JP7377703B2 - 超伝導線材、超伝導線材の製造方法およびmri装置 - Google Patents
超伝導線材、超伝導線材の製造方法およびmri装置 Download PDFInfo
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- JP7377703B2 JP7377703B2 JP2019235787A JP2019235787A JP7377703B2 JP 7377703 B2 JP7377703 B2 JP 7377703B2 JP 2019235787 A JP2019235787 A JP 2019235787A JP 2019235787 A JP2019235787 A JP 2019235787A JP 7377703 B2 JP7377703 B2 JP 7377703B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 30
- 239000000463 material Substances 0.000 claims description 162
- 229910052751 metal Inorganic materials 0.000 claims description 141
- 239000002184 metal Substances 0.000 claims description 141
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- 238000000034 method Methods 0.000 claims description 67
- 238000010438 heat treatment Methods 0.000 claims description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 40
- 239000002887 superconductor Substances 0.000 claims description 28
- 239000002131 composite material Substances 0.000 claims description 26
- 239000010949 copper Substances 0.000 claims description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 23
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 238000005491 wire drawing Methods 0.000 claims description 21
- 229910020073 MgB2 Inorganic materials 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 20
- 239000011812 mixed powder Substances 0.000 claims description 18
- 239000010955 niobium Substances 0.000 claims description 18
- 229910052758 niobium Inorganic materials 0.000 claims description 17
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 15
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 8
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- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910052715 tantalum Inorganic materials 0.000 claims description 7
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 238000005481 NMR spectroscopy Methods 0.000 description 4
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
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- 239000010931 gold Substances 0.000 description 3
- 239000001307 helium Substances 0.000 description 3
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
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- 239000007788 liquid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 3
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- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
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- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
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- KJSMVPYGGLPWOE-UHFFFAOYSA-N niobium tin Chemical compound [Nb].[Sn] KJSMVPYGGLPWOE-UHFFFAOYSA-N 0.000 description 1
- 229910000657 niobium-tin Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
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- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C23/00—Extruding metal; Impact extrusion
- B21C23/01—Extruding metal; Impact extrusion starting from material of particular form or shape, e.g. mechanically pre-treated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/042—Manufacture of coated wire or bars
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- 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
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
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- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/12—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of wires
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- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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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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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
