JP3032653B2 - Oxide high temperature superconductor current lead - Google Patents
Oxide high temperature superconductor current leadInfo
- Publication number
- JP3032653B2 JP3032653B2 JP4309639A JP30963992A JP3032653B2 JP 3032653 B2 JP3032653 B2 JP 3032653B2 JP 4309639 A JP4309639 A JP 4309639A JP 30963992 A JP30963992 A JP 30963992A JP 3032653 B2 JP3032653 B2 JP 3032653B2
- Authority
- JP
- Japan
- Prior art keywords
- current lead
- temperature superconductor
- oxide high
- electrode
- superconductor
- 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.)
- Expired - Fee Related
Links
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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、酸化物高温超電導体を
用いた電流リードに形成する電極部に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode portion formed on a current lead using an oxide high-temperature superconductor.
【０００２】[0002]
【従来の技術】酸化物超電導体を電流リード導体として
利用する際、外部と接続するために電極形成が不可欠で
ある。超電導体の抵抗がほぼゼロで作動させることが出
来るという特性を安定的に生かすため、接触抵抗が極め
て低く、ジュール熱を抑えた電極を形成する方法の改良
が重ねられている。2. Description of the Related Art When an oxide superconductor is used as a current lead conductor, formation of an electrode is indispensable for connection to the outside. In order to stably utilize the property that the superconductor can be operated with almost zero resistance, the method of forming an electrode with extremely low contact resistance and suppressed Joule heat has been repeatedly improved.
【０００３】従来、金、銀等の極低温下で抵抗が小さ
く、かつ、加熱によっても酸化物超電導体を変質させな
い金属材料を用いて電極形成が行われている。このよう
な金属の箔を酸化物超電導体に巻き付けて冷間静水圧加
圧等により圧着し、熱処理する方法が知られている。ま
たペースト状の金属材料を酸化物超電導体に塗布する方
法、粉末の金属材料を溶射する方法により金属の膜を形
成して熱処理する方法が考案されている。Conventionally, electrodes have been formed using a metal material such as gold or silver which has a low resistance at an extremely low temperature and does not deteriorate the oxide superconductor even when heated. A method is known in which such a metal foil is wound around an oxide superconductor, pressure-bonded by cold isostatic pressure or the like, and heat-treated. Further, a method of applying a paste-like metal material to an oxide superconductor, and a method of forming a metal film by thermal spraying a powdery metal material and performing a heat treatment have been devised.
【０００４】金属箔を圧着する方法は、接触抵抗に改善
が見られるものの、超電導体に対する密着性が悪く、電
極膜剥離を起こしやすい。ペースト状の金属材料を塗布
する方法は、充分な導電性が得られなかった。そのなか
で、銀粉末を溶射する方法は、超電導体と形成した電極
との接触抵抗をかなり低減することが可能な方法であ
る。[0004] In the method of press-bonding a metal foil, although the contact resistance is improved, the adhesion to the superconductor is poor and the electrode film is easily peeled. In the method of applying a paste-like metal material, sufficient conductivity was not obtained. Among them, the method of spraying silver powder is a method capable of considerably reducing the contact resistance between the superconductor and the formed electrode.
【０００５】円筒形状の超電導体を用いて、円筒内側に
電極を形成する場合、溶射法は利用できないため、テー
プあるいは管などの薄板材料を圧着している。When an electrode is formed inside a cylinder using a cylindrical superconductor, a thin plate material such as a tape or a tube is crimped because a thermal spraying method cannot be used.
【０００６】[0006]
【発明が解決しようとする課題】以上のように、低抵抗
で酸化物超電導体に対して化学的に安定な金属を用いて
電極を形成する方法としていろいろ試みられている。特
に銀粉末を溶射して電極を形成する方法は、電極膜と超
電導体との密着性が改善されている。As described above, various attempts have been made as a method of forming an electrode using a metal having a low resistance and being chemically stable to an oxide superconductor. Particularly, in the method of forming an electrode by spraying silver powder, the adhesion between the electrode film and the superconductor is improved.
