WO2006077957A1 - 軟磁性材料および圧粉磁心 - Google Patents
軟磁性材料および圧粉磁心 Download PDFInfo
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- WO2006077957A1 WO2006077957A1 PCT/JP2006/300826 JP2006300826W WO2006077957A1 WO 2006077957 A1 WO2006077957 A1 WO 2006077957A1 JP 2006300826 W JP2006300826 W JP 2006300826W WO 2006077957 A1 WO2006077957 A1 WO 2006077957A1
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- soft magnetic
- magnetic material
- insulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/08—Cores, Yokes, or armatures made from powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
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- 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
- H01F1/24—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 the particles being insulated
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- 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
- H01F1/24—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 the particles being insulated
- H01F1/26—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 the particles being insulated by macromolecular organic substances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
- Y10T428/2995—Silane, siloxane or silicone coating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2998—Coated including synthetic resin or polymer
Definitions
- the present invention relates to a soft magnetic material and a dust core, and more specifically, a soft magnetic material and a compact that have good moldability and can sufficiently suppress iron loss by causing an insulating coating to function well. Concerning powder magnetic core.
- hysteresis loss is proportional to the square of the operating frequency. For this reason, hysteresis loss is dominant in the operating frequency band of several hundred Hz or less, and it can be said that the use of electrical steel sheet material with particularly low hysteresis loss is effective in this frequency band.
- the power effectively used in this case is a dust core or soft ferrite core that exhibits relatively good low eddy current loss characteristics.
- the dust core is manufactured using a powdered soft magnetic material typified by iron, an iron-cadium alloy, a sendust alloy, a permalloy alloy, and an iron-based amorphous alloy. More specifically, this soft magnetic material is mixed with a binder member having excellent insulating properties, or the surface of the powder is insulated. It is produced by pressure-molding a treated material.
- soft ferrite cores are known as particularly excellent low eddy current loss materials because the materials themselves have high electrical resistance.
- a dust core is advantageous because a soft magnetic material having a high saturation magnetic flux density is used as a main component.
- a force that is effective as a process for removing distortion is a thermal annealing process performed on a molded body. If the temperature at the time of this heat treatment is set high, the effect of strain relief becomes large and the hysteresis loss can be reduced. However, if the temperature during heat treatment is set too high, the insulating binder member constituting the soft magnetic material may be decomposed or deteriorated, resulting in increased eddy current loss. Therefore, the heat treatment cannot be performed in the V and temperature range where such problems do not occur, and the insulating binder member constituting the soft magnetic material can improve the heat resistance of the insulating coating. However, this is an important issue in reducing the iron loss of the dust core.
- a resin member having a phosphate coating as an insulating coating is added to a pure iron powder having a mass of 0.05% to 0.5% by mass. Some of them are manufactured by heat forming and then heat annealing to remove strain. In this case, the temperature during the heat treatment is about 200 ° C to 500 ° C, which is the thermal decomposition temperature of the insulating coating. In this case, however, it is not possible to obtain a sufficient effect of removing the distortion due to the low temperature during the heat treatment.
- Patent Document 1 JP 2003-303711 A discloses an iron-based powder having a heat-resistant insulating film and a heat-resistant insulating film that does not break insulation during annealing to reduce hysteresis loss.
- a powder magnetic core using the above is disclosed!
- the surface of the powder containing iron as a main component is a film containing silicone resin and pigment. Covered. More preferably, a coating containing a substance such as a silicone compound is provided as the lower layer of the coating containing the silicone resin and pigment.
- the pigment is preferably a powder having an average particle size force Onm or less defined as D50.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-303711
- the heat-resistant insulating coating disclosed in Patent Document 1 contains a pigment. Pigments are usually made of hard materials such as metal oxides. For this reason, when pressure-molding the iron-based powder of Patent Document 1 to produce a powder magnetic core, the heat-resistant insulating coating is locally damaged by the pressure of pressure molding. As a result, the heat resistance of the insulating coating is improved, but the electrical resistance itself is reduced, and eddy current flows between the iron-based powders, and the iron loss of the dust core due to eddy current loss increases immediately. Occurs. In other words, although the pigment has an effect of improving heat resistance, there is some damage to the heat-resistant insulating film during pressure molding, so that basic vortex loss below the heat-resistant temperature increases.
