WO2005038829A1 - 軟磁性材料の製造方法、軟磁性材料および圧粉磁心 - Google Patents
軟磁性材料の製造方法、軟磁性材料および圧粉磁心 Download PDFInfo
- Publication number
- WO2005038829A1 WO2005038829A1 PCT/JP2004/014477 JP2004014477W WO2005038829A1 WO 2005038829 A1 WO2005038829 A1 WO 2005038829A1 JP 2004014477 W JP2004014477 W JP 2004014477W WO 2005038829 A1 WO2005038829 A1 WO 2005038829A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic particles
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- heat treatment
- magnetic material
- coercivity
- Prior art date
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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
-
- 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
- H01F1/33—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 mixtures of metallic and non-metallic particles; metallic particles having oxide skin
-
- 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
Definitions
- Patent Document 1 discloses a dust core and a method of manufacturing the same for the purpose of maintaining magnetic characteristics even when used under high temperature environment.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-246219 discloses a dust core and a method of manufacturing the same for the purpose of maintaining magnetic characteristics even when used under high temperature environment.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-246219 discloses a dust core and a method of manufacturing the same for the purpose of maintaining magnetic characteristics even when used under high temperature environment.
- PPS resin polyphenylene sulfide
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-246219
- an object of the present invention is to solve the above-mentioned problems, and to provide a method of manufacturing a soft magnetic material, a soft magnetic material and a dust core capable of obtaining desired magnetic properties.
- the distortion (dislocation, defect) existing inside the metal magnetic particle is predicted by performing the first heat treatment on the metal magnetic particle. Keep it down. Under the present circumstances, when the temperature of heat processing is 400 degreeC or more, the effect by 1st heat processing can fully be acquired. In addition, when the temperature of the heat treatment is less than 900 ° C., the metal magnetic particles are not sintered and solidified during the heat treatment. When the metallic magnetic particles are sintered, it is necessary to mechanically strain the solidified metallic magnetic particles, which may cause new distortion inside the metallic magnetic particles.
- the heat treatment temperature is 900 ° By setting it to less than C, such a fear can be avoided.
- the distortion existing inside the molded body is generated during the pressure forming, and the distortion is reduced compared to the case where the first heat treatment is not performed. be able to.
- the magnetic permeability can be increased, and desired magnetic characteristics with reduced coercivity can be obtained.
- the composite magnetic particles are easily deformed during pressure molding. For this reason, it is possible to form a molded body by intertwining a plurality of composite magnetic particles without gaps, so that the molded body The density can be increased.
- the step of performing the first heat treatment includes the step of heat treating the metal magnetic particles at a temperature of 700 ° C. or more and less than 900 ° C.
- the first heat treatment can further reduce the strain existing inside the metal magnetic particles.
- the step of forming a formed body includes the step of forming a formed body in which a plurality of composite magnetic particles are joined with an organic substance.
- an organic matter intervenes between each of the plurality of composite magnetic particles.
- the organic substance exerts a function as a lubricant at the time of pressure forming, so that the destruction of the insulating coating can be suppressed.
- the step of performing the first heat treatment includes the step of setting the coercivity of the metal magnetic particles to 2.0 ⁇ 10 2 AZm or less.
- the first heat treatment reduces the coercivity of the metal magnetic particles to a level of 2.0 ⁇ 10 2 AZm or less in advance, thereby providing the molded product Increase permeability and reduce coercivity The effect can be obtained more effectively.
- the coercivity of the molded body can be reduced, and the iron loss caused by the hysteresis loss can be reduced.
- the particle size distribution By setting the particle size distribution to 38 m or more, the metallic magnetic particles can be prevented from attracting each other and becoming solidified with each other. Further, by making the particle size distribution less than 355 / z m, it is possible to reduce the intraparticle eddy current loss of the metallic magnetic particles. Thereby, the iron loss of the molded object resulting from an eddy current loss can be reduced.
