JPH06223648A - Bi oxide superconducting wire and manufacture thereof - Google Patents
Bi oxide superconducting wire and manufacture thereofInfo
- Publication number
- JPH06223648A JPH06223648A JP5012118A JP1211893A JPH06223648A JP H06223648 A JPH06223648 A JP H06223648A JP 5012118 A JP5012118 A JP 5012118A JP 1211893 A JP1211893 A JP 1211893A JP H06223648 A JPH06223648 A JP H06223648A
- Authority
- JP
- Japan
- Prior art keywords
- tape
- wire
- superconductor
- superconducting wire
- magnetic field
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000002887 superconductor Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005491 wire drawing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 3
- 229910052797 bismuth Inorganic materials 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910052745 lead Inorganic materials 0.000 abstract 1
- 229910052712 strontium Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Wire Processing (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は酸化物系の超電導線およ
びその製造方法に係り、特に金属シース法によるＢｉ系
酸化物超電導線およびその製造方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxide-based superconducting wire and a method for producing the same, and more particularly to improvement of a Bi-based oxide superconducting wire by a metal sheath method and a method for producing the same.
【０００２】[0002]
【従来の技術】酸化物系の高温超電導体は、その臨界温
度（Ｔｃ）が液体窒素温度（７７Ｋ）を越えることか
ら、エレクトロニクス、電力輸送、強磁界発生等の分野
での実用化が期待されており、現在ではその臨界電流密
度（Ｊｃ）も実用レベルに達しつつある。2. Description of the Related Art Oxide-based high-temperature superconductors have a critical temperature (Tc) above liquid nitrogen temperature (77K), and are expected to be put to practical use in the fields of electronics, electric power transportation, strong magnetic field generation, and the like. Therefore, the critical current density (Jc) is now reaching the practical level.
【０００３】酸化物超電導体の本格的な実用化のために
は、長尺化、即ち、線材化技術を確立することかが不可
欠であり、その有力な方法の一つとして金属シース法
（Ａｇシース法）が知られている。In order to put oxide superconductors into full-scale practical use, it is indispensable to make them longer, that is, to establish a wire rod technology. One of the influential methods is the metal sheath method (Ag). The sheath method) is known.
【０００４】この方法は、酸化物超電導物質の構成元素
を所定のモル比で配合した混合粉末や仮焼粉末を銀バイ
プ中に充填し、これを伸線加工や圧延加工等により線状
に加工した後、熱処理を施すもので、Ａｇを使用するの
は加工性に優れる上、熱処理中に内部の酸化物と反応せ
ず、またＡｇが実質的に酸素透過機能を有することによ
る。According to this method, a mixed powder or a calcined powder in which the constituent elements of the oxide superconducting material are mixed in a predetermined molar ratio is filled in a silver vapor, and this is processed into a linear shape by wire drawing or rolling. After that, heat treatment is performed, and the reason why Ag is used is that it has excellent workability, does not react with the internal oxide during heat treatment, and that Ag has a substantially oxygen-permeable function.
【０００５】このＡｇシース法は、特にＢｉ系超電導体
の場合、各結晶粒が板状組織を有することから伸線、圧
延等の機械的な加工により圧縮力を加えることによって
結晶の配向性を高めることができ、その結果Ｊｃを向上
させることができる利点がある。In the Ag sheath method, particularly in the case of a Bi type superconductor, since each crystal grain has a plate-like structure, the crystal orientation is obtained by applying a compressive force by mechanical processing such as wire drawing or rolling. There is an advantage that it can be increased and, as a result, Jc can be improved.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
Ｂｉ系超電導体の電気的な特性は、磁場中で異方性を有
し、結晶のｃ軸に対して平行に磁場が作用した場合、臨
界電流密度が急激に減少することが知られている。However, the electrical characteristics of the above Bi-based superconductor have anisotropy in a magnetic field, and when the magnetic field acts parallel to the c-axis of the crystal, the critical characteristics are obtained. It is known that the current density sharply decreases.