- an object of the present invention is to solve the above-mentioned problems, and a soft magnetic material and a powder compact that have good moldability and can sufficiently suppress iron loss by causing an insulating coating to function well. It is to provide a magnetic core.
- the soft magnetic material in one aspect of the present invention is a soft magnetic material including a plurality of composite magnetic particles, and each of the plurality of composite magnetic particles includes a metal magnetic particle and a surface of the metal magnetic particle. And a composite coating surrounding the outside of the insulating coating.
- the composite film has a heat resistance imparting protective film surrounding the surface of the insulating film and a flexible protective film surrounding the surface of the heat resistance imparting protective film.
- a soft magnetic material is a soft magnetic material including a plurality of composite magnetic particles, and each of the plurality of composite magnetic particles includes a metal magnetic particle and a surface of the metal magnetic particle. And a composite film that surrounds the surface of the insulating film.
- the composite coating is a mixed coating of a heat-resistant protective coating and a flexible protective coating, and the surface of the composite coating contains more flexible protective coatings than the heat-resistant protective coating, and Absolute The composite coating at the border with the edge coating contains more heat-resistant protective coating than flexible protective coating.
- the surface of the composite magnetic particle is covered with the flexible protective film having a predetermined flexibility, so that the moldability is good. become.
- the flexible protective film has a property of creaking, it is difficult for cracks to enter the flexible protective film even under pressure. Therefore, it is possible to prevent the heat resistant protective coating and the insulating coating from being destroyed by the pressure of the pressure molding by the flexible protective coating. Therefore, the eddy current flowing between the particles can be sufficiently suppressed by causing the insulating coating to function well.
- the heat-resistance-imparting protective film since the insulating film is protected by the heat-resistance-imparting protective film, the heat resistance of the insulating film is improved, and the insulating film is broken even when heat-treated at a high temperature. Therefore, hysteresis loss can be reduced by high-temperature heat treatment.
- the insulating coating contains at least one selected from the group consisting of a phosphorus compound, a key compound, a zirconium compound, and an aluminum compound.
- the average thickness of the insulating coating is not less than lOnm and not more than 1 ⁇ m.
- the tunnel current flowing in the insulating film can be suppressed, and an increase in eddy current loss due to the tunnel current can be suppressed.
- the average thickness of the insulating coating is 1 ⁇ m or less, the distance between the metal magnetic particles becomes too large and a demagnetizing field is generated (magnetic poles are generated in the metal magnetic particles, resulting in energy loss). Can be prevented. As a result, an increase in hysteresis loss due to the generation of the demagnetizing field can be suppressed.
- the volume ratio force of the insulating coating in the soft magnetic material can be prevented from becoming too small, and the saturation magnetic flux density of the molded body of the soft magnetic material can be prevented from decreasing.
- the heat-resistant protective coating contains an organic silicon compound, and the siloxane crosslinking density of the organic silicon compound is greater than 0. 1.5 It is as follows.
- Organosilicon compounds having a siloxane crosslink density of greater than 0 and less than or equal to 1.5 have a high Si content even after pyrolysis, in addition to excellent heat resistance of the compound itself.
- the shrinkage when changed to a compound is small and there is no sudden drop in electrical resistance, making it suitable as a heat-resistant protective coating.
- the siloxane crosslinking density (RZSi) l More preferably, the siloxane crosslinking density (RZSi) l.
- the flexible protective coating contains a silicone resin, and the amount of Si (silicon) contained in the composite coating at the boundary with the insulating coating is More than the amount of Si contained in the surface of the composite coating!
- the amount of Si in the heat-resistance-imparting protective coating is greater than the content of Si in the flexible protective coating. For this reason, in the composite coating, the flexible protective coating is unevenly distributed on the surface. Thereby, it is possible to prevent the heat-resistant imparting protective coating and the insulating coating from being destroyed by the pressure of pressure molding by the flexible protective coating. Therefore, the eddy current flowing between the particles can be sufficiently suppressed by causing the insulating film to function well.
