JP2667972B2 - Bi-based oxide composite superconducting wire - Google Patents
Bi-based oxide composite superconducting wireInfo
- Publication number
- JP2667972B2 JP2667972B2 JP2272159A JP27215990A JP2667972B2 JP 2667972 B2 JP2667972 B2 JP 2667972B2 JP 2272159 A JP2272159 A JP 2272159A JP 27215990 A JP27215990 A JP 27215990A JP 2667972 B2 JP2667972 B2 JP 2667972B2
- Authority
- JP
- Japan
- Prior art keywords
- based oxide
- superconducting wire
- silver
- wire
- superconducting
- 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
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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
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- Metal Extraction Processes (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、Bi系酸化物複合超電導線材に関するもの
である。さらに詳しくは、この発明は、超電導特性を向
上させることのできるBi系酸化物複合超電導線材に関す
るものである。TECHNICAL FIELD The present invention relates to a Bi-based oxide composite superconducting wire. More specifically, the present invention relates to a Bi-based oxide composite superconducting wire capable of improving superconducting properties.
（従来の技術） 酸化物超電導体については、La系、Ｙ系、Bi系および
Tl系がこれまでに見出されてきており、その実用化につ
いての研究も盛んに行われてきている。これらの酸化物
超電導体の中でも、臨界温度等の超電導特性が良好で、
最も実用的であると注目されているものがBi系酸化物超
電導体である。(Prior art) For oxide superconductors, La-based, Y-based, Bi-based and
The Tl system has been found so far, and research on its practical use has been actively conducted. Among these oxide superconductors, superconducting properties such as critical temperature are good,
Bi-based oxide superconductors have been receiving attention as the most practical.
このBi系酸化物超電導体をたとえば線材として製造す
る場合には、従来では、銀シース法が広く採用されてき
ている。In the case of manufacturing this Bi-based oxide superconductor as, for example, a wire, the silver sheath method has been widely used in the past.
銀シース法は、銀の管体の内部にBi系超電導体の仮焼
粉末を充填し、これを伸線加工して線材とし、熱処理に
より超電導線材とする方法であって、この方法により得
られる銀シース線は、 長尺線材が作りやすい。The silver sheath method is a method in which a calcined powder of a Bi-based superconductor is filled into a silver tubular body, and this is drawn into a wire, and a superconducting wire is formed by heat treatment, which is obtained by this method. Silver sheath wire is easy to make long wire.
多芯線にしやすい。 Easy to multi-core wire.
シースした銀を安定化材として利用することができ
る。Sheathed silver can be used as a stabilizing material.
などの種々の実用上の利点を有しているものである。It has various practical advantages.
（発明が解決しようとする課題） しかしながら、上記したような実用上有利とされる銀
シース法により製造したBi系酸化物超電導線材の場合に
も、ドクターブレード法によるテープ線材と比較する
と、その臨界電流密度（Jc）が実際には劣っているとい
う欠点がある。(Problems to be Solved by the Invention) However, even in the case of the Bi-based oxide superconducting wire manufactured by the silver sheath method which is considered to be practically advantageous as described above, its criticality is lower than that of the tape wire by the doctor blade method. The current density (Jc) is actually inferior.
そこで、銀シース法についての上記のとおりの実用上
の特徴を生かしつつ臨界電流密度（Jc）を向上させるた
めの方策が必要とされる。Therefore, it is necessary to take measures to improve the critical current density (Jc) while making the most of the practical characteristics of the silver sheath method as described above.
