KR101755607B1 - Magnetic shielding materials of wireless power transfer apparatus, manufacturing method of the same - Google Patents
Magnetic shielding materials of wireless power transfer apparatus, manufacturing method of the same Download PDFInfo
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- KR101755607B1 KR101755607B1 KR1020160003200A KR20160003200A KR101755607B1 KR 101755607 B1 KR101755607 B1 KR 101755607B1 KR 1020160003200 A KR1020160003200 A KR 1020160003200A KR 20160003200 A KR20160003200 A KR 20160003200A KR 101755607 B1 KR101755607 B1 KR 101755607B1
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- soft magnetic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
-
- H02J17/00—
-
- H02J7/025—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The present invention relates to a soft composite material for shielding a magnetic field of an antenna coil for wireless power transmission and a manufacturing method thereof. In one embodiment of the present invention, a soft magnetic composite material for shielding a magnetic field has a predetermined real permeability Phase soft magnetic metal powder of 85 to 97 wt% and a solid thermosetting binder can be mixed and hot-pressed to form an integral process without restriction of shape, and the soft magnetic composite material Can have a density of 4.4 to 5.4 g / cc and a high real negative permeability of 60 to 150 in the frequency band of 100 to 200 kHz. Further, the soft composite material according to the present invention has an advantage that the charging efficiency can be improved by effectively shielding the AC magnetic field generated from the antenna coil of the wireless power transmission module to focus the magnetic flux and minimize the influence of the external magnetic field.
Description
The present invention relates to a soft magnetic composite material for shielding the magnetic field of an antenna coil for wireless power transmission and a method of manufacturing the same. More particularly, the present invention relates to a soft magnetic composite material And more particularly, to a magnetic shielding material of a wireless power transmission device capable of effectively improving power transmission efficiency by effectively shielding an AC magnetic field by focusing a flux field, a method of manufacturing the same, and a wireless charging module having the same.
Wireless power transmission technology is a technique of transforming electric energy into magnetic field or electromagnetic wave and transmitting without using wires. The wireless power transmission method is divided into a magnetic induction method using the magnetic induction phenomenon between the transmitting and receiving coils, a magnetic resonance method using the magnetic resonance characteristic between the transmitting and receiving resonators, and a microwave method using the radiation characteristic between the transmitting and receiving antennas in the microwave band . Among the three wireless power transmission methods, the magnetic induction method has already been standardized and has been adopted in portable electronic devices such as smart phones and commercialized, and technology for improving the wireless charging efficiency is actively being developed.
More specifically, in the magnetic induction method, an alternating magnetic field that is induced while a current flows in one coil (a transmitter antenna coil and a Tx coil) of two antenna coils at a relatively short distance (within several millimeters) Rx coils) and induction currents are generated in the antenna coil of the receiver by the induction magnetic field, so that the products connected to the antenna coil of the receiver antenna can be charged.
In order to improve the charging efficiency of the wireless charging module adopting the magnetic induction method, it is indispensably required to improve the inductance of the coil by focusing the magnetic field induced in the transmitting antenna coil and the receiving antenna coil without loss.
If a metallic material is present at a position adjacent to the receiving antenna coil forming the induction current by the magnetic field induced from the transmitting antenna coil, an eddy current is formed in the metallic material by the induction magnetic field generated in the receiving antenna coil, It may cause malfunction such as forming another induction magnetic field (causing interference with an induced magnetic field generated at the receiving antenna coil) or generating heat to lower the power transmission efficiency of the wireless power.
Therefore, the transmitting antenna coil and the receiving antenna coil constitute a charging module by collecting the induced magnetic field generated from the coil without loss and attaching a magnetic shielding material so as to shield an unnecessary magnetic field formed from an external device.
Generally, in order to improve the wireless charging efficiency, the magnetic shielding material for the antenna coil of the wireless charging module has high permeability and low loss factor (tangent loss, tan δ) in the operating frequency band of 100 to 200 kHz Heat-dissipating properties are used. Commercially, Fe-Si-B amorphous ribbons, flat soft magnetic metal powders, and Mn-Zn ferrite sintered bodies are used as main components of magnetic shielding materials.
In this connection, Korean Patent No. 10-1494438 (hereinafter referred to as "Prior Art 1") discloses a method for preparing a magnetic powder in which Mn-Zn ferrite and Fe-Si alloy powder are mixed A step of mixing the prepared magnetic powder and the polymer for 10 to 12 hours to prepare a slurry, a step of molding the slurry into a sheet at a forming speed of 0.7 to 1.2 m / min, a step of laminating the formed sheet, And a step of preparing a sample. The method for producing a ferrite magnetic composite sheet according to the present invention has been disclosed.
Further, Japanese Patent No. 10-0475768 (hereinafter, referred to as a method for producing a composite magnetic sheet, hereinafter referred to as " Conventional Technique 2 ") discloses a method in which soft magnetic metal powder is subjected to slicing treatment and then mixed with a thermoplastic binder to prepare two Discloses a technique for producing a composite magnetic sheet by processing into a sheet form by a calendering process in which the sheet is rolled between rolls.
In addition, JP 10389781 (entitled "COMPOSITE MAGNETIC APPARATUS, COMPOSITE CHARGER ELEMENT SHEET, AND METHOD FOR MANUFACTURING THE SAME", hereinafter referred to as "Prior Art 3") discloses a method for producing a soft magnetic metal powder by flattening a flat soft magnetic metal powder The present invention relates to a method for producing a composite magnetic sheet in which a composition is prepared by mixing a liquid binder with a liquid binder at a predetermined ratio, drying the mixture to prepare a sheet, and then laminating sheets prepared in the same manner and then hot- Technology.