- the flexible protective film is at least one selected from the group consisting of silicone resin, epoxy resin, phenol resin, and amide resin. Contains seeds.
- the average thickness of the composite coating is not less than lOnm and not more than 1 ⁇ m.
- the average thickness of the composite coating is lOnm or more, the breakdown of the insulating coating can be effectively suppressed.
- the average thickness of the composite coating is 1 m or less, the distance between the metal magnetic particles becomes too large, and a demagnetizing field is generated (a magnetic pole is generated in the metal magnetic particles and energy loss is generated). ) Can be prevented. As a result, an increase in hysteresis loss due to generation of a demagnetizing field can be suppressed. Further, it is possible to prevent the saturation magnetic flux density of the molded body of the soft magnetic material from being lowered due to the volume ratio force of the composite coating occupying the soft magnetic material being too small.
- the dust core of the present invention is manufactured using any one of the above soft magnetic materials! RU This As a result, it is possible to obtain a dust core having a high molding density and capable of satisfactorily suppressing iron loss by causing the insulating coating to function well.
- the amount of Si contained in the composite coating at the boundary with the insulating coating is greater than the amount of Si contained in the surface of the composite coating.
- the flexible protective coating is unevenly distributed on the surface.
- the moldability is good, and the insulating film can function well to sufficiently suppress the iron loss.
- FIG. 1A is an enlarged schematic diagram showing a dust core according to Embodiment 1 of the present invention.
- FIG. 1B is an enlarged view showing one composite magnetic particle in FIG. 1A.
- FIG. 2 is a diagram showing the relationship between the siloxane crosslink density (RZSi) of an organic silicon compound (silicone resin) and the thermal crack resistance and flexibility.
- FIG. 3 is a diagram showing the Si content along line III-III in the composite coating of the composite magnetic particle in FIG. 1B.
- FIG. 4A is an enlarged schematic diagram showing a dust core according to Embodiment 2 of the present invention.
- FIG. 4B is an enlarged view showing one composite magnetic particle in FIG. 4A.
- FIG. 5 is a diagram showing the Si content along the VV line in the composite coating of the composite magnetic particles in FIG. 4B.
- FIG. 6 is a graph showing the relationship between the surface pressure during pressure molding and the density of the molded body in Example 1 of the present invention.
- FIG. 7 is a graph showing the relationship between annealing temperature and iron loss in Example 2 of the present invention. Explanation of symbols
- FIG. 1A is an enlarged schematic diagram showing a dust core according to Embodiment 1 of the present invention.
- FIG. 1B is an enlarged view showing one composite magnetic particle in FIG. 1A.
- the soft magnetic material of the present embodiment includes a plurality of composite magnetic particles 30.
- Each of the plurality of composite magnetic particles 30 is bonded to each other by, for example, a combination of unevenness of the composite magnetic particles 30, or is bonded by an organic substance (not shown) existing between the plurality of composite magnetic particles 30.
- the composite magnetic particle 30 has a metal magnetic particle 10, an insulating coating 20, and a composite coating 22.
- An insulating coating 20 is formed so as to surround the surface of the metal magnetic particles 10, and a composite coating 22 is formed so as to surround the surface of the insulating coating 20.
- the metal magnetic particles 10 are made of a material having a high saturation magnetic flux density and a low coercive force as magnetic properties, such as iron (Fe), iron (Fe) silicon (Si) based alloys, Iron (Fe) —Almium (A1) alloy, Iron (Fe) —Chromium (Cr) alloy (such as electromagnetic stainless steel), Iron (Fe)-Nitrogen (N) alloy, Iron (Fe) Nickel (Ni) alloys (permalloy, etc.), iron (Fe) —carbon (C) alloys, iron (Fe) boron (B) alloys, iron (Fe) cobalt (Co) alloys, iron (Fe) —phosphorus (P) alloys, iron (Fe) -nickel (Ni) -cobalt (Co) alloys, iron (Fe) -aluminum (A1) -silicon (Si) alloys (Sendust, etc.), and the like can be used.