しかし、このことは簡単ではない。たとえば、酸化物
超電導線の製造方法として、金属管中に金属製心材を長
さ方向に配置し、この金属製心材と金属管との間に酸化
物超電導体粉末を充填し、伸線加工を施した後に外周の
金属層をエッチング、レーザー加工等によって除去し、
その後、酸素含有雰囲気中で熱処理して超電導線材とす
る方法（特開平１−163913号）が知られており、この方
法によれば、熱処理時には外周の金属層が除去されてお
り、金属層による酸化物超電導体の拘束がないため、酸
化物超電導体の体積収縮が円滑に行われ、酸化物超電導
体が緻密化するとともにその内部にポアやクラックが生
じないことによって、臨界電流密度が向上するとされて
いる。そして、線材中の金属製心材の存在によって線材
の機械的強度も向上するとされている。But this is not easy. For example, as a method of manufacturing an oxide superconducting wire, a metal core is disposed in a metal tube in a length direction, and an oxide superconductor powder is filled between the metal core and the metal tube, and wire drawing is performed. After applying, remove the outer metal layer by etching, laser processing, etc.,
Thereafter, a method of heat treating in an oxygen-containing atmosphere to form a superconducting wire (Japanese Patent Laid-Open No. 1-163913) is known. According to this method, the outer peripheral metal layer is removed during the heat treatment, and the superconducting wire is removed. Because there is no constraint of the oxide superconductor, the volume contraction of the oxide superconductor is performed smoothly, and the oxide superconductor is densified and pores and cracks do not occur inside, so that the critical current density is improved. Has been done. The mechanical strength of the wire is also improved by the presence of the metal core in the wire.
しかしながら、Ｙ−Ba系酸化物を対象として考えられ
た以上の方法は、熱処理により酸化物超電導線材とする
時に外周の金属層を除去するという特徴を有しているも
のの、この特徴は、Bi系酸化物超電導線材の製造におい
ては臨界電流密度（Jc）の向上には寄与しないのであ
る。However, although the above-mentioned method considered for the Y-Ba-based oxide has a feature of removing the outer metal layer when the oxide superconducting wire is formed by heat treatment, this feature is based on the Bi-based oxide. It does not contribute to the improvement of critical current density (Jc) in the production of oxide superconducting wire.
このため、このような従来方法は全く別の技術的観点
からのBi系超電導線材のための特有の方策として、臨界
電流密度（Jc）向上のための新しい手段の実現が求めら
れていた。For this reason, such a conventional method is required to realize a new means for improving the critical current density (Jc) as a unique measure for Bi-based superconducting wires from a completely different technical point of view.
この発明は、以上の通りの事情に鑑みてなされたもの
であり、従来の銀シース法によるBi酸化物超電導線材の
欠点を解消し、超電導特性を向上させることのできるBi
系酸化物複合超電導線材を提供することを目的としてい
る。The present invention has been made in view of the circumstances described above, and has been made to solve the problems of the Bi oxide superconducting wire by the conventional silver sheath method and to improve the superconducting characteristics.
An object is to provide an oxide-based composite superconducting wire.
（課題を解決するための手段） この発明は、上記の課題を解説するものとして、銀の
鞘の中に組成構成元素としてBi、Sr、Ca、Cuおよび酸
素、またはBi、Pb、Sr、Ca、Cuおよび酸素を有するBi系
酸化物超電導体で囲まれた銀の核を有し、Bi系酸化物超
電導体は結晶配向していることを特徴とするBi系酸化物
複合超電導線材を提供する。(Means for Solving the Problems) The present invention describes Bi, Sr, Ca, Cu and oxygen as constituent elements in a silver sheath, or Bi, Pb, Sr, Ca Provided is a Bi-based oxide composite superconducting wire having a silver nucleus surrounded by a Bi-based oxide superconductor having Cu, oxygen, and wherein the Bi-based oxide superconductor is crystallographically oriented. .
またこの発明は、上記したBi系酸化物複合超電導線材
の外側をBi系酸化物超電導体で囲み、さらにその外側を
銀で囲んでなることを特徴とするBi系酸化物複合超電導
線材を提供するものでもある。Further, the present invention provides a Bi-based oxide composite superconducting wire characterized in that the Bi-based oxide composite superconducting wire described above is surrounded by a Bi-based oxide superconductor and further surrounded by silver. It is also a thing.