The prior art 1 discloses a technique for producing a ferrite magnetic composite sheet including a magnetic powder containing Mn-Zn ferrite and Fe-Si powder. However, in the same manufacturing method as in the prior art 1, It is difficult to manufacture a sheet containing a magnetic powder powder capable of containing 90% by weight or more of a magnetic powder capable of being contained in a ferrite material. There is a disadvantage in that it can affect.
The prior art 2 adopts a method of producing a sheet by mixing a flaky soft magnetic metal powder and a thermoplastic binder at a predetermined ratio and then hot rolling to obtain a sheet. However, as in the prior art 1, when the soft magnetic metal powder contains 90 wt% There is a problem in that the formability is significantly lowered and the residual stress is generated during the hot rolling process, which lowers the permeability of the composite magnetic sheet finally produced.
In the prior art 3, since a composite magnetic sheet is produced by laminating sheets produced by printing and drying a mixture of a soft magnetic metal powder and a binder and hot pressing them, it is difficult to manufacture a magnetic material having a specific shape other than a sheet .
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a radio frequency power transmission device and a method of controlling the same, The metal powder is mixed with the binder at a predetermined ratio and hot press-molded to obtain a soft magnetic material for magnetic field shielding of a wireless power transmission antenna coil having a high permeability and a low loss coefficient, A composite material for magnetic field shielding, and a wireless charging module having the same.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.
According to an aspect of the present invention, there is provided a method for manufacturing a soft magnetic metal powder, comprising: uniformizing a soft magnetic metal powder so as to have a predetermined shape; 3 to 15 wt% in a predetermined ratio; and a forming step of hot-pressing the mixture obtained in the step of preparing the mixture and shaping the mixture to have a predetermined shape, for magnetic field shielding of the antenna coil for wireless power transmission A method for manufacturing a soft magnetic composite material is provided.
In the embodiment of the present invention, the particles of the flaky soft magnetic metal powder may have an average particle diameter (D50) of 40 to 80 mu m.
In the embodiment of the present invention, the grain of the flaky soft magnetic metal powder may have an apparent density of 0.3 to 0.7 g / cc and an aspect ratio of 10 to 60.
In the embodiment of the present invention, the method may further include an insulating treatment step of forming an insulating layer on the surface of the particles of the flaky soft metal powder between the smoothing step and the forming step.
In an embodiment of the present invention, the forming step may be carried out at a temperature of from 150 to 190 캜.
In an embodiment of the present invention, the thermosetting binder may be characterized as being solid.
In the embodiment of the present invention, the forming step may be characterized in that the mixture of the flaky soft magnetic metal powder and the thermosetting binder is hot pressed for 2 to 30 minutes so as to have a predetermined shape.
In the embodiment of the present invention, the soft magnetic metal powder in the smoothing step is Fe-Si-Al alloy powder, Fe-Ni alloy powder and Ni-Fe-Mo alloy powder, Fe-Si alloy powder, Fe-Co alloy Powder, an Fe-Cr-Si alloy powder, an Fe-Al alloy powder, and an Fe-Cr alloy powder.
According to another aspect of the present invention, there is provided a soft magnetic composite material for shielding a magnetic field of an antenna coil for wireless power transmission manufactured by the manufacturing method.
In the embodiment of the present invention, the soft magnetic composite material has a density of 4.4 to 5.4 g / cc and an actual permeability of 60 to 150 in a frequency band of 100 to 200 kHz.
According to another aspect of the present invention, there is provided a wireless charging module including a soft magnetic composite material for shielding a magnetic field of an antenna coil for wireless power transmission manufactured by the manufacturing method.
According to an embodiment of the present invention, soft magnetic metal powder is flattened so as to have a predetermined shape in order to improve the magnetic permeability of the material for shielding magnetic field, and a binder having a minimum amount required for the molding process is applied to the surface of the flat soft magnetic metal powder Shielding material containing at least 85 wt%, preferably at least 90 wt%, of the flat soft magnetic metal powder is coated on the surface of the magnetic shielding material to improve the magnetic permeability of the magnetic shielding material, , The wireless charging efficiency can be improved.
A second effect is that a magnetic material shielding material having a high degree of orientation and high density (4.2 g / cc or more) can be produced by hot press-molding a mixture prepared by mixing 90 wt% or more of a flaky soft magnetic metal powder with a binder, It has a third effect that it is charged into a mold having a predetermined shape and is hot-pressed so that the molding can be easily performed by an integral process without restriction of the shape.
As described above, the composite material for magnetic field shielding of a wireless power transmission antenna coil according to the present invention has a magnetic shielding material having excellent physical properties with high permeability and low loss coefficient due to improvement of input amount and density of soft magnetic metal powder, And it is possible to improve the efficiency of wireless charging by the use of the magnetic material shielding material, and it is possible to easily form the end portion, the concave and convex portion, the groove portion and the curved surface having a predetermined height, .
It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.
FIG. 1 is a schematic view of an endless ring-type soft magnetic composite material for magnetic field shielding of an antenna coil for wireless power transmission manufactured according to an embodiment of the present invention.
FIG. 2 is a schematic view of a ring-type soft magnetic composite material for shielding a magnetic field with an end of an antenna coil for wireless power transmission manufactured according to an embodiment of the present invention.
3 is an actual photograph of a magnetic shielding material for a power receiving antenna coil of a wireless power transmission module manufactured according to an embodiment of the present invention.
4 is a SEM photograph of a flaky soft magnetic metal powder that has been flattened according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
As used herein, the average particle diameter (D50) means a particle diameter corresponding to 50% of the weight percentage in the particle size distribution curve of 100% of the total weight, and the effective particle diameter (D10) is 10% Means the particle diameter, and the effective particle diameter (D90) means the particle diameter corresponding to 90% of the weight percentage.
