oxide layer 1 includes a binder and an oxide, and the oxide is at least one of ferric oxide, ferrous oxide and ferroferric oxide. The binder is polytetrafluoroethylene and/or polyvinylidene fluoride. The thickness of the oxide layer 1 is 2 to 20 μm.
Further, the insulating heat-conducting adhesive layer 3 comprises polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water. The thickness of the insulating and heat-conducting adhesive layer 3 filled in the gap 11 is 0.01-1 μm, and the thickness of the insulating and heat-conducting adhesive layer 3 arranged on the surface of the amorphous or nanocrystalline strip 1 is 3-20 μm.
Further, the thickness of the artificial graphite film layer 5 is 12-50 μm. The thickness of the first graphene oxide layer 4 and the second graphene oxide layer 6 is 5-20 μm.
Further, the protective film layer 7 is a PET insulating film with one side being back-glued. The thickness of the protective film layer 7 is 10 to 100 μm.
The present invention will be described in further detail with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.
Example 1
Preparation of magnetic flakes based on amorphous or nanocrystalline strips:
firstly, carrying out heat treatment and crushing on an amorphous or nanocrystalline strip with the thickness of 100 mu m to obtain an amorphous or nanocrystalline strip with a scaly structure; secondly, polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water are mixed to prepare insulating heat-conducting glue solution, the insulating heat-conducting glue solution is poured on one surface of an amorphous or nanocrystalline strip with a scaly structure, part of the insulating heat-conducting glue solution is filled in gaps of the scaly structure to form an insulating heat-conducting glue layer with the thickness of 0.01 mu m, the other part of the insulating heat-conducting glue solution is uniformly covered on the surface of the amorphous or nanocrystalline strip to form an insulating heat-conducting glue layer with the thickness of 3 mu m, wherein the iron-containing hydrogen phosphate and the amorphous or nanocrystalline strip are phosphated; then, taking an artificial graphite film with the thickness of 12 microns, spraying or depositing a first graphene oxide layer with the thickness of 5 microns on one surface of the artificial graphite film, and spraying or depositing a second graphene oxide layer with the thickness of 5 microns on the other surface of the artificial graphite film; one surface sprayed with the first graphene oxide layer is attached to the insulating and heat-conducting adhesive layer, and meanwhile, an insulating film with the thickness of 10 microns is attached to the second graphene oxide layer; and finally, mixing polytetrafluoroethylene and ferric oxide to obtain oxidized slurry, and coating the oxidized slurry on the other surface of the amorphous or nanocrystalline strip to form an oxide layer with the thickness of 2 microns to obtain the magnetic sheet based on the amorphous or nanocrystalline strip.
Example 2
Preparation of magnetic flakes based on amorphous or nanocrystalline strips:
firstly, carrying out heat treatment and crushing on an amorphous or nanocrystalline strip with the thickness of 100 mu m to obtain an amorphous or nanocrystalline strip with a scaly structure; secondly, polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water are mixed to prepare insulating heat-conducting glue solution, the insulating heat-conducting glue solution is poured on one surface of an amorphous or nanocrystalline strip with a scaly structure, part of the insulating heat-conducting glue solution is filled in gaps of the scaly structure to form an insulating heat-conducting glue layer with the thickness of 1 micrometer, the other part of the insulating heat-conducting glue solution is uniformly covered on the surface of the amorphous or nanocrystalline strip to form an insulating heat-conducting glue layer with the thickness of 20 micrometers, and the iron-containing hydrogen phosphate and the amorphous or nanocrystalline strip are phosphated; then, taking an artificial graphite film with the thickness of 50 microns, spraying or depositing a first graphene oxide layer with the thickness of 20 microns on one surface of the artificial graphite film, and spraying or depositing a second graphene oxide layer with the thickness of 20 microns on the other surface of the artificial graphite film; one surface sprayed with the first graphene oxide layer is attached to the insulating and heat-conducting adhesive layer, and meanwhile, an insulating film with the thickness of 100 mu m is attached to the second graphene oxide layer; and finally, mixing polyvinylidene fluoride and ferroferric oxide to obtain oxidation slurry, and coating the oxidation slurry on the other surface of the amorphous or nanocrystalline strip to form an oxidation layer with the thickness of 20 microns to obtain the magnetic sheet based on the amorphous or nanocrystalline strip.
