JPH0554735A - Manufacture of ceramic superconductor - Google Patents
Manufacture of ceramic superconductorInfo
- Publication number
- JPH0554735A JPH0554735A JP3213850A JP21385091A JPH0554735A JP H0554735 A JPH0554735 A JP H0554735A JP 3213850 A JP3213850 A JP 3213850A JP 21385091 A JP21385091 A JP 21385091A JP H0554735 A JPH0554735 A JP H0554735A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- heat treatment
- superconductor
- ceramic
- ceramics
- 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.)
- Pending
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
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マグネット、ケーブル
等に適用可能なセラミックス超電導導体の製造方法に関
し、特にＪｃ（臨界電流密度）特性に優れたＢｉ2 −Ｓ
ｒ2 −Ｃａ2 −Ｃｕ3 −Ｏｘ系セラミックス超電導導体
の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a ceramics superconducting conductor applicable to magnets, cables, etc., and particularly to Bi 2 -S excellent in Jc (critical current density) characteristics.
The method for producing a r 2 -Ca 2 -Cu 3 -Ox based ceramic superconductors.
【０００２】[0002]
【従来の技術】近年、Ｙ−Ｂａ−Ｃｕ−Ｏ系、（Ｂｉ，
Ｐｂ）−Ｓｒ−Ｃａ−Ｃｕ−Ｏ系、Ｔｌ−Ｂａ−Ｃａ−
Ｃｕ−Ｏ系等のように液体窒素温度を超えるＴｃ（臨界
温度）を有するセラミックス超電導体が知られている。
このようなセラミックス超電導体を例えば、マグネッ
ト、ケーブル等に適用するべく種々の形状に成型するこ
とが検討されている。2. Description of the Related Art In recent years, Y-Ba-Cu-O system, (Bi,
Pb) -Sr-Ca-Cu-O system, Tl-Ba-Ca-
Ceramic superconductors having a Tc (critical temperature) exceeding the temperature of liquid nitrogen such as Cu-O system are known.
For example, molding of such a ceramics superconductor into various shapes has been studied for application to magnets, cables, and the like.
【０００３】例えば、上記セラミックス超電導体を線材
に作製する方法としては、金属シース法が用いられてい
る。この方法は、超電導体となるセラミックス原料を金
属パイプ内に充填してビレットを形成し、これに減面加
工を施して所望形状・所望寸法の複合線材とし、その後
この複合線材に熱処理を施してセラミックス超電導導体
とするものである。For example, a metal sheath method is used as a method for producing the above ceramic superconductor into a wire. This method is to fill a metal pipe with a ceramic raw material to be a superconductor to form a billet, reduce the surface of the billet to form a composite wire with a desired shape and size, and then subject the composite wire to heat treatment. A ceramic superconducting conductor is used.
【０００４】得られる線材の形状としては、断面が円
形、楕円形、多角形等のもの、テープ状、あるいは線材
を複数本束ねてなる多芯線材、さらに金属シース内部に
セラミックス超電導体が同心円状、または渦巻状に多層
配置された多層線材等が挙げられる。The shape of the wire obtained is circular, elliptical, polygonal, etc., tape-shaped, or a multi-core wire made by bundling a plurality of wires, and a ceramic superconductor in a concentric circle inside the metal sheath. Alternatively, a multilayer wire rod or the like arranged in a spiral multilayer may be used.
【０００５】減面加工としては、押し出し、圧延、スウ
ェージング、引き抜き等従来の塑性加工法がそのまま適
用され、得られる線材の形状に応じて適宜選択される。As the surface-reducing work, the conventional plastic working methods such as extrusion, rolling, swaging and drawing are applied as they are, and are appropriately selected according to the shape of the wire to be obtained.
