WO2019208768A1 - 磁心用粉末、それを用いた磁心及びコイル部品 - Google Patents

磁心用粉末、それを用いた磁心及びコイル部品 Download PDF

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Publication number
WO2019208768A1
WO2019208768A1 PCT/JP2019/017934 JP2019017934W WO2019208768A1 WO 2019208768 A1 WO2019208768 A1 WO 2019208768A1 JP 2019017934 W JP2019017934 W JP 2019017934W WO 2019208768 A1 WO2019208768 A1 WO 2019208768A1
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Prior art keywords
magnetic core
powder
fesi
crystal
magnetic
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Application number
PCT/JP2019/017934
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English (en)
French (fr)
Japanese (ja)
Inventor
加藤　哲朗
千綿　伸彦
元基 太田
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日立金属株式会社
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Priority to JP2019547333A priority Critical patent/JP6673536B1/ja
Priority to CN201980028557.7A priority patent/CN112105472B/zh
Publication of WO2019208768A1 publication Critical patent/WO2019208768A1/ja

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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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • 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
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • 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

Definitions

  • Switching power supplies are EVs (electric vehicles), HEVs (hybrid vehicles), PHEVs (plug-in hybrid vehicles), mobile communication devices (cell phones, smartphones, etc.), personal computers, servers, etc. It is used in the power supply circuit of equipment, and it has been required to be low in power consumption from the viewpoint of energy saving along with reduction in size and weight.
  • powders of metallic soft magnetic materials such as iron, Fe-Si, and Fe-Si-Cr are employed.
  • the powder of the soft magnetic material a granular powder obtained by an atomizing method, which hardly causes shape anisotropy of magnetic characteristics when formed into a magnetic core and has good flowability of the powder in forming the magnetic core, is preferably used.
  • the high-speed combustion flame atomization method is particularly suitable for producing nanocrystalline alloy particles having a columnar structure.
  • the high-speed combustion flame atomization method is not as common as other atomization methods, it is described in, for example, JP-A-2014-136807.
  • the molten metal is powdered by a high-speed combustion flame by a high-speed combustor, and is cooled by a rapid cooling mechanism having a plurality of cooling nozzles capable of injecting a cooling medium such as liquid nitrogen and liquefied carbon dioxide.
  • the particles obtained by the atomization method are nearly spherical, and the cooling rate greatly depends on the particle size.
  • a liquid or gas for example, water, He or water vapor
  • the surface is cooled at a high cooling rate.
  • heat is efficiently removed from the surface, the inside is also cooled according to heat conduction, but the cooling rate varies, and a volume difference occurs between the surface layer portion that hardens first and the central portion that hardens later.
  • the variation in cooling rate becomes more prominent.
  • the powder for magnetic core of the present invention may be prepared by mixing a nanocrystalline alloy powder having a granular structure and / or a powder of another soft magnetic material prepared in advance with a nanocrystalline alloy powder having a columnar structure, and may be crystallized.
  • a powder obtained by mixing a powder that later becomes a nanocrystalline alloy having a granular structure and a nanocrystalline alloy powder having a columnar structure may be heat-treated for crystallization.
  • the heat treatment for crystallization is performed to obtain a nanocrystalline alloy having a granular structure.
  • the heat treatment temperature is 350 to 450 ° C., preferably 390 to 430 ° C., although it depends on the crystallization temperature of the nanocrystalline alloy that forms the granular structure.
  • the heat treatment temperature is the maximum temperature reached after the temperature rise, and is also the holding temperature when the temperature is held for a predetermined time.
  • Cu is an element that refines the alloy structure after crystallization and contributes to the formation of columnar FeSi crystals. It is also an element that contributes to the formation of a granular structure.
  • the Cu content is preferably 0.8% or more and 2.0% or less in atomic%. If the Cu content is low, the effect of addition cannot be obtained, while if it is high, the saturation magnetic flux density decreases.
  • Cu is excessive, crystallization in the cooling process proceeds too much, so the residual amorphous phase that has the effect of suppressing crystal grain growth is deficient, and Fe 2 B has high crystal grain coarsening and high magnetic anisotropy. Precipitation is likely to occur, and soft magnetic properties may be deteriorated.
  • the Cr is preferably 2.0% or less (including 0) in atomic%. Although not essential for obtaining a columnar-structured FeSi crystal, it is an effective element for improving the corrosion resistance of a nanocrystalline alloy.
  • the Cr content is preferably 0.1% or more, and more preferably 0.3% or more, in order to obtain the effect of preventing the inside from being oxidized.
  • the upper limit of Cr content is more preferably 1.5%. 1.1% is most preferred.