Example 3
Preparation of magnetic flakes based on amorphous or nanocrystalline strips:
firstly, carrying out heat treatment and crushing on an amorphous or nanocrystalline strip with the thickness of 100 mu m to obtain an amorphous or nanocrystalline strip with a scaly structure; secondly, polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water are mixed to prepare insulating heat-conducting glue solution, the insulating heat-conducting glue solution is poured on one surface of an amorphous or nanocrystalline strip with a scaly structure, part of the insulating heat-conducting glue solution is filled in gaps of the scaly structure to form an insulating heat-conducting glue layer with the thickness of 0.05 mu m, the other part of the insulating heat-conducting glue solution is uniformly covered on the surface of the amorphous or nanocrystalline strip to form an insulating heat-conducting glue layer with the thickness of 10 mu m, wherein the iron-containing hydrogen phosphate and the amorphous or nanocrystalline strip are phosphated; then, taking an artificial graphite film with the thickness of 30 microns, spraying or depositing a first graphene oxide layer with the thickness of 12 microns on one surface of the artificial graphite film, and spraying or depositing a second graphene oxide layer with the thickness of 12 microns on the other surface of the artificial graphite film; one surface sprayed with the first graphene oxide layer is attached to the insulating and heat-conducting adhesive layer, and meanwhile, an insulating film with the thickness of 50 microns is attached to the second graphene oxide layer; and finally, mixing polytetrafluoroethylene, polyvinylidene fluoride, ferrous oxide and ferric oxide to obtain oxidized slurry, coating the oxidized slurry on the other surface of the amorphous or nanocrystalline strip to form an oxide layer with the thickness of 10 mu m, and obtaining the amorphous or nanocrystalline strip-based magnetic sheet.
Comparative example 1
Preparation of magnetic flakes based on amorphous or nanocrystalline strips:
firstly, carrying out cracking treatment on an amorphous or nanocrystalline strip with the thickness of 100 mu m to obtain a plurality of amorphous or nanocrystalline fragment units with gaps of 5 mu m; then, forming an insulating glue layer with the thickness of 100 mu m on the surfaces of the amorphous or nanocrystalline fragment units and in the gaps; and finally, arranging a graphite layer with the thickness of 50 mu m on the surface of the insulating glue layer to obtain the amorphous or nanocrystalline strip-based magnetic sheet.
Test results
The magnetic sheets obtained in examples 1 to 3 and comparative example were tested, and the results are shown in table 1.
TABLE 1 test results
As can be seen from table 1, compared with the magnetic sheet of comparative example 1, the magnetic sheets of examples 1 to 3 have thinner thickness, smaller magnetic resistance, larger inductance, and larger thermal conductivity, that is, the magnetic sheet prepared by the present invention has better magnetic shielding and heat dissipation performance. This is because:
1) the amorphous or nanocrystalline strip has the scaly structure, gaps exist among the scaly structures, and the insulating heat-conducting adhesive layer is filled in the gaps, so that the contact area among the scaly structures can be reduced, the contact resistance is increased, and the eddy current loss is reduced to the maximum extent; in addition, the gap of the scaly structure can be controlled by changing the thickness of the insulating heat-conducting adhesive layer, and finally the magnetic conductivity of the magnetic sheet is accurately controllable, the thickness of the insulating heat-conducting adhesive layer positioned in the gap in the embodiments 1-3 is obviously lower than that in the comparative example 1, the thickness is as small as possible while insulation is realized, the magnetic resistance can be reduced, and the magnetic conductivity and the inductance can be improved. In addition, the oxide layer has high resistivity, can play an insulating role, can also reduce eddy current loss, and improves the charging efficiency.
2) According to the invention, the insulating heat-conducting adhesive layer, the first graphene oxide layer, the artificial graphite film and the second graphene oxide layer are sequentially arranged on one surface of the amorphous or nanocrystalline strip, wherein the graphene oxide has good heat-conducting property, so that the magnetic sheet is light and thin, and the heat radiation performance of the magnetic sheet is improved.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (9)
1. A magnetic sheet based on amorphous or nanocrystalline ribbon, characterized in that: the material comprises an amorphous or nanocrystalline strip, wherein an oxide layer is arranged on one surface of the amorphous or nanocrystalline strip, and an insulating heat-conducting adhesive layer, a first graphene oxide layer, an artificial graphite film layer, a second graphene oxide layer and a protective film layer are sequentially arranged on the other surface of the amorphous or nanocrystalline strip; the amorphous or nanocrystalline strip has a scaly structure, gaps exist among the scaly structures, and the insulating heat-conducting adhesive layer is filled in the gaps;
the insulating heat-conducting adhesive layer comprises polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water.
2. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the oxide layer comprises a binder and an oxide, the oxide is at least one of ferric oxide, ferrous oxide and ferroferric oxide, and the binder is polytetrafluoroethylene and/or polyvinylidene fluoride.
3. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the thickness of the oxide layer is 2-20 μm.
4. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the thickness of the insulating heat-conducting adhesive layer filled in the gap is 0.01-1 mu m, and the thickness of the insulating heat-conducting adhesive layer arranged on the surface of the amorphous or nanocrystalline strip is 3-20 mu m.
5. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the thickness of the artificial graphite film layer is 12-50 mu m.
6. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the thickness of the first graphene oxide layer and the thickness of the second graphene oxide layer are both 5-20 microns.
7. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the protective film layer is a PET insulating film with a single-side back glue.
8. Amorphous or nanocrystalline ribbon-based magnetic flake according to claim 1, characterized in that: the thickness of the protective film layer is 10-100 mu m.
9. A method for preparing magnetic flakes based on amorphous or nanocrystalline ribbon according to any one of claims 1 to 8, characterized in that it comprises the following steps:
1) carrying out heat treatment on the amorphous or nanocrystalline strip, and crushing the amorphous or nanocrystalline strip to obtain an amorphous or nanocrystalline strip with a scaly structure;
2) mixing polytetrafluoroethylene, hydroxyethyl acrylate, heat-conducting filler, iron hydrogen phosphate and deionized water to prepare an insulating heat-conducting glue solution;
3) pouring the insulating heat-conducting glue solution obtained in the step 2) on one surface of the amorphous or nanocrystalline strip with the scaly structure obtained in the step 1), filling part of the insulating heat-conducting glue solution into gaps of the scaly structure, and uniformly covering the other part of the insulating heat-conducting glue solution on the surface of the amorphous or nanocrystalline strip to form an insulating heat-conducting glue layer, wherein the iron-containing hydrogen phosphate and the amorphous or nanocrystalline strip are phosphated;
4) taking an artificial graphite film, spraying or depositing a first graphene oxide layer on one surface of the artificial graphite film, and spraying or depositing a second graphene oxide layer on the other surface of the artificial graphite film;
5) pasting the surface, which is sprayed with the first graphene oxide layer, of the artificial graphite film obtained in the step 4) on the insulating heat-conducting adhesive layer;
6) attaching an insulating film to the second graphene oxide layer;
7) and mixing the binder and the oxide to obtain an oxidation slurry, coating the oxidation slurry on the other surface of the amorphous or nanocrystalline strip to form an oxidation layer, and obtaining the magnetic sheet based on the amorphous or nanocrystalline strip.
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| CN208385121U (en) * | 2018-07-02 | 2019-01-15 | 苏州世诺新材料科技有限公司 | A kind of wireless charging heat radiating type magnetic conduction sheet |
| CN109245325A (en) * | 2018-09-29 | 2019-01-18 | 深圳市美信电子有限公司 | It is a kind of to radiate every magnetic adhesive tape and wireless charging power receiver |
| CN109640609A (en) * | 2018-11-21 | 2019-04-16 | 江苏斯瑞达新材料科技有限公司 | A kind of magnetic shield piece and its processing method |
| CN109881038A (en) * | 2019-03-08 | 2019-06-14 | 深圳先进技术研究院 | A kind of thermally conductive electromagnetic shielding composite material and preparation method thereof |
| CN110335748A (en) * | 2019-07-25 | 2019-10-15 | 东莞市鸿亿导热材料有限公司 | A kind of magnetic flakes and preparation method thereof based on amorphous or nanocrystalline strip |
| CN110415952A (en) * | 2019-07-25 | 2019-11-05 | 东莞市鸿亿导热材料有限公司 | A kind of wireless charging heat radiating type magnetic conduction sheet and preparation method thereof |
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