【０００７】しかし、酸化物超電導体電流リードに大電
流を流して給電を行う際には、銀粉末を溶射して形成し
た電極であっても接触抵抗が不十分なことがある。単に
超電導体に溶射する方法では、形成された電極の特性に
ばらつきが大きく、接触抵抗に変動があることも一因で
ある。However, when supplying a large current to the oxide superconductor current lead to supply power, even if the electrode is formed by spraying silver powder, the contact resistance may be insufficient. In the method of simply spraying the superconductor, one factor is that the characteristics of the formed electrodes vary greatly and the contact resistance varies.
【０００８】超電導状態と常電導状態の間の昇降温の熱
サイクルの繰り返し、ハンダ付けによる熱サイクルによ
り、酸化物超電導体と銀との熱膨張率の差に起因する電
極膜剥離が起こる恐れがある。熱サイクルにより電極膜
に部分剥離が起こり、密着性、接触面積の低下が接触抵
抗の上昇を招く。それが、ジュール発熱の増加を引き起
こして剥離をさらに促進することとなる。[0008] The repetition of the thermal cycle of temperature rise and fall between the superconducting state and the normal conducting state, and the thermal cycle by soldering, may cause peeling of the electrode film due to the difference in thermal expansion coefficient between the oxide superconductor and silver. is there. Partial peeling occurs in the electrode film due to the heat cycle, and a decrease in adhesion and a contact area causes an increase in contact resistance. It causes an increase in Joule heat and further promotes exfoliation.
【０００９】円筒形状の超電導体は、他の形状に比べて
臨界電流密度が大きい特性を有し、外周とともに円筒内
側にも電極を形成し、接触面積の増加が図れるため、大
電流供給を行う電流リードに向いている。しかし、銀粉
末溶射法は、円筒内側の電極形成には利用できないた
め、円筒内側に設ける電極は、接触抵抗に問題が残って
いる。[0009] The cylindrical superconductor has a characteristic that the critical current density is larger than other shapes, and an electrode is formed on the inner side of the cylinder together with the outer periphery, so that the contact area can be increased. Suitable for current leads. However, since the silver powder spraying method cannot be used for forming an electrode inside the cylinder, the electrode provided inside the cylinder has a problem in contact resistance.
【００１０】本発明は、酸化物高温超電導体と金属電極
との接触抵抗を低減して、通電時の発熱を抑え、熱サイ
クルに耐久性のある電極部を得て酸化物高温超電導体電
流リードの性能の向上を図ることを目的とする。The present invention provides an oxide high-temperature superconductor current lead by reducing the contact resistance between an oxide high-temperature superconductor and a metal electrode, suppressing heat generation during energization, and obtaining an electrode portion that is durable in a heat cycle. The purpose is to improve the performance of the.
【００１１】[0011]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明では、酸化物高温超電導体に電極を形成す
る方法には、低接触抵抗を得られる銀粉末溶射法を採用
する。超電導体の被溶射面に適当な形状の溝を設けて、
表面積の増大と溶射材のアンカー効果の増大によって接
触抵抗を低減し、熱サイクルに起因する溶射材の剥離を
防止する。In order to solve the above-mentioned problems, the present invention employs a silver powder spraying method capable of obtaining a low contact resistance as a method of forming an electrode on an oxide high-temperature superconductor. By providing a groove of an appropriate shape on the sprayed surface of the superconductor,
The contact resistance is reduced by increasing the surface area and the anchor effect of the thermal sprayed material, and the thermal spray is prevented from peeling off the thermal sprayed material.
【００１２】溝を設けた部分では超電導体の断面積が減
少し、溝加工しないものと比較すると、機械的強度の低
下、あるいは通電電流の減少が認められる。そこで溝加
工する部分の肉厚を増し、断面積をリード全体で一定に
させる。[0012] The cross-sectional area of the superconductor is reduced in the portion where the groove is provided, and a decrease in mechanical strength or a decrease in current flow is observed as compared with the case where no groove is formed. Therefore, the thickness of the portion to be grooved is increased, and the cross-sectional area is made constant throughout the lead.