対象としてのBi系酸化物超電導体としては、Bi2Sr2Ca
Cu2Ox、Bi2Sr2Ca2Cu3Ox、（Bi,Pb）2Sr2Ca2Cu3Oxをはじ
めとして、さらにBi−Tl系、その他の各種の組成のもの
が含まれる。なかでも、Bi2Sr2CaCu2Oxは、この発明に
よって大きな特性改善が認められるものである。As the Bi-based oxide superconductor as a target, Bi 2 Sr 2 Ca
Including Cu 2 O x , Bi 2 Sr 2 Ca 2 Cu 3 O x , (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O x, as well as Bi-Tl system and other various compositions . Among them, Bi 2 Sr 2 CaCu 2 O x is recognized to have a great improvement in characteristics by the present invention.
（作 用） この発明においては、超電導線材について、従来の技
術とは本質的に異なるBi系超電導体特有の知見を踏まえ
ている。(Operation) In the present invention, the superconducting wire is based on knowledge unique to Bi-based superconductors, which is essentially different from the conventional technology.
すなわち、Bi系酸化物超電導体においては、結晶の配
向性と結晶粒界での電気的結合の改善が臨界電流特性を
向上させるために不可欠であるということである。つま
り、まず第一には結晶を配向させる方法としては、部分
的に酸化物を溶融させて結晶の核を形成させ、次第に冷
却する過程においてその結晶を一方向に成長させる方法
が有効であるが、この時に、酸化物を溶融するだけで
は、Bi−リッチの液相が存在するのみ反応が余り進まな
いこと、一方、銀が存在すると、この銀が触媒的効果を
発揮し、酸化物の融点を下げ、反応を促進させ、しかも
生成する液相や析出する超電導相の組成を均質化させ、
この銀の作用効果により、非超電導相の量が減少し、結
晶の高配向性を実現することである。That is, in the Bi-based oxide superconductor, improvement of crystal orientation and electrical coupling at crystal grain boundaries is indispensable for improving critical current characteristics. In other words, first of all, as a method of orienting a crystal, a method of partially melting an oxide to form a crystal nucleus and growing the crystal unidirectionally in a process of gradually cooling is effective. At this time, simply melting the oxide does not allow the reaction to proceed so much because only a Bi-rich liquid phase is present. On the other hand, when silver is present, the silver exerts a catalytic effect, and the melting point of the oxide is reduced. Lowering the temperature, accelerating the reaction, and homogenizing the composition of the generated liquid phase and the precipitated superconducting phase,
The effect of this silver is to reduce the amount of non-superconducting phase and realize high crystal orientation.
そして、第二には、この銀の作用は、酸化物と銀の配
置を、両者間の界面となる面積が有効に増大されるよう
に適正化することで、臨界電流密度（Jc）の向上をもた
らすとの新しい知見である。このようなことは、従来公
知の銀シース法並びに金属管とともに金属心材を用い、
伸線加工の後に外周の金属層を除去して熱処理する超電
導線材の製造法からは考慮されないことであり、その作
用効果も、Bi系超電導材に特有のものとして予見できな
かったことである。Second, the effect of silver is to improve the critical current density (Jc) by optimizing the arrangement of the oxide and silver so that the area of the interface between them is effectively increased. It is new knowledge that brings. Such a thing uses a metal core material together with a conventionally known silver sheath method and a metal tube,
This is not considered from the manufacturing method of the superconducting wire in which the outer peripheral metal layer is removed after the wire drawing and the heat treatment is performed, and the operation and effect cannot be foreseen as being unique to the Bi-based superconducting material.
