JP2961240B2 - Oxide superconductor / High strength ceramic laminated current lead - Google Patents
Oxide superconductor / High strength ceramic laminated current leadInfo
- Publication number
- JP2961240B2 JP2961240B2 JP7240925A JP24092595A JP2961240B2 JP 2961240 B2 JP2961240 B2 JP 2961240B2 JP 7240925 A JP7240925 A JP 7240925A JP 24092595 A JP24092595 A JP 24092595A JP 2961240 B2 JP2961240 B2 JP 2961240B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide superconductor
- current lead
- strength
- superconductor
- strength ceramic
- 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 - Lifetime
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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、酸化物超電導体と
高強度セラミックスを交互に積層して多層化した平板状
の積層体を更に金属電極と接合して複合化してなる酸化
物超電導体電流リードに関するものであり、更に詳しく
は、酸化物超電導体と高強度セラミックスを面内方向に
交互に積層化した複数の平板を、端部に金属電極を挟ん
だ状態で、更に並列に接合して複合化した構造を備えた
ことを特徴とする酸化物超電導体／高強度セラミックス
積層化電流リードに関するものである。本発明は、粒子
配向性が高く、緻密で臨界電流密度が高く、機械的強度
が顕著に高く、電流リードとしての種々の優れた特性を
有し、しかも簡便に作製することが可能な新しい構造の
酸化物超電導体／高強度セラミックス積層化電流リード
を提供するものである。BACKGROUND OF THE INVENTION The present invention relates to a superconducting oxide superconductor formed by alternately laminating oxide superconductors and high-strength ceramics to form a multi-layered plate-like laminate, which is further joined to metal electrodes to form a composite. More specifically, a plurality of flat plates in which oxide superconductors and high-strength ceramics are alternately laminated in the in-plane direction are further joined in parallel with metal electrodes sandwiched at the ends. The present invention relates to an oxide superconductor / high-strength ceramic laminated current lead having a composite structure. The present invention is a new structure that has high particle orientation, high density, high critical current density, remarkably high mechanical strength, has various excellent properties as a current lead, and can be easily manufactured. The present invention provides an oxide superconductor / high-strength ceramic laminated current lead.
【０００２】[0002]
【従来の技術】一般に、超電導マグネット等の極低温機
器には、極低温下で電気抵抗が小さく、熱伝導率も小さ
い酸化物高温超電導体材料を用いた電流リードが使用さ
れる。このような電流リードは、極低温機器の極低温域
への熱侵入量を最小にするように設計する必要があるこ
とから、従来、電気抵抗が小さく、熱伝導率が極めて低
い優れた特性を有する酸化物高温超電導体材料の開発と
それを用いた電流リードの開発が種々試みられており、
例えば、Ｂｉ系酸化物高温超電導電流リード（Ｔ．ＩＥ
Ｅ．Ｊａｐａｎ，Ｖｏｌ．１１５−Ａ，Ｎｏ．３，３０
２−３０７（１９９５））、銀被覆Ｂｉ系高温超電導線
材を用いた電流リード（Ｔ．ＩＥＥ．Ｊａｐａｎ，Ｖｏ
ｌ．１１５−Ａ，Ｎｏ．３，２５１−２５６（１９９
５））、ビスマス系銅酸化物超電導体を棒状あるいは円
管状に焼結したもの（応用物理，第６３巻，第４号，３
６２−３６９（１９９４））等種々のものが報告されて
いる。2. Description of the Related Art Generally, a current lead using an oxide high-temperature superconductor material having a small electric resistance and a low thermal conductivity at a very low temperature is used for a cryogenic device such as a superconducting magnet. Since such a current lead needs to be designed to minimize the amount of heat penetration of the cryogenic device into the cryogenic region, it has conventionally been known that it has excellent characteristics of low electric resistance and extremely low thermal conductivity. Various developments of oxide high-temperature superconductor materials and current leads using them have been attempted.
For example, Bi-based oxide high-temperature superconducting current leads (T. IE
E. FIG. Japan, Vol. 115-A, no. 3,30
2-307 (1995)), a current lead using a silver-coated Bi-based high-temperature superconducting wire (T. IEEE Japan, Vo.
l. 115-A, no. 3, 251-256 (199
5)), a bismuth-based copper oxide superconductor sintered in a rod shape or a tubular shape (Applied Physics, Vol. 63, No. 4, 3)
62-369 (1994)).