【００１３】円筒形状の超電導体を用いて、円筒内側に
電極を形成する場合は、薄肉銀管を用いて、電極材料の
密着面にネジ状の凹凸を設け、密着性を改善する。円筒
外側の電極と併用することにより、接触面積の増加を図
ることが出来る。When an electrode is formed inside a cylinder using a cylindrical superconductor, a thin silver tube is used to provide thread-like irregularities on the contact surface of the electrode material to improve the adhesion. By using it together with the electrode outside the cylinder, the contact area can be increased.
【００１４】図１に、本発明の酸化物高温超電導体電流
リードの一例の断面図を示す。酸化物高温超電導体に
は、高臨界電流密度特性が得られる薄肉円筒形状に成形
したＢｉ系酸化物の焼結体を用いて、両端に銀を溶射
し、銀溶射電極部を形成している。FIG. 1 is a sectional view showing an example of the oxide high-temperature superconductor current lead of the present invention. For the oxide high-temperature superconductor, silver is sprayed on both ends using a sintered body of a Bi-based oxide formed into a thin cylindrical shape capable of obtaining a high critical current density characteristic, thereby forming a silver sprayed electrode portion. .
【００１５】図２に、電流リードの溶射電極部の一例の
断面拡大図を示す。肉厚ｔBの超電導体の被溶射面に、
深さｔN、幅ＷNの溝を設ける。設ける溝は、Ｕ字状等、
溝の底が鋭いノッチにならない形状で、深さと超電導体
の肉厚との関係はｔN／ｔB＝＜０．８とし、溝の幅ＷN
は溶射金属粉末の粒径ＷDよりも充分大きいものとす
る。図２に示した例では、溝は一様の深さ、形状で設け
られている。FIG. 2 is an enlarged cross-sectional view of an example of the sprayed electrode portion of the current lead. To be sprayed surface of the superconductor of the wall thickness t B,
A groove having a depth t N and a width W N is provided. The groove to be provided is U-shaped, etc.
The bottom of the groove does not have a sharp notch, the relationship between the depth and the thickness of the superconductor is t N / t B = <0.8, and the width of the groove is W N
Shall is sufficiently larger than the particle size W D of sprayed metal powder. In the example shown in FIG. 2, the grooves are provided with a uniform depth and shape.
【００１６】図３に、電流リードの溶射電極部の他の一
例の断面拡大図を示す。この例では超電導体の端部から
長手軸方向に向かって、設ける溝の深さｔNを段階的に
浅くしている。一様の深さの溝を設ける場合と比較する
と、溝による超電導体の断面積の減少を抑制する効果が
ある。FIG. 3 is an enlarged cross-sectional view of another example of the sprayed electrode portion of the current lead. In this example towards the longitudinal axis from the end of the superconductor, and shallow stepwise depth t N of the grooves provided. Compared to the case where a groove having a uniform depth is provided, there is an effect of suppressing a decrease in the cross-sectional area of the superconductor due to the groove.
【００１７】図１から図３に示したように、薄肉円筒形
状の超電導体に溝加工をするだけでは、機械的強度の低
下がおこり、溝により超電導体の実質的な肉厚が小さく
なる。超電導体の断面積が減少するため、通電電流が減
少する。As shown in FIGS. 1 to 3, simply forming a groove in a thin cylindrical superconductor causes a decrease in mechanical strength, and the groove reduces the substantial thickness of the superconductor. Since the cross-sectional area of the superconductor is reduced, the flowing current is reduced.