- pure iron particles iron-caine (over 0 to 6.5% by mass) alloy particles, iron alloy (over 0 to 5% by mass) alloy particles, permalloy alloy particles, electromagnetic It is preferable to use stainless steel alloy particles, sendust alloy particles and iron-based amorphous alloy particles as metal magnetic particles10.
- the average particle size of the metal magnetic particles 10 is preferably 5 ⁇ m or more and 300 ⁇ m or less! /.
- the average particle diameter of the metal magnetic particles 10 is 5 m or more, the magnetic properties of the dust core can be improved because the metal magnetic particles 10 are hardly oxidized.
- the average particle size of the metal magnetic particles 10 is set to 300 m or less, the compressibility of the powder does not deteriorate during pressure molding. This increases the density of the compact obtained by pressure molding. Togashi.
- the average particle size referred to here is the particle size of particles whose sum of mass from the smallest particle size reaches 50% of the total mass in the histogram of particle size measured by laser scattering diffraction method. That is, 50% particle size D.
- the insulating coating 20 is formed of a material having at least electrical insulation, for example, a phosphorus compound, a key compound, a zirconium compound, or an aluminum compound.
- a material having at least electrical insulation for example, a phosphorus compound, a key compound, a zirconium compound, or an aluminum compound.
- examples of such materials include iron phosphate containing phosphorus and iron, mangan phosphate, dumbbell phosphate, calcium phosphate, silicon oxide, titanium oxide, acid aluminum, or acid zirconium. Can be mentioned.
- the insulating coating 20 functions as an insulating layer between the metal magnetic particles 10.
- the electrical resistivity p of the dust core can be increased. Thereby, it is possible to suppress the eddy current from flowing between the metal magnetic particles 10 and to reduce the iron loss of the dust core caused by the eddy current loss.
- a wet coating treatment is performed using a solution obtained by dissolving a metal phosphate and a phosphate in water or an organic solvent.
- the method of implementing is mentioned.
- the insulating film 20 made of a key compound on the metal magnetic particles 10 may be formed by wet coating with a key compound such as a silane coupling agent, silicone resin, or silazane, or by a sol-gel method. Examples of the method include coating a glass with lath and silicon oxide.
- Examples of a method for forming the insulating coating 20 having a zirconium compound force on the metal magnetic particles 10 include a wet coating treatment with a zirconium coupling agent and a coating method with zirconium oxide by a sol-gel method.
- Examples of the method for forming the insulating coating 20 having an aluminum compound force on the metal magnetic particles 10 include a method of coating acid aluminum by a sol-gel method. Note that the method for forming the insulating coating 20 is not limited to the method described above, and various methods suitable for the insulating coating 20 to be formed can be adopted.
- the average thickness of the insulating coating 20 is preferably lOnm or more and 1 ⁇ m or less. In this case, the eddy current loss is prevented from increasing due to the tunnel current, and the metal magnetic particles are It is possible to prevent an increase in hysteresis loss due to the demagnetizing field generated between the elements 10.
- the average thickness of the lower layer coating 20 is more preferably 500 nm or less, and even more preferably 200 nm or less.
- the average thickness referred to here is the film thickness obtained by compositional analysis (TEM—EDX: transmission electron microscope energy dispersive X-ray spectroscopy), and the equilibrium thickness measurement (JCP). — Considering the amount of elements obtained by Ms: inductively coupled plasma-mass spectrom etry), the equivalent thickness is derived, and further, the film is directly observed by TEM photograph, and the order of equivalent thickness previously derived is determined. Say what is determined by checking.
- the composite coating 22 has a heat resistance imparting protective coating 24 and a flexible protective coating 26.
- the heat resistance imparting protective coating 24 is formed so as to surround the surface of the insulating coating 20, and the flexible protective coating 26 is formed so as to surround the surface of the heat resistance imparting protective coating 24. That is, the composite coating 22 of the present embodiment has a two-layer structure, and the heat-resistance-imparting protective coating 24 is formed on the interface side with the insulating coating 20, and the composite magnetic particle 30 is flexible on the surface side.