【０００３】一般に、超電導体電流リードを作製する場
合、臨界電流値を大きくとること、低侵入熱特性を持た
せること、また、接触抵抗の小さい電極を形成するこ
と、機械強度を向上すること等が重要な要件とされる。
これまでの報告によれば、例えば、バルク電流リードの
製法としては、冷間静水圧プレスにより成形し、焼結及
び中間冷間静水圧プレスを繰り返して作る中間ＣＩＰ焼
結法などが利用されている。また、従来の電流リードの
構造としては、形態的には、中空の円筒状のものの他
に、中実の円柱状のものが製作されているが、いずれに
しても、製造の最終工程は常圧焼結であり、焼結体の相
対密度は約８５％、臨界電流密度は約１２００Ａ／ｃｍ
2 にとどまっている。[0003] In general, when producing a superconductor current lead, it is necessary to increase the critical current value, to provide low penetration heat characteristics, to form an electrode with low contact resistance, to improve mechanical strength, and the like. Is an important requirement.
According to previous reports, for example, as a method of manufacturing a bulk current lead, an intermediate CIP sintering method, which is formed by cold isostatic pressing and repeatedly sintering and intermediate cold isostatic pressing, is used. I have. In addition, as a structure of the conventional current lead, in terms of form, in addition to a hollow cylindrical one, a solid cylindrical one is manufactured, but in any case, the final step of the manufacturing is always performed. Pressure sintering, the relative density of the sintered body is about 85%, and the critical current density is about 1200 A / cm
Stays at two .
【０００４】酸化物高温超電導体に形成する電極は、電
極部の接触抵抗を減少させ、通電時の発熱を低下させる
必要があることから、従来、接触面積の増大化を図った
り、接触抵抗率を低減させるための種々の方法が採用さ
れており、例えば、電極を超電導体内部に埋め込んで一
体化させ、接触面積を増大させる方法や、超電導体の表
面に微細な凹凸面を形成させる方法、溶射により金属を
接着させる方法など各種の方法が提案されている。更
に、超電導体に表面処理を施して改質したり、超電導体
に金属テープを巻きつけ、加圧、熱処理して密着度を高
めた電極を形成して、接触抵抗率を低く抑える方法など
も提案されている。[0004] The electrodes formed on the oxide high-temperature superconductor need to reduce the contact resistance of the electrode portions and reduce the heat generation during energization. Various methods have been adopted for reducing, for example, a method of embedding the electrodes inside the superconductor and integrating them, a method of increasing the contact area, a method of forming a fine uneven surface on the surface of the superconductor, Various methods have been proposed, such as a method of bonding metal by thermal spraying. Furthermore, there is a method of applying a surface treatment to the superconductor to modify it, or wrapping a metal tape around the superconductor, forming an electrode with increased adhesion by applying pressure and heat treatment, and keeping the contact resistivity low. Proposed.
【０００５】このように、従来、各種の超電導体電流リ
ードが開発されているものの、いまだ改善すべき余地が
多々あり、例えば、中実の円柱状の超電導体の臨界電流
値を増加させるために電流リードの径を大きくすると、
円柱の内と外との加圧が不均質になり、円柱の内部の臨
界電流密度が減少し、断面積の程度に対応した臨界電流
値を得ることができなくなるという問題点がある。ま
た、円柱の径を大きくすると焼結時に温度差が生じそれ
によりワレを生じるなど、製造が困難なものとなる。複
数本の電流リードを並列に接続する場合は、電流リード
そのものが大型となり、装置を小型化することは困難と
なる。中空の円筒状の超電導体を薄肉に形成した場合、
臨界電流密度が改善され、中実の円柱状の超電導体に比
べて給電量は大きくなるが、中空部分の内部空間が必要
とされ電流リードや装置全体を小型化する上で難点があ
る。装置の小型化は、装置の性能や信頼性の上で重要な
課題とされる。中空の薄肉の円筒状超電導体は、機械的
強度が弱く、取扱いが煩雑となる欠点がある。また臨界
電流値を上げるため、あるいは強度を増すために断面積
を大きくして厚肉の円筒を作製すると、中実の円柱状の
場合と同様に、内部に不均質の部分が残り、臨界電流密
度の低い層が形成されるという問題点が生じる。As described above, although various superconductor current leads have been developed, there is still much room for improvement. For example, in order to increase the critical current value of a solid cylindrical superconductor. Increasing the diameter of the current lead
There is a problem that the pressurization between the inside and the outside of the cylinder becomes uneven, the critical current density inside the cylinder decreases, and it becomes impossible to obtain a critical current value corresponding to the degree of the cross-sectional area. In addition, if the diameter of the cylinder is increased, a temperature difference occurs at the time of sintering, thereby causing cracks, which makes production difficult. When a plurality of current leads are connected in parallel, the current leads themselves become large, and it is difficult to reduce the size of the device. When a hollow cylindrical superconductor is formed thin,
Although the critical current density is improved and the amount of power supply is larger than that of a solid cylindrical superconductor, the internal space of the hollow portion is required, and there is a problem in miniaturizing the current lead and the entire device. The miniaturization of the device is an important issue in terms of the performance and reliability of the device. Hollow thin-walled cylindrical superconductors have the drawback that mechanical strength is weak and handling is complicated. When a thick cylinder is manufactured with a large cross-sectional area to increase the critical current value or increase the strength, as in the case of a solid cylinder, an inhomogeneous portion remains inside, and the critical current increases. There is a problem that a low density layer is formed.