【００１８】そこで、図４〜図５にあるように、超電導
体の被電極形成部の肉厚を、導体部分に比べて増し、溝
に奪われる超電導体の実質的な肉厚を補う。図４は本発
明の酸化物高温超電導体電流リードの他の一例の断面図
である。図５は、図４の電流リードの電極部の断面拡大
図である。図５の断面拡大図にあるように、酸化物高温
超電導体の電極部に、溝の深さｔN以上の大きさの肉厚
ｔTを増して、肉厚の増加分ｔT＞＝ｔNの深さの溝を設
ける。肉厚の増加分があるため、溝を加工しても、電極
部の断面積は、導体部分と変わらず、通電電流の減少が
抑えられる。Therefore, as shown in FIGS. 4 and 5, the thickness of the electrode-formed portion of the superconductor is increased as compared with the conductor portion to compensate for the substantial thickness of the superconductor taken away by the groove. FIG. 4 is a sectional view of another example of the oxide high-temperature superconductor current lead of the present invention. FIG. 5 is an enlarged cross-sectional view of the electrode portion of the current lead of FIG. As shown in the enlarged cross-sectional view of FIG. 5, the thickness of the electrode portion of the oxide high-temperature superconductor is increased by a thickness t T equal to or greater than the depth t N of the groove, and the increased thickness t T > = t A groove with a depth of N is provided. Since there is an increase in the wall thickness, even if the groove is processed, the cross-sectional area of the electrode portion is the same as that of the conductor portion, and a decrease in the current flow is suppressed.
【００１９】図４〜図５の超電導体のような肉厚を得る
方法としては、電極部に粉末を厚く充填して成形、焼結
する方法、厚肉品を作製してから、非電極部を機械加工
により切除して薄肉にする方法、あるいはドクターブレ
ード法等により作製した薄板を電極部に巻き付ける方法
等が考えられる。As a method for obtaining a wall thickness like the superconductor shown in FIGS. 4 and 5, a method of filling the electrode portion with a thick powder and molding and sintering, a method of producing a thick product, and a method of forming the non-electrode portion Can be conceived by machining to reduce the thickness, or a method of winding a thin plate produced by a doctor blade method or the like around the electrode portion.
【００２０】図６は、本発明の酸化物高温超電導体電流
リードの他の一例の断面図で、図７は、図６の電流リー
ドの電極部の断面拡大図である。電流リードに円筒形状
の酸化物超電導体を用いる場合、円筒内側に溶射法で電
極形成が出来ない。円筒内側に電極を形成する場合は、
銀テープあるいは薄肉銀管のような薄肉材料を用いてい
る。本発明では、薄肉銀管の外側の電極形成面にネジ状
や複数の輪状の凹凸を加工してから、密着させて電極部
とする。超電導体と電極の密着性が改善される。また、
円筒外周に設ける電極と円筒内側に設ける電極を併用す
ることにより、接触面積が倍になるため、接触抵抗が低
減し、電極部の発熱が抑えられる。FIG. 6 is a sectional view of another example of the oxide high-temperature superconductor current lead of the present invention, and FIG. 7 is an enlarged sectional view of an electrode portion of the current lead of FIG. When a cylindrical oxide superconductor is used for the current lead, electrodes cannot be formed on the inner side of the cylinder by thermal spraying. When forming an electrode inside the cylinder,
A thin material such as a silver tape or a thin silver tube is used. In the present invention, a screw-shaped or a plurality of ring-shaped irregularities are formed on the outer surface of the thin silver tube on which the electrode is formed, and then the electrodes are brought into close contact with each other to form an electrode portion. The adhesion between the superconductor and the electrode is improved. Also,
By using both the electrode provided on the outer periphery of the cylinder and the electrode provided on the inner side of the cylinder, the contact area is doubled, so that the contact resistance is reduced and the heat generation of the electrode portion is suppressed.
【００２１】[0021]
【発明の効果】上記のように本発明の酸化物高温超電導
体電流リードによれば、溶射法で形成される電極と超電
導体との密着性が改善する。超電導状態と常電導状態間
の昇降温の熱サイクルやハンダ付けの熱サイクルに対し
て、溝によるアンカー効果が強いため、溶射金属は剥離
しにくくなる。溶射法で形成した電極部に対し、液体窒
素温度７７Ｋで１０-8Ωｃｍ2の接触抵抗が、剥離や密
着性のばらつきもなく安定して得られる。As described above, according to the oxide high-temperature superconductor current lead of the present invention, the adhesion between the electrode formed by thermal spraying and the superconductor is improved. Since the groove has a strong anchor effect with respect to the thermal cycle of temperature rise and fall or the thermal cycle of soldering between the superconducting state and the normal conducting state, the sprayed metal is less likely to peel. A contact resistance of 10 −8 Ωcm 2 at a liquid nitrogen temperature of 77 K can be stably obtained without peeling or variations in adhesion with respect to the electrode portion formed by the thermal spraying method.
