JPH07105752A - Superconducting stranded wire and its manufacture - Google Patents
Superconducting stranded wire and its manufactureInfo
- Publication number
- JPH07105752A JPH07105752A JP5269748A JP26974893A JPH07105752A JP H07105752 A JPH07105752 A JP H07105752A JP 5269748 A JP5269748 A JP 5269748A JP 26974893 A JP26974893 A JP 26974893A JP H07105752 A JPH07105752 A JP H07105752A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- sulfide
- stranded wire
- core
- organic insulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 27
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 239000011593 sulfur Substances 0.000 claims abstract description 7
- 229910052979 sodium sulfide Inorganic materials 0.000 claims abstract description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000005987 sulfurization reaction Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- HYHCSLBZRBJJCH-UHFFFAOYSA-N sodium polysulfide Chemical compound [Na+].S HYHCSLBZRBJJCH-UHFFFAOYSA-N 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 8
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 238000002791 soaking Methods 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000000748 compression moulding Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920001021 polysulfide Polymers 0.000 description 2
- 239000005077 polysulfide Substances 0.000 description 2
- 150000008117 polysulfides Polymers 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- YHTRPKNLTPTPFX-UHFFFAOYSA-N CCCCCC.[S] Chemical compound CCCCCC.[S] YHTRPKNLTPTPFX-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、超電導素線間が良好に
絶縁された超電導成形撚線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting molded stranded wire having excellent insulation between superconducting wires.
【０００２】[0002]
【従来の技術】超電導成形撚線は、安定化材となす金属
マトリックス中に１〜50μｍφのＮｂＴｉ等の超電導フ
ィラメントを複合した超電導素線を多数本撚合わせ、圧
縮成形したもので、その断面形状は巻線加工に適した矩
形又は楔型である。このような超電導成形撚線は、素粒
子研究用大型加速器、産業用小型加速器（ＳＯＲ、医療
用）、ウイグラーマグネット、アンジェレーター、又は
発電機等の導体として実用されつつあり、更に高密度・
大電流化に向けて開発が進められている。この超電導成
形撚線のパッキングファクター（成形撚線全体に占める
超電導素線の断面積比率）は70〜95％と高く、従って素
線同士が局部的に接触した状態にある。この状態で超電
導成形撚線に交流磁場が印加された場合、素線間で構成
される閉回路に交流磁界によって誘起される電流が流れ
て結合損失（ジュール損失）が起きる。この結合損失に
より超電導状態を維持する冷媒のヘリウムの蒸発量が増
え、場合によっては常電動状態に転移する事故につなが
る恐れがあった。このようなことから、この種の超電導
成形撚線では、超電導素線表面にホルマールやポリイミ
ド等の有機皮膜を５〜20μｍ厚さに形成して絶縁してい
た。2. Description of the Related Art A superconducting molded stranded wire is formed by twisting and compressing a plurality of superconducting element wires in which a superconducting filament of NbTi or the like having a diameter of 1 to 50 μm is compounded in a metal matrix used as a stabilizer. Is a rectangular or wedge type suitable for winding processing. Such a superconducting molded stranded wire is being practically used as a conductor for a large accelerator for particle research, a small industrial accelerator (SOR, medical), a wiggler magnet, an angelator, a generator, etc.
Development is progressing toward higher current. The packing factor of this superconducting molded stranded wire (the cross-sectional area ratio of the superconducting wire to the entire molded stranded wire) is as high as 70 to 95%, and therefore the wires are in local contact with each other. When an AC magnetic field is applied to the superconducting molded stranded wire in this state, a current induced by the AC magnetic field flows in a closed circuit formed between the strands to cause coupling loss (Joule loss). Due to this coupling loss, the amount of evaporation of helium, which is a refrigerant that maintains the superconducting state, increases, which may lead to an accident in which the state changes to the normal electric state. For this reason, in this type of superconducting molded stranded wire, an organic film such as formal or polyimide is formed on the surface of the superconducting element wire in a thickness of 5 to 20 [mu] m for insulation.
【０００３】[0003]
【発明が解決しようとする課題】表面に有機絶縁皮膜を
形成した超電導素線を撚合わせ圧縮成形する際、超電導
素線同士が交差する部分の有機絶縁皮膜が圧縮力により
破壊することがあった。有機絶縁皮膜を厚くして破壊を
防止するのは、超電導成形撚線のパッキングファクター
を低下させ、高密度・大電流化の開発動向に逆行し好ま
しくなかった。When a superconducting element wire having an organic insulating film formed on its surface is twisted and compression-molded, the organic insulating film at the portion where the superconducting element wires intersect with each other may be destroyed by the compressive force. . It is not preferable to increase the thickness of the organic insulating film to prevent the breakdown because it reduces the packing factor of the superconducting molded stranded wire and goes against the development trend of high density and large current.