- B22F2007/042—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal characterised by the layer forming method
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- B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
- B22F2302/05—Boride
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- B22—CASTING; POWDER METALLURGY
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- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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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
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Description
図1は、本発明の実施形態に係る超伝導線材を模式的に示す断面図である。
図1に示すように、本実施形態に係る超伝導線材10は、MgB2のフィラメント1と、フィラメント1と共にコアを形成する母材2と、コアを覆うシースを形成しており、フィラメント1に圧縮残留応力を付与するための高熱膨張金属3と、コアを覆うシースを形成しており、フィラメント1の超伝導を安定化させる安定化材4と、を備えている。
ε_pre-comp=(α_sheath-α_MgB2)×(T2-T1)・・・(I)
図2に示すように、変形例に係る超伝導線材11は、前記の超伝導線材10と同様に、MgB2のフィラメント1と、母材2と、高熱膨張金属3と、安定化材4と、を備えている。
次に、前記の超伝導線材の製造方法について説明する。なお、以下では、図1および図2に示すような多芯線構造である超伝導線材を、in situ法を用いて製造する方法を例として挙げる。
Je=F×Jc・・・(II)
なお、MgB2のフィラメントの臨界電流密度Jcは、製造過程における加工や熱処理によって左右される。
図3は、安定化材と一体化させた形態の超伝導線材を模式的に示す断面図である。
図3に示すように、MgB2のフィラメント1、母材2、高熱膨張金属3および安定化材4を備える超伝導線材10は、シースを形成する安定化材4の外側に、超伝導を安定化させる安定化部材6を一体的に備えることができる。
図4は、超伝導線材同士の接続部を模式的に示す斜視図である。
図4に示すように、MgB2のフィラメント1、母材2、高熱膨張金属3および安定化材4を備える超伝導線材10は、接続部となるMgB2を原料粉末の焼成で形成することにより、他の超伝導体と超伝導接続させることができる。超伝導線材10同士の超伝導接続に際しては、接続部となるMgB2を焼成するために金属容器20を用いることができる。
図5に示すように、超伝導線材10を別の超伝導線材10(他の超伝導体)と超伝導接続させた後、安定化材4等が除去された超伝導線材10の端部(図4参照)には、その超伝導線材10と接触するように、超伝導を安定化させる安定化部材26を付加することができる。
図6は、MRI装置の構成を示す図である。
図6に示すように、MRI装置300は、超伝導コイル100と、永久電流スイッチ108と、冷凍容器109と、傾斜磁場コイル111と、傾斜磁場用アンプ112と、RFアンテナ113と、RF送受信機114と、を備えている。
2 母材
3 高熱膨張金属
4 安定化材
5 結束材(管材)
6 安定化部材
10 超伝導線材
11 超伝導線材
20 金属容器
21 キャビティ
22 挿入口
23 開口
26 安定化部材
100 超伝導コイル
108 永久電流スイッチ
109 冷凍容器
111 傾斜磁場コイル
112 傾斜磁場用アンプ
113 RFアンテナ
114 RF送受信機
300 MRI装置
Claims (13)
- MgB2で形成されたフィラメントと、
前記フィラメントの外周を覆う母材と、
前記母材の外周を覆う高熱膨張金属と、
前記高熱膨張金属の外周を覆う超伝導を安定化させる安定化材と、を備え、
前記高熱膨張金属は、室温における熱膨張係数が前記MgB2および前記母材よりも高い金属であり、
前記母材は、鉄、ニオブ、タンタル、ニッケル、チタン、または、これらの合金であり、
前記高熱膨張金属は、ステンレス鋼である超伝導線材。 - 請求項1に記載の超伝導線材であって、
前記母材は、鉄またはニオブであり、
前記安定化材は、銅である超伝導線材。 - 請求項1に記載の超伝導線材であって、
外周が前記母材で覆われた複数の前記フィラメントを有する多芯線構造である超伝導線材。 - 請求項3に記載の超伝導線材であって、
前記母材と前記高熱膨張金属との間に、多芯化された前記母材を結束させる鉄またはニオブで形成された管材を備える超伝導線材。 - 請求項1に記載の超伝導線材であって、
前記安定化材の外側に、前記安定化材の外周の一部を覆う断面視で門型形状に設けられた超伝導を安定化させる安定化部材を備える超伝導線材。 - 請求項1に記載された超伝導線材であって、
前記超伝導線材の少なくとも一方の端部において、前記安定化材、または、前記高熱膨張金属と前記安定化材の両方が除去されており、
前記端部の前記フィラメントが、MgB2で形成された焼結体と一体化しており、前記焼結体を介して他の超伝導体と超伝導接続されている超伝導線材。 - 請求項6に記載の超伝導線材であって、
前記安定化材が除去された前記端部に、前記超伝導線材と接触するように、超伝導を安定化させる安定化部材が付加されている超伝導線材。 - マグネシウム粉末とホウ素粉末を混合した混合粉末を第1金属管に充填する工程と、
前記混合粉末が充填された前記第1金属管を伸線加工する工程と、
伸線加工された前記第1金属管を第2金属管に収納して複合素線を作製する工程と、
前記複合素線を伸線加工する工程と、
伸線加工された前記複合素線を熱処理してMgB2を生成させる工程と、を含み、
前記第1金属管は、超伝導線材の母材となる金属で形成されており、
前記第2金属管は、高熱膨張金属で形成された高熱膨張金属層と、前記高熱膨張金属層の外周を覆う超伝導を安定化させる安定化材で形成された安定化材層と、を有する複合管、または、高熱膨張金属で形成された高熱膨張金属管を、超伝導を安定化させる安定化材で形成された安定化材管に収納した多重管であり、
前記高熱膨張金属は、室温における熱膨張係数が前記MgB2および前記母材となる金属よりも高い金属であり、
前記母材となる金属は、鉄、ニオブ、タンタル、ニッケル、チタン、または、これらの合金であり、
前記高熱膨張金属は、ステンレス鋼である超伝導線材の製造方法。 - 請求項8に記載の超伝導線材の製造方法であって、
前記母材となる金属は、鉄またはニオブであり、
前記安定化材は、銅である超伝導線材の製造方法。 - 請求項8に記載の超伝導線材の製造方法であって、
前記熱処理の温度が、580~620℃である超伝導線材の製造方法。 - 請求項8に記載の超伝導線材の製造方法であって、
伸線加工された複数の前記第1金属管を前記第2金属管に収納して前記複合素線を作製する超伝導線材の製造方法。 - 請求項8に記載の超伝導線材の製造方法であって、
前記第2金属管は、前記複合管もしくは前記多重管の内側に、鉄またはニオブで形成された内層を有するか、または、鉄またはニオブで形成された内管を前記複合管もしくは前記多重管に収納している超伝導線材の製造方法。 - 請求項1から請求項7のいずれか一項に記載された超伝導線材を備えたMRI装置。
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