この発明の超電導線材は、以上のことからも明らかな
ように、銀の芯材と管との間に超電導粉末を充填し、伸
線加工した後に、外周の金属層を取除くことなしに熱処
理をして超電導線材とすることにより製造される。臨界
電流密度（Jc）は、銀と酸化物の界面で結晶配向が進む
ことによって著しく向上することになる。この作用効果
は、銀管と銀の芯との関係を多重管構造とすることでさ
らに促進されることになる。As is clear from the above, the superconducting wire of the present invention is prepared by filling superconducting powder between a silver core material and a tube, drawing, and then heat-treating without removing the outer metal layer. To produce a superconducting wire. The critical current density (Jc) will be significantly improved by the progress of crystal orientation at the interface between silver and oxide. This effect is further promoted by making the relationship between the silver tube and the silver core a multi-tube structure.
（実施例） 以下、実施例を示し、この発明のBi系酸化物複合超電
導線材についてもさらに詳しく説明する。(Examples) Examples will be shown below to further describe the Bi-based oxide composite superconducting wire of the present invention in more detail.
実施例１〜４ Bi2O3,SrCO3,CaCO3およびCuO粉末を、各々、Bi:Sr:C
a:Cu＝2:2:1:2の比に混合し、800℃で20時間仮焼した
後、室温まで急冷し、粉砕して粉末とした（仮焼粉
Ａ）。この仮焼粉Ａの一部を550℃で15時間熱処理した
（仮焼粉Ｂ）。EXAMPLE 1~4 Bi 2 O 3, SrCO 3 , CaCO 3 and CuO powders, respectively, Bi: Sr: C
a: Cu = 2: 2: 1: 2 was mixed and calcined at 800 ° C. for 20 hours, then quenched to room temperature and pulverized to powder (calcined powder A). A part of the calcined powder A was heat-treated at 550 ° C. for 15 hours (calcined powder B).
外径10mm,長さ7cmの銀の丸棒に、深さ5.5cm,内径7mm
の穴を開け、また、残りの1.5cmの部分に直径2mmの開け
た後、直径2mm,長さ7cmの銀の棒を挿入した。このよう
な構造を有する複合管を４本用意し、その各々を150℃
で20時間焼鈍した。A silver round bar with an outer diameter of 10 mm and a length of 7 cm, a depth of 5.5 cm and an inner diameter of 7 mm
A hole having a diameter of 2 mm was made in the remaining 1.5 cm portion, and then a silver rod having a diameter of 2 mm and a length of 7 cm was inserted. Prepare four composite tubes with such a structure, each of them at 150 ℃
For 20 hours.
このうちの２本の複合管には仮焼粉Ａを詰め、また別
の２本の複合管には仮焼粉Ｂを結めた。この後に、中央
および軸方向に2mmの穴を開けた銅栓を各々の複合管に
取付け、銀棒を固定し、さらに仮焼粉Ａまたは仮焼粉Ｂ
を各々封込め、溝ロール線引き加工により外径が1mmに
なるまで伸線した。Two of these composite tubes were filled with calcined powder A, and the other two composite tubes were calcined powder B. After that, a copper stopper having a hole of 2 mm in the center and the axial direction was attached to each composite tube, a silver rod was fixed, and further calcined powder A or calcined powder B
, And drawn by groove roll drawing until the outer diameter became 1 mm.
仮焼粉Ａおよび仮焼粉Ｂを詰めた線材の１本ずつにつ
いては、さらに外径が0.8mmになるまで伸線した。この
間、線材の伸びが10倍になる毎に、150℃で1.5時間の焼
鈍を行った。この後に、最終厚さを0.1〜0.15mmまで加
工した。Each of the wires filled with the calcined powder A and the calcined powder B was further drawn until the outer diameter became 0.8 mm. During this time, the wire was annealed at 150 ° C. for 1.5 hours every time the elongation of the wire became 10 times. After this, the final thickness was machined to 0.1-0.15 mm.
残りの２本の線材については、平ロール加工により、
最終厚さ0.1〜0.6mmまで加工した。なお、この間におい
て、最終厚さより0.1〜0.15mmだけ厚い段階で、850℃で
15時間の熱処理を行った。For the remaining two wires, flat roll processing
Worked to a final thickness of 0.1-0.6 mm. During this period, at a temperature of 850 ° C at a stage 0.1 to 0.15 mm thicker than the final thickness.