- the step of performing the first heat treatment includes a step of heat treating metal magnetic particles having a particle size distribution substantially present only in the range of 75 ⁇ m or more and less than 355 ⁇ m.
- metal magnetic particles having a particle size of 38 ⁇ m or more and less than 75 ⁇ m By further removing metal magnetic particles having a particle size of 38 ⁇ m or more and less than 75 ⁇ m, the ratio of the surface powder to stress distortion due to surface energy can be further reduced, and the coercivity can be reduced. It becomes possible to make it small.
- the soft magnetic material according to the present invention comprises a plurality of metallic magnetic particles.
- the coercive force of the metal magnetic particles is 2. OX 10 2 AZm or less, and the particle diameter of the metal magnetic particles is substantially distributed only in the range of 38 ⁇ m or more and less than 355 ⁇ m.
- the metal magnetic particles which are raw materials for producing a compact, have a low coercive force of 2. OX 10 2 AZm or less.
- the particle size of the metal magnetic particles is present only in the range of 38 m or more and less than 355 m, the effect of “stress strain due to surface energy” is suppressed and the intra-particle eddy current loss of the metal magnetic particles is reduced. It can be reduced.
- a molded body is produced using the soft magnetic material according to the present invention In this case, the iron loss of the molded body can be reduced through the reduction of both the hysteresis loss and the eddy current loss.
- the coercive force of the metal magnetic particles is not more than 1.2 ⁇ 10 2 AZm. More preferably, the metal magnetic particles are substantially distributed only in the range of 75 ⁇ m or more and less than 355 ⁇ m.
- the soft magnetic material comprises a plurality of composite magnetic particles including metal magnetic particles and an insulating film surrounding the surface of the metal magnetic particles. According to the soft magnetic material configured as described above, by providing the insulating coating, it is possible to suppress the flow of eddy current between the metal magnetic particles. Thereby, the iron loss resulting from the interparticle eddy current can be reduced.
- the coercivity of a dust core produced using the above-described soft magnetic material described in any one of the above is 1.2 ⁇ 10 2 AZm or less. According to the dust core configured as described above, the coercive force of the dust core is sufficiently small, so that the hysteresis loss can be reduced. As a result, even in the low frequency region where the ratio of hysteresis loss to iron loss increases, it is possible to use a powder magnetic core made of soft magnetic material V and manufactured.
- FIG. 1 is an enlarged schematic view showing a compact produced by the method of producing a soft magnetic material according to Embodiment 1 of the present invention.
- FIG. 2 is a graph showing the relationship between the temperature of heat treatment applied to metallic magnetic particles and the maximum permeability of a formed body.
- the molded body is formed by metal magnetic particles 10 and a plurality of composite magnetic particles 30 consisting of insulating coating 20 surrounding the surface of metal magnetic particles 10 and each of the plurality of composite magnetic particles 30 being interposed.
- the organic substance 40 is composed of Each of the plurality of composite magnetic particles 30 is bonded by the organic substance 40 or by bonding of the irregularities of the composite magnetic particles 30.
- metal magnetic particles 10 are prepared.
- the metallic magnetic particles 10 are, for example, iron (Fe), iron (Fe) silicon (Si) alloy, iron (Fe) nitrogen (N) alloy, iron (Fe) -nickel (Ni) alloy, iron (Fe) Carbon (C) alloy, iron (Fe) boron (B) alloy, iron (Fe) cobalt (Co) alloy, iron (Fe) phosphorus (P) alloy, iron (Fe) It is possible to form a caustic such as a nickel (K) cobalt (Co) alloy and an iron (Fe) aluminum (A1) -silicon (Si) alloy.
- the metal magnetic particles 10 may be a single metal or an alloy.
- the average particle diameter of the metallic magnetic particles 10 is preferably 5 ⁇ m or more and 300 ⁇ m or less!
- the metal is less likely to be oxidized, so that the magnetic properties of the soft magnetic material can be improved.
