JP2557062B2 - Method for manufacturing oxide superconductor - Google Patents
Method for manufacturing oxide superconductorInfo
- Publication number
- JP2557062B2 JP2557062B2 JP62168104A JP16810487A JP2557062B2 JP 2557062 B2 JP2557062 B2 JP 2557062B2 JP 62168104 A JP62168104 A JP 62168104A JP 16810487 A JP16810487 A JP 16810487A JP 2557062 B2 JP2557062 B2 JP 2557062B2
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- superconductor
- powder
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- cooling
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Classifications
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- 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)
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、超電導マグネット、超電導送電、超電導素
子、超電導発電機、超電導ペーストなどの超電導応用一
般に適用される超電導体の製造方法に関する。TECHNICAL FIELD The present invention relates to a method for producing a superconductor that is generally applied to superconducting applications such as superconducting magnets, superconducting power transmission, superconducting elements, superconducting generators, and superconducting pastes.
「従来の技術」 従来、Ｙ−Ba−Cu−Ｏ系などのＡ−Ｂ−Cu−Ｏ（ただ
しＡはY,Sc,La,Yb等の周期律表III a族元素の１種以上
を示し、ＢはSr,Ba等の周期律表II a族元素の１種以上
を示す）系の酸化物超電導材料を製造する方法の一例と
して、以下に説明する方法が知られている。"Prior Art" Conventionally, AB-Cu-O such as Y-Ba-Cu-O system (where A represents one or more elements of Group IIIa of the periodic table such as Y, Sc, La and Yb). , B represents one or more elements of Group IIa of the periodic table such as Sr and Ba), as an example of a method for producing an oxide superconducting material, the method described below is known.
酸化物超電導体を構成する元素の化合物粉末、例えば
Y2O3粉末とBaCO3粉末とCuO粉末を混合して原料粉末を得
るとともに、この原料粉末を加熱炉内の酸素気流中にお
いて950℃程度の温度で加熱処理し、炉内で徐冷して酸
化物超電導材料を得る方法が知られている。Compound powder of the elements that make up the oxide superconductor, for example
Y 2 O 3 powder was mixed with BaCO 3 powder and CuO powder with obtaining a raw material powder, the raw material powder was heated at a temperature of about 950 ° C. in an oxygen stream in the heating furnace, gradually cooled in the furnace A method for obtaining an oxide superconducting material is known.
「発明が解決しようとする問題点」 前記製造方法において重要な問題となるのは、原料粉
末の焼結体を冷却するに際し、焼結体内部の高温で安定
な正方晶が冷却途中に結晶変態を起こして超電導性を示
す斜方晶に変化することである。従ってこの斜方晶への
変態が円滑になされるように冷却する必要があるが、前
記従来の製造方法にあっては、冷却処理を加熱炉の自然
冷却速度に合わせて行っていただけであって、前記斜方
晶への変態条件などは全く考慮されていない。"Problems to be Solved by the Invention" An important problem in the manufacturing method is that when cooling the sintered body of the raw material powder, a tetragonal crystal stable at high temperature inside the sintered body undergoes crystal transformation during cooling. Occurs to change to orthorhombic crystal exhibiting superconductivity. Therefore, it is necessary to cool so that the transformation to the orthorhombic system can be carried out smoothly, but in the above-mentioned conventional manufacturing method, the cooling treatment was only performed in accordance with the natural cooling rate of the heating furnace. The conditions for transformation to the orthorhombic system are not considered at all.
本発明は、前記問題に鑑みてなされたもので、冷却処
理時に焼結体の結晶構造が正方晶から斜方晶に円滑に変
化できるようにして高品質の超電導体が製造できるよう
にした方法を提供することを目的とする。The present invention has been made in view of the above problems, and a method for producing a high-quality superconductor by allowing the crystal structure of a sintered body to smoothly change from tetragonal to orthorhombic during cooling treatment. The purpose is to provide.