【０００４】そこで、圧縮成形後に酸化処理を施して、
露出した金属マトリックス部分を酸化絶縁する方法が提
案された。しかしながら、酸化処理を、強アルカリ浴
中、又はＮＨ3 やＮＯx 等の酸化性雰囲気中で行う為、
有機絶縁皮膜が劣化してその機械的性質が低下するとい
う問題があった。Therefore, after compression molding, oxidation treatment is applied to
A method has been proposed for oxidatively insulating exposed metal matrix portions. However, since the oxidation treatment is performed in a strong alkaline bath or in an oxidizing atmosphere such as NH 3 or NO x ,
There is a problem that the organic insulating film deteriorates and its mechanical properties deteriorate.
【０００５】[0005]
【課題を解決するための手段】本発明は、このような状
況に鑑み鋭意研究を重ねてなされたもので、超電導素線
間が良好に絶縁された超電導成形撚線の提供を目的とす
る。即ち、請求項１の発明は、多数本の単芯又は多芯超
電導素線を撚合わせ、成形した超電導成形撚線におい
て、前記単芯又は多芯超電導素線の表面が有機絶縁皮膜
又は硫化物皮膜により絶縁されていることを特徴とする
ものである。DISCLOSURE OF THE INVENTION The present invention has been made through intensive studies in view of such a situation, and an object thereof is to provide a superconducting molded stranded wire in which the superconducting element wires are well insulated from each other. That is, the invention of claim 1 is a superconducting molded stranded wire formed by twisting and molding a large number of single-core or multi-core superconducting element wires, wherein the surface of the single-core or multi-core superconducting element wires is an organic insulating film or a sulfide. It is characterized by being insulated by a film.
【０００６】この発明において、超電導素線の表面に施
す有機絶縁皮膜には、ポリイミド、ポリビニルホルマー
ル等が用いられる。硫化物皮膜は超電導素線を構成する
金属マトリックスの硫化物であり、ＣｕＳ等である。In the present invention, polyimide, polyvinyl formal or the like is used for the organic insulating film applied to the surface of the superconducting element wire. The sulfide film is a sulfide of a metal matrix that constitutes the superconducting element wire, and is CuS or the like.
【０００７】請求項２の発明は前記超電導成形撚線の製
造方法であり、その構成は、表面に有機絶縁皮膜を形成
した、多数本の単芯又は多芯超電導素線を撚合わせ、次
いで所定の形状に圧縮成形したのち、硫化処理を施すこ
とを特徴とする。A second aspect of the present invention is a method for producing the superconducting molded stranded wire, which has a structure in which a large number of single-core or multi-core superconducting element wires having an organic insulating film formed on the surface are twisted and then predetermined. It is characterized in that after being compression-molded into the shape of 1, the sulfurating treatment is applied.
【０００８】硫化処理は、相対湿度80％以上、温度40
℃以上の硫化水素雰囲気中に保持する方法、硫化ナト
リウムと硫黄を溶解した水溶液（多硫化ソーダ水溶液）
に浸漬する方法、硫黄を溶解したヘキサン溶液に浸漬
する方法、のいずれかが密着性に優れた硫化物皮膜を迅
速に形成できて好ましい。他の方法でも差支えない。Sulfurization is performed at a relative humidity of 80% or more and a temperature of 40%.
Method of holding in hydrogen sulfide atmosphere above ℃, aqueous solution of sodium sulfide and sulfur (sodium polysulfide solution)
The method of immersing the sulfide film in a hexane solution or the method of immersing it in a hexane solution in which sulfur is dissolved is preferable because a sulfide film having excellent adhesion can be rapidly formed. Other methods are acceptable.