Disclosure of Invention Technical Problem [10] The present invention provides a magnetic field shielding device for a wireless power transmission coil having characteristics suitable for an electromagnetic induction type wireless power transmission system operating in a frequency band of 100 to 200 kHz, The present invention relates to a method for producing a composite material. The manufacturing method of the present invention includes a step of smoothing the soft magnetic metal powder so as to have a predetermined shape, a step of smoothing the soft magnetic metal powder and the thermosetting binder in a predetermined ratio at a ratio of 85 to 97 wt% A molding step in which the mixture obtained in the step of preparing the mixture to be mixed and the step of preparing the mixture is hot-pressed and molded to have a predetermined shape can be used as a main manufacturing step.
Hereinafter, the present invention will be described in detail in the above-described manner for each manufacturing step.
One. Soft magnetic Of metal powder Piecewise step
The smoothing step of the present invention is carried out to improve the real permeability and moldability of the material finally produced by processing the soft magnetic metal powder to have a predetermined shape.
The soft magnetic metal powder may be Fe-Si-Al alloy powder, Fe-Ni alloy powder, Ni-Fe-Mo alloy powder, Fe-Si alloy powder, Fe-Co alloy powder, Alloy powder, Fe-Cr-Si alloy powder, Fe-Al alloy powder and Fe-Cr alloy powder. Since the soft magnetic alloy powder has excellent saturation magnetization (Bs) performance and is not easily saturated particularly in the operating frequency range of 100 to 200 kHz of the wireless charging module, it is applied to the antenna coil of the wireless power transmission device to effectively shield the magnetic field .
In the present invention, in order to improve the moldability in manufacturing a composite material for shielding electromagnetic waves using the soft magnetic metal powder having the above-mentioned characteristics and to maximize the filling rate of the soft magnetic metal powder in the material, Can be performed.
In the present invention, the particles of the soft magnetic metal powder obtained through the kneading step have an average particle diameter (D50) of 40 to 80 mu m, an apparent density of 0.3 to 0.7 g / cc and an aspect ratio of 10 to 60 .
When the average grain size (D50) of the soft magnetic metal powder particles obtained through the kneading step is less than 40 mu m, the magnetic permeability may be low and thus may not be suitable as a material for shielding the magnetic field. It is possible to cause scratches or defects in the process of forming the soft magnetic material to have a predetermined shape with a relatively large particle size and the surface of the soft magnetic material to be finally produced is not smooth, And the average particle diameter (D50) of the flat soft magnetic metal powder may preferably be in the above range.
The permeability of the soft magnetic metal powder varies depending on the degree of flattening. When the apparent density representing the degree of flattening of the soft magnetic metal powder is less than 0.3 g / cc, or when the aspect ratio exceeds 60, The specific surface area of the magnetic metal powder particles is too large to contain the binder in an amount of 15 wt% or more, which may be difficult to improve the permeability. In order to improve the filling ratio of the soft magnetic metal powder A high pressing force may be required, which may be undesirable from the viewpoint of improving the permeability of the material and the workability. When the apparent density of the particles of the soft magnetic metal powder is more than 0.7 g / cc or the aspect ratio is less than 10, there may be a problem that the anisotropy of the soft magnetic metal powder particles is low and the magnetic permeability is lowered. The apparent density and the aspect ratio of the flat soft magnetic metal powder may preferably be in the above range.
In one embodiment of the present invention, the smecticization of the soft magnetic metal powder may be possible by milling the soft magnetic metal powder for a predetermined period of time. The milling method is not limited and may be, but is not limited to, ball milling, attrition milling, bead milling, ultrasonic milling, etc., It may be desirable to wet mill with a dispersing agent in order to minimize the stress applied to the substrate and to enable uniform processing.
More preferably, the flat soft magnetic metal powder can be obtained by wet-attrition milling the soft magnetic metal powder by applying a dispersing agent such as toluene, ethanol, methanol, methyl ethyl ketone and cyclohexane, but is not limited thereto do. In order to control the average particle diameter (D50), the apparent density and the aspect ratio, it is necessary to consider the size of the ball to be applied to the milling process, the charging rate of the milling balls to the powder, and the milling time.
When the soft magnetic metal powder is to be flattened by wet milling in accordance with an embodiment of the present invention, the flaky metal powder is dried for a predetermined time in an inert gas atmosphere after the finishing step, A drying step of removing a dispersant, moisture, and the like.
2. Piece Soft magnetic Insulation treatment step of metal powder
In the embodiment of the present invention, the method may further include an insulating treatment step of forming an insulating layer on the surface of the particles of the flaky soft metal powder between the smoothing step and the forming step. The insulating layer formed on the particle surface can minimize the eddy current loss by increasing the electrical resistance. Specifically, the insulating layer can be formed using an inorganic insulating material or an organic insulating material. More specifically, the inorganic insulating material may be selected from inorganic polymers such as polysilazane, metal oxides such as silica, titania, magnesia and alumina, phosphates such as zinc phosphate, iron phosphate and manganese phosphate and sulfates. But are not limited to, organic coupling agents such as silane-based coupling agents and titanium-based coupling agents, or organic polymers. However, in order to enable the production of a high-density soft magnetic bond material by providing a bond between the soft magnetic metal powders which can minimize the eddy current loss and have no mutual bonding, an organic insulating material is used to form each particle It may be desirable to form an insulating layer on the surface.