Heat treatment was performed for 15 hours.
このようにして最終厚さに加工した後に、850〜890℃
でBi2Sr2CaCu2Oxの超電導相を生成させる熱処理を行っ
た。After processing to the final thickness in this way, 850-890 ° C
Then, heat treatment for generating a superconducting phase of Bi 2 Sr 2 CaCu 2 O x was performed.
以上の試料について示したものが表１である。 Table 1 shows the results of the above samples.
また、これらの試料について臨界電流密度（Jc）を測
定し、その結果を磁界との関係で示したものが第１図の
（ａ）（ｂ）（ｃ）（ｄ）である。The critical current densities (Jc) of these samples were measured, and the results are shown in relation to the magnetic field in FIGS. 1 (a), (b), (c) and (d).
後述する比較例との対比からも明らかなように、臨界
電流密度（Jc）が向上することが確認された。It was confirmed that the critical current density (Jc) was improved, as is clear from comparison with Comparative Examples described later.
比較例１ 従来の銀シース法により、実施例１〜４と同一組成の
超電導相を有し、銀芯のないBi径超電導線材を作製し
た。この超電導線材について、実施例１〜４と同様に、
臨界電流密度（Jc）を測定した。 Comparative Example 1 A Bi-diameter superconducting wire having a superconducting phase having the same composition as in Examples 1 to 4 and no silver core was produced by the conventional silver sheath method. About this superconducting wire, as in Examples 1-4,
The critical current density (Jc) was measured.
その結果を示したものが第１図の（ｅ）である。 FIG. 1 (e) shows the result.
臨界電流密度（Jc）は、この発明の超電導線材よりも
劣っていた。The critical current density (Jc) was inferior to that of the superconducting wire of the present invention.
実施例５ 第２図および第３図に示したような銀芯（１）の周り
に銀管（２）（３）を同軸上に配設した複合管を作製
し、これを150℃で２時間焼鈍した後、その空隙（４）
に実施例１〜４で作製した仮焼粉を詰め、中央に開口部
（５）を有する銅栓（６）を取付けた。この複合管を溝
ロール線引き加工した後に、平ロール加工によりテープ
状に冷間加工し、さらに熱処理を行った。この間の焼鈍
および熱処理は、実施例１〜４と同様にした。Example 5 A composite tube having silver tubes (2) and (3) arranged coaxially around a silver core (1) as shown in FIGS. 2 and 3 was prepared. After annealing for a time, the void (4)
Was filled with the calcined powder produced in Examples 1 to 4, and a copper plug (6) having an opening (5) in the center was attached. After this composite pipe was subjected to groove roll wire drawing processing, it was cold worked into a tape shape by flat roll processing and further heat treated. The annealing and heat treatment during this period were the same as in Examples 1 to 4.
このようにして作製した線材から短尺試料を切出し、
臨界温度（Tc）および臨界電流密度（Jc）を測定した。
臨界温度（Tc）および臨界電流密度（Jc）はともに優れ
ていた。Cut a short sample from the wire rod manufactured in this way,
The critical temperature (Tc) and the critical current density (Jc) were measured.
Both the critical temperature (Tc) and the critical current density (Jc) were excellent.
実施例６ 実施例１〜５で作製した丸棒を2.5cmの長さに切出
し、これらのうち外径0.8mm以上のものについては、外
側の銀を加熱した硝酸９対沸酸１の混酸に浸し、外径0.
7〜0.8mmまで取去った。このように処理した線材を30〜
50本束ね、外径7mm,長さ5cm,内径5.2mm,深さ3.5cmの銀
管に詰め、実施例１〜４と同様の冷間伸線を行い、厚さ
0.2〜0.8mmの多芯線テープとした後に、熱処理した。得
られたテープの臨界温度（Tc）および臨界電流密度（J
c）を測定したところ、ともに特性に優れたものであっ
た。Example 6 The round bars prepared in Examples 1 to 5 were cut out to a length of 2.5 cm, and those having an outer diameter of 0.8 mm or more were mixed with 9 parts of nitric acid to 1 part of hydrofluoric acid in which the outer silver was heated. Soak, outer diameter 0.