【００２２】溝を設けるにあたり、超電導体の電極形成
部の肉厚を増して対処することにより、実質的な断面積
の減少もなく、機械的強度の低下を抑えることが出来
る。By increasing the thickness of the electrode forming portion of the superconductor when providing the groove, it is possible to suppress a decrease in mechanical strength without a substantial decrease in cross-sectional area.
【００２３】円筒形状の超電導体に対して、円筒内側に
電極を形成する際も電極材に溝を設けることにより、超
電導体と電極との密着性が増す。円筒の外側、内側の両
方に密着性の優れた電極を形成することにより、接触面
積が増大し、接触抵抗を低減することが出来る。When a groove is formed in the electrode material even when an electrode is formed inside the cylinder with respect to the cylindrical superconductor, the adhesion between the superconductor and the electrode is increased. By forming electrodes having excellent adhesion both on the outside and inside of the cylinder, the contact area can be increased and the contact resistance can be reduced.
【００２４】本発明の酸化物高温超電導体電流リード
は、接触面積を大きくし、電極膜の剥離を抑止できるた
め、発熱を抑えて、通電電流を増し、熱サイクルや長期
間の断続使用の信頼性が向上する等の効果がある。Since the oxide high-temperature superconductor current lead of the present invention can increase the contact area and suppress the peeling of the electrode film, it suppresses heat generation, increases the conduction current, and improves the reliability of thermal cycling and long-term intermittent use. This has the effect of improving the performance.
【図１】本発明の酸化物高温超電導体電流リードの一例
の断面図である。FIG. 1 is a sectional view of an example of an oxide high-temperature superconductor current lead of the present invention.
【図２】本発明の酸化物高温超電導体電流リード電極部
の一例の断面拡大図である。FIG. 2 is an enlarged cross-sectional view of an example of the oxide high-temperature superconductor current lead electrode portion of the present invention.
【図３】本発明の酸化物高温超電導体電流リード電極部
の他の一例の断面拡大図である。FIG. 3 is an enlarged cross-sectional view of another example of the oxide high-temperature superconductor current lead electrode portion of the present invention.
【図４】本発明の酸化物高温超電導体電流リードの他の
一例の断面図である。FIG. 4 is a cross-sectional view of another example of the oxide high-temperature superconductor current lead of the present invention.
【図５】本発明の酸化物高温超電導体電流リード電極部
の他の一例の断面拡大図である。FIG. 5 is an enlarged cross-sectional view of another example of the oxide high-temperature superconductor current lead electrode portion of the present invention.
【図６】本発明の酸化物高温超電導体電流リードの他の
一例の断面図である。FIG. 6 is a cross-sectional view of another example of the oxide high-temperature superconductor current lead of the present invention.
【図７】本発明の酸化物高温超電導体電流リード電極部
の他の一例の断面拡大図である。FIG. 7 is an enlarged cross-sectional view of another example of the oxide high-temperature superconductor current lead electrode portion of the present invention.
１ 酸化物高温超電導体 ２ 銀溶射電極部 ３ 溝 ４ 薄肉銀管 DESCRIPTION OF SYMBOLS 1 Oxide high temperature superconductor 2 Silver spray electrode part 3 Groove 4 Thin silver tube
Claims (5)
リードにおいて、前記筒形状の酸化物高温超電導体の電
極形成面に底が鋭いノッチにならない形状の溝を設け、
前記溝を設けた電極形成面に銀溶射により電極部を形成
したことを特徴とする酸化物高温超電導体電流リード。1. An oxide high-temperature superconductor current lead having a cylindrical shape, wherein an electrode-forming surface of the cylindrical oxide high-temperature superconductor is provided with a groove having a shape that does not have a sharp notch at the bottom,
An oxide high-temperature superconductor current lead, wherein an electrode portion is formed by silver spraying on the electrode forming surface provided with the groove.
