WO2010109850A1 - 複合磁性材料 - Google Patents
複合磁性材料 Download PDFInfo
- Publication number
- WO2010109850A1 WO2010109850A1 PCT/JP2010/002046 JP2010002046W WO2010109850A1 WO 2010109850 A1 WO2010109850 A1 WO 2010109850A1 JP 2010002046 W JP2010002046 W JP 2010002046W WO 2010109850 A1 WO2010109850 A1 WO 2010109850A1
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- WIPO (PCT)
- Prior art keywords
- magnetic material
- composite magnetic
- magnetic powder
- metal magnetic
- binder
- Prior art date
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 239000006247 magnetic powder Substances 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 43
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 21
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 claims abstract description 12
- 125000000524 functional group Chemical group 0.000 claims abstract description 6
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 10
- 125000003545 alkoxy group Chemical group 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910017082 Fe-Si Inorganic materials 0.000 claims description 3
- 229910017133 Fe—Si Inorganic materials 0.000 claims description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 3
- 229910002796 Si–Al Inorganic materials 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 239000007822 coupling agent Substances 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229910000077 silane Inorganic materials 0.000 claims description 2
- 229920002050 silicone resin Polymers 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 17
- 238000010438 heat treatment Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 11
- 239000000428 dust Substances 0.000 description 8
- 230000035699 permeability Effects 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- 230000004907 flux Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000005238 degreasing Methods 0.000 description 5
- -1 polysiloxane Polymers 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 238000005979 thermal decomposition reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- JHPBZFOKBAGZBL-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylprop-2-enoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)=C JHPBZFOKBAGZBL-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000005007 epoxy-phenolic resin Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
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- 239000011368 organic material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
-
- 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
- H01F1/28—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 dispersed or suspended in a bonding agent
-
- 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
- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/02—Magnetic
Definitions
- the present invention relates to a composite magnetic material used for inductors, choke coils, transformers, and the like of electronic equipment.
- a conventional magnetic body for example, in a choke coil used in a high frequency circuit, there are a ferrite magnetic core using ferrite powder and a powder magnetic core which is a molded body of metal magnetic powder.
- the ferrite core has a drawback that the saturation magnetic flux density is small and the direct current superimposition characteristic is inferior. For this reason, in a conventional ferrite core, a gap of several hundreds of ⁇ m is provided in a direction perpendicular to the magnetic path in order to ensure direct current superposition characteristics to prevent a decrease in inductance L value during direct current superposition.
- a wide gap becomes a source of beat noise, and leakage magnetic flux generated from the gap causes a significant increase in copper loss in the winding, particularly in the high frequency band.
- a dust core produced by molding metal magnetic powder has a significantly larger saturation magnetic flux density than a ferrite core, which is advantageous for downsizing.
- a ferrite magnetic core unlike a ferrite magnetic core, it can be used without a gap, so copper loss due to beat noise and leakage magnetic flux is small.
- the dust core is superior to the ferrite core in terms of permeability and core loss.
- the core temperature increases due to the large core loss, and it is difficult to reduce the size.
- dust core it is necessary to increase the green density to improve its magnetic properties, the normal 5 ton / cm 2 or more molding pressure at the time of its manufacture, a 10ton / cm 2 or more compacting pressure by product I need.
- the core loss of the dust core usually consists of hysteresis loss and eddy current loss. Since the specific resistance value of a metal material is low, an eddy current flows so as to suppress the change with respect to the change of the magnetic field, and eddy current loss becomes a problem. Eddy current loss increases in proportion to the square of the frequency and the square of the area through which the eddy current flows. Therefore, by covering the surface of the metal magnetic powder with an insulating material, the area through which the eddy current flows can be suppressed from the entire core extending between the metal magnetic powder particles to only within the metal magnetic powder particles, and eddy current loss can be reduced. .
- Patent Document 1 a technique using a polysiloxane resin has been proposed as in Patent Document 1.
- the present invention solves this problem and provides a composite magnetic material that can be subjected to high-temperature heat treatment and realizes excellent magnetic properties.
- the composite magnetic material of the present invention is a composite magnetic material obtained by pressure molding metal magnetic powder to which a binder is added, and the binder includes an acrylic resin having at least a silyl group as a functional group.
- the metal magnetic powder used in the present embodiment contains at least Fe with high saturation magnetization, and is preferably at least one selected from Fe, Fe—Si, Fe—Ni, and Fe—Si—Al. is there.
- the Fe—Ni-based powder used in the present embodiment has a Ni content of 40 wt% or more and 90 wt% or less, and the balance is made of Fe and inevitable impurities.