3. Piece Soft magnetic Metal Powder and Binder Mix Preparation Step
The mixture preparation step of the present invention is a step of mixing the flaky soft metal powder and the binder at a predetermined ratio, preferably 85 to 97 wt% of the flaky soft magnetic metal powder and 3 to 15 wt% of the binder to prepare a mixture . As described above, the soft magnetic bondable magnetic material for magnetic shielding according to the present invention is formed by coating the surface of the flat soft magnetic metal powder with the minimum amount of binder required for molding in a form suitable for mounting on a product, Shielding material can be manufactured by increasing the density of the magnetic material shielding material by increasing the density of the magnetic material, thereby making it possible to manufacture a magnetic shielding material having a high magnetic permeability.
When the content of the soft magnetic metal powder is higher, it may be advantageous to secure the magnetic permeability. However, when the amount of the soft magnetic metal powder exceeds 97 wt%, the content of the binder capable of ensuring the connectivity between the particles of the soft magnetic metal powder It may be difficult or even impossible to form the molding into a shape suitable for mounting on a desired product. More preferably, the flat soft magnetic metal powder may be mixed in an amount of 90 to 95 wt%, considering the workability in the molding step.
The binder of the present invention provides bondability between the flat soft magnetic metal particles having extremely low mutual bondability between particles, and preferably the binder can be a thermosetting resin. The thermosetting resin is excellent in durability and heat resistance and has an advantage that the molding process can be facilitated because the fluidity is not too high even when heat is applied in the molding step to be described later. Further, the thermosetting binder may be a solid phase powder, which is transformed from a solid phase to a liquid phase having fluidity by the heat applied in the molding step, and a thermosetting binder having fluidity in the pores between the particles of the soft magnetic metal powder Since it is possible to produce a magnetic shielding material having a uniform composition, it may be preferable that the binder is gradually cured.
Specifically, the thermosetting binder is selected from the group consisting of a phenol resin, a urea resin, a melamine resin, a Teflon, a polyamide, a polyvinyl chloride, a flame retardant polyethylene, a flame retardant polypropylene, a flame retardant polystyrene, a polyphenyline sulfide, a flame retardant polyethylene terephthalate, But are not limited to, flame retardant polyolefin, silicone resin, chlorinated polyethylene, ethylene propylene dimethyl, acrylic resin, amide resin, polyester resin, polyethylene resin, ethylene-propylene rubber, polyvinyl butyral resin, polyurethane resin, nitrile- But it is not limited to this.
4. Piece Soft magnetic Forming step of metal powder / binder mixture
The forming step of the present invention is a step of hot pressing a mixture of the flaky soft magnetic metal powder and the binder to have a predetermined shape.
In embodiments of the present invention, it may be desirable for hot pressing to be carried out at a temperature of from 150 to 190 캜, which, when the molding temperature is less than 150 캜, causes molding of the thermosetting binder contained in the mixture to a temperature insufficient to cause curing The workability of the process may deteriorate or the molding time may be prolonged. When the molding temperature exceeds 190 DEG C, the binder component is not sufficiently penetrated into the voids between the particles of the flat soft magnetic metal powder by the rapid curing of the thermosetting binder, It may be undesirable because the permeability may be lowered.
In addition, in the forming step of the present invention, the pressure applied to the mixture of the flaky soft magnetic metal powder and the thermosetting binder may preferably be 1 to 4 ton / cm 2 . However, the pressure applied in the molding step may be varied depending on the shape of the final product to be manufactured, the content ratio of the soft magnetic metal powder and the thermosetting binder, the temperature condition in the molding step, etc., But is not limited to.
In the forming step, the flaky soft metal powder is plastically deformed by an external pressure to be processed into a desired formation, and the specimen of the flaky metal powder can be oriented in the lateral direction parallel to the magnetic shielding material, so that the density of the material can be improved. However, when the pressure applied in the forming step is too small, it may be difficult to produce a magnetic shielding material having a desired thickness and shape at an insufficient pressure for plastic deformation of the soft magnetic metal powder, It is difficult to sufficiently ensure the orientation of particles of the powder, and it may be difficult to produce a high-density magnetic shielding material. Also, when the pressure applied in the forming step is excessively large, excessive pressure may be applied to cause a problem that the permeability is lowered due to accumulation of residual stress in the material.
In addition, when pressure is applied in the molding step, it is possible to perform molding by applying uniaxial pressing or isostatic pressing, and it is also possible to perform the two pressing methods sequentially and / or repeatedly.
In the embodiment of the present invention, in the forming step, the mixture of the flaky soft magnetic metal powder and the thermosetting binder can be hot-pressed for 2 to 30 minutes. If the hot pressing time is less than 2 minutes, the thermosetting binder may not be cured and molding operation may be difficult, and the orientation of the flat soft magnetic metal powder in the material may be difficult And the permeability can be lowered. If the hot pressing time is more than 30 minutes, the residual stress in the material may be increased, and the magnetic permeability of the soft magnetic metal powder may be limited. In addition, .
The composite material for shielding magnetic field according to the present invention comprises 90 wt% or more of a flat soft magnetic metal powder having a controlled shape so as to effectively shield a magnetic field in an operating frequency band of a wireless power transmission coil, g / cc of high density soft magnetic bond material, and can be integrally formed without restriction of shape. The composite material for magnetic field shielding manufactured by the manufacturing method according to the present invention may have a real magnetic permeability of 60 to 150 at 100 to 200 kHz, which is an operating frequency band of the electromagnetic induction type wireless power transmission device. In addition, the composite material manufactured according to the present invention has an advantage that tangent loss (tan δ) is low as the real permeability is high and the imaginary part permeability is low.
In addition, the manufacturing method according to the present invention can be manufactured in a complicated shape that is suitable for mounting on the antenna coil for wireless power transmission and has predetermined irregularities on a predetermined portion so as to be advantageous for improving the inductance of the coil, It is expected that the manufacturing cost of the magnetic composite material can be reduced.