【０００６】一方、前記のように、電極形成に関しても
接触抵抗率を下げ、接触面積を増加させるように様々な
方法が探られているが、電流リードの形状が定まってい
るため、接触面積の増大には限りがあり、接触抵抗の減
少には限度がある。電流導入部の接続抵抗の問題につい
ては、機械的強度、耐衝撃性などを含めて更に改善すべ
き課題は多々存在する。On the other hand, as described above, various methods have been sought to lower the contact resistivity and increase the contact area in forming the electrodes. However, since the shape of the current lead is fixed, the contact area is reduced. The increase is limited and the reduction in contact resistance is limited. Regarding the problem of the connection resistance of the current introducing portion, there are many problems to be further improved, including mechanical strength and impact resistance.
【０００７】このような状況の中で、本発明者らは、前
記従来技術に鑑みて、酸化物超電導材料を緻密で臨界電
流密度が高く、しかも機械的強度が高く、取扱いや冷却
負担を軽減し得る新しい構造のバルク電流リードを作製
し、更に接触抵抗を低く抑えることの可能な電極を形成
した新しい構造の酸化物超電導体電流リードを開発する
ことを目標として鋭意研究を積み重ねた結果、酸化物超
電導体と高強度セラミックスを積層して多層化した複数
の平板を、端部に金属電極を挟んだ状態で、更に接合し
て複合化することにより所期の目的を達成し得ることを
見い出し、本発明を完成するに至った。Under these circumstances, the present inventors, in view of the above-mentioned prior art, have made the oxide superconducting material dense, have a high critical current density, have a high mechanical strength, and reduce the handling and cooling burden. We have made extensive studies with the aim of developing a bulk current lead with a new structure that can be used, and developing a new structure of an oxide superconductor current lead with an electrode that can keep the contact resistance low. Found that the intended purpose can be achieved by joining and combining multiple flat plates made of multilayered superconductors and high-strength ceramics with metal electrodes sandwiched at the ends. Thus, the present invention has been completed.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、酸化物超電
導体と高強度セラミックスを積層して多層化した複数の
平板を、更に金属電極と接合して複合化してなる新しい
構造の酸化物超電導体／高強度セラミックス積層化電流
リードを提供することを目的とするものである。また、
本発明は、粒子配向性が高く均質で緻密な微細構造を有
すると共に、臨界電流密度が高く、接触抵抗が低く、機
械的強度が強く、耐衝撃性に優れた酸化物超電導体／高
強度セラミックス積層化電流リードを提供することを目
的とするものである。SUMMARY OF THE INVENTION The present invention relates to an oxide superconductor having a new structure formed by laminating a plurality of flat plates formed by laminating an oxide superconductor and a high-strength ceramic and further bonding the same to a metal electrode. It is an object of the present invention to provide a body / high strength ceramic laminated current lead. Also,
The present invention relates to an oxide superconductor / high-strength ceramics having a high uniformity and a dense microstructure with a high particle current orientation, a high critical current density, a low contact resistance, a high mechanical strength and an excellent impact resistance. It is an object of the present invention to provide a laminated current lead.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
の本発明は、酸化物超電導体と高強度セラミックスを面
内方向に交互に積層化した複数の平板を、端部に金属電
極を挟んだ状態で、更に並列に接合して複合化した構造
を備えたことを特徴とする酸化物超電導体／高強度セラ
ミックス積層化電流リード、である。また、本発明の他
の態様は、酸化物超電導体と高強度セラミックスの積層
化を高温加圧焼結・接合で行い、積層化された平板と金
属電極の複合化を高温加圧接合で行う上記の酸化物超電
導体／高強度セラミックス積層化電流リード、である。
また、本発明の他の態様は、酸化物超電導体がＢｉ−Ｐ
ｂ−Ｓｒ−Ｃａ−Ｃｕ−Ｏ系超電導体で、高強度セラミ
ックスがＭｇＯセラミックスである上記の酸化物超電導
体／高強度セラミックス積層化電流リード、である。更
に、本発明の他の態様は、金属電極が、薄板状の銀又は
銅電極である上記の酸化物超電導体／高強度セラミック
ス積層化電流リード、である。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a plurality of flat plates in which oxide superconductors and high-strength ceramics are alternately laminated in an in-plane direction. An oxide superconductor / high-strength ceramic laminated current lead, characterized in that it is further provided with a composite structure in which it is further joined in parallel in a composite state. In another aspect of the present invention, the lamination of the oxide superconductor and the high-strength ceramics is performed by high-temperature pressure sintering and bonding, and the composite of the laminated flat plate and the metal electrode is performed by high-temperature pressure bonding. The above-described oxide superconductor / high-strength ceramic laminated current lead.
