JP6941599B2 - MgB2超伝導線材の製造方法,超伝導コイル及びMRI - Google Patents
MgB2超伝導線材の製造方法,超伝導コイル及びMRI Download PDFInfo
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- JP6941599B2 JP6941599B2 JP2018511933A JP2018511933A JP6941599B2 JP 6941599 B2 JP6941599 B2 JP 6941599B2 JP 2018511933 A JP2018511933 A JP 2018511933A JP 2018511933 A JP2018511933 A JP 2018511933A JP 6941599 B2 JP6941599 B2 JP 6941599B2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
- G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/10—Multi-filaments embedded in normal conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/005—Methods and means for increasing the stored energy in superconductive coils by increments (flux pumps)
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0856—Manufacture or treatment of devices comprising metal borides, e.g. MgB2
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/20—Permanent superconducting devices
- H10N60/202—Permanent superconducting devices comprising metal borides, e.g. MgB2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
このようにPIT法を代表する製法であるin situ法とex situ法にはそれぞれ課題があり,これらの製法は必ずしも最良な方法であるとはいえない。一方,マグネシウム粉末とホウ素粉末に対して遊星ボールミル装置を用いて混合することで,粉末の反応性を高める試みがなされている。以下ではこの方法をメカニカルアロイング法,またはメカニカルミリング法と呼ぶ。これらの方法では,熱処理をせずに混合だけでMgB2が一部生成し,このように一部MgB2の生成が起きたマグネシウムとホウ素の混合粉末を用いて合成したMgB2では高い電流密度を得られるという報告がある(例えば,非特許文献3,4,5,特許文献1)。
上から順に、MMCO-CR(熱処理前後),MMST-CRの縦断面の二次電子像と反射電子像を示す。熱処理前の試料MMCO-CRでは,試料MM-CRと比較して,メカニカルミリングによる混合体の粉末粒子が線材長手方向に引き延ばされており,空隙は殆ど認められない。この結果,熱処理後も極めて緻密な微細組織となっている。また,試料MMST-CRも同様に,その微細組織は極めて緻密である。
Claims (4)
- マグネシウム粉末とホウ素粉末に固体有機化合物を添加した状態でメカニカルミリング法により衝撃を粉末に与えてマグネシウム粒子の内部にホウ素粒子が分散した混合体を作製する混合工程と、
前記混合体を金属管に充填粉末として充填する充填工程と、
前記混合体を充填した金属管を加工して線材にする伸線工程と、
前記線材を熱処理してMgB2を合成する熱処理工程と、を有し、
前記固体有機化合物の添加量が、ホウ素に対する炭素の配合比率として0.1at%以上7.5at%未満であり、
前記充填工程における前記充填された混合体の充填粉末が、前記固体有機化合物を添加しない状態でのマグネシウムのマトリクスにホウ素が分散したメカニカルミリング法による充填粉末と比較して変形しやすく、
前記伸線工程は、前記混合体が充填された前記金属管を引き抜き加工のあとに回転する複数の加工治具の間に通して前記金属管を縮径することを特徴とするMgB2超伝導線材の製造方法。 - 請求項1に記載のMgB2超伝導線材の製造方法であって、
前記固体有機化合物が、炭化水素、有機酸、または有機酸の金属塩であることを特徴とするMgB2超伝導線材の製造方法。 - 請求項1または2に記載のMgB2超伝導線材の製造方法であって、
前記伸線工程において、
前記引き抜き加工は、前記混合体が充填された前記金属管をダイスに空いたテーパー状の孔に試料を通して引き抜く方法であることを特徴とするMgB2超伝導線材の製造方法。 - 請求項1乃至3のいずれか一項に記載のMgB2超伝導線材の製造方法であって、
前記伸線工程において、
150℃以上500℃以下の温度で加熱しながら前記金属管を縮径することを特徴とするMgB2超伝導線材の製造方法。
Applications Claiming Priority (3)
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JP2016080720 | 2016-04-14 | ||
JP2016080720 | 2016-04-14 | ||
PCT/JP2017/009648 WO2017179349A1 (ja) | 2016-04-14 | 2017-03-10 | MgB2超伝導線材の製造方法,超伝導コイル及びMRI |
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JPWO2017179349A1 JPWO2017179349A1 (ja) | 2019-02-21 |
JP6941599B2 true JP6941599B2 (ja) | 2021-09-29 |
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JP2018511933A Active JP6941599B2 (ja) | 2016-04-14 | 2017-03-10 | MgB2超伝導線材の製造方法,超伝導コイル及びMRI |
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US (1) | US11562836B2 (ja) |
JP (1) | JP6941599B2 (ja) |
WO (1) | WO2017179349A1 (ja) |
Families Citing this family (2)
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JP7050507B2 (ja) | 2018-01-31 | 2022-04-08 | 株式会社日立製作所 | MgB2超伝導線材及びその製造方法 |
KR102478700B1 (ko) * | 2021-12-30 | 2022-12-19 | 강원대학교산학협력단 | 임계전류밀도 특성이 향상된 In-situ 이붕화 마그네슘 초전도 선재의 제조방법 |
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DE10114934A1 (de) | 2001-03-22 | 2002-09-26 | Dresden Ev Inst Festkoerper | Verfahren zur Herstellung von supraleitenden Drähten und Bändern auf Basis der Verbindung MgB¶2¶ |
JP3775304B2 (ja) | 2002-01-25 | 2006-05-17 | 日立電線株式会社 | 二ホウ化マグネシウム超電導線材の製造方法 |
JP4500901B2 (ja) * | 2004-10-01 | 2010-07-14 | 独立行政法人物質・材料研究機構 | 複合シースニホウ化マグネシウム超電導線材とその製造方法 |
JP2006127898A (ja) | 2004-10-28 | 2006-05-18 | Sumitomo Electric Ind Ltd | 焼結体、焼結体の製造方法、超電導線材、超電導機器、および超電導線材の製造方法 |
JP4954511B2 (ja) * | 2005-08-25 | 2012-06-20 | 独立行政法人物質・材料研究機構 | MgB2超電導体とその線材の製造方法 |
WO2007147219A1 (en) * | 2006-06-23 | 2007-12-27 | The University Of Wollongong | Superconducting materials and methods of synthesis |
JP5519430B2 (ja) * | 2010-06-30 | 2014-06-11 | 株式会社日立製作所 | MgB2超電導線材の製造方法 |
US10134508B2 (en) * | 2013-12-10 | 2018-11-20 | Hitachi, Ltd. | MgB2 superconductive wire material, and production method therefor |
JP6161034B2 (ja) * | 2013-12-17 | 2017-07-12 | 国立研究開発法人物質・材料研究機構 | MgB2超伝導体の製造方法およびMgB2超伝導体 |
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US20200090835A1 (en) | 2020-03-19 |
WO2017179349A1 (ja) | 2017-10-19 |
JPWO2017179349A1 (ja) | 2019-02-21 |
US11562836B2 (en) | 2023-01-24 |
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