【０００６】金属シースの材質としては、熱伝導性、電
気伝導性に優れた材料、例えばＡｇ、Ａｇ合金、Ｃｕ、
Ｃｕ合金等が適用できる。この中で、酸素透過性が優れ
るＡｇ、Ａｇ合金を用いることが好ましい。As a material of the metal sheath, a material having excellent thermal conductivity and electrical conductivity, such as Ag, Ag alloy, Cu,
Cu alloy or the like can be applied. Among these, it is preferable to use Ag or Ag alloy, which has excellent oxygen permeability.
【０００７】Ｂｉ2 −Ｓｒ2 −Ｃａ2 −Ｃｕ3 −Ｏｘ系
（以下、Ｂｉ−２２２３系と省略する）超電導体をＡｇ
シース内に充填したＡｇシース線材に塑性加工と熱処理
とを繰り返して施してなるセラミックス超電導導体は、
より高いＪｃ特性を発揮することが明らかになってい
る。また、この場合、圧延加工、プレス加工等のように
圧縮を主体とした塑性加工を行うことにより、結晶方位
を所望方向に配向させることができ、Ｊｃをさらに向上
できることが明らかになっている。[0007] Bi 2 -Sr 2 -Ca 2 -Cu 3 -Ox system (hereinafter, abbreviated as Bi-2223-based) superconductors Ag
A ceramics superconducting conductor obtained by repeatedly performing plastic working and heat treatment on an Ag sheath wire filled in the sheath is
It has been clarified that it exhibits higher Jc characteristics. Further, in this case, it has been clarified that the crystal orientation can be oriented in a desired direction and the Jc can be further improved by performing plastic working mainly on compression such as rolling and pressing.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記の
セラミックス超電導導体の製造方法によれば、熱処理は
セラミックス原料の融点以下の温度で行なうため、その
Ｊｃ値が１００００Ａ／cm2 程度が限界であり、例えば
マグネット、ケーブル等への適用が阻害されてしまう。However, according to the above-mentioned method for manufacturing a ceramic superconducting conductor, the heat treatment is performed at a temperature below the melting point of the ceramic raw material, so that the Jc value is limited to about 10,000 A / cm 2 . For example, application to magnets, cables, etc. will be hindered.
【０００９】本発明はかかる点に鑑みてなされており、
マグネット、ケーブル等に適用することができ、優れた
Ｊｃ特性を発揮できるＢｉ２２２３系セラミックス超電
導導体を得ることができるセラミックス超電導導体の製
造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 points,
An object of the present invention is to provide a method for manufacturing a ceramics superconducting conductor, which can be applied to magnets, cables, etc. and can obtain a Bi2223 series ceramics superconducting conductor that can exhibit excellent Jc characteristics.
【００１０】[0010]
【課題を解決するための手段】本発明は、Ｂｉ2 −Ｓｒ
2 −Ｃａ2 −Ｃｕ3 −Ｏｘ系セラミックス超電導体原料
からなる部材と金属からなる部材とを複合化して複合体
を形成し、該複合体に減面加工および熱処理を複数回繰
り返して行いセラミックス超電導導体を得るセラミック
ス超電導導体の製造方法において、前記熱処理のうち最
終に行う熱処理を除く熱処理が、１回が前記超電導体原
料の部分溶融温度に保持する工程を含む熱処理、その他
が前記超電導体原料の部分溶融温度以下の温度で行う熱
処理であることを特徴とするセラミックス超電導導体の
製造方法を提供する。The present invention is directed to Bi 2 -Sr.
2 -Ca 2 -Cu 3 and members consisting -Ox system member and a metal consisting of ceramic superconductor material to form a composite to composite, ceramic superconductor was repeated several times reduction process and heat treatment complex In the method for producing a ceramic superconducting conductor for obtaining a conductor, the heat treatments other than the final heat treatment among the heat treatments include a step of holding once at a partial melting temperature of the superconductor raw material, and the other heat treatment of the superconductor raw material. Provided is a method for manufacturing a ceramics superconducting conductor, characterized in that the heat treatment is performed at a temperature not higher than a partial melting temperature.