- the protective protective film 26 is formed.
- the average thickness of the composite coating 22 is preferably 10 nm or more and 1 ⁇ m or less. In this case, breakage of the insulating coating 20 can be effectively suppressed and an increase in hysteresis loss due to the demagnetizing field generated between the metal magnetic particles 10 can be prevented.
- the heat-resistance-imparting protective coating 24 serves to prevent the lower insulating coating 20 from being heated and thermally decomposed during heat treatment.
- the heat-resistant protective coating 24 is made of a material containing an organic silicon compound and having a siloxane crosslinking density (RZSi) of greater than 0 and not greater than 1.5.
- RZSi siloxane crosslinking density
- a silicone resin having a siloxane crosslinking density (RZSi) within the above range can be used. More preferably, the siloxane crosslinking density (RZSi) is 1.3 or less.
- the siloxane crosslinking density (RZSi) is a numerical value representing the average number of organic groups bonded to one Si atom, and the smaller the value, the greater the degree of crosslinking. The amount increases.
- the flexible protective coating 26 is formed of the lower heat-resistant protective coating 24 and the insulating layer during pressure molding. It serves to prevent the coating 20 from being destroyed.
- the flexible protective coating 26 is made of a material having a predetermined flexibility. Specifically, when a bendability test specified in JIS (Japanese Industrial Standards) is performed at room temperature using a round bar with a diameter of 6 mm, the coating does not crack and the metal plate strength does not peel off. It becomes more.
- the flexibility test specified in JIS is performed by the following method. Place the specimens in the room for 24 hours for naturally-dried varnishes and then add heat at the specified temperature and time for heat-dried varnishes. After that, let it cool at room temperature, and then 25 test pieces of metal plate. Hold in C water for about 2 minutes, and with the coating on the outside, bend it 180 degrees in about 3 seconds along a round bar with the specified diameter. Then, visually check whether the coating film is cracked and the metal plate is not peeled off.
- the flexible protective coating 26 is made of, for example, a silicone resin having a siloxane crosslinking density (RZSi) greater than 1.5.
- the flexible protective coating 26 may be made of epoxy resin, phenol resin, amide resin, or the like.
- FIG. 2 is a graph showing the relationship between the siloxane crosslink density (RZSi) of an organosilicon compound (silicone resin) and the thermal crack resistance and bendability.
- the heat cracking resistance is a value indicated by the time until cracking occurs when the organosilicon compound is heated to 280 ° C, and the bending radius of bending is 3 mm.
- the thermal crack resistance of the silicone resin is good when the siloxane crosslinking density (RZSi) is 1.5 or less.
- a silicone resin having a siloxane crosslink density (RZSi) of greater than 0 and less than or equal to 1.5 is suitable as the heat resistant protective coating 24. More preferably, the siloxane crosslinking density (RZSi) is 1.3 or less.
- the flexibility of silicone resin has been improved when the siloxane crosslink density (RZSi) exceeds 1.5. This indicates that a silicone resin having a siloxane crosslinking density (R / Si) greater than 1.5 is suitable as the flexible protective coating 26.
- the Si content in the composite coating 22 is as shown in FIG. 1A and FIG. IB.
- FIG. 3 is a diagram showing the Si content along the line III-III in the composite coating of the composite magnetic particles in FIG. 1B.
- the silicone resin grease constituting the flexible protective coating 26 The xanthane crosslinking density (RZSi) is larger than the siloxane crosslinking density (RZSi) of the silicone resin constituting the heat resistance imparting protective coating 24, so the Si content of the heat resistance imparting protective coating 24 is a flexible protective coating. More than 26 Si content.
- the Si content in the composite coating 22 at the boundary with the insulating coating 20 is larger than the Si content on the surface of the composite coating 22 (composite magnetic particle 30).
- the metal magnetic particles 10 having the insulating coating 20 formed in an organic solvent in which the components of the heat resistance imparting protective coating 24 are dissolved examples include a method (wet coating treatment method) in which the organic solvent is evaporated by immersing and stirring, and then the heat-resistant protective coating 24 is cured.