1 is a schematic view of a ring-type magnetic field shielding composite material for shielding a magnetic field of a wireless power transmission antenna coil according to an embodiment of the present invention. The shape of the material for shielding the magnetic field is not limited to the ring shape, and it can be manufactured in a sheet shape having no hole in the inside, and it can be manufactured in various forms such as a circle shape and a square shape. 2 and 3, the composite material for shielding a magnetic field of a wireless power transmission antenna coil according to another embodiment of the present invention may be formed into a stepped shape with a predetermined height. As shown in FIGS. 2 and 3, when the composite material for shielding a magnetic field having a predetermined height is joined to the power receiving unit (Rx) antenna coil and / or the power transmitting unit (Tx) antenna coil of the wireless charging module And the magnetic field induced by the antenna coil of the power receiving unit (or the power transmitting unit) is collected by the power transmitting unit (or the power receiving unit) without loss, thereby minimizing the leakage magnetic field.
Hereinafter, examples and experimental examples of the present invention will be described.
In order to have characteristics suitable for the wireless charging module as described above, it is desirable that the real magnetic permeability is high and the imaginary part magnetic permeability is low in the frequency band of 100 to 200 kHz, and the shape of the soft magnetic metal powder having such characteristics The following experiments were conducted.
[Example 1]
1. Flattening of soft magnetic metal powder
Sendust (Fe-Si-Al) powder was used as a starting material for manufacturing magnetic field shielding materials. The sent dust powder was milled using an induction milling device to obtain a sprue dust powder. The attrition milling process was performed by a wet process using toluene as a dispersing agent. After the milling process was completed, the solvent used in the nitrogen atmosphere was completely removed to obtain a smoothed sendust powder.
The particle size and distribution of the classified dust particles were analyzed using a light scattering particle size analyzer to find that the average particle size (D50), effective particle size (D10) and effective particle size (D90) were 35 탆, 10 탆 and 75 탆, respectively .
2. Fabrication of composite materials for magnetic shielding
The digitized powder of the dispersed phase and urethane resin were mixed using a turbomixer, tape-cast using a doctor blade method, thermocompression-bonded at a temperature of 100 ° C to produce a magnetic material shielding composite material having a thickness of 0.5 mm Respectively.
[Example 2]
1. Flattening of soft magnetic metal powder
The same sent dust powder as in Example 1 was milled using an attrition milling apparatus to obtain a flattened sensor dust powder.
The average particle diameter (D50), effective particle diameter (D10), and effective particle diameter (D90) of the flaky solid dust powder prepared in Example 2 were 58 탆, 23 탆 and 104 탆, respectively.
2. Fabrication of composite materials for magnetic shielding
A composite material for shielding magnetic fields was prepared under the same conditions as in Example 1, except that the ground powder dispersed according to Example 2 was used.
[Example 3]
1. Flattening of soft magnetic metal powder
The same sent dust powder as in Example 1 was milled using an attrition milling apparatus to obtain a flattened sensor dust powder.
The mean particle size (D50), effective particle size (D10), and effective particle size (D90) of the flaky solid dust powder prepared in Example 3 were 68 탆, 30 탆 and 115 탆, respectively.
2. Fabrication of composite materials for magnetic shielding
A composite material for shielding magnetic fields was prepared under the same conditions as in Example 1, except that the ground powder synthesized according to Example 3 was used.
[Comparative Example 1]
1. Flattening of soft magnetic metal powder
The same sent dust powder as in Example 1 was milled using an attrition milling apparatus to obtain a flattened sensor dust powder.
The average particle diameter (D50), effective particle diameter (D10), and effective particle diameter (D90) of the flaky solid dust powder prepared in Comparative Example 1 were 90 탆, 45 탆 and 150 탆, respectively.
2. Fabrication of composite materials for magnetic shielding
A composite material for magnetic field shielding was prepared under the same conditions as in Example 1, except that the ground powder synthesized according to Comparative Example 1 was used.
[Experimental Example 1]
The magnetic permeability and density of the composite material for shielding magnetic fields according to the average particle size and bulk density of the flaky soft metal powder were measured and the formability was evaluated. The results are shown in Table 1.
The permeability of the composite material was measured using an impedance analyzer (HP 4294A) in the frequency band of 10 kHz to 100 MHz, and the permeability values shown in Table 1 are the real magnetic permeability and the imaginary magnetic permeability at 200 kHz.
The formability of the material was visually judged whether the shape of the composite material after molding was consistent with the design value, whether cracks were generated in the material, and the surface state.
division
Example 1
Example 2
Example 3
Comparative Example 1
Particle size
D10 [占 퐉]
10
23
30
45
D50 [占 퐉]
35
58
68
90
D90 [占 퐉]
75
104
115
150
Apparent density [g / cc]
0.9 - 1.3
0.6 - 1.0
0.3 - 0.7
0.2 - 0.4
The real magnetic permeability (μ ')
70
100
130
130
Implied magnetic permeability (μ '')
2.1
2.5
3.5
2.7
Sheet density [g / cc]
4.3
4.1
3.9
3.5
Formability
Good
Good
Good
Poor
Referring to Table 1, it can be seen that the composite material of Example 3 had a high real magnetic permeability, a low imaginary magnetic permeability, and good moldability. On the other hand, the composite material according to Comparative Example 1 has a high real magnetic permeability and a low imaginary magnetic permeability, but has poor moldability.
The results are as follows. In the case of the flaky powder according to Comparative Example 1, since the average particle diameter (D50) of the flaky powder according to Comparative Example 1 was larger than that of Examples 1 to 3, scratches were generated on the sheet by the coarse powder under the same conditions, It can be judged that this is not good.