【００１１】[0011]
【作用】本発明のセラミックス超電導導体の製造方法
は、熱処理のうち最終に行う熱処理を除く熱処理を１回
がセラミックス超電導体原料の部分溶融温度に保持する
熱処理、その他がセラミックス超電導体原料の部分溶融
温度以下の温度で行う熱処理としている。The method for producing a ceramics superconducting conductor according to the present invention comprises a heat treatment, which is one of the heat treatments except the final heat treatment, which is held at the partial melting temperature of the ceramics superconductor raw material, and the other is partial melting of the ceramics superconductor raw material. The heat treatment is performed at a temperature below the temperature.
【００１２】セラミックス超電導体原料の部分溶融温度
に保持する熱処理を施すことにより、セラミックス超電
導体の密度が向上する。また、異相の発生が抑えられ、
セラミックス超電導体の結晶方位が所望方向に配向さ
れ、これによりＪｃ特性の向上したセラミックス超電導
導体が得られる。The density of the ceramic superconductor is improved by performing the heat treatment for maintaining the partial melting temperature of the ceramic superconductor raw material. Also, the occurrence of out-of-phase is suppressed,
The crystallographic orientation of the ceramic superconductor is oriented in a desired direction, whereby a ceramic superconductor with improved Jc characteristics can be obtained.
【００１３】[0013]
【実施例】以下、本発明を詳細に説明する。The present invention will be described in detail below.
【００１４】まず、超電導体となしうるＢｉ−２２２３
系原料および金属からなる複合ビレットを作製する。そ
の方法は、従来の方法がそのまま適用できる。例えば、
酸化物、炭酸塩等のような一次原料粉をＢｉ−２２２３
系原料の組成となるように配合し充分に混合して混合粉
を得て、この混合粉を仮焼成して仮焼成体を形成し、こ
の仮焼成体を粉砕してＢｉ−２２２３系原料粉を得る。
あるいは、一次原料粉を加熱・溶融して融液とし、これ
を凝固させ塊状体を得て、この塊状体を粉砕してＢｉ−
２２２３系原料粉を得る。このようにして得られたＢｉ
−２２２３系原料粉を金属パイプ内に充填する。その充
填方法としては、タップ充填方法、原料粉を圧粉成型、
ＣＩＰ成型して金属パイプ内に挿入する方法、あるい
は、原料粉を圧粉成型、ＣＩＰ成型して得られた成型体
を焼結し、この焼結体を金属パイプ内に挿入する方法等
が挙げられる。また、一次原料粉を加熱・溶融して融液
とし、この融液を直接金属パイプ内に鋳込んで複合ビレ
ットを作製してもよい。First, Bi-2223 which can be used as a superconductor.
A composite billet composed of a raw material and a metal is produced. As the method, a conventional method can be applied as it is. For example,
Primary raw material powders such as oxides, carbonates, etc. are Bi-2223.
A raw material powder of Bi-2223 system is prepared by blending and mixing sufficiently to obtain a composition of a system raw material to obtain a mixed powder, calcining the mixed powder to form a calcined body, and pulverizing the calcined body. To get
Alternatively, the primary raw material powder is heated and melted to form a melt, which is solidified to obtain a lump, and the lump is crushed to obtain a Bi-
2223 series raw material powder is obtained. Bi thus obtained
The metal pipe is filled with −2223 series raw material powder. As the filling method, tap filling method, raw material powder compaction molding,
Examples include a method of CIP molding and inserting into a metal pipe, or a method of compacting raw material powder, sintering a molded body obtained by CIP molding, and inserting this sintered body into a metal pipe. Be done. Alternatively, the primary raw material powder may be heated and melted to form a melt, and the melt may be directly cast into a metal pipe to produce a composite billet.