【０００７】上記のＡｇシース法でテープ状の超電導線
線を製造する場合、前述のように結晶の配向性を高める
ことができるが、テープの幅広面とａ−ｂ面が平行とな
り、従ってテープの幅広面に対してｃ軸が垂直に配向す
ることになるため、テープの幅広面に垂直な磁場が作用
すると特性が著しく低下する。When a tape-shaped superconducting wire is manufactured by the Ag sheath method described above, the crystal orientation can be enhanced as described above, but the wide surface of the tape and the ab surface are parallel, and therefore the tape Since the c-axis is oriented perpendicularly to the wide surface of the tape, the characteristics remarkably deteriorate when a magnetic field perpendicular to the wide surface of the tape acts.
【０００８】従って、このようなテープ状の超電導線を
用いてコイルを形成し磁場を発生させると、自己磁場が
テープの幅広面に対して垂直に加わる部分でその特性が
低下することとなる。Therefore, when a coil is formed by using such a tape-shaped superconducting wire and a magnetic field is generated, the characteristics are deteriorated in the portion where the self-magnetic field is applied perpendicularly to the wide surface of the tape.
【０００９】本発明は上記の問題を解決するためになさ
れたもので、金属シース法による磁場中での電気的な異
方性を改善したテープ状のＢｉ系酸化物超電導線および
その製造方法を提供することをその目的とする。The present invention has been made in order to solve the above problems, and provides a tape-shaped Bi-based oxide superconducting wire with improved electrical anisotropy in a magnetic field by a metal sheath method and a method for producing the same. Its purpose is to provide.
【００１０】[0010]
【課題を解決するための手段】上記の問題を解決するた
めに、本発明のＢｉ系酸化物超電導線は、Ｂｉ系の酸化
物超電導体の外側に金属シースを有し、テープ状に成形
された超電導線において、超電導体のｃ軸とテープの幅
広面に垂直な方向とのなす角がテープの軸方向に垂直な
面内において周期的に変化するように超電導体の結晶を
配向させたものである。In order to solve the above problems, the Bi type oxide superconducting wire of the present invention has a metal sheath on the outside of the Bi type oxide superconductor and is formed into a tape shape. In a superconducting wire, crystals of the superconductor are oriented such that the angle formed by the c-axis of the superconductor and the direction perpendicular to the wide surface of the tape changes periodically in the plane perpendicular to the axial direction of the tape. Is.
【００１１】このような超電導線は、本願第２の発明、
即ち、Ｂｉ系の酸化物超電導体を構成する元素を所定の
モル比で含む原料粉末を金属管中に収容し、これに伸線
加工を施した後、１パス当たり２０％以上の圧下率で圧
延加工を施してテープ状の線材を形成し、次いで熱処理
を施すことにより製造することができる。Such a superconducting wire is the second invention of the present application,
That is, the raw material powder containing the elements constituting the Bi-based oxide superconductor in a predetermined molar ratio was housed in a metal tube, and after drawing the wire, a reduction rate of 20% or more per pass was applied. It can be manufactured by rolling to form a tape-shaped wire and then heat treatment.
【００１２】上記発明における金属シースまたは金属管
としては、展延性に優れ、かつ超電導体と反応せず、非
酸化性で非磁性の材料で、さらに、５００℃以上の温度
で実質的に酸素透過機能を有する例えば、Ａｇ，Ａｇ合
金等が用いられる。The metal sheath or metal tube in the above invention is a non-oxidizing, non-magnetic material which is excellent in ductility, does not react with a superconductor, and is substantially permeable to oxygen at a temperature of 500 ° C. or higher. For example, Ag or Ag alloy having a function is used.
【００１３】また、Ｂｉ系の酸化物超電導体の原料粉末
としては、超電導体を構成する元素を含む酸化物、炭酸
塩、硝酸塩等の粉末を所定のモル比で配合した混合粉末
や、この混合粉末を仮焼後粉砕した仮焼粉末が用いられ
る。As the raw material powder of the Bi-based oxide superconductor, a mixed powder obtained by mixing powders of oxides, carbonates, nitrates and the like containing the elements constituting the superconductor in a predetermined molar ratio, or a mixture thereof. A calcined powder obtained by pulverizing the powder after calcination is used.