When the results of Table 1 are summarized, the shape of the soft magnetic metal powder having permeability characteristics suitable for the frequency band of 100 to 200 kHz has an average particle size (D50) of 40 to 80 mu m, more preferably 55 to 80 mu m , And an apparent density of 0.3 to 0.7 g / cc.
In the following Examples and Experimental Examples, a composite material for shielding magnetic fields was manufactured using a uniformly dispersed dust powder having a particle size (D50) of 67 mu m and an apparent density of 0.5 g / cc, The permeability was analyzed. (SEM photographs of the bouillon solid dust powder applied in the following examples are shown in Fig. 4).
[Example 4]
90 wt% of flaky dust dust and 10 wt% of phenolic resin in a solid phase were mixed using a turbomixer and then a pressing force of 1 ton / cm 2 was applied at 170 ° C for 5 minutes to obtain a ring having an outer diameter of 18 mm, an inner diameter of 12 mm, Shaped composite material.
[Example 5]
A composite material was prepared under the same conditions as in Example 4, except that 92.5 wt% of the particulate send dust powder and 7.5 wt% of phenolic resin were mixed.
[Example 6]
A composite material was prepared under the same conditions as in Example 4, except that 95 wt% of the particulate send dust powder and 5 wt% of phenolic resin were mixed.
[Comparative Example 2]
A composite material was produced under the same conditions as in Example 4, except that 97.5 wt% of the sprue dust powder and 2.5 wt% of the phenolic resin were mixed.
[Experimental Example 2]
In order to analyze the permeability of the composite material according to the content of the sendust powder, the permeability of the composite materials of Examples 4 to 6 and Comparative Example 2 was measured at 10 kHz to 100 MHz Frequency band, using an impedance analyzer (HP 4294A), and the results are shown in Table 2. (The permeability in Table 2 represents the permeability at 200 kHz.)
The formability of the material was visually judged whether or not the shape of the composite material after molding was in agreement with the design value, the occurrence of cracks, and the surface state.
division
Example 4
Example 5
Example 6
Comparative Example 2
Flakes content [wt%]
90
92.5
95
97.5
The real magnetic permeability (μ ')
68.63
80.55
89.19
89.48
Implied magnetic permeability (μ '')
2.03
2.65
2.76
2.92
Q factor (μ '/ μ'')
33.80
30.40
32.31
30.64
Formability
Good
Good
Good
Poor
(Q factor has a reciprocal relationship with the loss factor tan δ represented by μ '' / μ ', which means that the loss of permeability decreases as the Q factor increases.)
Referring to Table 2, it can be seen that as the content of the soft magnetic metal powder increases, both the real magnetic permeability and the imaginary magnetic permeability increase. However, from the results of the formability evaluation of Comparative Example 2, when the content of the spunbond sentust powder was more than 95 wt%, the content of the binder was relatively small and it was not easy to form into the desired shape.
When the results of Experimental Example 2 are combined, it may be preferable to include the flat soft magnetic metal powder of 85 to 97 wt% in order to secure the magnetic permeability and moldability of the composite material, more preferably, the flat soft magnetic metal powder May be contained in a proportion of 90 to 95 wt%.
In order to analyze the magnetic permeability characteristics of composite materials with hot pressurization of a mixture of elastomer powders and binder resin, composites were prepared under the following conditions and permeability was measured.
[Example 7]
Composite materials were prepared in the same ring form as in Example 4 by mixing 95 wt% of the sprue dust powder and 5 wt% of a solid phenolic resin and applying a pressing force of 1 ton / cm 2 at 170 캜 for 2 minutes.
[Example 8]
A composite material was prepared under the same conditions as in Example 7, except that the pressing force was applied for 5 minutes.
[Example 9]
A composite material was prepared under the same conditions as in Example 7, except that the pressing force was applied for 10 minutes.
[Example 10]
A composite material was prepared under the same conditions as in Example 7, except that the pressing force was applied for 20 minutes.
[Comparative Example 3]
A composite material was prepared under the same conditions as in Example 7, except that the pressing force was applied for 35 minutes.
[Experimental Example 3]
The permeability of the composite materials of Examples 7 to 10 and Comparative Example 3 was measured using an impedance analyzer (HP 4294A) in the frequency band of 10 kHz to 100 MHz to investigate the change of permeability of the material according to the hot press- . The results are shown in Table 3. (The permeability in Table 3 represents the permeability at 200 kHz.)
division
Example 7
Example 8
Example 9
Example 10
Comparative Example 3
Pressing time [min]
2
5
10
20
35
The real magnetic permeability (μ ')
85.35
89.19
90.23
90.15
84.79
Implied magnetic permeability (μ '')
2.03
2.76
2.82
2.85
2.97
Q factor (μ '/ μ'')
42.04
32.32
32.00
31.63
28.55
Referring to Table 3, the soft magnetic bond materials produced under the same conditions except that the pressing time was varied from 2 to 35 showed a tendency that the real permeability and the imaginary permeability increased with increasing pressing time , And if it exceeds the predetermined time, the permeability decreases. It was confirmed that the magnetic permeability characteristics of Examples 8 and 9 with the pressurization times of 5 minutes and 10 minutes were the best, respectively. The soft magnetic bond material of Comparative Example 3 produced by pressurizing for 35 minutes had low magnetic permeability It can be confirmed that the negative magnetic permeability is high.
In the forming step, residual stress is applied to the sliced soft magnetic metal powder while molding is performed by plastic deformation of the sliced soft magnetic metal powder due to external heat and pressure, and the residual stress inhibits anisotropy of the magnetic particles from being increased The permeability can be lowered. That is, in the case of Comparative Example 3, as the pressing time is longer than that in Examples 7 to 10, the residual stress existing in the soft magnetic bond material is increased and it can be judged that the magnetic permeability value is low.