In another embodiment of the present invention, the oxide superconductor is Bi-P
The above-mentioned oxide superconductor / high-strength ceramic laminated current lead, which is a b-Sr-Ca-Cu-O-based superconductor and the high-strength ceramic is MgO ceramic. Still another embodiment of the present invention is the above oxide superconductor / high-strength ceramic laminated current lead, wherein the metal electrode is a thin plate-like silver or copper electrode.
【００１０】[0010]
【発明の実施の形態】次に、本発明について更に詳細に
説明する。本発明の酸化物超電導体／高強度セラミック
ス積層化電流リードは、複数の酸化物超電導体と高強度
セラミックスを面内方向に交互に積層し、高温加圧焼結
・接合して一体化した多層の積層体を、更に端部に金属
電極を夾んだ状態で、並列に接合して複合化した構造を
備えたことを特徴とするものである。本発明において用
いられる酸化物超電導体は、超電導状態を実現できるも
のであれば如何なるものであっても良く、その種類の如
何を問わず使用することが可能であるが、具体的には、
例えば、Ｂｉ−Ｐｂ−Ｓｒ−Ｃａ−Ｃｕ−Ｏ系酸化物超
電導体、Ｙ−Ｂａ−Ｃｕ−Ｏ系酸化物超電導体、Ｔｌ−
Ｂａ−Ｃａ−Ｃｕ−Ｏ系超電導体などが好適なものとし
て例示される。また、高強度セラミックスは、酸化物高
温超電導体との反応性が低いものであれば如何なるもの
であっても良く、その種類の如何を問わず使用すること
が可能であるが、具体的には、例えば、ＭｇＯセラミッ
クス、Ａｌ2 Ｏ3 セラミックス、ＺｒＯ2 セラミックス
などが好適なものとして例示される。本発明において
は、まず複数の酸化物超電導体と高強度セラミックスを
面内方向に交互に積層して多層化した酸化物超電導体／
高強度セラミックス積層体を作製する。Next, the present invention will be described in more detail. The oxide superconductor / high-strength ceramic laminated current lead of the present invention is a multilayer obtained by alternately laminating a plurality of oxide superconductors and high-strength ceramic in an in-plane direction, and sintering and joining them at a high temperature under pressure. And a composite structure in which the laminates are joined in parallel with a metal electrode inserted between the ends. The oxide superconductor used in the present invention may be of any kind as long as it can realize a superconducting state, and can be used regardless of its type.
For example, Bi-Pb-Sr-Ca-Cu-O-based oxide superconductor, Y-Ba-Cu-O-based oxide superconductor, Tl-
Ba-Ca-Cu-O-based superconductors are exemplified as suitable ones. Further, the high-strength ceramics may be of any type as long as it has low reactivity with the oxide high-temperature superconductor, and can be used regardless of the type. For example, MgO ceramics, Al 2 O 3 ceramics, ZrO 2 ceramics and the like are exemplified as suitable ones. In the present invention, first, a plurality of oxide superconductors and high-strength ceramics are alternately laminated in an in-plane direction to form a multilayered oxide superconductor.
Produce a high-strength ceramic laminate.
【００１１】本発明においては、上記酸化物超電導体と
して、例えば、Ｂｉ2 Ｏ3 ，ＰｂＯ，ＳｒＣＯ3 ，Ｃａ
ＣＯ3 ，ＣｕＯの原料粉を大気中で熱処理を施し、これ
を粉砕して得られる仮焼粉を一軸プレス成形により、平
板状に成形したものが好適なものとして用いられる。上
記平板状に成形された酸化物超電導体と、薄板状の高強
度セラミックスを面内方向に交互に積層した後、高温加
圧により焼結と接合を同時に行って一体化し、適宜の層
数の積層体を作製する。この場合、５〜１０層の積層物
とすることが好ましい。上記方法によると、緻密・均質
で高粒子配向化で、臨界電流密度の高い超電導層を形成
することができる。次に、上記積層体を、必要により、
積層方向に平行に適宜幅にて切断し、面内に酸化物超電
導体と高強度セラミックスが積層化された複数の平板を
作成するが、上記成形工程において予め適宜幅に形成さ
れたものであれば、該切断工程は適宜省略し得ることは
云うまでもない。In the present invention, as the oxide superconductor, for example, Bi 2 O 3 , PbO, SrCO 3 , Ca
A material obtained by subjecting raw material powders of CO 3 and CuO to a heat treatment in the air and pulverizing the calcined powders into a flat plate by uniaxial press molding is preferably used. After the oxide superconductor formed into a flat plate and the high-strength ceramics in the form of a thin plate are alternately laminated in the in-plane direction, sintering and joining are simultaneously performed by high-temperature pressing to be integrated, and an appropriate number of layers are formed. A laminate is produced. In this case, a laminate of 5 to 10 layers is preferable. According to the above method, it is possible to form a superconducting layer having a high critical current density with a dense, homogeneous, high-particle orientation. Next, if necessary, the laminate
It is cut at an appropriate width in parallel with the laminating direction to produce a plurality of flat plates in which the oxide superconductor and the high-strength ceramic are laminated in a plane. Needless to say, the cutting step can be omitted as appropriate.
