JPWO2017179349A1 - 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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- 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
- 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
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- H10N60/00—Superconducting devices
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- H10N60/0856—Manufacture or treatment of devices comprising metal borides, e.g. MgB2
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- H—ELECTRICITY
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- H10N60/00—Superconducting devices
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- 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
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- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- 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
Abstract
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、MM熱処理前(熱処理前の試料),MM600℃3h(熱処理後の試料),MM-CR熱処理前(熱処理前の試料),MM-CR600℃3h(熱処理後の試料)の縦断面の二次電子像と反射電子像を示す。に試料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。
上から順に、MM熱処理前(熱処理前の試料),MM600℃3h(熱処理後の試料),MM-CR熱処理前(熱処理前の試料),MM-CR600℃3h(熱処理後の試料)の縦断面の二次電子像と反射電子像を示す。に試料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 (10)
- 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後に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7.5at%未満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、
前記混合工程における衝撃を粉末に与える方法はメカニカルミリング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4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、
回転する複数の加工治具の間に前記混合粉末が充填された前記金属管を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乃至4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、
前記縮径工程において、
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。 - MgB2フィラメントと外層金属材とからなるMgB2超伝導線材であって、
前記MgB2フィラメントの領域において長さが10μmより大きい空隙が占める面積割合が5%以下であり、
円相当径が20nmより大きな空隙に対する個数基準分布のメディアン径が100nmより小さいことを特徴とするMgB2超伝導線材。 - 請求項7に記載のMgB2超伝導線材であって、
前記MgB2フィラメントを複数有し、
前記MgB2フィラメントの周囲には、鉄、ニオブ、タンタルまたはチタンを主成分とするバリア材が配置され、
前記複数のMgB2フィラメントが前記バリア材を介して繋がっており、
前記バリア材料の外周には、銅で構成する銅層を有し、
前記銅層の外周には、銅よりビッカース硬さの高い材料で構成する外被材を有することを特徴とするMgB2超伝導線材。 - 請求項1乃至8のいずれか一項に記載のMgB2超伝導線材を含む超伝導コイル。
- 請求項9に記載の超伝導コイルと、被検体からの核磁気共鳴信号を解析する解析手段とを備えたことを特徴とするMRI。
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KR102478700B1 (ko) * | 2021-12-30 | 2022-12-19 | 강원대학교산학협력단 | 임계전류밀도 특성이 향상된 In-situ 이붕화 마그네슘 초전도 선재의 제조방법 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003217369A (ja) * | 2002-01-25 | 2003-07-31 | Hitachi Cable Ltd | 二ホウ化マグネシウム超電導線材の製造方法 |
JP2006107841A (ja) * | 2004-10-01 | 2006-04-20 | National Institute For Materials Science | 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 |
JP2007059261A (ja) * | 2005-08-25 | 2007-03-08 | National Institute For Materials Science | MgB2超電導体とその線材並びにそれらの製造方法 |
JP2012014912A (ja) * | 2010-06-30 | 2012-01-19 | Hitachi Ltd | MgB2超電導線材の製造方法およびMgB2超電導線材 |
WO2015087387A1 (ja) * | 2013-12-10 | 2015-06-18 | 株式会社日立製作所 | MgB2超電導線材およびその製造方法 |
WO2015093475A1 (ja) * | 2013-12-17 | 2015-06-25 | 独立行政法人物質・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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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 |
EP2062302A4 (en) * | 2006-06-23 | 2012-11-28 | Univ Wollongong | SUPERCONDUCTIVE MATERIALS AND SYNTHESIS PROCESSES |
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JP2003217369A (ja) * | 2002-01-25 | 2003-07-31 | Hitachi Cable Ltd | 二ホウ化マグネシウム超電導線材の製造方法 |
JP2006107841A (ja) * | 2004-10-01 | 2006-04-20 | National Institute For Materials Science | 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 |
JP2007059261A (ja) * | 2005-08-25 | 2007-03-08 | National Institute For Materials Science | MgB2超電導体とその線材並びにそれらの製造方法 |
JP2012014912A (ja) * | 2010-06-30 | 2012-01-19 | Hitachi Ltd | MgB2超電導線材の製造方法およびMgB2超電導線材 |
WO2015087387A1 (ja) * | 2013-12-10 | 2015-06-18 | 株式会社日立製作所 | MgB2超電導線材およびその製造方法 |
WO2015093475A1 (ja) * | 2013-12-17 | 2015-06-25 | 独立行政法人物質・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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