【００１４】超電導線を製造する場合の圧延加工は、１
パス当たり２０％以上の圧下率で施されるが、これは圧
下率が２０％未満であると、製造後のテープ状線材の断
面において、超電導体に括れを生ぜず、従ってテープの
幅広面に対してｃ軸が垂直に配向することになるため、
磁場中での電気的な異方性を改善することができない。
また、圧下率が５０％前後になると、圧延中に金属シ
ースの破断を生ずるため、これ以下とする必要がある。
圧下率の好ましい範囲は３０〜４０％である。The rolling process for manufacturing a superconducting wire is 1
It is applied with a reduction rate of 20% or more per pass, but when the reduction rate is less than 20%, the superconductor is not constricted in the cross section of the tape-shaped wire rod after production, and thus the wide surface of the tape is On the other hand, since the c-axis is oriented vertically,
The electrical anisotropy in a magnetic field cannot be improved.
Further, when the rolling reduction is around 50%, the metal sheath is broken during rolling, and therefore the rolling reduction needs to be less than this.
The preferable range of the rolling reduction is 30 to 40%.
【００１５】[0015]
【作用】上記発明においては、超電導体のｃ軸とテープ
の幅広面に垂直な方向とのなす角がテープの軸方向に垂
直な面内において周期的に変化するため、結晶の大部分
のｃ軸がテープの幅広面に垂直に配向されることがなく
なり、磁場中での電気的な異方性が改善される。特にテ
ープの幅広面に垂直な磁場が作用した場合の特性の低下
が防止される。また、このようなテープ状の超電導線
は、金属シース法により１パス当たりの圧下率を規定し
て圧延加工を施すことにより製造することができる。In the above invention, since the angle formed by the c-axis of the superconductor and the direction perpendicular to the wide surface of the tape changes periodically in the plane perpendicular to the axial direction of the tape, most c of the crystal is formed. The axis is no longer oriented perpendicular to the wide face of the tape, improving the electrical anisotropy in a magnetic field. In particular, it is possible to prevent deterioration of characteristics when a magnetic field perpendicular to the wide surface of the tape acts. In addition, such a tape-shaped superconducting wire can be manufactured by performing a rolling process by defining a rolling reduction per pass by a metal sheath method.
【００１６】[0016]
【実施例】以下、本発明の一実施例について説明する。EXAMPLES An example of the present invention will be described below.
【００１７】実施例 Ｂｉ2 Ｏ3 ，ＰｂＯ、ＳｒＣＯ3 ，ＣａＣＯ3 ，ＣｕＯ
の各粉末を、Ｂｉ：Ｐｂ：Ｓｒ：Ｃａ：Ｃｕ＝１．８：
０．４：２．０：２．０：３．０のモル比で配合して湿
式混合法により混合した後、大気中、８４０℃の温度で
熱処理を施し、これを破砕して仮焼粉末を作製した。Example Bi 2 O 3 , PbO, SrCO 3 , CaCO 3 , CuO
Each powder of Bi: Pb: Sr: Ca: Cu = 1.8:
After being mixed in a molar ratio of 0.4: 2.0: 2.0: 3.0 and mixed by a wet mixing method, a heat treatment is performed at a temperature of 840 ° C. in the air, and this is crushed to give a calcined powder. Was produced.
【００１８】この仮焼粉末を外径φ７．０mm、内径φ
５．０mmのＡｇパイプ中に充填し、これに伸線加工を施
して外径φ１．０mmの丸線に成形した後、１パス当たり
３０％の圧下率で３パスの圧延加工を施して、厚さ０．
３mm、幅２．３mmのテープ状の線材を製造した。This calcinated powder was made to have an outer diameter of 7.0 mm and an inner diameter of φ.
It was filled in a 5.0 mm Ag pipe, drawn to form a round wire with an outer diameter of φ1.0 mm, and then rolled for 3 passes at a reduction rate of 30% per pass, Thickness 0.
A tape-shaped wire rod having a width of 3 mm and a width of 2.3 mm was manufactured.
【００１９】次いで、上記のテープ状の線材に８４０℃
で１００時間の熱処理を施して超電導テープを製造し
た。Then, the above tape-shaped wire was heated to 840 ° C.
Was heat-treated for 100 hours to produce a superconducting tape.