【００１２】次に、酸化物超電導体と高強度セラミック
スを面内方向に交互に積層化した複数の平板を、端部に
金属電極を挟んだ状態で、更に並列に接合して複合化し
て、本発明の酸化物超電導体／高強度セラミックス積層
化電流リードが作製される。金属電極としては、超電導
体の両端に電極用として、例えば銅、銀などの極低温下
で低抵抗性の金属の薄板が好適なものとして使用され
る。上記酸化物超電導体積層平板と金属電極とは、高温
加圧により接合すれば良く、また、超電導体部分の細分
化により、接触面積を適宜増大化することが可能とな
り、接触抵抗を顕著に低減することができる。最後に、
例えば、酸素中約４００℃で約３０時間保持してアニー
リングを行い、超電導特性を回復させる。Next, a plurality of flat plates in which oxide superconductors and high-strength ceramics are alternately laminated in the in-plane direction are further joined in parallel with a metal electrode sandwiched between the ends to form a composite. The oxide superconductor / high-strength ceramic laminated current lead of the present invention is manufactured. As the metal electrode, a thin metal plate having low resistance at an extremely low temperature, such as copper or silver, is preferably used at both ends of the superconductor. The above-described oxide superconductor laminated flat plate and metal electrode may be joined by high-temperature pressurization, and the contact area can be appropriately increased by subdivision of the superconductor portion, thereby significantly reducing the contact resistance. can do. Finally,
For example, annealing is performed at about 400 ° C. in oxygen for about 30 hours to restore superconducting properties.
【００１３】本発明の酸化物超電導体／高強度セラミッ
クス積層化電流リードは、上記のようにして作製され、
上記のような構造を有するが、上記積層体の各層のサイ
ズ、金属電極のサイズは、特に限定されるものではな
く、目的に応じて種々変更することが可能である。本発
明の酸化物超電導体／高強度セラミックス積層化電流リ
ードは、従来の中空の円筒状あるいは中実の円柱状のも
のに比較して、多層化、複合化を容易に行うことが可能
であり、製造工程が顕著に簡便化される。また、加圧、
焼結の不均一性の問題がほとんどなく、高粒子配向で、
緻密で、均質な材料が得られ、臨界電流密度を高めるこ
とが可能であり、電流リードおよび装置を小型化するこ
とができる。また、酸化物超電導体と高強度セラミック
スを積層化することにより、機械的強度を顕著に高める
ことが可能となり、超電導体電流リードの強度を飛躍的
に増大化することができる。The oxide superconductor / high-strength ceramic laminated current lead of the present invention is manufactured as described above.
Although having the above-described structure, the size of each layer of the laminate and the size of the metal electrode are not particularly limited, and can be variously changed according to the purpose. The oxide superconductor / high-strength ceramic laminated current lead of the present invention can be easily formed into multiple layers and composites as compared with conventional hollow cylindrical or solid columnar leads. In addition, the manufacturing process is significantly simplified. Also, pressurization,
Almost no sintering non-uniformity problem, high grain orientation,
A dense and homogeneous material can be obtained, the critical current density can be increased, and the size of the current lead and the device can be reduced. Further, by laminating the oxide superconductor and the high-strength ceramic, the mechanical strength can be remarkably increased, and the strength of the superconductor current lead can be drastically increased.
【００１４】本発明の酸化物超電導体／高強度セラミッ
クス積層化電流リードは、例えば、以下のような方法に
より製造される。すなわち、まず、酸化物超電導体の平
板状の成形体を作製する。この酸化物超電導成形体とし
ては、固相反応法等によって合成された酸化物超電導体
粉末を金型に充填しプレスして、所定の長さ、幅、厚さ
の平板状に成形された圧粉体等が用いられる。次に、こ
れらの酸化物超電導成形体と、同一の外形形状を有する
高強度セラミックスを面内方向に交互に積層した後、高
温加圧焼結接合して一体化し、多層の積層体を得る。次
に、上記積層体をセラミックス用切断機により、積層方
向に平行に切断し、適宜幅に切断された酸化物超電導体
と高強度セラミックスの積層体を作製する。The oxide superconductor / high-strength ceramic laminated current lead of the present invention is manufactured, for example, by the following method. That is, first, a flat molded body of an oxide superconductor is prepared. As the oxide superconducting molded body, an oxide superconducting powder synthesized by a solid-phase reaction method or the like is filled in a mold, pressed, and pressed into a flat plate having a predetermined length, width and thickness. Powder or the like is used. Next, after these oxide superconducting compacts and high-strength ceramics having the same outer shape are alternately laminated in the in-plane direction, they are joined by high-temperature and pressure-sintering to obtain a multilayer laminate. Next, the laminate is cut by a ceramic cutting machine in parallel with the laminating direction to produce a laminate of the oxide superconductor and the high-strength ceramic, which is cut into an appropriate width.