- the average particle size of the metal magnetic particles 10 is set to 300 m or less, the compressibility of the mixed powder does not decrease at the time of pressure molding to be described later. Thereby, the density of the compact obtained by pressure molding can be increased.
- the particle size of the metal magnetic particles 10 is preferably substantially distributed only in the range of 38 ⁇ m or more and less than 355 ⁇ m.
- metal magnetic particles 10 in which particles having a particle diameter of less than 38 ⁇ m and particles having a particle diameter of 355 ⁇ m or more are forcibly excluded are used. More preferably, the particle diameter of the metallic magnetic particles 10 is substantially distributed only in the range of 75 ⁇ m or more and less than 355 ⁇ m.
- the metal magnetic particles 10 are heat-treated at a temperature of 400 ° C. or more and less than 900 ° C.
- Heat treatment temperature The degree is more preferably 700 ° C. or more and less than 900 ° C.
- the composite magnetic particle 30 is produced by forming the insulating film 20 on the surface of the metal magnetic particle 10.
- the insulating coating 20 can be formed by phosphating the metallic magnetic particles 10.
- Insulating coating 20 functions as an insulating layer between metallic magnetic particles 10.
- the electrical resistivity p of the soft magnetic material can be increased. Thereby, it is possible to suppress the flow of the eddy current between the metal magnetic particles 10, and to reduce the iron loss of the soft magnetic material caused by the eddy current.
- the thickness of the insulating coating 20 is preferably not less than 0.005 ⁇ m and not more than 20 ⁇ m.
- the thickness of the insulating film 20 is preferably not less than 0.005 ⁇ m and not more than 20 ⁇ m.
- thermoplastic resin such as thermoplastic polyimide, thermoplastic polyamide, thermoplastic polyamideimide, polytetrafluoroethylene, polyamideimide, polyethersulfone, polyetherimide or polyetheretherketone
- Non-thermoplastic resins such as high molecular weight polyethylene, wholly aromatic polyester or wholly aromatic polyimide, zinc stearate, lithium stearate, calcium stearate, lithium palmitate, calcium palmitate, lithium oleate and calcium oleate And other higher fatty acids can be used. Moreover, these can also be mixed and used mutually.
- the ratio of the organic substance 40 to the soft magnetic material is preferably more than 0 and 1.0% by mass or less. By setting the ratio of the organic substance 40 to 1.0% by mass or less, the ratio of the metal magnetic particles 10 to the soft magnetic material can be ensured to a certain level or more. Thereby, a soft magnetic material with higher magnetic flux density can be obtained.
- the strain originally present inside the metal magnetic particle 10 is already removed by the heat treatment applied to the metal magnetic particle 10! /, So the strain existing inside the compact after pressure forming.
- the amount of is relatively small.
- the distortion generated at the time of pressure molding is not complicatedly intertwined with the distortion originally existing inside the metal magnetic particles 10.
- the new strain is generated by applying pressure from one direction to the mixed powder contained in the mold. For these reasons, heat treatment at a relatively low temperature below the thermal decomposition temperature of insulating coating 20! easily reduce the distortion present inside the molded body despite It is possible to
- the composite magnetic particles 30 are easily deformed during pressure molding. For this reason, as shown in FIG. 1, it is possible to form a molded body without a gap in which a plurality of composite magnetic particles 30 are intermingled with each other. Thereby, the density of the molded body can be increased, and high permeability can be obtained.
- the mixing step of the organic substance 40 with the composite magnetic particle 30 may be carried out by a pressing step which is continued with only the composite magnetic particle 30 which does not mix the organic substance 40 which is an essential step.
- the metal magnetic particles 10 are subjected to a first heat treatment at a temperature of 400 ° C. or more and less than 900 ° C .;
- the method includes the steps of forming a plurality of composite magnetic particles 30 surrounded by the insulating film 20, and forming a compact by pressure molding the plurality of composite magnetic particles 30.
