WO2005043560A1 - 磁気特性に優れ、高強度および低鉄損を有する複合軟磁性材の製造方法 - Google Patents
磁気特性に優れ、高強度および低鉄損を有する複合軟磁性材の製造方法 Download PDFInfo
- Publication number
- WO2005043560A1 WO2005043560A1 PCT/JP2004/015984 JP2004015984W WO2005043560A1 WO 2005043560 A1 WO2005043560 A1 WO 2005043560A1 JP 2004015984 W JP2004015984 W JP 2004015984W WO 2005043560 A1 WO2005043560 A1 WO 2005043560A1
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- WO
- WIPO (PCT)
- Prior art keywords
- soft magnetic
- silicone resin
- powder
- magnetic powder
- temperature
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
Definitions
- the present invention relates to a method for producing a composite soft magnetic material having excellent magnetic properties, high strength and low iron loss, and this composite soft magnetic material is used for an injector component, an induction component, and a solenoid valve. It is used for manufacturing cores and motor cores.
- soft magnetic powders include iron powder, Fe-Si based iron-based soft magnetic alloy powder, Fe-A1-based iron-based soft magnetic alloy powder, Fe-Si-A1-based iron-based soft magnetic alloy powder, Fe- Cr-based iron-based soft magnetic alloy powder, Ni-based soft magnetic alloy powder, Fe-Co-based soft magnetic alloy powder, and the like are known, and it is known that pure iron powder is used as the iron powder.
- Fe—Si-based iron-based soft magnetic alloy powder contains 0.1% to 10% of Si, with the balance being Fe and unavoidable impurities. It is known to use silicon steel powder which contains Fe and the balance is Fe and unavoidable impurity power, more specifically, Fe-3% Si powder).
- Fe-A1-based iron-based soft magnetic alloy powder contains A1: 0.05-10, with the balance being Fe and unavoidable impurities, Fe-Al-based iron-based soft magnetic alloy powder (for example, Fe-15% A1 powder) It is known to use alpalm powder having a variable composition).
- Fe-Si-Al-based iron-based soft magnetic alloy powder contains Fe: 0.1-10% by mass, A1: 0.05-10, Fe-Si-A1-based iron with the balance being Fe and unavoidable impurities It is known to use base soft magnetic alloy powder (for example, sendust powder having a composition as strong as Fe-9% Si-5% A1),
- Fe—Cr-based iron-based soft magnetic alloy powder contains 1 to 20% of Cr: 1% or less of A1: 5% or less and Si: 5% or less as necessary, with the balance being the balance.
- Cr 1% or less of A1: 5% or less
- Si 5% or less as necessary
- Ni-based soft magnetic alloy powder contains 35-85% Ni: Mo: 5 % Or less, Cu: 5% or less, Cr: 2% or less, Mn: 0.5% or less, one or more of the following, and the balance is Fe and unavoidable impurities.
- Fe-79% Ni powder is known to be used.
- Fe-Co-based iron-based soft magnetic alloy powder contains 10-60% Co: V-0.1-13% if necessary, with the balance being Fe and unavoidable impurities. It is known to use iron-based soft magnetic alloy powders (the above,% indicates mass%).
- soft magnetic powder in which an insulating film is formed on the surface of a soft magnetic powder has an oxide film formed on the surface by subjecting the soft magnetic powder to a high-temperature oxidation treatment. Insulating the surface by subjecting the formed oxide-coated soft magnetic powder and soft magnetic powder to a phosphoric acid treatment and applying a steam treatment to the phosphoric acid-coated soft magnetic powder and the soft magnetic powder with a phosphoric acid film formed on the surface Hydroxide film-coated soft magnetic powder having a water-soluble hydroxide film is known.
- the soft magnetic powder coated with a phosphoric acid film having a phosphoric acid film formed on the surface of the soft magnetic powder is most frequently used.
- a composite soft magnetic material using a thermoplastic resin such as a thermoplastic resin, and a thermosetting resin such as a phenol resin or an epoxy resin organic resin is not preferable because it is carbonized or burned. Therefore, a composite soft magnetic material using water glass as a binder has been proposed (see Patent Document 1).