- a wet coating treatment method can be similarly used as a method of forming the flexible protective coating 26 on the surface of the heat-resistance-imparting protective coating 24.
- the insulating coating 20 is formed on the surface of the metal magnetic particle 10
- the heat-resistant imparting protective coating 24 is formed on the surface of the insulating coating 20
- the flexible protective coating 26 is formed on the surface of the heat-resistant imparting protective coating 24.
- the composite magnetic particles 30 are obtained through the above steps.
- the composite magnetic particle 30 is placed in a mold and, for example, press-molded with a pressure of 700 MPa to 1500 MPa. As a result, the composite magnetic particles 30 are compressed to obtain a molded body.
- the atmosphere for pressure molding may be in the air, but is preferably an inert gas atmosphere or a reduced pressure atmosphere. In this case, the composite magnetic particles 40 can be prevented from being oxidized by oxygen in the atmosphere.
- the flexible protective coating 26 has a predetermined flexibility, the moldability of the soft magnetic material is good. In addition, when pressure is applied during pressure molding, the flexible protective coating 26 rubs. For this reason, the flexible protective coating 26 is difficult to crack. Therefore, the flexible protective coating 26 can prevent the heat resistance imparting protective coating 24 and the insulating coating 20 from being broken by the pressure of the pressure forming.
- the atmosphere for heat treatment may be air, but it may be an inert gas atmosphere or Is preferably a reduced pressure atmosphere. In this case, composite magnetic particles by oxygen in the atmosphere
- the heat-resistance-imparting protective coating 24 has high heat resistance! /, And therefore functions as a protective film that protects the insulating coating 20 from heat. For this reason, the insulating film 20 does not deteriorate even though the heat treatment is performed at a high temperature of 500 ° C. or higher. Therefore, hysteresis loss can be reduced by high-temperature heat treatment.
- the powder compact shown in FIG. 1A is completed by applying an appropriate force, such as cutting, to the compact as necessary.
- the flexible protective film 26 having a predetermined flexibility is covered with the surface of the composite magnetic particle 30, so that the moldability is high. Become good. Further, the heat resistant protective coating 24 and the insulating coating 20 can be prevented from being broken by the pressure of the pressure molding due to the property of the flexible protective coating 26. Therefore, the insulating film 20 can function well, and the eddy current flowing between the particles can be sufficiently suppressed.
- the heat resistance of the insulating coating 20 is improved, and the insulating coating 20 is destroyed even when heat-treated at high temperature. Therefore, the hysteresis loss can be reduced by high-temperature heat treatment.
- FIG. 4A is an enlarged schematic diagram showing the dust core in the second embodiment of the present invention.
- FIG. 4B is an enlarged view showing one composite magnetic particle in FIG. 4A.
- the composite coating 22a of the present embodiment is a mixed coating of a heat resistance imparting protective coating and a flexible protective coating. Specifically, for example, a silicone resin particle having a siloxane crosslink density (RZSi) greater than 0 and less than or equal to 1.5, and a silicone resin molecule having a siloxane crosslink density (RZSi) greater than 1.5. It is a mixed composite film.
- RZSi siloxane crosslink density
- the ratio of the flexible protective coating contained in the composite coating 22a increases as the composite coating 22a at the boundary with the insulating coating 20 is directed toward the surface of the composite coating 22a. For this reason, the surface of the composite film 22a contains more flexible protective film than heat resistant protective film. In addition, the composite coating 22a at the boundary with the insulating coating 20 contains more heat-resistant protective coating than the flexible protective coating.
- the Si content in the composite coating 22 is, for example, as shown in FIG.
- FIG. 5 is a diagram showing the Si content along the line VV in the composite coating of the composite magnetic particles in FIG. 4B.
- the siloxane crosslinking density (R / Si) of the flexible protective coating contained in the composite coating 22a is greater than the siloxane crosslinking density (RZSi) of the heat-resistant protective coating contained in the composite coating 22a.