- the method of manufacturing the soft magnetic material further includes the step of performing the second heat treatment at a temperature of 200 ° C. or more and the thermal decomposition temperature of the insulating coating 20 or less.
- the metal magnetic particles 10 are subjected to heat treatment in a predetermined temperature range.
- This heat treatment is more preferable because a compact can be formed in a state in which the amount of distortion that will not deteriorate the insulating coating 20 is small.
- distortion existing inside the molded body can be further reduced.
- the magnetic permeability can be increased, and desired magnetic characteristics with reduced coercivity can be obtained.
- the soft magnetic material according to the second embodiment of the present invention is a metal obtained by heat treatment at a temperature of 400 ° C. or more and less than 900 ° C. in the method of manufacturing the soft magnetic material described in the first embodiment.
- a magnetic particle 10 is provided.
- the method of manufacturing a soft magnetic material and the soft magnetic material according to the present invention includes, for example, a powder magnetic core, a choke coil, a switching power supply element, a magnetic head, various motor parts, automotive solenoids, various magnetic sensors, and various electromagnetics. It can be used to make products such as valves.
- the molded body in FIG. 1 was produced.
- iron powder (trade name “ASC 100. 29”) manufactured by Heganes Co., Ltd. was used as the metal magnetic particle 10.
- the metallic magnetic particles 10 were heat-treated under different temperature conditions ranging from 100 ° C. to 1000 ° C. The heat treatment was performed for 1 hour in hydrogen or inert gas. The coercivity of the metal magnetic particles 10 was measured after the heat treatment, and a value of less than 2.5 oersteds was obtained.
- a phosphate film as the insulating film 20 was formed so as to cover the metal magnetic particles 10, and composite magnetic particles 30 were produced.
- composite magnetic particles 30 were also produced in the case where the heat treatment was not performed on the metal magnetic particles 10.
- the composite magnetic particles 30 are placed in a mold without being mixed with the organic substance 40, and then pressure molding is performed. Did. The applied pressure was 882 MPa. The maximum permeability and coercivity of the resulting molded body were measured. Next, the compact was subjected to heat treatment at a temperature of 300 ° C. for 1 hour. Thereafter, the maximum permeability and coercivity of the shaped body were measured again.
- Each measured value at 30 ° C. is obtained when the heat treatment is not performed on the metallic magnetic particles 10.
- the maximum magnetic permeability of the compact before heat treatment is increased by heat treating the metal magnetic particles 10 at a temperature of 400 ° C. or more and less than 900 ° C., and the coercive force is lowered. I was able to hesitate. In particular, regarding the maximum permeability, such an effect could be obtained more significantly than the coercivity. In addition, when the metal magnetic particles 10 were heat-treated at a temperature of 700 ° C. or higher, it was possible to obtain approximately the maximum maximum permeability and approximately the minimum coercive force among the measurements. On the other hand, in the case of heat treatment at temperatures of 900 ° C.
- the metal magnetic particles 10 were partially sintered, and there was a problem that the portion could not be used in the next step. Also, the maximum permeability and coercivity compared to the case of heat treatment at a temperature of 850 ° C. There was almost no change in the force.
- Atomized iron powder as metal magnetic particles 10 produced by a water atomization method was classified using a sieve, and atomized iron powders of samples 1 to 7 having different particle size distributions were prepared.
- the matte iron powder was heat-treated at a temperature of 800 ° C. in hydrogen or an inert gas for 1 hour. Next, the coercivity of the heat-treated atomized iron powder was measured by the measurement method described below.
- an appropriate amount of atomized iron powder was solidified into a pellet using a resin binder to prepare a solid piece for measurement.
- a magnetic field of 1 (T: Tesla) ⁇ 1 T ⁇ 1 T ⁇ 1 T is sequentially applied to the solid piece, and a sample vibration type magnetometer (VSM) is used to measure the magnetic field (magnetic field) ⁇ (magnetic field) )
- VSM sample vibration type magnetometer
- the shape of the loop was identified.