【００２０】このようにして得られた超電導テープの概
略断面を図２ａに示す。超電導テープ１は、超電導体２
の外側にＡｇシース３が配置された構造を有し、超電導
体２はその中央部で括れた形状を示す。同図ｂに示すよ
うに、超電導体２のｃ軸とテープ１の幅広面に垂直な方
向ｚとのなす角αは、テープの軸方向に垂直な面内のテ
ープの幅方向ｙにおいて周期的に変化する。A schematic cross section of the superconducting tape thus obtained is shown in FIG. 2a. Superconducting tape 1 is a superconductor 2
Has a structure in which an Ag sheath 3 is arranged outside, and the superconductor 2 has a shape constricted at its central portion. As shown in FIG. 2B, the angle α formed by the c-axis of the superconductor 2 and the direction z perpendicular to the wide surface of the tape 1 is periodic in the width direction y of the tape in the surface perpendicular to the axial direction of the tape. Changes to.
【００２１】また、この超電導テープ１の臨界電流密度
Ｊｃを、図３に示すようにテープ１の軸方向ｘに垂直な
面内において、テープ１の幅広面に平行な方向ｙと磁場
方向Ｈとのなす角をθとして、７７．３Ｋ、５００ガウ
スの条件で測定した。測定結果を、Ｊｃ（θ）／Ｊｃ
（θ＝０）の規格化した値で図１に示す。Further, the critical current density Jc of the superconducting tape 1 is expressed by a direction y parallel to the wide surface of the tape 1 and a magnetic field direction H in a plane perpendicular to the axial direction x of the tape 1 as shown in FIG. The angle formed by is defined as θ, and measurement is performed under the conditions of 77.3 K and 500 Gauss. The measurement result is Jc (θ) / Jc
The normalized value of (θ = 0) is shown in FIG.
【００２２】比較例 実施例と同様にして、仮焼粉末を作製後、この仮焼粉末
をＡｇパイプ中に充填し、これに伸線加工を施して外径
φ１．０mmの丸線に成形した。Comparative Example After preparing a calcined powder in the same manner as in the example, the calcined powder was filled in an Ag pipe and wire-drawn to form a round wire with an outer diameter of 1.0 mm. .
【００２３】次いで、１パス当たり１０％の圧下率で圧
延加工を施して、厚さ０．３mm、幅２．３mmのテープ状
の線材を製造した後、実施例と同様の熱処理を施して超
電導テープを製造した。Next, after rolling at a reduction rate of 10% per pass to manufacture a tape-shaped wire rod having a thickness of 0.3 mm and a width of 2.3 mm, the same heat treatment as in the example is applied to superconductivity. A tape was manufactured.
【００２４】このようにして得られた超電導テープの概
略断面を図４ａに示す。超電導テープ１´は、超電導体
２´の外側にＡｇシース３´が配置された構造を有する
が、超電導体２´は同図ｂに示すように、超電導体２´
のｃ軸とテープ１´の幅広面に垂直な方向ｚとが、テー
プの軸方向に垂直な面内のテープの幅方向ｙにおいて、
その両端部を除いてほぼ同一の方向を有する。A schematic cross section of the superconducting tape thus obtained is shown in FIG. 4a. The superconducting tape 1'has a structure in which an Ag sheath 3'is arranged outside the superconductor 2 ', but the superconductor 2'is, as shown in FIG.
And the direction z perpendicular to the wide surface of the tape 1'in the tape width direction y in the plane perpendicular to the tape axial direction,
Except for both ends thereof, they have almost the same direction.
【００２５】また、この超電導テープ１´の臨界電流密
度Ｊｃを、実施例と同様にして測定した結果を図１に示
した。Further, the result of measuring the critical current density Jc of this superconducting tape 1'in the same manner as in the example is shown in FIG.
【００２６】以上の実施例および比較例から明らかなよ
うに、本発明によるＢｉ系酸化物超電導線によれば磁場
中での電気的な異方性が改善され、特にテープの幅広面
に垂直な磁場が作用した場合のＪｃの低下を抑制するこ
とができる。As is clear from the above Examples and Comparative Examples, the Bi-based oxide superconducting wire according to the present invention has improved electrical anisotropy in a magnetic field, and in particular, it is perpendicular to the wide surface of the tape. It is possible to suppress a decrease in Jc when a magnetic field acts.