「問題点を解決するための手段」 本発明は、前記問題点を解決するために、Ａ−Ｂ−Cu
−Ｏ（ただし、ＡはLa,Ce,Y,Sc,Ybなどの周期律表III a
族元素の１種以上を示し、ＢはSr,Baの周期律表II a族
元素の１種以上を示す）系の超電導体の構成元素を含む
原料粉末あるいは原料粉末成形体を作成し、前記原料粉
末あるいは原料粉末成形体に加熱処理を施して焼結し、
その後に冷却することにより超電導体を製造するに際
し、前記加熱処理後の冷却処理中に、焼結体の結晶構造
が正方晶から斜方晶に変態する500〜400℃の温度域に前
記焼結体の温度を酸素雰囲気で５〜48時間維持した後に
常温まで冷却するものである。"Means for Solving the Problems" The present invention provides an AB-Cu
-O (where A is La, Ce, Y, Sc, Yb, etc., Periodic Table IIIa
A raw material powder or a raw material powder compact containing a constituent element of a superconductor of the system), in which B represents one or more group elements and B represents one or more group IIa elements in the periodic table of Sr and Ba. The raw material powder or the raw material powder compact is subjected to heat treatment and sintered,
When manufacturing a superconductor by cooling thereafter, during the cooling treatment after the heat treatment, the sintering in the temperature range of 500 to 400 ° C. in which the crystal structure of the sintered body transforms from tetragonal to orthorhombic. The body temperature is maintained in an oxygen atmosphere for 5 to 48 hours and then cooled to room temperature.
「作用」 焼結体の結晶構造が正方晶から斜方晶に変化する500
〜400℃の温度域に酸素雰囲気で５〜48時間保持した後
に常温まで冷却する冷却処理を行うことによって正方晶
から斜方晶に結晶変態する時間を十分確保し、斜方晶の
酸化物超電導体を効率良く生成させる。"Action" The crystal structure of the sintered body changes from tetragonal to orthorhombic 500
By keeping the temperature in the temperature range of ~ 400 ° C for 5 to 48 hours in an oxygen atmosphere and then cooling it to room temperature, a sufficient time for the crystal transformation from tetragonal to orthorhombic is ensured, and the orthorhombic oxide superconductivity is maintained. Generate the body efficiently.
以下に本発明を更に詳細に説明する。 The present invention will be described in more detail below.
本発明方法を実施してＡ−Ｂ−Cu−Ｏ（ただし、Ａは
La,Ce,Y,Sc,Ybなどの周期律表III a族元素の１種以上を
示し、ＢはSr,Baなどの周期律表II a族元素の１種以上
を示す）系の超電導体を製造する場合には、前記各元素
を含有する原料粉末を作成する。When the method of the present invention is carried out, AB-Cu-O (where A is
La, Ce, Y, Sc, Yb, etc. represent at least one group IIIa element of the periodic table, and B represents at least one group IIa element of the periodic table II, such as Sr, Ba) type superconductor In the case of manufacturing, a raw material powder containing each of the above elements is prepared.
前記原料粉末を作成するための１つの方法は、前記II
I a族元素粉末またはIII a族元素の化合物粉末（III a
族元素の酸化物粉末、塩化物粉末、炭酸塩粉末等）と、
前記II a族元素粉末またはII a族元素の化合物粉末と、
酸化銅粉末を用意し、各粉末を目的とする超電導材料の
組成となるように混合して原料粉末を得る粉末混合法で
ある。なお、前記混合粉末中に、酸化物超電導体を構成
する元素以外の不要元素が含有されている場合は、前記
混合粉末を500〜900℃程度に所要時間加熱して不要成分
をガス化して除去する仮焼き処理を施す。また、前記混
合粉末は前記仮焼き粉末、あるいは仮焼き粉末と前記混
合粉末の混合物を用いても良い。One method for preparing the raw material powder is described in II.