【００１５】次に、上記により作製した多層の積層体と
金属電極とを、その端部に金属電極が夾持されるような
状態で、交互に並列に高温加圧接合し、複合化して、酸
化物超電導体／高強度セラミックス積層化電流リードを
得る。上記多層の複合体は、上記金属電極を介して並列
に各複合体の側面を相互に接する形で、交互に並列に接
合した構造とした点に特徴を有する。Next, the multi-layered laminate and the metal electrode produced as described above are alternately and parallelly joined to each other at a high temperature and pressure in a state where the metal electrode is sandwiched at the ends thereof, thereby forming a composite. Obtain an oxide superconductor / high-strength ceramic laminated current lead. The multilayer composite is characterized in that it has a structure in which the side surfaces of the composites are alternately connected in parallel in such a manner that the side surfaces of the composites contact each other in parallel via the metal electrode.
【００１６】[0016]
【作用】本発明の酸化物超電導体／高強度セラミックス
積層化電流リードは、酸化物超電導体と高強度セラミッ
クスを高温加圧焼結・接合により多層化し、それを更に
高温加圧接合で金属電極と複合化することにより製造さ
れるが、そのような多層化、複合化により、粒子配向性
が高く、臨界電流密度が高く、熱伝導率が低く、優れた
超電導特性を示す製品が簡便に得られるとともに、機械
的にも強度が高く耐衝撃性の高いものを簡便に作製する
ことが可能となる。また、平板状に成形された酸化物超
電導体を基本構成としているため、特殊な加工工程が必
要とされず、製品の生産効率を向上させることができ
る。更に、上記酸化物超電導体／高強度セラミックス積
層体と金属電極とを交互に接合し、複合化することによ
り、該超電導体積層体の間に多数の電極を適宜形成する
ことができ、その接触抵抗を著しく低減することが可能
となる。The oxide superconductor / high-strength ceramic laminated current lead of the present invention is formed by multi-layering an oxide superconductor and a high-strength ceramic by high-temperature pressing sintering and joining, and further joining the metal electrodes by high-temperature pressing bonding. It is manufactured by compounding with the above.By such multi-layering and compounding, a product with high particle orientation, high critical current density, low thermal conductivity, and excellent superconductivity can be easily obtained. In addition to this, it is possible to easily produce a product having high mechanical strength and high impact resistance. In addition, since the oxide superconductor formed into a flat plate has a basic configuration, a special processing step is not required, and the production efficiency of a product can be improved. Further, by alternately joining the oxide superconductor / high-strength ceramic laminate and the metal electrode to form a composite, a large number of electrodes can be appropriately formed between the superconductor laminates. The resistance can be significantly reduced.
【００１７】[0017]
【実施例】次に、実施例を示して本発明を更に具体的に
説明する。 実施例 （１）平板状超電導体成形体の作製 Ｂｉ2 Ｏ3 ，ＰｂＯ，ＳｒＣＯ3 ，ＣａＣＯ3 ，ＣｕＯ
を原料粉とし、固相反応法により（Ｂｉ，Ｐｂ）2 Ｓｒ
2 Ｃａ2 Ｃｕ3 Ｏy 超電導粉末を合成した。この粉末を
金型に充填し、１００ｋｇｆ／ｃｍ2 の条件で一軸プレ
スを行い、長さ６０ｍｍ、幅１０ｍｍ、厚さ約２ｍｍの
成形体を得た。Next, the present invention will be described more specifically with reference to examples. EXAMPLES (1) Production of a flat superconductor molded body Bi 2 O 3 , PbO, SrCO 3 , CaCO 3 , CuO
Is used as raw material powder, and (Bi, Pb) 2 Sr
2 Ca 2 Cu 3 O y superconducting powder was synthesized. This powder was filled in a mold and subjected to uniaxial pressing under the conditions of 100 kgf / cm 2 to obtain a molded body having a length of 60 mm, a width of 10 mm, and a thickness of about 2 mm.