【００１５】このようにして作製された複合ビレットを
所望形状、所望寸法に塑性加工する。ここで、塑性加工
としては、通常行われるスウェージング、押出、引抜、
圧延、プレス等の減面加工が挙げられる。特に、テープ
状のセラミックス超電導導体を得る場合は圧延加工また
はプレス加工が好ましい。この場合、複合ビレットに直
接圧延加工またはプレス加工を施してもよいが、圧延加
工またはプレス加工の前に例えばスウェージング加工、
押出加工等を施してもよい。The composite billet thus produced is plastically worked into a desired shape and a desired dimension. Here, as the plastic working, swaging, extrusion, drawing, which are usually performed,
Surface-reduction processing such as rolling and pressing can be mentioned. In particular, rolling or pressing is preferable when obtaining a tape-shaped ceramic superconducting conductor. In this case, the composite billet may be directly subjected to rolling or pressing, but before the rolling or pressing, for example, swaging,
You may give extrusion processing.
【００１６】次いで、減面加工された複合ビレットに第
１の中間熱処理（Ｈ１）を施す。次に、これに再度圧延
加工またはプレス加工を行い、さらに第２の中間熱処理
（Ｈ２）を施す。このようにして複合ビレットに順次減
面加工と熱処理とを繰り返し施し、最終熱処理を施して
セラミックス超電導導体を作製する。ここで、中間熱処
理の条件としては、中間熱処理（Ｈ１）、（Ｈ２）、
（Ｈ３）、…（Ｈｘ）のうち、いずれかの熱処理を前記
セラミックス超電導体原料の部分溶融温度に保持する工
程を含む熱処理とする。この熱処理は、セラミックス超
電導体原料がＢｉ２２２３系である場合、８５０〜８８
０℃程度の温度で行う。また、その温度における保持時
間には特に制約はないが、保持時間があまり長いと得ら
れるセラミックス超電導体に異相が多く発生するため約
２〜１０分程度であることが好ましい。また、この熱処
理は、部分溶融温度に所定の時間保持した後に、連続し
てそのセラミックス超電導体原料の凝固温度で保持して
もよい。また、セラミックス超電導体原料の部分溶融温
度に保持する熱処理を１回としたのは、この熱処理を２
回以上行うと得られるセラミックス超電導体に異相が発
生し、Ｊｃ特性を悪化させるからである。なお、中間熱
処理のうち、セラミックス超電導体原料の部分溶融温度
に保持する熱処理以外の熱処理は、セラミックス超電導
体原料の部分溶融温度以下の温度で行う。Next, the surface-reduced composite billet is subjected to a first intermediate heat treatment (H1). Next, this is again subjected to rolling or pressing, and then subjected to a second intermediate heat treatment (H2). In this way, the composite billet is successively subjected to surface-reduction processing and heat treatment, and finally heat-treated to produce a ceramics superconducting conductor. Here, the conditions of the intermediate heat treatment include intermediate heat treatments (H1), (H2),
Any of the heat treatments (H3), ... (Hx) is a heat treatment including a step of maintaining the partial melting temperature of the ceramic superconductor raw material. This heat treatment is performed at 850 to 88 when the ceramic superconductor raw material is Bi2223 system.
The temperature is about 0 ° C. The holding time at that temperature is not particularly limited, but if the holding time is too long, many different phases will occur in the obtained ceramic superconductor, so that it is preferably about 2 to 10 minutes. Further, this heat treatment may be continued at the solidification temperature of the ceramic superconductor raw material after being kept at the partial melting temperature for a predetermined time. Further, the reason why the heat treatment for maintaining the partial melting temperature of the ceramic superconductor raw material once is that this heat treatment is
This is because if it is performed more than once, a different phase is generated in the obtained ceramic superconductor, and the Jc characteristic is deteriorated. The intermediate heat treatments other than the heat treatment for maintaining the ceramic superconductor raw material at the partial melting temperature are performed at a temperature equal to or lower than the ceramic superconductor raw material partial melting temperature.
【００１７】本発明において得られるセラミックス超電
導導体の形状としては、単芯線材のほか、多芯線材ある
いは多層線材でもよい。The shape of the ceramic superconducting conductor obtained in the present invention may be a single-core wire, a multi-core wire or a multi-layer wire.