- R / Si siloxane crosslinking density
- RZSi siloxane crosslinking density
- the method for forming the composite coating 22a as described above on the surface of the insulating coating 20 includes, for example, metal magnetic particles in which the insulating coating 20 is formed in an organic solvent in which components of the heat-resistance-imparting protective coating are dissolved.
- a method of evaporating the organic solvent while immersing and stirring 10 and gradually dissolving the components of the flexible protective film in the organic solvent can be mentioned.
- the components of the heat-resistant imparting protective coating first coat the surface of the insulating coating 20, and the proportion of the components of the heat-resistant imparting protective coating decreases in the organic solvent.
- the component of the flexible protective film increases in the organic solvent, and the composite film 22a in which the component of the flexible protective film gradually increases is obtained.
- the soft magnetic material of the present embodiment since a large number of flexible protective films having a predetermined flexibility are present on the surface of the composite magnetic particle 30a, the moldability is improved. In addition, since there are many flexible protective coatings on the surface of the composite magnetic particle 30a, the heat resistance imparting protective coating contained in the composite coating 22a and the insulating coating 20 are destroyed by the pressure of pressure molding. This can be prevented by the heat resistant protective film contained in the composite film 22a. But Thus, the eddy current flowing between the particles can be sufficiently suppressed by causing the insulating coating 20 to function well.
- the insulating coating 20 is protected by the heat-resistant protective coating. As a result, the heat resistance of the insulating coating 20 is improved, and the insulating coating 20 is broken even when heat-treated at a high temperature. Therefore, hysteresis loss can be reduced by high-temperature heat treatment.
- the force shown in the case where the Si content in the composite coating 22a is distributed as shown in Fig. 5 is not limited to such a case.
- the surface of the composite film contains more flexible protective film than the heat-resistant protective film, and the composite film at the boundary with the insulating film has higher heat resistance than the flexible protective film. If more film is included, please.
- Invented product Iron powder (ABC100.30 (manufactured by Heganes)) having a purity of 99.8% or more produced by the atomizing method was prepared as metal magnetic particles 10.
- the insulating coating 20 was formed by phosphorylation treatment.
- a film of low molecular weight silicone resin (XC96-B0446 GE Toshiba Silicone) with a film thickness of 50 nm is formed as a heat resistant protective film 24, and a polymer type silicone resin with a film thickness of 50 nm ( TSR116 GE Toshiba Silicone Co.) was formed as a flexible protective coating 26.
- the heat-resistant protective coating 24 and the flexible protective coating 26 were thermally cured by maintaining in the atmosphere at a temperature of 150 ° C.
- this mixed powder was pressure-molded at a pressure in the range of 7 to 13 t (tons) Zcm 2 (686 to 1275 MPa) to produce a dust core (invention).
- Comparative Example 1 An insulating coating 20 was formed on the surface of the metal magnetic particle 10 using the same method as that of the invention. Next, only a heat-resistant protective film of low molecular weight silicone resin (XC96-B0446 GE manufactured by Toshiba Silicone Co., Ltd.) with a film thickness of lOOnm was formed. Thereafter, a dust core (Comparative Example 1) was produced using the same method as invented product 1. Comparative Example 2: Insulating film 20 was formed on the surface of metal magnetic particle 10 using the same method as that of the invention. Next, only a flexible protective film of polymer type silicone resin (manufactured by TSR116 GE Toshiba Silicone Co.) with a film thickness of lOOnm was formed. Thereafter, a powder magnetic core (Comparative Example 1) was prepared using the same method as invented product V.
- XC96-B0446 GE manufactured by Toshiba Silicone Co., Ltd. XC96-B0446 GE manufactured by Toshiba Silicone Co., Ltd.
- Comparative Example 3 Using the same method as in Comparative Example 1, an insulating coating 20 was formed on the surface of the metal magnetic particle 10. Next, 0.2% by mass of SiO nanoparticles (average particle size 30nm) as pigment is applied to low molecular weight silicone resin (XC96-B0446 GE manufactured by Toshiba Silicone) with a film thickness of lOOnm.
- SiO nanoparticles average particle size 30nm
- low molecular weight silicone resin XC96-B0446 GE manufactured by Toshiba Silicone
- Comparative Example 3 corresponds to the iron-based powder described in Patent Document 1.