Group Ia element powder or Group IIIa element compound powder (IIIa
Group element oxide powder, chloride powder, carbonate powder, etc.),
With the group IIa group element powder or the compound powder of group IIa element,
This is a powder mixing method in which copper oxide powder is prepared, and each powder is mixed so as to have a composition of an intended superconducting material to obtain a raw material powder. When the mixed powder contains unnecessary elements other than the elements constituting the oxide superconductor, the mixed powder is heated to about 500 to 900 ° C for a required time to gasify and remove the unnecessary components. A calcination process is performed. The mixed powder may be the calcined powder, or a mixture of the calcined powder and the mixed powder.
なお、前記混合粉末を得る他の方法として、超電導体
を構成する元素を含む硝酸溶液から硝酸塩にして沈澱物
を得、この沈澱物を乾燥して混合粉末を得る、いわゆる
共沈法を行っても良い。As another method of obtaining the mixed powder, a so-called coprecipitation method is performed in which a nitrate is converted from a nitric acid solution containing an element forming a superconductor to obtain a precipitate, and the precipitate is dried to obtain a mixed powder. Is also good.
次に、前記混合粉末を粉末状態で、あるいは、ブロッ
ク状に成形した後に、電気炉などの加熱炉に挿入し、大
気中あるいは酸素ガス雰囲気などの酸化雰囲気中におい
て、900〜13000℃の温度で１〜100時間加熱して焼結す
る。この加熱処理によって混合粉末中の各元素が拡散反
応して焼結体が生成される。なお、前記加熱状態におい
て焼結体は高温であるために、その結晶構造は高温で安
定した正方晶となっている。Next, the mixed powder in a powder state, or after molding into a block shape, is inserted into a heating furnace such as an electric furnace, in the atmosphere or an oxidizing atmosphere such as an oxygen gas atmosphere, at a temperature of 900 ~ 13000 ℃. Sinter by heating for 1 to 100 hours. By this heat treatment, each element in the mixed powder undergoes a diffusion reaction to produce a sintered body. Since the sintered body is at a high temperature in the above heating state, its crystal structure is a stable tetragonal crystal at a high temperature.
所定時間の加熱処理が終了したならば、加熱炉内部に
純酸素を送り込むとともに、加熱炉内部の温度を低下さ
せて500〜400℃の温度まで冷却し、500〜400℃の温度域
で５〜48時間保持する。この温度域に保持することによ
って焼結体の正方晶が斜方晶に変化する。従って前記温
度域に保持する時間は、焼結体の正方晶が斜方晶に変態
するために十分な時間（６時間以上）保持することが望
ましい。When the heat treatment for a predetermined time is completed, pure oxygen is fed into the heating furnace, and the temperature inside the heating furnace is lowered to cool it to a temperature of 500 to 400 ° C. Hold for 48 hours. By keeping in this temperature range, the tetragonal crystal of the sintered body changes to the orthorhombic crystal. Therefore, it is desirable to hold the temperature in the temperature range for a sufficient time (6 hours or more) for the tetragonal crystal of the sintered body to transform into the orthorhombic crystal.
次いで前記温度に所定時間保持したならば、炉内を常
温まで冷却して超電導体を得る。このように製造された
超電導体にあっては、正方晶から斜方晶に変化する際
に、変態温度域を十分な時間保持しているために、正方
晶から斜方晶への変態が円滑に、かつ、高い割合でなさ
れており、斜方晶の割合の高い特性の優れた超電導体を
得ることができる。Next, if the temperature is maintained for the predetermined time, the inside of the furnace is cooled to room temperature to obtain a superconductor. In the superconductor manufactured in this way, since the transformation temperature range is maintained for a sufficient time when changing from tetragonal to orthorhombic, the transformation from tetragonal to orthorhombic is smooth. In addition, a superconductor having a high ratio of orthorhombic crystals and excellent characteristics can be obtained.