Therefore, the pressing time of the slaked soft magnetic metal powder and the binder mixture may be preferably from 2 to 30 minutes, and when the mass productivity is considered together, the pressing time may be more preferably from 5 to 20 minutes.
In order to analyze the magnetic permeability characteristics of the soft magnetic bond material according to the temperature at which the mixture of the flaky dust powder and the binder resin was hot pressed, composite materials were prepared and the permeability was measured under the following conditions.
[Example 11]
Composite materials were prepared in the same ring form as in Example 4 by mixing 95 wt% of the sprue dust powder and 5 wt% of a solid phase phenol resin and applying a pressing force of 1 ton / cm 2 at 160 캜 for 5 minutes.
[Example 12]
A composite material was produced under the same conditions as in Example 11, except that the temperature of the mixture was changed to 180 ° C during hot pressing.
[Comparative Example 4]
A composite material was produced under the same conditions as in Example 11, except that the temperature was changed to 140 ° C during the hot pressing of the mixture.
[Comparative Example 5]
A composite material was prepared under the same conditions as in Example 11, except that the temperature was set to 200 ° C during the hot pressing of the mixture.
[Experimental Example 4]
The permeability of the composite material prepared according to the above Examples and Comparative Examples was measured using an impedance analyzer (HP 4294A) in the frequency band of 10 kHz to 100 MHz, and the results thereof are shown in Table 4. (The permeability in Table 4 represents the permeability at 200 kHz.)
division
Comparative Example 4
Example 11
Example 12
Comparative Example 5
Molding temperature [캜]
140
160
180
200
The real magnetic permeability (μ ')
83.35
87.15
90.23
87.35
Implied magnetic permeability (μ '')
2.01
2.72
2.82
2.95
Q factor (μ '/ μ'')
41.47
32.04
32.00
29.61
Referring to Table 4, among the composite materials produced under the same conditions except for the molding temperature, the permeability of Examples 11 and 12, which were manufactured at a molding temperature of 160 ° C and a molding temperature of 180 ° C, exhibited the best characteristics . Continuing with Table 4, it can be seen that as the forming temperature increases from 140 ° C to 200 ° C, the imaginary permeability tends to increase continuously, while the real permeability increases and decreases from 180 ° C to 200 ° C .
Therefore, it is preferable that the forming temperature is not higher than 190 캜 when hot pressing the soft magnetic metal powder and the binder mixture, and if the temperature is low, the hardening time of the binder becomes long and the working time becomes long It may be desirable to perform the molding process at a temperature of 150 DEG C or higher.
The following experiments were carried out to analyze the density and permeability characteristics of the material produced according to the pressure applied to the mixture during the hot press forming of the mixture of the flaky dust powder and the binder resin.
[Example 13]
Composite materials were prepared in the same ring form as in Example 4 by mixing 95 wt% of the sprue dust powder and 5 wt% of a solid phase phenol resin and applying a pressing force of 1 ton / cm 2 at 170 캜 for 5 minutes.
[Example 14]
A composite material was prepared under the same conditions as in Example 13, except that a pressing force of 1.7 ton / cm < 2 > was applied to the mixture of the flaky dust powder and the phenolic resin under hot pressing.
[Example 15]
A composite material was prepared under the same conditions as in Example 13, except that a pressing force of 2.5 ton / cm < 2 > was applied to the mixture of the flaky dust powder and the phenolic resin under hot pressing.
[Example 16]
A composite material was prepared under the same conditions as in Example 13 except that a pressing force of 3 ton / cm < 2 > was applied during hot pressing of the mixture of the flaky dust powder and the phenolic resin.
[Comparative Example 6]
A composite material was prepared under the same conditions as in Example 13 except that a pressing force of 0.5 ton / cm < 2 > was applied during hot pressing of the mixture of the flaky dust powder and the phenolic resin.
[Experimental Example 5]
The permeability of the composite material prepared according to Comparative Example 6 and Examples 13 to 16 was measured using an impedance analyzer (HP 4294A) in the frequency band of 10 kHz to 100 MHz, and the results are shown in Table 5 . (The permeability in Table 5 represents the permeability at 200 kHz.)
division
Comparative Example 6
Example 13
Example 14
Example 15
Example 16
Pressing force [ton / cm 2 ]
0.5
One
1.7
2.5
3
Magnetic material density [g / cc]
3.9
4.4
4.8
5.2
5.4
The real magnetic permeability (μ ')
87.65
89.19
136.41
152.34
135.23
Implied magnetic permeability (μ '')
2.51
2.76
3.91
4.23
3.95
Q factor (μ '/ μ'')
34.92
32.32
34.89
36.01
34.24
Referring to Table 5, the magnitude of the pressing force can see that indicates a tendency to decrease with increase in 0.5ton / cm 2 to 3ton / cm 2, to check that the increase in density of the material, while increasing the real part permeability have.
The soft magnetic bond materials of Examples 13 and 16 produced by applying a pressing force in the range of 1 to 3ton / cm 2 had good density and real magnetic permeability, and in particular, the soft magnetic bond materials of Examples 15 and 16 It can be confirmed that the density has a real magnetic permeability value of at least 5 g / cc.
Also, in Example 16 in which the highest pressure is applied, it can be seen that the density is the highest value, while the permeability is lower than in Examples 14 and 15. [ These results indicate that the density of the material is increased by increasing the orientation of the soft magnetic metal powder as the pressing force is higher than those of Examples 13 to 15 and the real magnetic permeability is decreased by the increase of the residual stress due to the excessive pressure can do.
Therefore, when the mixture of the soft magnetic metal powder and the binder is hot-pressed, the pressure applied to the mixture may preferably be 1 to 3 ton / cm 2 .