【００１８】実施例１ Ｂｉ2 Ｏ3 、ＰｂＯ、ＳｒＯ3 、ＣａＣＯ3 、ＣｕＯの
それぞれの一次原料粉をモル比でＢｉ：Ｐｂ：Ｓｒ：Ｃ
ａ：Ｃｕ＝１．６：０．４：２：２：３となるように配
合し充分に混合し、大気中で８００℃×５０時間仮焼成
し、得られた仮焼成体を粉砕して平均粒径が約５μｍで
ある仮焼粉を作製した。Example 1 Bi 2 O 3 , PbO, SrO 3 , CaCO 3 and CuO primary raw material powders in a molar ratio of Bi: Pb: Sr: C.
a: Cu = 1.6: 0.4: 2: 2: 3, and mixed sufficiently, and calcinated in the air at 800 ° C. for 50 hours, and the calcinated body obtained is crushed. A calcined powder having an average particle size of about 5 μm was produced.
【００１９】この仮焼粉をＣＩＰにより外径約１５mmφ
の円柱状体に成型した後、あらかじめ機械加工された外
径２５mmφ、内径１５mmφＡｇパイプ内に挿入して複合
ビレットを作製した。The calcined powder is CIP and the outer diameter is about 15 mmφ.
After being molded into a cylindrical body, the composite billet was prepared by inserting it into a machined machine having an outer diameter of 25 mmφ and an inner diameter of 15 mmφAg pipe.
【００２０】この複合ビレットにスウェージング加工を
施して外径を５mmφとした後、圧延加工を施して厚さ
０．７mmのテープ線材とした。これに第１の中間熱処理
を施した。さらにこれに圧延加工を施して厚さ０．４mm
とした後、第２の中間熱処理を施した。次いで、これに
圧延加工を施して厚さ０．３mmとした後、第３の中間熱
処理を施した。最後に圧延加工を施して厚さ０．２mmに
仕上げ、最終熱処理を施してテープ状のセラミックス超
電導導体を作製した。This composite billet was swaged to an outer diameter of 5 mmφ and then rolled to obtain a tape wire having a thickness of 0.7 mm. This was subjected to a first intermediate heat treatment. Furthermore, this is rolled to give a thickness of 0.4 mm.
After that, a second intermediate heat treatment was performed. Next, this was rolled to a thickness of 0.3 mm and then subjected to a third intermediate heat treatment. Finally, rolling was applied to finish the thickness to 0.2 mm, and final heat treatment was applied to produce a tape-shaped ceramic superconducting conductor.
【００２１】得られたテープ状のセラミックス超電導導
体について液体窒素温度、０磁場におけるＪｃおよびセ
ラミックス超電導体の密度（真密度に対する比）、並び
にセラミックス超電導体内部の異相の発生状況を調べ
た。その結果を下記表１に示す。ここで、第１〜第３の
中間熱処理、および最終熱処理のうち表１中Ａと記載し
たものは大気中、８３０℃×５０時間の熱処理であり、
Ｂと記載したものは上記セラミックス超電導体原料の部
分溶融温度である８５０〜８８０℃で２〜１０分保持し
た後、８３０℃に降温し、その温度で５０時間保持する
熱処理を表わす。With respect to the obtained tape-shaped ceramics superconducting conductor, liquid nitrogen temperature, Jc at zero magnetic field, density of ceramics superconducting conductor (ratio to true density), and occurrence of different phases inside the ceramics superconductor were examined. The results are shown in Table 1 below. Here, among the first to third intermediate heat treatments, and the final heat treatment, those described as A in Table 1 are heat treatments in air at 830 ° C. for 50 hours.
What is described as B represents a heat treatment in which the ceramic superconductor raw material is held at a partial melting temperature of 850 to 880 ° C. for 2 to 10 minutes, then cooled to 830 ° C., and held at that temperature for 50 hours.