  • Fe is a main element constituting a nanocrystalline alloy and affects magnetic properties such as saturation magnetization. Although depending on the balance with other non-ferrous metals, it is preferable to contain 77.0% or more of Fe in atomic%, whereby a nanocrystalline alloy having a large saturation magnetization can be obtained.
  • the Fe content is more preferably 77.5% or more, further preferably 78.0% or more, and most preferably 79.0% or more.
  • the Fe-based amorphous alloy, the pure crystalline iron, Fe-Si, and Fe-Si-Cr crystalline materials are added to the nanocrystalline alloy powder in which the FeSi crystal forms a columnar structure.
  • Other soft magnetic powders such as metallic soft magnetic material powders may be added.
  • composition A Fe bal. Cu 1.2 Si 4.0 B 15.5 Cr 1.0 Sn 0.2 C 0.2
  • Composition B Fe bal. Cu 1.0 Si 13.5 B 11.0 Nb 3.0 Cr 1.0
  • the atomizing device used is capable of injecting a frame jet toward a container for storing molten metal, a pouring nozzle provided at the center of the bottom of the container and communicating with the inside of the container, and toward the molten metal flowing downward from the pouring nozzle.
  • a jet burner manufactured by Hard Industry Co., Ltd.
  • a cooling means for cooling the crushed molten metal are provided.
  • the flame jet is configured to pulverize molten metal to form molten metal powder, and each jet burner is configured to inject a flame as a flame jet at a supersonic speed or a speed close to the sonic speed.
  • the cooling means has a plurality of cooling nozzles configured to be able to inject a cooling medium toward the crushed molten metal.
  • the cooling medium water, liquid nitrogen, liquefied carbon dioxide, or the like can be used.
  • the temperature of the flame jet to be injected was 1300 ° C, and the dripping speed of the molten metal as a raw material was 5 kg / min. Water was used as a cooling medium, and a liquid mist was sprayed from the cooling nozzle. The cooling rate of the molten metal was adjusted from 4.5 liters / min to 7.5 liters / min.
  • the X-ray diffraction intensity measurement conditions were X-ray Cu-K ⁇ , applied voltage 40 kV, current 100 mA, divergence slit 1 °, scattering slit 1 °, light-receiving slit 0.3 mm, scanning continuously, scanning speed 2 ° / min.
  • the scanning step was 0.02 ° and the scanning range was 20 to 60 °.
  • the diffraction peak of the bcc structure FeSi crystal and the bcc structure are found in two types of magnetic core powders (No.1 and No.2 powders) with different average particle sizes of the A composition.
  • the diffraction peak of the Fe 2 B crystal was confirmed, but only one halo pattern was observed for one type of magnetic core powder (No. * 3 powder) of B composition, and the diffraction peak of the FeSi crystal and Fe 2 B crystal was It was not confirmed.
  • a TEM observation confirmed a striped structure in which linear FeSi crystals continued at intervals in the two types of powders of A composition. This structure was also observed in the powder after heat treatment described later.
  • FeSi crystals were linearly formed in any region and looked like stripes or dots in the direction of appearance on the observation surface. That is, each grain has a region in which the FeSi crystal group extends in different directions, and in each region, the FeSi crystal has a columnar structure in which crystals are precipitated in almost one direction. In this single region, the linear FeSi crystal has a uniform elongation direction, but the FeSi crystal has a different elongation direction in each region, and the linear FeSi crystal becomes discontinuous between adjacent regions. As a whole, the particles had a regular structure.
  • the magnetic core powders No. 1 and No. 2 are powders in which a nanocrystalline alloy powder having a granular structure and a nanocrystalline alloy powder having a columnar structure are mixed.
  • the No. * 3 powder in the reference example does not have a nanocrystalline alloy powder having a columnar structure, but is a nanocrystalline alloy powder having a conventional granular structure.
  • the FeSi crystal peak and the Fe 2 B crystal peak were confirmed in both No. 1 and No. 2 powders of the alloy composition A (after heat treatment). In the alloy composition B No. * 3 powder (after heat treatment), the FeSi crystal peak was confirmed, but the Fe 2 B crystal peak was not confirmed.
  • the ratio P2 / P1 of the peak intensity P2 of the Fe 2 B crystal to the peak intensity P1 of the FeSi crystal was smaller in the No. 2 powder having a small particle size distribution as a whole. Also, the coercive force of the No. 2 powder was smaller.
  • the magnetic cores using the No. 1 and No. 2 magnetic core powders of the present invention had a sufficiently small change in permeability regardless of the current change, and were able to exhibit stable DC superposition characteristics at a substantially constant value.
  • the magnetic core using the No. 2 magnetic core powder having a small peak intensity ratio P2 / P1 has a small magnetic core loss and a high initial permeability. If the magnetic permeability is low, it is necessary to increase the cross-sectional area of the magnetic core and increase the number of turns of the winding in order to obtain the required inductance, and as a result, the outer shape of the coil component becomes large. Therefore, it can be seen that the No. 2 powder is more advantageous in reducing the size of the coil component.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
PCT/JP2019/017934 2018-04-27 2019-04-26 磁心用粉末、それを用いた磁心及びコイル部品 WO2019208768A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019547333A JP6673536B1 (ja) 2018-04-27 2019-04-26 磁心用粉末、それを用いた磁心及びコイル部品
CN201980028557.7A CN112105472B (zh) 2018-04-27 2019-04-26 磁芯用粉末、使用其的磁芯和线圈部件