In order to analyze the magnetic permeability characteristics of the composite material with and without the insulation treatment of the soft magnetic metal powder, composite materials were prepared and the permeability was measured as follows.
[Example 17]
The flaky dust dust was mixed with an insulating coating solution containing 2% by weight of a silane-based coupling agent and stirred for 30 minutes. After the stirring, the heat treatment was completed by evaporating all the solvent. 90% by weight of the heat-treated insulated powder and 10% by weight of a solid phenolic resin were mixed, and then a pressing force of 1.7 ton / cm 2 was applied for 5 minutes at a density of 5.15 to 5.25 g / .
[Example 18]
90% by weight of a spunbond sentust powder having an average particle diameter (D50) of 67 占 퐉 and an apparent density of 0.5 g / cc and 10% by weight of a solid phenol resin were mixed and then melted at 170 占 폚 to have a density of 5.15 to 5.25 g / / cm < 2 > for 5 minutes to prepare a composite material.
[Example 19]
A composite material was prepared under the same conditions as in Example 17, except that 95 wt% of the heat-treated insulated powder and 5 wt% of a solid phenolic resin were mixed.
[Example 20]
A composite material was produced under the same conditions as in Example 18, except that 95 wt% of the particulate send dust powder and 5 wt% of a solid phase phenol resin were mixed.
[Experimental Example 6]
The permeability of the composite material prepared according to Examples 17 to 20 was measured using an impedance analyzer (HP 4294A) in the frequency band of 10 kHz to 100 MHz, and the results are shown in Table 6. Is the permeability at 200 kHz.)
division
Example 17
Example 18
Example 19
Example 20
Powder content [wt%]
90
90
95
95
Isolation treatment
U
radish
U
radish
Magnetic material density [g / cc]
5.17
5.18
5.21
5.19
The real magnetic permeability (μ ')
116.5
132.67
132.30
152.13
Implied magnetic permeability (μ '')
3.26
3.91
3.31
4.12
Q factor (μ '/ μ'')
35.73
33.93
39.9
36.92
Referring to Table 6, it can be seen that in Example 17, the real permeability of the composite material of Example 18 in which the insulating layer is not formed is somewhat low, but the quality factor (Q factor) is high. It can be seen that although the real permeability of the composite material of Example 20 in which the insulating layer is not formed is somewhat low, the quality factor is high.
This result can be attributed to the fact that the electrical resistance of the material is increased by coating an insulating material on the surface of the soft magnetic metal powder and the eddy current loss is reduced thereby reducing the imaginary part permeability, which is the loss component of the magnetic permeability.
Also, with continued reference to Table 6, it can be seen that, even when a composite material is manufactured by further including an insulation treatment step, the density and the real permeability of the material can be increased to be equal to or higher than those of the prior art, .
It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.
Claims (10)
i) a smoothing step of smoothing the soft magnetic metal powder so as to have a predetermined shape;
ii) preparing a mixture of 85 to 97% by weight of the flaky soft magnetic metal powder obtained in the sizing step and 3 to 15% by weight of the thermosetting binder in a predetermined ratio;
iii) a molding step of subjecting the mixture obtained in the step of preparing the mixture to hot compression molding so as to have a predetermined shape; , ≪ / RTI >
Wherein the soft magnetic composite material produced by the above step has a density of 4.4 to 5.4 g / cc and an actual magnetic permeability of 60 to 150 in a frequency band of 100 to 200 kHz. (EN) METHOD FOR MANUFACTURING COMPOSITE MATERIAL.
The particles of the flat-surfaced soft-magnetic metal powder,
And the average particle diameter (D50) is 40 to 80 占 퐉.
The particles of the flat-surfaced soft-magnetic metal powder,
Wherein the soft magnetic composite material has an apparent density of 0.3 to 0.7 g / cc and an aspect ratio of 10 to 60.
Between the kneading step and the forming step,
And forming an insulating layer on the surface of the particles of the soft magnetic metal powder.
The forming step comprises:
Wherein the annealing is performed at a temperature of 150 to 190 ° C.
Wherein the thermosetting binder is a solid phase powder. 2. The method of claim 1, wherein the thermosetting binder is a solid phase powder.
The forming step comprises:
Wherein the soft magnetic composite material is manufactured by hot pressing the mixture of the flat soft magnetic metal powder and the thermosetting binder for 2 to 30 minutes to form a predetermined shape. Method of manufacturing a material.
The soft magnetic metal powder in the smoothing step may be Fe-Si-Al alloy powder, Fe-Ni alloy powder and Ni-Fe-Mo alloy powder, Fe-Si alloy powder, Fe- Alloy powder, an Fe-Al alloy powder, and an Fe-Cr alloy powder. 2. A method of manufacturing a magnetic composite material for magnetic field shielding in a wireless power transmission device, comprising:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024144143A1 (en) * | 2022-12-27 | 2024-07-04 | 주식회사 아모센스 | Shielding member made of polymer material and wireless power reception module comprising same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007295558A (en) | 2006-03-31 | 2007-11-08 | Nitta Ind Corp | Antenna transmission improving sheet body and electronic apparatus |
| JP2013253122A (en) | 2011-04-25 | 2013-12-19 | Sumitomo Osaka Cement Co Ltd | Composite magnetic material, method for manufacturing the same, antenna, and communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007295558A (en) | 2006-03-31 | 2007-11-08 | Nitta Ind Corp | Antenna transmission improving sheet body and electronic apparatus |
| JP2013253122A (en) | 2011-04-25 | 2013-12-19 | Sumitomo Osaka Cement Co Ltd | Composite magnetic material, method for manufacturing the same, antenna, and communication device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024144143A1 (en) * | 2022-12-27 | 2024-07-04 | 주식회사 아모센스 | Shielding member made of polymer material and wireless power reception module comprising same |
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