- the composite soft magnetic material using water glass as a binder has lower strength than the composite soft magnetic material using an organic resin as a binder, and further has low durability because it absorbs moisture and softens. Therefore, in recent years, a composite soft magnetic material produced using a silicone resin as a binder has been proposed.
- the composite soft magnetic material using this silicone resin as a binder is a soft magnetic powder. Is heated in an atmosphere of 250 ° -950 ° C. to form an insulating film as an insulating film on the surface to produce a soft magnetic powder coated with an insulating film. Silicone resin: 0.5 to 10% by mass is added, mixed, compression molded, and then calcined in a non-oxidizing atmosphere at a temperature of 500 to 1000 ° C to remove distortion. Patent Document 2).
- Patent Document 1 JP-A-56-155510
- Patent Document 2 JP-A-6-342714
- the present inventors have improved the magnetic properties by further reducing the amount of silicone resin contained in the composite soft magnetic material and further increasing the content of the soft magnetic powder or the insulating film-coated soft magnetic powder.
- research was conducted to produce a composite soft magnetic material that retains high strength and low iron loss. as a result,
- An ultra-thin silicone resin film-forming soft magnetic powder with a thickness of 0.1 to 5 m is formed on the surface of the soft magnetic powder or the insulating film-coated soft magnetic powder.
- the film-forming soft magnetic powder was previously heated to room temperature or up to 150 ° C, and the silicone resin film-forming soft magnetic powder heated to a temperature in the range of from room temperature to 150 ° C was heated to 100 to 150 ° C.
- the composite soft magnetic material obtained by filling into a mold and compression-molding at a pressure of 600 to 1500 MPa to produce a molded body and firing the molded body at a temperature of 400 to 600 ° C. is a soft magnetic powder. It is evenly coated with thin silicone grease. Even when the amount of fat added is less than 0.5% by mass, it has almost the same high strength and low iron loss as the composite soft magnetic material prepared by the conventional method, and further increases the soft magnetic powder content to increase the magnetic properties. Characteristics are improved,
- the insulating film-coated soft magnetic powder is a phosphoric acid film-coated soft magnetic powder having a phosphoric acid film on the surface, and the research results have been obtained.
- Silicone resin film-forming soft magnetic powder in which an extremely thin silicone resin film having a thickness of 0.1- is formed on the surface of ordinary soft magnetic powder or insulating film-coated soft magnetic powder is generally commercially available. Liquid silicone resin is added to soft magnetic powder or soft magnetic powder coated with an insulating film in an amount of less than 0.1-0.5% by mass, mixed by the usual method, and dried in the air. Can be made. This thickness: 0.1-5 m
- the composite soft magnetic material made with the extremely thin silicone resin film-forming soft magnetic powder with the silicone resin film formed on it has a reduced amount of silicone resin contained therein. 0.1 to 0.5% by mass.
- the powder was prepared by adding less than 0.1-0.5% by mass of liquid silicone resin to a commercially available soft magnetic powder having a phosphoric acid film coated with a phosphoric acid film on the surface and mixing by a usual method. Thereafter, it can be easily manufactured by drying in the air.
- This thickness Silicone resin film formation with an extremely thin silicone resin film of 0.1-5 / zm
- the composite soft magnetic material made using soft magnetic powder has an amount of 0.1% silicone resin contained therein. -0.5% by mass.
- the content of the soft magnetic powder or the soft magnetic powder coated with a phosphoric acid film is further increased, thereby improving the magnetic properties and improving the conventional magnetic properties.
- a composite soft magnetic material having the same high strength and low iron loss as the composite soft magnetic material can be manufactured.
- the thickness of the silicone resin film formed on the surface of the silicone resin film-forming soft magnetic powder used in the method for producing a composite soft magnetic material of the present invention is set to 0.1 to 5 m because the silicone resin If the thickness of the resin film is less than 0.1 l / zm, sufficient strength and specific resistance of the composite soft magnetic material cannot be secured, while if the thickness of the silicone resin film exceeds 5 m, the composite This is because the amount of the silicone resin contained in the soft magnetic material is 0.5% by mass or more, and sufficient soft magnetic properties cannot be obtained.