- the role of Ni in the present invention is to improve magnetic properties, and the addition amount is preferably 40 wt% or more and 90 wt% or less. If it is less than 40 wt%, the effect of improving the magnetic characteristics is poor, and if it is more than 90 wt%, the saturation magnetization is greatly reduced and the direct current superimposition characteristics are lowered. Furthermore, it is possible to add 1 to 6 wt% of Mo to improve the magnetic permeability.
- the Fe—Si—Al-based powder used in this embodiment has an Si content of 8 wt% or more and 12 wt% or less, an Al content of 4 wt% or more and 6 wt% or less, and the balance is Fe and inevitable impurities. It will be.
- the role of Si and Al in the present invention is to improve the magnetic properties, and is preferably within the above composition range. If the addition amount of Si and Al is less than the above composition range, the effect of improving the magnetic characteristics is poor, and if it is more than the above composition range, the saturation magnetization is greatly reduced and the DC superposition characteristics are deteriorated.
- the average particle size of the metal magnetic powder used in the present embodiment is preferably 1 ⁇ m or more and 100 ⁇ m or less.
- the average particle size is smaller than 1 ⁇ m, the molding density is lowered and the magnetic permeability is lowered, which is not preferable.
- the average particle size is larger than 100 ⁇ m, eddy current loss at high frequencies is increased, which is not preferable. More preferably, it is good to set it as 50 micrometers or less.
- the shape of the metal magnetic powder used in the present embodiment is not particularly limited, and may be selected according to the intended use such as a substantially spherical shape or a flat shape.
- This acrylic resin has a silyl group as a functional group and contains Si that forms an insulating oxide. These Si bonds with oxygen in the acrylic resin skeleton or in the atmosphere of the degreasing process or heat treatment process to form an insulating oxide during the thermal decomposition of the acrylic resin in the degreasing process or heat treatment process described later, and is interposed between the metal magnetic powders. Therefore, the heat resistance of the composite magnetic material is improved, and high temperature heat treatment is possible.
- silicon oxide powder which is a Si oxide
- acrylic resin an acrylic resin.
- silicon oxide powder is hard and has high fracture strength and is not easily deformed. Therefore, it is difficult to increase the density during pressure molding, and the molding density is lowered and the magnetic permeability is lowered.
- the binder is an organic material, and high density can be realized by pressure molding. And in the degreasing process after heat-molding, the heat treatment process, etc., changing the Si contained in the organic body to the insulating oxide improves the heat resistance of the composite magnetic material and enables high-temperature heat treatment.
- the main chain of the acrylic resin is an acrylic polymer and has good thermal decomposability, it can be degreased at a low temperature of about 200 to 400 ° C., and the amount of residual carbon can be significantly reduced.
- Carbon has a strong reducibility and activates the surface of the metal magnetic powder in a high-temperature atmosphere, thereby promoting the sintering of the metal magnetic powder and increasing the eddy current loss. Further, in a high temperature atmosphere, diffusion into the metal magnetic powder occurs, causing a decrease in magnetic properties.
- acrylic resin can significantly reduce the amount of residual carbon as described above, sintering of metal magnetic powders is suppressed even in a high temperature atmosphere of 700 ° C. or higher, and high temperature heat treatment is possible. And the diffusion of carbon to the metal magnetic powder is suppressed, and excellent magnetic properties are realized.
- the silyl group contained in the acrylic resin used in this embodiment preferably has at least one alkoxy group. That is, in the formula (Chemical Formula 1), at least one of R1, R2, and R3 is preferably an alkoxy group. Hydroxyl groups are usually present on the surface of inorganic substances, and alkoxy groups are chemically bonded to the metal magnetic powder surface by a condensation reaction with hydroxy groups present on the metal magnetic powder surface. For this reason, the dispersibility of the acrylic resin with respect to the metal magnetic powder is improved, and the coverage and uniformity of the surface of the metal magnetic powder with the silyl group are improved. That is, the density of the composite magnetic material can be further increased, and the insulation is further improved.
- the alkoxy group preferably has 1 to 4 carbon atoms.
- the reactivity with the surface of the metal magnetic powder can be increased, and the dispersibility of the acrylic resin in the metal magnetic powder can be further improved. That is, the coverage and uniformity of the surface of the metal magnetic powder by the silyl group are further improved, and further the density can be increased and the insulation is further improved.
- the binder used in the present embodiment is, for example, various coupling agents such as silane, titanium, chromium, and aluminum, silicone resin, epoxy, etc.
- Resins, acrylic resins (without silyl groups), butyral resins, phenol resins, and the like can be added as auxiliary agents.
- the amount of the binder used in the present embodiment is preferably in the range of 0.2 to 5.0 parts by weight with respect to 100 parts by weight of the metal magnetic powder. If the amount is less than 0.2 parts by weight, the heat resistance is lowered, which is not preferable. If the amount is more than 5.0 parts by weight, the density of the molded body is reduced and the magnetic characteristics are deteriorated, which is not preferable.