また、本発明者らが種々の実験を重ねたところ、正方
晶から斜方晶に変態する際に、十分な酸素が供給されな
いと変態は緩やかになされ、変態終了に要する時間が長
くなることを見出している、従って前記冷却処理は酸素
雰囲気あるいは酸素気流雰囲気または大気圧以上の酸素
雰囲気で行うことが好ましい。Further, the inventors of the present invention have conducted various experiments and found that, when transforming from tetragonal to orthorhombic, the transformation is gradual if sufficient oxygen is not supplied, and the time required to complete the transformation becomes longer. Therefore, it is preferable to carry out the cooling treatment in an oxygen atmosphere, an oxygen stream atmosphere, or an oxygen atmosphere at atmospheric pressure or higher.
この点において前記例においては、純酸素を供給して
十分な酸素のもとで正方晶から斜方晶に変態させている
ために、斜方晶への変化割合を向上させることができ、
高品質の超電導体を得ることができる。更に、前述の方
法を実施する場合、結晶変態時に十分な酸素量を供給で
きるので、原料粉末の焼結時に供給する酸素の制御条件
が緩くなり、焼結時に必要な酸素量を従来より少なくす
ることができるようになるために、焼結時に純酸素ガス
の代わりに通常濃度の酸素ガスを流すことでも充分高品
質の超電導体を製造できるようになり、製造コストを低
減できる効果がある。In this respect, in the above example, since pure oxygen is supplied to transform the tetragonal system to the orthorhombic system under sufficient oxygen, the rate of change to the orthorhombic system can be improved,
A high quality superconductor can be obtained. Furthermore, when the above-mentioned method is carried out, a sufficient amount of oxygen can be supplied at the time of crystal transformation, so the control conditions of oxygen supplied at the time of sintering the raw material powder are loosened, and the amount of oxygen required at the time of sintering is made smaller than before. Therefore, it is possible to produce a sufficiently high-quality superconductor by flowing an oxygen gas of a normal concentration instead of pure oxygen gas during sintering, and it is possible to reduce the production cost.
ところで、前述のように製造された超電導体は、粉末
状に粉砕されて金属管の内部に充填された後に縮径さ
れ、超電導線や超電導マグネットを製造するために用い
られたり、ベヒクル中に混入されて超電導ペーストを製
造するために用いられるなど、超電導応用機器一般に適
用するために用いられる。By the way, the superconductor manufactured as described above is crushed into a powder and filled in the metal tube and then reduced in diameter, used for manufacturing a superconducting wire or a superconducting magnet, or mixed in a vehicle. And is used for manufacturing superconducting paste, for example, for general application of superconducting equipment.
「実施例」 超電導体を製造するために、Y2O3粉末とBaCO3粉末とC
uO粉末をY:Ba:Cu＝1:2:3となるように混合して原料粉末
を得るとともに、この原料粉末を電気炉に挿入し、大気
中において900℃で24時間加熱する加熱処理を行った。
その後、電気炉に純酸素ガスを送入しつつ冷却を行い、
30分で475℃まで冷却した。次いで純酸素を流した状態
で電気炉の炉内温度を475℃のまま６時間保持した後
に、１時間で475℃から室温まで冷却し超電導体を得
た。[Example] To produce a superconductor, Y 2 O 3 powder, BaCO 3 powder and C
uO powder is mixed so that Y: Ba: Cu = 1: 2: 3 to obtain a raw material powder, and this raw material powder is inserted into an electric furnace and heated at 900 ° C. for 24 hours in the air. went.
After that, cooling while feeding pure oxygen gas into the electric furnace,
It cooled to 475 degreeC in 30 minutes. Then, the temperature inside the electric furnace was kept at 475 ° C. for 6 hours while flowing pure oxygen, and then cooled from 475 ° C. to room temperature in 1 hour to obtain a superconductor.