【０００９】硫化物皮膜は、硫化水素雰囲気中の硫化水
素、又は多硫化ソーダ水溶液或いは硫黄−有機溶媒中の
硫黄成分が、超電導素線間の極めて微細な間隙に毛管現
象により侵入し、露出したマトリックス金属上に形成さ
れる。硫化水素雰囲気中に保持する硫化処理方法では、
相対湿度80〜90％、温度40〜80℃、処理時間12時間以上
で 500Å以上の硫化物皮膜が形成される。In the sulfide film, hydrogen sulfide in a hydrogen sulfide atmosphere, or an aqueous solution of sodium polysulfide or a sulfur component in a sulfur-organic solvent penetrates into an extremely fine gap between superconducting wires by a capillary phenomenon and is exposed. It is formed on the matrix metal. In the sulfurization treatment method of holding in a hydrogen sulfide atmosphere,
Relative humidity 80 to 90%, temperature 40 to 80 ℃, treatment time 12 hours or more, a sulfide film of 500 Å or more is formed.
【００１０】[0010]
【作用】本発明では、超電導成形撚線を構成する単芯又
は多芯超電導素線の表面が有機絶縁皮膜又は硫化物皮膜
により絶縁されているので、交流で使用した時の結合損
失が抑制できる。強加工の圧縮成形後に硫化物皮膜を形
成するので、硫化物皮膜が外力を受けて損傷することが
ない。硫化物皮膜形成に必要な雰囲気又は水溶液は、有
機絶縁皮膜を劣化させることがない。In the present invention, the surface of the single-core or multi-core superconducting element wire forming the superconducting molded stranded wire is insulated by the organic insulating film or the sulfide film, so that the coupling loss when used in an alternating current can be suppressed. . Since the sulfide film is formed after the compression molding of the strong work, the sulfide film is not damaged by an external force. The atmosphere or aqueous solution required for forming the sulfide film does not deteriorate the organic insulating film.
【００１１】[0011]
【実施例】以下に本発明を実施例により詳細に説明す
る。 実施例１ 表面にポリビニルホルマールの有機絶縁皮膜を形成した
銅安定化多芯超電導素線を77本撚合わせ、この撚線を断
面矩形に圧縮成形した。次にこの成形撚線を硫化水素雰
囲気中に12時間保持した。前記雰囲気の相対湿度と温度
は種々に変化させた。得られた超電導成形撚線につい
て、超電導素線間の接触抵抗を測定した。結果を硫化物
皮膜厚さを併記して表１に示した。尚、硫化物皮膜厚さ
はカソード還元法により測定した。EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 Seventy-seven copper-stabilized multicore superconducting wires having an organic insulating film of polyvinyl formal formed on the surface were twisted together, and the twisted wires were compression-molded into a rectangular cross section. Next, this molded stranded wire was kept in a hydrogen sulfide atmosphere for 12 hours. The relative humidity and temperature of the atmosphere were variously changed. The contact resistance between the superconducting element wires of the obtained superconducting molded stranded wire was measured. The results are shown in Table 1 together with the sulfide film thickness. The sulfide film thickness was measured by the cathode reduction method.
【００１２】[0012]
【表１】 [Table 1]
【００１３】実施例２ 実施例１で用いた超電導成形撚線を多硫化水溶液中に１
分間浸漬した。多硫化水溶液のＳ濃度は0.55％（水100c
c にNa2Sを0.4gr,Ｓを0.18gr溶解。）とした。Example 2 The superconducting molded stranded wire used in Example 1 was placed in an aqueous polysulfide solution.
Soaked for a minute. The S concentration of the polysulfide aqueous solution is 0.55% (water 100c
Dissolve 0.4 gr of Na 2 S and 0.18 gr of S in c. ).
【００１４】実施例３ 実施例１で用いた超電導成形撚線を硫黄−ヘキサン溶液
に 150秒間浸漬した。硫黄濃度は0.5gr/リットルとし
た。Example 3 The superconducting molded stranded wire used in Example 1 was immersed in a sulfur-hexane solution for 150 seconds. The sulfur concentration was 0.5 gr / liter.
【００１５】得られた超電導成形撚線について接触抵抗
を測定した。比較の為有機絶縁皮膜を形成しただけのも
のについても同様の測定を行った。結果を硫化物皮膜厚
さを併記して表１に示した。The contact resistance of the obtained superconducting molded stranded wire was measured. For comparison, the same measurement was carried out for the case where only the organic insulating film was formed. The results are shown in Table 1 together with the sulfide film thickness.
【００１６】[0016]
【表２】 [Table 2]
【００１７】表１及び表２より明らかなように、本発明
例品（No１〜３、６、７）は、いずれも硫化物皮膜が厚
く、従って高い接触抵抗が得られた。これに対し、比較
例品のNo４，５は硫化物皮膜が薄く形成された為、No８
は撚線の圧縮成形時に有機絶縁皮膜が破壊して銅が露出
した為、いずれも接触抵抗が大幅に低下した。As is clear from Tables 1 and 2, the inventive products (Nos. 1 to 3, 6, and 7) all had a thick sulfide film, and thus high contact resistance was obtained. On the other hand, No. 8 of the comparative example products had No. 8 because the sulfide film was thinly formed.