- the method for mixing and dispersing the binder in the present embodiment is not particularly limited, and various ball mills such as a rotating ball mill and a planetary ball mill, a V blender, a planetary mixer, and the like can be used.
- the pressure molding method in the present embodiment is not particularly limited, and a normal pressure molding method is used.
- the molding pressure is preferably in the range of 5 ton / cm 2 to 20 ton / cm 2 . If it is lower than 5 ton / cm 2 , the filling rate of the metal magnetic powder is low and high magnetic properties cannot be obtained. If it is higher than 20 ton / cm 2, the mold becomes large in order to secure the mold strength during pressure molding, and the press machine becomes large in order to ensure the molding pressure. In addition, increasing the size of molds and presses reduces productivity and increases costs.
- the heat treatment after pressure forming in the present embodiment is for preventing the deterioration of magnetic properties due to processing strain introduced into the metal magnetic powder during pressure forming and releasing the processing strain.
- the heat treatment temperature is preferably higher, but if the temperature is increased too much, insulation between the powder particles becomes insufficient and eddy current loss increases, which is not preferable.
- the heat treatment temperature is preferably in the range of 700 to 1000 ° C. When the temperature is lower than 700 ° C., it cannot be said that the processing strain is sufficiently released, and the magnetic characteristics are low, which is not preferable. If it is higher than 1000 ° C., it is difficult to ensure sufficient insulation between the metal magnetic powders, and eddy current loss increases, which is not preferable.
- a non-oxidizing atmosphere is preferable in order to suppress a decrease in magnetic characteristics due to oxidation of the metal magnetic powder, and for example, an inert atmosphere such as argon gas, nitrogen gas, and helium gas.
- an inert atmosphere such as argon gas, nitrogen gas, and helium gas.
- the inert gas purity 4N to 5N can be used.
- the gas of this purity contains about several ppm of oxygen, but the metal magnetic powder does not undergo significant oxidation and does not deteriorate the magnetic properties. In addition, it can be used even in a gas having a purity higher than 5N.
- the temperature range of the degreasing step is preferably 200 to 400 ° C. If it is lower than 200 ° C., the thermal decomposition of the acrylic resin is not sufficient, and if it is higher than 400 ° C., the magnetic properties are deteriorated due to oxidation of the metal magnetic powder, which is not preferable. More preferably, it is in the range of 200 to 350 ° C.
- Example 1 The average particle size is 24 ⁇ m, and the composition is 9.1 Si, 5.6 Al, bal.
- a metal magnetic powder of Fe was prepared. After adding 1.5 parts by weight of the acrylic resin described in (Table 1) as a binder to the prepared metal magnetic powder, a small amount of toluene was added and mixed and dispersed to prepare a compound. The obtained compound was pressure-molded at 15 ton / cm 2 and heat-treated at 820 ° C. for 1 h in an argon gas atmosphere with a purity of 5N.
- the created sample shape is a toroidal core having an outer diameter of 14 mm, an inner diameter of 10 mm, and a height of about 2 mm.
- the obtained samples were evaluated for DC superposition characteristics and core loss.
- the DC superposition characteristics were evaluated by measuring the magnetic permeability at an applied magnetic field of 55 Oe and a frequency of 120 kHz with an LCR meter.
- the core loss was measured using an AC BH curve measuring machine at a measurement frequency of 120 kHz and a measurement magnetic flux density of 0.1 T. The obtained results are shown in (Table 1).
- the obtained samples were evaluated for DC superposition characteristics and core loss.
- the DC superposition characteristics were evaluated by measuring the magnetic permeability at an applied magnetic field of 50 Oe and a frequency of 120 kHz with an LCR meter.
- the core loss was measured using an AC BH curve measuring machine at a measurement frequency of 110 kHz and a measurement magnetic flux density of 0.1 T. The obtained results are shown in (Table 2).
- Table 2 shows that excellent DC superposition characteristics and low core loss are exhibited when the amount of the binder added is in the range of 0.2 to 5.0 parts by weight.
- Example 3 When the average particle size is 20 ⁇ m and the composition is wt%, 5.1 Si, bal.
- a metal magnetic powder of Fe was prepared. After adding 2.5 parts by weight of an acrylic resin having a functional trimethoxysilyl group as a binder to the prepared metal magnetic powder, a small amount of xylene was added and mixed and dispersed to prepare a compound. The obtained compound was subjected to pressure molding at 12 ton / cm 2 to obtain a molded body. The obtained molded body was degreased by heat treatment in the atmosphere at 300 ° C. for 4 hours, and then heat-treated at a temperature described in (Table 3) for 1 hour in a 6N purity helium gas atmosphere.