Removed to 7-0.8mm. 30 ~
Bundled 50 pieces, packed in a silver tube with an outer diameter of 7 mm, a length of 5 cm, an inner diameter of 5.2 mm, and a depth of 3.5 cm, cold drawn as in Examples 1 to 4, and
After forming a multi-core wire tape of 0.2 to 0.8 mm, it was heat-treated. The critical temperature (Tc) and critical current density (J
When c) was measured, both were excellent in characteristics.
実施例７ Bi2O3,PbO,Pb2O3,SrCO3,CaCO3およびCuO粉末を、各
々、Bi:Pb:Sr:Ca:Cu＝1.8:0.4:2:2:3の比に混合したも
のを800〜850℃で仮焼し、室温にまで急冷した後に、粉
砕し、仮焼粉とした。これを実施例１〜５で用いた複合
管に詰め、実施例１〜４と同様の工程で伸線し、実施例
６と同様にして多芯線を作製した。Example 7 Bi 2 O 3 , PbO, Pb 2 O 3 , SrCO 3 , CaCO 3 and CuO powder were mixed at a ratio of Bi: Pb: Sr: Ca: Cu = 1.8: 0.4: 2: 2: 3, respectively. The calcined product was calcined at 800 to 850 ° C., rapidly cooled to room temperature, and then pulverized to obtain a calcined powder. This was packed in the composite tubes used in Examples 1 to 5, and drawn in the same steps as in Examples 1 to 4, to produce a multi-core wire in the same manner as in Example 6.
得られた多芯線の臨界温度（Tc）および臨界電流密度
（Jc）を測定したところ、ともに特性に優れたものであ
った。When the critical temperature (Tc) and critical current density (Jc) of the obtained multifilamentary wire were measured, both were excellent in characteristics.
もちろんこの発明は、以上の例によって限定されるも
のではない。複合管の大きさ、形状および構造、加工方
式およびその条件、また、熱処理条件等の細部について
は様々な態様が可能であることはいうまでもない。Of course, the present invention is not limited by the above examples. It goes without saying that various aspects are possible in details such as the size, shape and structure of the composite pipe, the processing method and its conditions, and the heat treatment conditions.
（発明の効果） 以上詳しく説明した通り、この発明によって、高磁界
中でも大きな臨界電流密度（Jc）の電流を流すことので
きる超電導特性の向上したBi系酸化物複合超電導線材が
提供される。この線材は、超電導変圧器、超電導発電
機、超電導電力貯蔵機、精密磁界用超電導磁石、交流用
超電導磁石、磁気浮上交通システム用超電導磁石、磁気
推進用超電導磁石、超電導送電等への応用が期待され
る。(Effects of the Invention) As described in detail above, the present invention provides a Bi-based oxide composite superconducting wire having improved superconductivity, which allows a current having a large critical current density (Jc) to flow even in a high magnetic field. This wire is expected to be applied to superconducting transformers, superconducting generators, superconducting power storage devices, superconducting magnets for precision magnetic fields, superconducting magnets for AC, superconducting magnets for magnetic levitation transportation systems, superconducting magnets for magnetic propulsion, superconducting power transmission, etc. To be done.
【図面の簡単な説明】 第１図は、この発明のBi系酸化物複合超電導線材と従来
の銀シース法によるBi系酸化物超電導線材の磁界（Ｂ）
と臨界電流密度（Jc）との関係を示した相関図である。 第２図および第３図は、各々、複合管の一実施例を示し
た断面図および斜視図である。 １……銀芯 2,3……銀管 ４……空隙 ５……開口部 ６……銅栓BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a magnetic field (B) of a Bi-based oxide superconducting wire of the present invention and a Bi-based oxide superconducting wire obtained by a conventional silver sheath method.