Since the organic insulating film was broken and the copper was exposed during compression molding of the stranded wire, the contact resistance was significantly reduced in all cases.
【００１８】以上、金属マトリックスに銅を用いた場合
について説明したが、本発明は、金属マトリックスが銅
以外の場合に適用しても同様の効果が得られる。Although the case where copper is used as the metal matrix has been described above, the same effect can be obtained even when the present invention is applied when the metal matrix is other than copper.
【００１９】[0019]
【効果】以上述べたように、本発明の超電導成形撚線
は、超電導素線が有機絶縁皮膜又は硫化物皮膜により絶
縁されているので、交流で使用した時の結合損失を抑制
でき、又本発明方法では圧縮成形後硫化処理するので、
形成された硫化物が損傷せず、又有機絶縁皮膜も硫化物
と非反応性なので劣化せず、いずれも健全な状態で絶縁
がなされ、工業上顕著な効果を奏する。As described above, in the superconducting molded stranded wire of the present invention, since the superconducting element wire is insulated by the organic insulating film or the sulfide film, it is possible to suppress the coupling loss when used in an alternating current. In the method of the invention, since the sulfurization treatment after compression molding,
The formed sulfide is not damaged, and the organic insulating film is also non-reactive with the sulfide and therefore is not deteriorated. Insulation is performed in a sound state, and a remarkable industrial effect is achieved.
フロントページの続き (72)発明者 和田 克則 東京都千代田区丸の内２丁目６番１号 古 河電気工業株式会社内 (72)発明者 志賀 章二 東京都千代田区丸の内２丁目６番１号 古 河電気工業株式会社内Front page continuation (72) Inventor Katsunori Wada 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Shoji Shiga 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Industry Co., Ltd.
Claims (5)
わせ、成形した超電導成形撚線において、前記単芯又は
多芯超電導素線の表面が有機絶縁皮膜又は硫化物皮膜に
より絶縁されていることを特徴とする超電導成形撚線。1. A superconducting molded stranded wire formed by twisting and molding a large number of single-core or multi-core superconducting element wires, wherein the surface of the single-core or multi-core superconducting element wires is insulated by an organic insulating film or a sulfide film. A superconducting molded stranded wire characterized by being.
の単芯又は多芯超電導素線を撚合わせ、次いで所定の形
状に圧縮成形したのち、硫化処理を施すことを特徴とす
る超電導成形撚線の製造方法。2. A superconducting molding characterized in that a large number of single-core or multi-core superconducting element wires each having an organic insulating film formed on the surface are twisted together, compression-molded into a predetermined shape, and then subjected to sulfurization treatment. Manufacturing method of stranded wire.
水素雰囲気中に保持することにより硫化処理を施すこと
を特徴とする請求項２記載の超電導成形撚線の製造方
法。3. The method for producing a superconducting molded stranded wire according to claim 2, wherein the sulfide treatment is carried out by holding in a hydrogen sulfide atmosphere having a relative humidity of 80% or more and a temperature of 40 ° C. or more.
（多硫化ソーダ水溶液）に浸漬することにより硫化処理
を施すことを特徴とする請求項２記載の超電導成形撚線
の製造方法。4. The method for producing a superconducting molded stranded wire according to claim 2, wherein the sulfide treatment is carried out by immersing in an aqueous solution (sodium polysulfide aqueous solution) in which sodium sulfide and sulfur are dissolved.
により硫化処理を施すことを特徴とする請求項２記載の
超電導成形撚線の製造方法。5. The method for producing a superconducting molded stranded wire according to claim 2, wherein the sulfurization treatment is performed by immersing the organic solvent in which sulfur is dissolved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5269748A JPH07105752A (en) | 1993-09-30 | 1993-09-30 | Superconducting stranded wire and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5269748A JPH07105752A (en) | 1993-09-30 | 1993-09-30 | Superconducting stranded wire and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07105752A true JPH07105752A (en) | 1995-04-21 |
Family
ID=17476609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5269748A Pending JPH07105752A (en) | 1993-09-30 | 1993-09-30 | Superconducting stranded wire and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07105752A (en) |
-
1993
- 1993-09-30 JP JP5269748A patent/JPH07105752A/en active Pending
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