- the coercivity of the solid piece was calculated from the shape of the weir loop, and the coercivity of the atomized iron powder was used as the obtained coercivity.
- the measurement results are shown in Table 2 together with the particle size distribution of each sample of atomized iron powder. Further, for comparison, the particle size distribution of the insulating coated iron powder (trade names “Somaloy 500” and “Somaloy 550”) manufactured by Heganes Co., Ltd. and the coercive force thereof are shown in Table 2.
- a phosphate film as the insulating film 20 was formed so as to cover the heat-treated atomized iron powder, and the coated atomized iron powder was put into a mold and subjected to pressure forming.
- the applied pressure was 882 MPa.
- the obtained molded product was subjected to heat treatment at a temperature of 300 ° C. for 1 hour. Thereafter, the coercivity and the maximum permeability of the molded body were measured. Further, by the same process, a molded body was produced under the trade names “Somaloy 500” and “Somaloy 550” manufactured by Henganes Co., Ltd., and the coercivity and maximum magnetic permeability of the molded body were also measured. The above measurement results are shown in Table 2.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04791944A EP1675137B1 (en) | 2003-10-15 | 2004-10-01 | Process for producing soft magnetism material |
US10/595,314 US7601229B2 (en) | 2003-10-15 | 2004-10-01 | Process for producing soft magnetism material, soft magnetism material and powder magnetic core |
ES04791944T ES2381880T3 (es) | 2003-10-15 | 2004-10-01 | Proceso para producir material magnético blando, material magnético blando y núcleo de polvo magnético |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003354940 | 2003-10-15 | ||
JP2003-354940 | 2003-10-15 | ||
JP2003356031 | 2003-10-16 | ||
JP2003-356031 | 2003-10-16 | ||
JP2004-024256 | 2004-01-30 | ||
JP2004024256A JP2005142522A (ja) | 2003-10-16 | 2004-01-30 | 軟磁性材料の製造方法、軟磁性材料および圧粉磁心 |
Publications (2)
Publication Number | Publication Date |
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WO2005038829A1 true WO2005038829A1 (ja) | 2005-04-28 |
WO2005038829A8 WO2005038829A8 (ja) | 2005-07-28 |
Family
ID=34468307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/014477 WO2005038829A1 (ja) | 2003-10-15 | 2004-10-01 | 軟磁性材料の製造方法、軟磁性材料および圧粉磁心 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7601229B2 (ja) |
EP (1) | EP1675137B1 (ja) |
ES (1) | ES2381880T3 (ja) |
WO (1) | WO2005038829A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7767034B2 (en) * | 2004-09-30 | 2010-08-03 | Sumitomo Electric Industries, Ltd. | Soft magnetic material, powder magnetic core and method of manufacturing soft magnetic material |
CH698498B1 (de) * | 2006-03-31 | 2009-08-31 | Alstom Technology Ltd | Magnetische abschirmung im stirnbereich des stators eines drehstromgenerators. |
DE102008023059B4 (de) * | 2008-05-09 | 2010-06-10 | Eto Magnetic Gmbh | Verfahren zum Herstellen eines magnetisierbaren metallischen Formkörpers |
JP6052960B2 (ja) * | 2012-01-12 | 2016-12-27 | 株式会社神戸製鋼所 | 軟磁性鉄基粉末の製造方法 |
RU2547378C2 (ru) * | 2013-07-15 | 2015-04-10 | Общество с ограниченной ответственностью "Научно Технический Центр Информационные Технологии" | Способ получения магнитомягкого материала |