- the soft silicone resin film-forming soft magnetic powder is heated to a predetermined temperature between room temperature and 150 ° C, filled in a mold heated to a temperature of 100-150 ° C, and compression-molded.
- the reason that the mold is heated to 100-150 ° C is that when a colloidal lubricant is applied to the mold wall, the moisture contained in the lubricant evaporates and the solid lubricant becomes solid.
- the purpose of this is to increase the molding density of the silicone resin film-forming soft magnetic powder.
- the heating temperature of the mold does not need to exceed 150 ° C, a force that needs to be above 100 ° C.
- the silicone resin-coated soft magnetic powder to be filled into the heated mold is heated at more than 150 ° C.
- the soft magnetic powder is oxidized and adversely affects the compressibility. Therefore, it is preferable that the silicone magnetic film-forming soft magnetic powder to be filled in the mold is kept at a maximum of 150 ° C even if heated.
- the compression molding of the silicone resin film-forming soft magnetic powder filled in a powerful mold at 600 to 1500 MPa is because sufficient compression density cannot be obtained if the compression molding pressure is less than 600 MPa. On the other hand, if it exceeds 1500 MPa, the specific resistance is lowered, and the dimensional accuracy is greatly reduced due to the reduction in the mold strength, which is not preferable.
- the compact obtained by compression molding is calcined by keeping it in the atmosphere at a temperature of 400 to 600 ° C for 30 to 60 minutes. By firing at this temperature, the silicone resin is vitrified to obtain a high-strength composite soft magnetic material. By firing at this temperature, the distortion of the soft magnetic powder is removed, and the soft magnetic properties are restored.
- the reason why the firing temperature is limited to 400-600 ° C is that it is not preferable because the strain generated at the time of compression molding is insufficient when the temperature is lower than 400 ° C, whereas the specific resistance decreases when the temperature exceeds 600 ° C. This is for unfavorable reasons.
- a phosphoric acid film was formed by subjecting pure iron powder to a phosphoric acid treatment to prepare a phosphoric acid film-forming soft magnetic powder, and a liquid silicone resin was further prepared.
- Liquid silicone resin in the ratio shown in Table 1 was added to this phosphate magnetic film-forming soft magnetic powder, and mixed in air to obtain a silicone resin having a silicone resin film having an average thickness shown in Table 1.
- a resin film-forming soft magnetic powder was prepared.
- the silicone resin film-forming soft magnetic powder was heated to the temperature shown in Table 2-3, and the heated silicone resin film-forming soft magnetic powder was heated to the temperature shown in Table 2-3. And molded by compression molding at the pressure shown in Table 2-3, and then held in air at the temperature shown in Table 2-3 for the time shown in Table 2-3.
- a soft magnetic test piece having a length of 5 mm, a width of 10 mm, a length of 60 mm and an outer diameter of 35 mm, an inner diameter of Soft magnetic test pieces having dimensions of 25 mm and height: 5 mm were prepared. Using these soft magnetic test pieces, bending strength, density, specific resistance, iron loss and magnetic flux density at room temperature were measured, and the measurement results are shown in Table 2-3.
- Conventional example 1 Conventional example 1
- silicone resin powder 5% by mass was added to the phosphoric acid film-forming soft magnetic powder prepared in the example and mixed with the mixture to form a silicone resin powder: 5% by mass;
- a mixed powder having a composition is prepared, the mixed powder is filled into a mold at room temperature, and compression molded at a pressure of 700 MPa to form a molded body. The molded body is heated at 700 ° C for 120 minutes.
- a soft magnetic test piece having dimensions of 5 mm (length), 10 mm (width), and 60 mm (length) and an outer diameter: 35 mm, an inner diameter: 25 mm, and a height: 5 mm were obtained.
- a soft magnetic test piece was prepared. Using this soft magnetic test piece, the transverse rupture strength, density, specific resistance, iron loss and magnetic flux density at room temperature were measured. The measurement results are shown in Table 3.