この超電導体は92Kで電気抵抗がゼロとなった。ちな
みに、この臨界温度は、前記原料粉末を大気中で24時間
かけて加熱した焼結体を更に24時間かけて酸素中で炉冷
して得た超電導体試料の臨界温度と同等のものであっ
た。This superconductor has zero electrical resistance at 92K. By the way, this critical temperature is equivalent to the critical temperature of a superconductor sample obtained by furnace-cooling a sintered body obtained by heating the above-mentioned raw material powder in the air for 24 hours for another 24 hours. It was
従って本発明を実施することにより冷却時間を短縮で
きることが明らかであり、温度を500℃に維持すること
によって正方晶から斜方晶への変態を効率良く進行させ
うることが判明した。Therefore, it is apparent that the cooling time can be shortened by carrying out the present invention, and it was revealed that the transformation from the tetragonal system to the orthorhombic system can be efficiently advanced by maintaining the temperature at 500 ° C.
「発明の効果」 以上説明したように本発明は、Ａ−Ｂ−Cu−Ｏ（ただ
し、ＡはLa,Ce,Y,Sc,Ybなどの周期律表III a族元素の１
種以上を示し、ＢはSr,Baの周期律表II a族元素の１種
以上を示す）系の超電導体を構成する元素を含有した原
料粉末または成形体を加熱処理して得た焼結体を冷却す
る際に、焼結体の結晶が正方晶から斜方晶に変態する50
0〜400℃の温度域に酸素雰囲気で５〜48時間保持した後
に常温まで冷却する方法であり、変態温度域に保持する
間に斜方晶への変態を進行させるために、焼結体内部の
より多くの正方晶を斜方晶に変態させて超電導体を生成
することができ、特性の優秀な超電導体を製造できる効
果がある。"Effects of the Invention" As described above, the present invention provides AB-Cu-O (where A is La, Ce, Y, Sc, Yb, etc., which is one of Group IIIa elements of the periodic table).
B or more, and B represents one or more elements of Group IIa of the Periodic Table of Sr and Ba) Sintered by heat-treating a raw material powder or compact containing an element constituting a superconductor of the system When the body is cooled, the crystal of the sintered body transforms from tetragonal to orthorhombic 50
This is a method of cooling in an oxygen atmosphere in the temperature range of 0 to 400 ° C for 5 to 48 hours and then cooling to room temperature. In order to promote the transformation to the orthorhombic crystal while keeping it in the transformation temperature range, It is possible to transform more tetragonal crystals into orthorhombic crystals to produce a superconductor, and there is an effect that a superconductor having excellent characteristics can be manufactured.
更に、従来のように焼結体を高温から常温まで一定割
合で徐冷して変態効率を向上させる場合に比較し、本発
明においては変態温度域以外の温度域での冷却速度を速
くすることができるので、本発明を実施することにより
冷却時間を短縮することができ、製造コストが安くなる
効果がある。Further, in the present invention, in order to improve the transformation efficiency by gradually cooling the sintered body from a high temperature to a room temperature at a constant rate as in the conventional case, the cooling rate in the temperature range other than the transformation temperature range should be increased. Therefore, by implementing the present invention, the cooling time can be shortened and the manufacturing cost can be reduced.