DE102013109993A1 (de) * | 2013-09-11 | 2015-03-12 | Endress + Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät, Spulenkern und Feldspule |
CN111192735A (zh) * | 2020-01-17 | 2020-05-22 | 深圳市铂科新材料股份有限公司 | 一种绝缘包覆的金属软磁粉末及其制备方法和用途 |
Citations (7)
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JPH11354359A (ja) * | 1998-06-10 | 1999-12-24 | Hitachi Ltd | 圧粉磁心の製造方法及び製造装置 |
JP2001135515A (ja) * | 1999-11-05 | 2001-05-18 | Tdk Corp | 圧粉磁心 |
JP2002064011A (ja) * | 2000-08-22 | 2002-02-28 | Daido Steel Co Ltd | 圧粉磁心 |
US20020046782A1 (en) | 2000-10-16 | 2002-04-25 | Aisin Seiki Kabushiki Kaisha | Soft magnetism alloy powder, treating method thereof, soft magnetism alloy formed body, and production method thereof |
JP2002246219A (ja) | 2001-02-20 | 2002-08-30 | Hitachi Powdered Metals Co Ltd | 圧粉磁心及びその製造方法 |
JP2003109810A (ja) | 2001-09-28 | 2003-04-11 | Nec Tokin Corp | 圧粉磁芯及びその製造方法 |
JP2003257723A (ja) | 2002-02-28 | 2003-09-12 | Daido Steel Co Ltd | 複合磁性シートおよびその製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4245026A (en) * | 1979-12-26 | 1981-01-13 | Xerox Corporation | Production of low density coated magnetic polymer carrier particulate materials |
US5925836A (en) * | 1997-11-04 | 1999-07-20 | Magnetics International Inc. | Soft magnetic metal components manufactured by powder metallurgy and infiltration |
US5982073A (en) * | 1997-12-16 | 1999-11-09 | Materials Innovation, Inc. | Low core loss, well-bonded soft magnetic parts |
DE60132314T2 (de) * | 2000-03-10 | 2009-01-02 | Höganäs Ab | Verfahren zur herstellung von puder auf eisen-grundlage und puder auf eisengrundlage |
US20050162034A1 (en) * | 2004-01-22 | 2005-07-28 | Wavecrest Laboratories, Inc. | Soft magnetic composites |
-
2004
- 2004-10-01 WO PCT/JP2004/014477 patent/WO2005038829A1/ja active Application Filing
- 2004-10-01 EP EP04791944A patent/EP1675137B1/en not_active Expired - Fee Related
- 2004-10-01 ES ES04791944T patent/ES2381880T3/es active Active
- 2004-10-01 US US10/595,314 patent/US7601229B2/en not_active Expired - Fee Related
Patent Citations (7)
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JPH11354359A (ja) * | 1998-06-10 | 1999-12-24 | Hitachi Ltd | 圧粉磁心の製造方法及び製造装置 |
JP2001135515A (ja) * | 1999-11-05 | 2001-05-18 | Tdk Corp | 圧粉磁心 |
JP2002064011A (ja) * | 2000-08-22 | 2002-02-28 | Daido Steel Co Ltd | 圧粉磁心 |
US20020046782A1 (en) | 2000-10-16 | 2002-04-25 | Aisin Seiki Kabushiki Kaisha | Soft magnetism alloy powder, treating method thereof, soft magnetism alloy formed body, and production method thereof |
JP2002246219A (ja) | 2001-02-20 | 2002-08-30 | Hitachi Powdered Metals Co Ltd | 圧粉磁心及びその製造方法 |
JP2003109810A (ja) | 2001-09-28 | 2003-04-11 | Nec Tokin Corp | 圧粉磁芯及びその製造方法 |
JP2003257723A (ja) | 2002-02-28 | 2003-09-12 | Daido Steel Co Ltd | 複合磁性シートおよびその製造方法 |
Non-Patent Citations (1)
Title |
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See also references of EP1675137A4 |
Also Published As
Publication number | Publication date |
---|---|
WO2005038829A8 (ja) | 2005-07-28 |
US7601229B2 (en) | 2009-10-13 |
EP1675137A1 (en) | 2006-06-28 |
EP1675137A4 (en) | 2010-01-27 |
ES2381880T3 (es) | 2012-06-01 |
EP1675137B1 (en) | 2012-02-08 |
US20070102066A1 (en) | 2007-05-10 |
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