- the heat resistance and the iron loss (eddy current and hysteresis loss) of the insulating coating of the soft magnetic material of the present invention were examined.
- the pressure during pressure molding is l ltZcm 2 (10 79 MPa) and using the same method as in Example 1, the inventive product and the dust cores of Comparative Examples 1 to 3 were produced.
- annealing was performed on the dust core (molded body) by changing the temperature in the range of 400 ° C to 800 ° C.
- the iron loss was measured for each dust core.
- the iron loss of the invention is 144 WZkg, whereas the iron loss of Comparative Example 1 is 173 W / kg. Yes, the iron loss of Comparative Example 2 is 155 WZkg, and the iron loss of Comparative Example 3 is 219 WZkg. Also, at other annealing temperatures, the iron loss of the inventive product was smaller than the iron loss of Comparative Examples 1 to 3.
- the value of the iron loss has a minimum value, and the iron loss increases when the annealing temperature exceeds a predetermined temperature. This is thought to be due to the thermal decomposition of the insulating film initiated by the annealing and the eddy current loss increasing.
- the temperature at which the value of the iron loss becomes a minimum value is 700 to 750 ° C in the case of the invention, whereas it is 700 ° C in Comparative Example 1 and 600 ° C in Comparative Example 2. In Comparative Example 3, the temperature was 700 ° C.
- Table 3 shows the performances of the invention products obtained in Examples 1 and 2 and Examples 1-3.
- A means that it is superior
- B means that it is slightly better
- C means that it is slightly inferior
- D is inferior.
- Comparative Example 1 is slightly superior in heat resistance, but the moldability is deteriorated.
- Comparative Example 2 has excellent moldability and poor heat resistance. Further, Comparative Example 3 is slightly superior in heat resistance, but the moldability is deteriorated. In contrast, the inventive product is excellent in both formability and heat resistance.
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Abstract
Description
Claims
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EP06712051.9A EP1840907B1 (en) | 2005-01-20 | 2006-01-20 | Soft magnetic material and dust core |
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JP2005012565A JP4613622B2 (ja) | 2005-01-20 | 2005-01-20 | 軟磁性材料および圧粉磁心 |
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EP (1) | EP1840907B1 (ja) |
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- 2006-01-20 WO PCT/JP2006/300826 patent/WO2006077957A1/ja active Application Filing
- 2006-01-20 EP EP06712051.9A patent/EP1840907B1/en not_active Expired - Fee Related
- 2006-01-20 CN CNB2006800027811A patent/CN100520993C/zh not_active Expired - Fee Related
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013054769A1 (ja) * | 2011-10-14 | 2013-04-18 | 住友電気工業株式会社 | 圧粉成形体の成形方法 |
JP2013089688A (ja) * | 2011-10-14 | 2013-05-13 | Sumitomo Electric Ind Ltd | 圧粉成形体の成形方法 |
KR20140089377A (ko) * | 2011-10-14 | 2014-07-14 | 스미토모덴키고교가부시키가이샤 | 압분 성형체의 성형 방법 |
US9431171B2 (en) | 2011-10-14 | 2016-08-30 | Sumitomo Electric Industries, Ltd. | Method for molding powder mold product |
KR102016189B1 (ko) * | 2011-10-14 | 2019-08-29 | 스미토모덴키고교가부시키가이샤 | 압분 성형체의 성형 방법 |
CN107527723A (zh) * | 2016-06-17 | 2017-12-29 | 株式会社田村制作所 | 压粉磁芯、电抗器、软磁性材料及压粉磁芯的制造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1840907A4 (en) | 2011-08-31 |
US7544417B2 (en) | 2009-06-09 |
EP1840907B1 (en) | 2016-08-24 |
EP1840907A1 (en) | 2007-10-03 |
CN100520993C (zh) | 2009-07-29 |
CN101107681A (zh) | 2008-01-16 |
JP2006202956A (ja) | 2006-08-03 |
US20080152897A1 (en) | 2008-06-26 |
JP4613622B2 (ja) | 2011-01-19 |
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