FIG. 4 is a correlation diagram showing a relationship between the critical current density (Jc). 2 and 3 are a sectional view and a perspective view, respectively, showing one embodiment of the composite pipe. 1 ... Silver core 2,3 ... Silver tube 4 ... Void 5 ... Opening 6 ... Copper stopper
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 廉 茨城県つくば市千現１丁目２番１号 科 学技術庁金属材料技術研究所筑波支所内 (72)発明者 前田 弘 茨城県つくば市千現１丁目２番１号 科 学技術庁金属材料技術研究所筑波支所内 審査官 ▲吉▼田 耕一 (56)参考文献 特開 平１−163913（ＪＰ，Ａ) ───────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryo Inoue 1-2-1, Sengen, Tsukuba, Ibaraki Pref., National Institute of Science and Technology Tsukuba Branch (72) Inventor, Hiroshi Maeda 1 Sengen, Tsukuba, Ibaraki 2-1-1, Researcher, Tsukuba Branch, Research Institute for Metals, Japan Agency for Science and Technology ▲ Yoshi ▼ Koichi Tada (56) Reference JP-A-1-163913 (JP, A)
Claims (4)
Ca、Cuおよび酸素、またはBi、Pb、Sr、Ca、Cuおよび酸
素を有するBi系酸化物超電導体で囲まれた銀の核を有
し、Bi系酸化物超電導体は結晶配向していることを特徴
とするBi系酸化物複合超電導線材。1. Bi, Sr, as a constituent element in a silver sheath
A silver nucleus surrounded by a Bi-based oxide superconductor containing Ca, Cu and oxygen, or Bi, Pb, Sr, Ca, Cu and oxygen, and the Bi-based oxide superconductor is crystal-oriented. A Bi-based oxide composite superconducting wire characterized by the following.
線材の外側をBi系酸化物超電導体で囲み、さらにその外
側を銀で囲んでなることを特徴とするBi系酸化物複合超
電導線材。2. The Bi-based oxide composite according to claim 1, wherein the Bi-based oxide composite superconducting wire is surrounded by a Bi-based oxide superconductor and further surrounded by silver. Superconducting wire.
物超電導体がBi2Sr2CaCu2Ox、Bi2Sr2Ca2Cu3Ox、または
（Bi,Pb）3Sr2Ca2Cu3OxであるBi系酸化物複合超電導線
材。3. The Bi-based oxide superconductor according to claim 1 or 2, wherein Bi 2 Sr 2 CaCu 2 O x , Bi 2 Sr 2 Ca 2 Cu 3 O x , or (Bi, Pb) 3 Bi-based oxide composite superconducting wire of Sr 2 Ca 2 Cu 3 O x .
物複合超電導線材を多数束ね、多芯線構造としてなるこ
とを特徴とするBi系酸化物複合超電導線材。4. A Bi-based oxide composite superconducting wire characterized in that it has a multi-core structure by bundling a large number of Bi-based oxide composite superconducting wires according to (1) or (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2272159A JP2667972B2 (en) | 1990-10-12 | 1990-10-12 | Bi-based oxide composite superconducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2272159A JP2667972B2 (en) | 1990-10-12 | 1990-10-12 | Bi-based oxide composite superconducting wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04149913A JPH04149913A (en) | 1992-05-22 |
| JP2667972B2 true JP2667972B2 (en) | 1997-10-27 |
Family
ID=17509914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2272159A Expired - Lifetime JP2667972B2 (en) | 1990-10-12 | 1990-10-12 | Bi-based oxide composite superconducting wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2667972B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2563411B2 (en) * | 1987-12-19 | 1996-12-11 | 株式会社東芝 | Manufacturing method of oxide superconducting wire |
-
1990
- 1990-10-12 JP JP2272159A patent/JP2667972B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04149913A (en) | 1992-05-22 |
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