【００１８】（２）積層体の作製 本発明の電流リードの一実施例を図１〜２に示す。図１
は、平板状の酸化物超電導体成形体と高強度セラミック
スとを交互に重ねて上下方向から加圧した条件で、焼結
と接合を同時に行い、多層に積層された積層体を作製す
る一例を示したものである。図１において、酸化物超電
導体は上記（Ｂｉ，Ｐｂ）2 Ｓｒ2 Ｃａ2 Ｃｕ3 Ｏ
y を、また、高強度セラミックスは厚さ約０．３ｍｍの
ＭｇＯセラミックスを使用して、大気中で、８４０℃、
１０ｋｇｆ／ｃｍ2 、５時間の条件で、高温加圧焼結及
び接合を行い、これらが面内方向に交互に積層された酸
化物超電導体／高強度セラミックス積層体を作製した。(2) Fabrication of Laminate One embodiment of the current lead of the present invention is shown in FIGS. FIG.
Is an example in which sintering and joining are performed simultaneously under the condition that a flat plate-shaped oxide superconductor molded body and high-strength ceramics are alternately stacked and pressed from above and below to produce a multilayered laminated body. It is shown. In FIG. 1, the oxide superconductor is (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O
y , and the high-strength ceramics are MgO ceramics with a thickness of about 0.3 mm,
High-temperature pressure sintering and joining were performed under the conditions of 10 kgf / cm 2 and 5 hours, and an oxide superconductor / high-strength ceramic laminate in which these were alternately laminated in the in-plane direction was produced.
【００１９】（３）多層体の複合体からなる電流リード
の作製 次に、上記積層平板を、銀電極を夾んで、更に並列に、
大気中、８００℃、２０ｋｇｆ／ｃｍ2 、２時間の条件
で高圧加圧接合することにより、上記積層平板と銀電極
とを交互に接合し、複合化した多層体の複合体からなる
電流リードを作製した。最後に、酸素中、４００℃、３
０時間の条件でアニールを行い、超電導特性を十分回復
させた。図２に、得られた複合体からなる電流リードの
構造を示す。この図２の例では、各々の積層体の間に金
属薄板からなる電極を設けているが、上記積層体と電極
の積層数を適宜増大させることが可能であり、これによ
り接触面積を増大化し、接触抵抗の低減化が期待され
る。(3) Production of a current lead made of a composite of a multilayer body.
By bonding under high pressure under the conditions of 800 ° C., 20 kgf / cm 2 and 2 hours in the air, the laminated flat plate and the silver electrode are alternately joined to form a current lead comprising a composite of a multi-layered composite. Produced. Finally, in oxygen at 400 ° C, 3
Annealing was performed under the condition of 0 hour to sufficiently recover the superconductivity. FIG. 2 shows a structure of a current lead made of the obtained composite. In the example of FIG. 2, electrodes made of a thin metal plate are provided between each of the laminates. However, the number of laminates of the laminate and the electrodes can be appropriately increased, thereby increasing the contact area. Therefore, a reduction in contact resistance is expected.
【００２０】[0020]
【発明の効果】以上詳述したように、本発明の酸化物超
電導体／高強度セラミックス積層化電流リードは、酸化
物超電導体と高強度セラミックスを面内方向に交互に積
層化した複数の平板を、端部に金属電極を挟んだ状態
で、更に並列に接合して複合化した構造としたものであ
ることから、緻密で粒子配向化したものを簡便に作製す
ることが可能であり、高い臨界電流密度を得ることがで
きる。また、上記平板状の酸化物超電導体と高強度セラ
ミックスを多層化することにより、機械的強度を顕著に
向上させることが可能となる。また、上記個々の多層の
積層体を、それらの間に金属電極を夾んだ形で接合し、
複合化することにより、超電導体の複合化と電極の形成
を同時的に行うことができ、製造工程を簡便化すること
が可能となると共に、接触面積の増大化による接触抵抗
の低減を図ることができる。それによって、超電導体装
置への熱侵入を増大させることなしに、給電量を増加さ
せることが可能な酸化物超電導体電流リードを提供する
ことができる。As described above in detail, the oxide superconductor / high-strength ceramic laminated current lead of the present invention is composed of a plurality of flat plates in which the oxide superconductor and the high-strength ceramic are alternately laminated in the in-plane direction. In the state where the metal electrode is sandwiched between the ends, the composite structure is formed by further joining in parallel, so that it is possible to easily produce a dense and particle-oriented structure, which is high. A critical current density can be obtained. Further, by forming the above-mentioned plate-shaped oxide superconductor and high-strength ceramics into a multilayer, the mechanical strength can be remarkably improved. Further, the individual multilayer laminates are joined in such a manner that a metal electrode is interposed therebetween,
By making the composite, it is possible to simultaneously form the superconductor and form the electrodes, thereby simplifying the manufacturing process, and reducing the contact resistance by increasing the contact area. Can be. Thereby, it is possible to provide an oxide superconductor current lead capable of increasing the power supply amount without increasing heat penetration into the superconductor device.
【図１】本発明の酸化物超電導体／高強度セラミックス
積層化電流リードにおける積層体作製の一例を示す説明
図である。FIG. 1 is an explanatory view showing an example of manufacturing a laminate in an oxide superconductor / high-strength ceramic laminated current lead of the present invention.