【００２７】[0027]
【発明の効果】以上述べたように、本発明のＢｉ系酸化
物超電導線によれば、磁場中での電気的な異方性が改善
され、テープの幅広面に垂直な磁場が作用した場合の特
性の低下を抑制することができる。また、このようなテ
ープ状の超電導線は、金属シース法により圧下率を規定
して圧延加工を施すことにより容易に製造することがで
きる。As described above, according to the Bi-based oxide superconducting wire of the present invention, the electrical anisotropy in the magnetic field is improved, and when the magnetic field perpendicular to the wide surface of the tape acts. It is possible to suppress the deterioration of the characteristics. In addition, such a tape-shaped superconducting wire can be easily manufactured by performing a rolling process by defining a reduction rate by a metal sheath method.
【図１】本発明の一実施例および比較例の方法により製
造されたＢｉ系酸化物超電導線の臨界電流密度の磁場方
向に対する依存性を示すグラフ。FIG. 1 is a graph showing the dependence of the critical current density of a Bi-based oxide superconducting wire manufactured by the method of one example of the present invention and the comparative example on the magnetic field direction.
【図２】（ａ）は本発明によるＢｉ系酸化物超電導線の
一実施例を示す概略断面図、（ｂ）はそのｃ軸とテープ
の幅広面に垂直な方向ｚとのなす角αの分布を示すグラ
フ。FIG. 2 (a) is a schematic cross-sectional view showing an embodiment of a Bi-based oxide superconducting wire according to the present invention, and FIG. 2 (b) is an angle α formed by the c-axis and a direction z perpendicular to the wide surface of the tape. Graph showing distribution.
【図３】図１における磁場方向Ｈを説明するための図。FIG. 3 is a diagram for explaining a magnetic field direction H in FIG.
【図４】（ａ）は比較例の方法によるＢｉ系酸化物超電
導線を示す概略断面図、（ｂ）はそのｃ軸とテープの幅
広面に垂直な方向ｚとのなす角αの分布を示すグラフ。4 (a) is a schematic cross-sectional view showing a Bi-based oxide superconducting wire by the method of the comparative example, and FIG. 4 (b) shows the distribution of the angle α formed by the c-axis and the direction z perpendicular to the wide surface of the tape. The graph that shows.
１、１´…超電導テープ ２、２´…超電導体 ３，３´…Ａｇシース 1, 1 '... Superconducting tape 2, 2' ... Superconductor 3, 3 '... Ag sheath
Claims (2)
ースを有し、テープ状に成形された超電導線において、
前記超電導体のｃ軸と前記テープの幅広面に垂直な方向
とのなす角が前記テープの軸方向に垂直な面内において
周期的に変化するように前記超電導体の結晶を配向させ
たことを特徴とするＢｉ系酸化物超電導線。1. A tape-shaped superconducting wire having a metal sheath on the outside of a Bi-based oxide superconductor,
Orienting the crystals of the superconductor such that the angle between the c-axis of the superconductor and the direction perpendicular to the wide surface of the tape changes periodically in the plane perpendicular to the axial direction of the tape. Characteristic Bi-based oxide superconducting wire.
を所定のモル比で含む原料粉末を金属管中に収容し、こ
れに伸線加工を施した後、１パス当たり２０％以上の圧
下率で圧延加工を施してテープ状の線材を形成し、次い
で熱処理を施すことを特徴とするＢｉ系酸化物超電導線
の製造方法。2. A raw material powder containing an element constituting a Bi-based oxide superconductor in a predetermined molar ratio is housed in a metal tube, which is subjected to wire drawing, and then 20% or more per pass. A method for producing a Bi-based oxide superconducting wire, which comprises rolling at a reduction ratio to form a tape-shaped wire, and then heat-treating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5012118A JPH06223648A (en) | 1993-01-28 | 1993-01-28 | Bi oxide superconducting wire and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5012118A JPH06223648A (en) | 1993-01-28 | 1993-01-28 | Bi oxide superconducting wire and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06223648A true JPH06223648A (en) | 1994-08-12 |
Family
ID=11796645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5012118A Withdrawn JPH06223648A (en) | 1993-01-28 | 1993-01-28 | Bi oxide superconducting wire and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06223648A (en) |
-
1993
- 1993-01-28 JP JP5012118A patent/JPH06223648A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
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