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018086307 2018-04-27
JP2018-086307 2018-04-27

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WO2019208768A1 true WO2019208768A1 (ja) 2019-10-31

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JP (2) JP6673536B1 (zh)
CN (1) CN112105472B (zh)
WO (1) WO2019208768A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11827962B2 (en) 2020-03-30 2023-11-28 Tdk Corporation Soft magnetic alloy, magnetic core, magnetic component, and electronic device

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KR20220148952A (ko) 2021-04-26 2022-11-07 가꼬우 호징 관세이 가쿠잉 다환 방향족 화합물
CN115703803A (zh) 2021-08-11 2023-02-17 学校法人关西学院 多环芳香族化合物、有机器件用材料、有机电致发光元件、显示装置及照明装置
KR20230034895A (ko) 2021-09-03 2023-03-10 가꼬우 호징 관세이 가쿠잉 다환 방향족 화합물
KR20230043732A (ko) 2021-09-24 2023-03-31 가꼬우 호징 관세이 가쿠잉 다환 방향족 화합물

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014125675A (ja) * 2012-12-27 2014-07-07 Hitachi Metals Ltd ナノ結晶軟磁性合金及びこれを用いた磁性部品
WO2015008813A1 (ja) * 2013-07-17 2015-01-22 日立金属株式会社 圧粉磁心、これを用いたコイル部品および圧粉磁心の製造方法
JP2016027656A (ja) * 2015-09-03 2016-02-18 日立金属株式会社 圧粉磁心の製造方法
JP2017095773A (ja) * 2015-11-25 2017-06-01 セイコーエプソン株式会社 軟磁性粉末、圧粉磁心、磁性素子および電子機器
JP2017145442A (ja) * 2016-02-16 2017-08-24 ハード工業有限会社 金属粉末製造装置

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JP5445889B2 (ja) * 2005-09-16 2014-03-19 日立金属株式会社 軟磁性合金、その製造方法、ならびに磁性部品
WO2013108735A1 (ja) * 2012-01-18 2013-07-25 日立金属株式会社 圧粉磁心、コイル部品および圧粉磁心の製造方法
TWI644330B (zh) * 2014-03-13 2018-12-11 日商日立金屬股份有限公司 磁心、線圈部件及磁心的製造方法
WO2017022594A1 (ja) * 2015-07-31 2017-02-09 株式会社村田製作所 軟磁性材料およびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014125675A (ja) * 2012-12-27 2014-07-07 Hitachi Metals Ltd ナノ結晶軟磁性合金及びこれを用いた磁性部品
WO2015008813A1 (ja) * 2013-07-17 2015-01-22 日立金属株式会社 圧粉磁心、これを用いたコイル部品および圧粉磁心の製造方法
JP2016027656A (ja) * 2015-09-03 2016-02-18 日立金属株式会社 圧粉磁心の製造方法
JP2017095773A (ja) * 2015-11-25 2017-06-01 セイコーエプソン株式会社 軟磁性粉末、圧粉磁心、磁性素子および電子機器
JP2017145442A (ja) * 2016-02-16 2017-08-24 ハード工業有限会社 金属粉末製造装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11827962B2 (en) 2020-03-30 2023-11-28 Tdk Corporation Soft magnetic alloy, magnetic core, magnetic component, and electronic device

Also Published As

Publication number Publication date
CN112105472B (zh) 2023-04-18
JPWO2019208768A1 (ja) 2020-04-30
JP6673536B1 (ja) 2020-03-25
CN112105472A (zh) 2020-12-18
JP2020111830A (ja) 2020-07-27
JP7236622B2 (ja) 2023-03-10

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