【図２】本発明の酸化物超電導体／高強度セラミックス
積層化電流リードの構造を示す説明図である。FIG. 2 is an explanatory view showing a structure of an oxide superconductor / high-strength ceramic laminated current lead of the present invention.
１ ＭｇＯセラミックス ２ Ｂｉ−Ｐｂ−Ｓｒ−Ｃａ−Ｃｕ−Ｏ系超電導体 ３ ＭｇＯセラミックス ４ Ｂｉ−Ｐｂ−Ｓｒ−Ｃａ−Ｃｕ−Ｏ系超電導体 ５ ＭｇＯセラミックス 酸化物超電導体／高強度セラミックス積層平板 金属電極 Reference Signs List 1 MgO ceramics 2 Bi-Pb-Sr-Ca-Cu-O-based superconductor 3 MgO ceramics 4 Bi-Pb-Sr-Ca-Cu-O-based superconductor 5 MgO ceramics oxide superconductor / high-strength ceramic laminated flat metal electrode
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H01L 39/04 ZAA H01F 6/00 ZAA H01B 12/02 ZAA ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. 6 , DB name) H01L 39/04 ZAA H01F 6/00 ZAA H01B 12/02 ZAA
Claims (4)
面内方向に交互に積層化した複数の平板を、端部に金属
電極を挟んだ状態で、酸化物超電導体の部分と高強度セ
ラミックスの部分が交互に表面に出ている平板の面と金
属電極が相互に接する形で、更に並列に接合して複合化
した構造を備えたことを特徴とする酸化物超電導体／高
強度セラミックス積層化電流リード。1. A plurality of flat plates in which an oxide superconductor and high-strength ceramics are alternately laminated in an in-plane direction are sandwiched between a metal electrode at an end thereof and a high-strength cell.
Laminate part alternately appears on the surface of the flat plate and gold
An oxide superconductor / high-strength ceramic laminated current lead having a composite structure in which metal electrodes are in contact with each other and further joined in parallel.
積層化を高温加圧焼結・接合で行い、積層化された平板
と金属電極の複合化を高温加圧接合で行う請求項１記載
の酸化物超電導体／高強度セラミックス積層化電流リー
ド。2. The method according to claim 1, wherein the lamination of the oxide superconductor and the high-strength ceramics is performed by sintering and joining at a high temperature and a laminated plate and a metal electrode are joined by a high temperature and pressure joining. Oxide superconductor / High strength ceramic laminated current lead.
ａ−Ｃｕ−Ｏ系超電導体で、高強度セラミックスがＭｇ
Ｏセラミックスである請求項１記載の酸化物超電導体／
高強度セラミックス積層化電流リード。3. The oxide superconductor is Bi-Pb-Sr-C.
a-Cu-O based superconductor, high strength ceramics made of Mg
2. The oxide superconductor according to claim 1, which is an O ceramic.
High strength ceramic laminated current lead.
る請求項１記載の酸化物超電導体／高強度セラミックス
積層化電流リード。4. The oxide superconductor / high-strength ceramic laminated current lead according to claim 1, wherein the metal electrode is a thin silver or copper electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7240925A JP2961240B2 (en) | 1995-08-25 | 1995-08-25 | Oxide superconductor / High strength ceramic laminated current lead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7240925A JP2961240B2 (en) | 1995-08-25 | 1995-08-25 | Oxide superconductor / High strength ceramic laminated current lead |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0964423A JPH0964423A (en) | 1997-03-07 |
| JP2961240B2 true JP2961240B2 (en) | 1999-10-12 |
Family
ID=17066693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7240925A Expired - Lifetime JP2961240B2 (en) | 1995-08-25 | 1995-08-25 | Oxide superconductor / High strength ceramic laminated current lead |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2961240B2 (en) |
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|---|---|---|---|---|
| JP4145262B2 (en) * | 2004-03-23 | 2008-09-03 | 三洋電機株式会社 | Multilayer ceramic substrate |
| JP5974278B2 (en) * | 2012-05-11 | 2016-08-23 | 国立大学法人九州大学 | Superconducting rotating machine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3187089B2 (en) * | 1991-09-30 | 2001-07-11 | 京セラ株式会社 | Oxide superconducting structure |
| JPH0536807U (en) * | 1991-10-15 | 1993-05-18 | 三井金属鉱業株式会社 | Oxide superconducting current lead |
| JPH05167108A (en) * | 1991-12-16 | 1993-07-02 | Hitachi Chem Co Ltd | Oxide superconducting current lead and manufacture thereof |
| JPH05243044A (en) * | 1992-02-28 | 1993-09-21 | Asahi Glass Co Ltd | Current lead of oxide superconductor |
-
1995
- 1995-08-25 JP JP7240925A patent/JP2961240B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0964423A (en) | 1997-03-07 |
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