- the created sample shape is a toroidal core having an outer diameter of 14 mm, an inner diameter of 10 mm, and a height of about 2 mm.
- the obtained samples were evaluated for DC superposition characteristics and core loss.
- the DC superposition characteristics were evaluated by measuring the magnetic permeability at an applied magnetic field of 52 Oe and a frequency of 120 kHz with an LCR meter.
- the core loss was measured using an AC BH curve measuring machine at a measurement frequency of 110 kHz and a measurement magnetic flux density of 0.1 T. The obtained results are shown in (Table 3).
- the composite magnetic material of the present invention has excellent direct current superposition characteristics and low core loss, and is particularly useful for transformer cores, choke coils, magnetic heads, and the like.
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Abstract
Description
以下、本発明の実施の形態1における複合磁性材料について説明する。
平均粒径が24μmで、組成が重量%で9.1Si、5.6Al、bal.Feの金属磁性粉末を準備した。準備した金属磁性粉末に対し、結合材として(表1)記載のアクリル樹脂を1.5重量部添加した後、トルエンを少量加え、混合分散を行いコンパウンドを作成した。得られたコンパウンドを15ton/cm2にて加圧成形を行い、純度5Nのアルゴンガス雰囲気にて820℃で1h熱処理を行った。なお、作成した試料形状は、外形14mm、内径10mm、高さ2mm程度のトロイダルコアである。
平均粒径が15μmで組成が重量%で、49.1Ni、bal.Feの金属磁性粉末を準備した。準備した金属磁性粉末100重量部に対し、結合材として官能基のトリエトキシシリル基を有するアクリル樹脂を(表2)記載の量添加した後、トルエンを少量加え混合分散を行いコンパウンドを作成した。得られたコンパウンドを9ton/cm2にて加圧成形を行い、純度4Nの窒素ガス雰囲気にて780℃で0.5h熱処理を行った。なお、作成した試料形状は、外形14mm、内径10mm、高さ2mm程度のトロイダルコアである。
平均粒径が20μmで組成が重量%で、5.1Si、bal.Feの金属磁性粉末を準備した。準備した金属磁性粉末に対し、結合材として官能基のトリメトキシシリル基を有するアクリル樹脂を2.5重量部添加した後、キシレンを少量加え混合分散を行いコンパウンドを作成した。得られたコンパウンドを12ton/cm2にて加圧成形を行い成形体とした。得られた成形体を300℃で4h大気中熱処理により脱脂を行い、その後純度6Nのヘリウムガス雰囲気にて(表3)記載の温度で1h熱処理を行った。なお、作成した試料形状は、外形14mm、内径10mm、高さ2mm程度のトロイダルコアである。
Claims (8)
- 結合材を添加した金属磁性粉末を加圧して成形された複合磁性材料であって、前記結合材が官能基としてシリル基を有するアクリル樹脂を含むことを特徴とする複合磁性材料。
- 前記シリル基が、アルコキシ基を有することを特徴とする請求項1に記載の複合磁性材料。
- 前記アルコキシ基の炭素数が、1~4であることを特徴とする請求項2に記載の複合磁性材料。
- 前記結合材が、シラン系、チタン系、クロム系、アルミニウム系のカップリング剤や、シリコーン樹脂、エポキシ樹脂、シリル基を含まないアクリル樹脂、ブチラール樹脂、フェノール樹脂より選ばれる少なくとも一種を、アクリル樹脂に助剤として添加したものであることを特徴とする請求項1に記載の複合磁性材料。
- 前記金属磁性粉末への前記結合材の添加量が、前記金属磁性粉末100重量部に対し、0.2~5.0重量部であることを特徴とする請求項1に記載の複合磁性材料。
- 前記金属磁性粉末が、Fe、Fe-Si系、Fe-Ni系、Fe-Si-Al系より選ばれる少なくとも一種であることを特徴とする請求項1に記載の複合磁性材料。
- 前記金属磁性粉末の平均粒径が、1μm以上100μm以下であることを特徴とする請求項1に記載の複合磁性材料。
- 非酸化性雰囲気中で700~1000℃の温度で熱処理されたことを特徴とする請求項1に記載の複合磁性材料。
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US8808566B2 (en) | 2009-03-25 | 2014-08-19 | Panasonic Corporation | Composite magnetic material |
CN113808840A (zh) * | 2021-08-30 | 2021-12-17 | 浙江工业大学 | 一种精确预固化的高固含量一体化电感材料及其制备方法 |
US11222739B2 (en) | 2016-03-10 | 2022-01-11 | Panasonic Intellectual Property Management Co., Ltd. | Ferrite material, composite magnetic body, coil component, and power supply device |
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CN103236332B (zh) * | 2013-05-20 | 2016-01-20 | 哈尔滨工业大学 | 复合软磁材料的制备方法 |
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