また、加熱後の冷却時に500〜400℃の一定温度域に保
持して酸素を供給するならば、正方晶が斜方晶に変態す
る際に十分な酸素を補給できるので、結晶変態を高効率
で円滑に進行させることができ、特性の優れた超電導体
を得ることができる。Also, if oxygen is supplied while being kept in a constant temperature range of 500 to 400 ° C during cooling after heating, sufficient oxygen can be supplied when the tetragonal crystal transforms into the orthorhombic crystal, so the crystal transformation is highly efficient. It is possible to obtain a superconductor having excellent characteristics that can be smoothly advanced.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｈ０１Ｂ 12/00 Ｃ０４Ｂ 35/00 ＺＡＡＫ (72)発明者 杉本 優 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (72)発明者 中川 三紀夫 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (72)発明者 青木 伸哉 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (56)参考文献 特開 昭63−274652（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication location // H01B 12/00 C04B 35/00 ZAAK (72) Inventor Yu Sugimoto 1 Kiba, Koto-ku, Tokyo 5-1 Fujikura Electric Cable Co., Ltd. (72) Inventor Mikio Nakagawa 1-15-1 Kiba, Koto-ku, Tokyo Fujikura Electric Cable Co., Ltd. (72) Shinya Aoki 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric Cable Co., Ltd. (56) Reference JP-A-63-274652 (JP, A)
Claims (1)
c,Ybなどの周期律表III a族元素の１種以上を示し、Ｂ
はSr,Baの周期律表II a族元素の１種以上を示す）系の
超電導体の構成元素を含む原料粉末あるいは原料粉末成
形体を作成し、原料粉末あるいは原料粉末成形体に加熱
処理を施して焼結し、その後に冷却することにより超電
導体を製造するに際し、前記加熱処理後の冷却処理中
に、焼結体の結晶構造が正方晶から斜方晶に変態する50
0〜400℃の温度域に前記焼結体の温度を酸素雰囲気で５
〜48時間維持するとともに、前記温度の維持後に常温ま
で冷却することを特徴とする酸化物超電導体の製造方
法。1. A-B-Cu-O (where A is La, Ce, Y, S
C, Yb, etc., showing at least one group IIIa element of the periodic table, B
Is a raw material powder or a raw material powder compact containing constituent elements of a superconductor of the group IIa of the periodic table II of Sr, Ba), and heat-treats the raw material powder or the raw material powder compact. When applied to sinter, and then to produce a superconductor by cooling, during the cooling treatment after the heat treatment, the crystal structure of the sintered body is transformed from tetragonal to orthorhombic 50
The temperature of the above-mentioned sintered body is set to 0 to 400 ° C in an oxygen atmosphere at 5
A method for producing an oxide superconductor, which is characterized by maintaining the temperature for 48 hours and then cooling it to room temperature after maintaining the temperature.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62168104A JP2557062B2 (en) | 1987-07-06 | 1987-07-06 | Method for manufacturing oxide superconductor |
| EP88302417A EP0283313B1 (en) | 1987-03-20 | 1988-03-18 | Method of producing oxide superconducting wire and oxide superconducting wire produced by this method |
| DE3887910T DE3887910T2 (en) | 1987-03-20 | 1988-03-18 | Method for producing a wire made of superconducting oxide and wire produced therewith. |
| CN88101444.3A CN1027937C (en) | 1987-03-20 | 1988-03-19 | Method of producting oxide superconducting wire and oxide superconducting wire produced by this method |
| EP88304251A EP0297707A3 (en) | 1987-06-27 | 1988-05-11 | Superconductive electric wire and method for making it |
| CA000566642A CA1338460C (en) | 1987-06-27 | 1988-05-12 | Method for making superconductive electric wire |
| CN88103946.2A CN1030324A (en) | 1987-06-27 | 1988-06-25 | Superconduction electric wire and manufacture method thereof |
| US07/831,663 US5168127A (en) | 1987-03-20 | 1992-02-06 | Oxide superconducting wire |
| US07/932,933 US5283232A (en) | 1987-03-20 | 1992-08-20 | Method for producing oxide superconducting composite wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62168104A JP2557062B2 (en) | 1987-07-06 | 1987-07-06 | Method for manufacturing oxide superconductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6414148A JPS6414148A (en) | 1989-01-18 |
| JP2557062B2 true JP2557062B2 (en) | 1996-11-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62168104A Expired - Fee Related JP2557062B2 (en) | 1987-03-20 | 1987-07-06 | Method for manufacturing oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2557062B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2593480B2 (en) * | 1987-07-28 | 1997-03-26 | 昭二 田中 | Manufacturing method of oxide superconductor |
| DE3731266A1 (en) * | 1987-09-17 | 1989-04-06 | Kernforschungsz Karlsruhe | COVER MATERIAL FOR SUPRAL-CONDUCTING WIRE |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63274652A (en) * | 1987-04-30 | 1988-11-11 | Furukawa Electric Co Ltd:The | Method for elevating purity of ceramic superconductor to high level |
-
1987
- 1987-07-06 JP JP62168104A patent/JP2557062B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6414148A (en) | 1989-01-18 |
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