- the soft magnetic powder having the silicone resin film formed in Table 4 was heated to the temperature shown in Table 5-6, and the heated soft magnetic powder having the silicone resin film formed was heated to the temperature shown in Table 5-6.
- a molded product is prepared by filling the mold and compression-molding at a pressure shown in Table 5-6, and then, in air, at a temperature shown in Table 5-6 and shown in Table 5-6.
- a soft magnetic test piece having dimensions of length: 5 mm, width: 10 mm, length: 60 mm and outer diameter: Soft magnetic test pieces having dimensions of 35 mm, inner diameter: 25 mm, and height: 5 mm were prepared.
- the bending strength, density, specific resistance, iron loss and magnetic flux density at room temperature were measured using these soft magnetic test pieces, and the measurement results are shown in Table 5-6.
- silicone resin 5% by mass
- silicone resin 5% by mass
- the remainder a soft magnetic powder having a phosphoric acid film-forming soft magnetic powder.
- a mixed powder is prepared, and the mixed powder is filled in a mold at room temperature, and compression-molded at a pressure of 700 MPa to form a molded body. The molded body is heated at 700 ° C. for 120 minutes.
- a soft magnetic test piece having dimensions of 5 mm in length, 10 mm in width, and 60 mm in length and a soft magnetic test piece having dimensions of 35 mm in outer diameter, 25 mm in inner diameter, and 5 mm in height by performing the method 2 was prepared. Using this soft magnetic test piece, the bending strength, density, specific resistance, iron loss and magnetic flux density at room temperature were measured. The measurement results are shown in Table 6.
- the soft magnetic test piece manufactured by the method 117 of the present invention has excellent soft magnetic properties compared to the soft magnetic test piece manufactured by the conventional method 2. You. In addition, it can be seen that some of the soft magnetic test pieces produced by Comparative Methods 8-13, which also deviated from the conditional force of the present invention, exhibited some undesirable characteristics.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04793092A EP1679726A4 (en) | 2003-10-31 | 2004-10-28 | METHOD FOR PRODUCING A COMPOSITE SOFT MAGNETIC MATERIAL WITH EXCELLENT MAGNETIC PROPERTIES, HIGH STRENGTH AND LOW IRON LOSSES |
US10/595,591 US20070243400A1 (en) | 2003-10-31 | 2004-10-28 | Method for Producing Composite Soft Magnetic Material Exhibiting Excellent Magnetic Characteristics, High Strength and Low Core Loss |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003371993A JP2005133168A (ja) | 2003-10-31 | 2003-10-31 | 磁気特性に優れ、高強度および低鉄損を有する複合軟磁性材の製造方法 |
JP2003-371993 | 2003-10-31 |
Publications (1)
Publication Number | Publication Date |
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WO2005043560A1 true WO2005043560A1 (ja) | 2005-05-12 |
Family
ID=34543986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015984 WO2005043560A1 (ja) | 2003-10-31 | 2004-10-28 | 磁気特性に優れ、高強度および低鉄損を有する複合軟磁性材の製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070243400A1 (ja) |