酸化物高温超電導体の非電極形成部の肉厚より前記溝の
深さ以上の厚さを有することを特徴とする請求項１記載
の酸化物高温超電導体電流リード。2. The method according to claim 1, wherein the thickness of the electrode forming surface portion is greater than the thickness of the non-electrode forming portion of the cylindrical oxide high-temperature superconductor by the depth of the groove or more. An oxide high temperature superconductor current lead as described.
幅が銀溶射用粉末の粒径以上であることを特徴とする請
求項１乃至２記載の酸化物高温超電導体電流リード。3. The oxide high-temperature superconductor current lead according to claim 1, wherein the groove is formed with a smooth surface, and the groove width is equal to or larger than the particle diameter of the powder for silver spraying.
ードの端部方向に向かう深度傾斜を備えていることを特
徴とする請求項１乃至３記載の酸化物高温超電導体電流
リード。4. The oxide high-temperature superconductor current lead according to claim 1, wherein the groove has a depth gradient toward an end of the oxide high-temperature superconductor current lead.
リードにおいて、少なくとも該筒形状を有する酸化物高
温超電導体電流リードの内側の電極形成面にネジ状ある
いは複数の輪状の溝を設け、銀薄肉材料を該電極形成面
に密着させた銀薄肉からなる電極を設けたことを特徴と
する酸化物高温超電導体電流リード。5. An oxide high-temperature superconductor current lead having a cylindrical shape, wherein a screw-shaped or a plurality of ring-shaped grooves are provided on at least an electrode forming surface inside the oxide high-temperature superconductor current lead having a cylindrical shape. An oxide high-temperature superconductor current lead provided with an electrode made of thin silver in which a thin material is adhered to the electrode forming surface.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4309639A JP3032653B2 (en) | 1992-10-23 | 1992-10-23 | Oxide high temperature superconductor current lead |
| US08/114,173 US5623240A (en) | 1992-10-20 | 1993-09-01 | Compact superconducting magnet system free from liquid helium |
| DE69324436T DE69324436T2 (en) | 1992-10-20 | 1993-09-30 | Compact superconducting magnet system without liquid helium |
| EP93115827A EP0596249B1 (en) | 1992-10-20 | 1993-09-30 | Compact superconducting magnet system free from liquid helium |
| EP97121654A EP0837478B1 (en) | 1992-10-20 | 1993-09-30 | Current lead for a superconducting magnet system free from liquid helium |
| DE69333128T DE69333128T2 (en) | 1992-10-20 | 1993-09-30 | Power supply line for superconducting magnet system without liquid helium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4309639A JP3032653B2 (en) | 1992-10-23 | 1992-10-23 | Oxide high temperature superconductor current lead |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06140234A JPH06140234A (en) | 1994-05-20 |
| JP3032653B2 true JP3032653B2 (en) | 2000-04-17 |
Family
ID=17995465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4309639A Expired - Fee Related JP3032653B2 (en) | 1992-10-20 | 1992-10-23 | Oxide high temperature superconductor current lead |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3032653B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602004014033D1 (en) * | 2004-03-31 | 2008-07-03 | Council Scient Ind Res | PROCESS FOR PRODUCING A CONTACT WITH LOW CONTACT RESISTANCE ON A SUPER CHARGER WITH HIGH TRANSITION TEMPERATURE |
| WO2007105226A1 (en) * | 2006-03-10 | 2007-09-20 | Concil Of Scientific & Industrial Research | Process for preparation of high temperature superconducting bulk current leads with improved properties and superconducting bulk current leads made thereby |
| JP4908566B2 (en) * | 2009-09-14 | 2012-04-04 | カウンシル オブ サイエンティフィク アンド インダストリアル リサーチ | Method for manufacturing low contact resistance contacts on high transition temperature superconductors |
| JP5686437B2 (en) * | 2011-04-27 | 2015-03-18 | 住友電気工業株式会社 | Oxide superconducting thin film wire and method for producing the same |
| JP5865426B2 (en) * | 2014-04-28 | 2016-02-17 | 昭和電線ケーブルシステム株式会社 | Manufacturing method of oxide superconducting wire |
-
1992
- 1992-10-23 JP JP4309639A patent/JP3032653B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06140234A (en) | 1994-05-20 |
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