EP (1) | EP1679726A4 (ja) |
JP (1) | JP2005133168A (ja) |
CN (1) | CN1883017A (ja) |
WO (1) | WO2005043560A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8568644B2 (en) | 2008-05-23 | 2013-10-29 | Sumitomo Electric Industries, Ltd. | Method for producing soft magnetic material and method for producing dust core |
Families Citing this family (20)
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JP2007324270A (ja) * | 2006-05-31 | 2007-12-13 | Toyota Motor Corp | 磁性粉末の製造方法および圧粉コアの製造方法 |
JP4630251B2 (ja) | 2006-09-11 | 2011-02-09 | 株式会社神戸製鋼所 | 圧粉磁心および圧粉磁心用の鉄基粉末 |
JP4723442B2 (ja) * | 2006-09-11 | 2011-07-13 | 株式会社神戸製鋼所 | 圧粉磁心および圧粉磁心用の鉄基粉末 |
JP4812605B2 (ja) * | 2006-11-28 | 2011-11-09 | トヨタ自動車株式会社 | 圧粉コアの製造方法、ステータコアおよびモータ |
JP2008169439A (ja) * | 2007-01-12 | 2008-07-24 | Toyota Motor Corp | 磁性粉末、圧粉磁心、電動機およびリアクトル |
JP2008270539A (ja) * | 2007-04-20 | 2008-11-06 | Toyota Motor Corp | 圧粉磁心とその製造方法、電動機およびリアクトル |
WO2009013979A1 (ja) | 2007-07-26 | 2009-01-29 | Kabushiki Kaisha Kobe Seiko Sho | 圧粉磁心用鉄基軟磁性粉末および圧粉磁心 |
JP2009032880A (ja) * | 2007-07-26 | 2009-02-12 | Kobe Steel Ltd | 高周波用の圧粉磁心用鉄基軟磁性粉末および圧粉磁心 |
JP4856602B2 (ja) * | 2007-08-02 | 2012-01-18 | 株式会社神戸製鋼所 | 圧粉磁心用鉄基軟磁性粉末および圧粉磁心 |
JP2009117651A (ja) * | 2007-11-07 | 2009-05-28 | Mitsubishi Materials Pmg Corp | 高強度軟磁性複合圧密焼成材およびその製造方法 |
JP4740417B2 (ja) * | 2007-11-16 | 2011-08-03 | 株式会社神戸製鋼所 | 圧粉磁心用鉄粉及びその製造方法 |
WO2010061525A1 (ja) * | 2008-11-26 | 2010-06-03 | 住友電気工業株式会社 | 軟磁性材料の製造方法、および圧粉磁心の製造方法 |
JP5202382B2 (ja) | 2009-02-24 | 2013-06-05 | 株式会社神戸製鋼所 | 圧粉磁心用鉄基軟磁性粉末およびその製造方法、ならびに圧粉磁心 |
JP5078932B2 (ja) * | 2009-03-19 | 2012-11-21 | 株式会社神戸製鋼所 | 圧粉磁心用混合粉末、およびこの混合粉末を用いて圧粉磁心を製造する方法 |
JP5976284B2 (ja) * | 2010-07-23 | 2016-08-23 | 株式会社豊田中央研究所 | 圧粉磁心の製造方法および磁心用粉末の製造方法 |
JP6810438B2 (ja) * | 2015-02-09 | 2021-01-06 | 国立研究開発法人産業技術総合研究所 | 混合粒子、混合粒子を含むスラリー、複合体、および接合体 |
WO2017208824A1 (ja) * | 2016-05-30 | 2017-12-07 | 住友電気工業株式会社 | 被覆磁性粉末の製造方法、圧粉磁心の製造方法、電磁部品の製造方法 |
JP6753807B2 (ja) * | 2017-03-29 | 2020-09-09 | 株式会社神戸製鋼所 | 圧粉磁心用鉄基粉末 |
CN109786096B (zh) * | 2018-12-14 | 2021-07-23 | 浙江工业大学 | 一种二维层状金属软磁复合材料及其制备方法与应用 |
US11371122B2 (en) * | 2019-02-28 | 2022-06-28 | Taiyo Yuden Co., Ltd. | Magnetic alloy powder and method for manufacturing same, as well as coil component made of magnetic alloy powder and circuit board carrying same |
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2003
- 2003-10-31 JP JP2003371993A patent/JP2005133168A/ja not_active Withdrawn
-
2004
- 2004-10-28 WO PCT/JP2004/015984 patent/WO2005043560A1/ja active Application Filing
- 2004-10-28 US US10/595,591 patent/US20070243400A1/en not_active Abandoned
- 2004-10-28 CN CNA2004800318324A patent/CN1883017A/zh active Pending
- 2004-10-28 EP EP04793092A patent/EP1679726A4/en not_active Withdrawn
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JP2005133168A (ja) | 2005-05-26 |
CN1883017A (zh) | 2006-12-20 |
EP1679726A1 (en) | 2006-07-12 |
US20070243400A1 (en) | 2007-10-18 |
EP1679726A4 (en) | 2010-01-20 |
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