【００２２】また、第１〜第３の中間熱処理の回数、セ
ラミックス超電導体原料の部分溶融温度に保持する工程
を含む熱処理を行う順序を変えて得られた他の本発明例
１〜８および比較例１〜４についての結果も下記表１に
併記する。Further, other examples 1 to 8 of the present invention obtained by changing the number of times of the first to third intermediate heat treatments and the order of performing the heat treatments including the step of maintaining the ceramics superconductor raw material at the partial melting temperature, and comparative examples The results for Examples 1 to 4 are also shown in Table 1 below.
【００２３】[0023]
【表１】 [Table 1]
【００２４】実施例２ 中間熱処理後に複合ビレットに施す減面加工を２０Ton/
cm2 の圧力によるプレス加工とすること以外は実施例１
と同様にして本発明例９〜１６および比較例５〜８のテ
ープ状セラミックス超電導導体を作製した。Example 2 The surface reduction processing applied to the composite billet after the intermediate heat treatment is 20 Ton /
Example 1 except that press working was performed with a pressure of cm 2.
In the same manner as above, tape-shaped ceramic superconducting conductors of Inventive Examples 9 to 16 and Comparative Examples 5 to 8 were produced.
【００２５】得られたテープ状のセラミックス超電導導
体について実施例１と同様にして液体窒素温度、０磁場
におけるＪｃおよびセラミックス超電導体の密度、並び
にセラミックス超電導体内部の異相の発生状況を調べ
た。その結果を下記表２に示す。With respect to the obtained tape-shaped ceramics superconducting conductor, in the same manner as in Example 1, the liquid nitrogen temperature, Jc at 0 magnetic field, the density of the ceramics superconducting substance, and the state of occurrence of different phases inside the ceramics superconducting substance were examined. The results are shown in Table 2 below.
【００２６】[0026]
【表２】 [Table 2]
【００２７】表１および表２から明らかなように、本発
明の方法により得られたセラミックス超電導導体（本発
明例１〜１４）は、密度が高く、異相の発生が充分抑え
られ、しかもＪｃが高いものであった。これに対して、
セラミックス超電導体原料の部分溶融温度に保持する工
程を含む熱処理を最終の熱処理としたもの（比較例１，
３，５，７）、セラミックス超電導体原料の部分溶融温
度に保持する工程を含む熱処理を施さなかったもの（比
較例２，６）、セラミックス超電導体原料の部分溶融温
度に保持する工程を含む熱処理を２回施したもの（比較
例３，７）、セラミックス超電導体原料の部分溶融温度
を超える温度に保持したもの（比較例４，８）は、密
度、異相の発生、またはＪｃのいずれかに問題があっ
た。As is clear from Tables 1 and 2, the ceramic superconducting conductors (Examples 1 to 14 of the present invention) obtained by the method of the present invention have a high density, the occurrence of different phases is sufficiently suppressed, and Jc is small. It was expensive. On the contrary,
A heat treatment including a step of maintaining the partial melting temperature of the ceramic superconductor raw material as the final heat treatment (Comparative Example 1,
3, 5, 7), which is not subjected to the heat treatment including the step of maintaining the partial melting temperature of the ceramics superconductor raw material (Comparative Examples 2 and 6), and heat treatment including the step of maintaining the partial melting temperature of the ceramics superconductor raw material. Those subjected to 2 times (Comparative Examples 3 and 7) and those maintained at a temperature higher than the partial melting temperature of the ceramic superconductor raw material (Comparative Examples 4 and 8) are either density, occurrence of different phases, or Jc. There was a problem.
【００２８】[0028]
【発明の効果】以上説明した如く本発明のセラミックス
超電導導体の製造方法は、優れたＪｃ特性を発揮できる
Ｂｉ−２２２３系セラミックス超電導導体を得ることが
できる。As described above, according to the method for producing a ceramics superconducting conductor of the present invention, it is possible to obtain a Bi-2223 series ceramics superconducting conductor which can exhibit excellent Jc characteristics.
Claims (1)
系セラミックス超電導体原料からなる部材と金属からな
る部材とを複合化して複合体を形成し、該複合体に減面
加工および熱処理を複数回繰り返して行いセラミックス
超電導導体を得るセラミックス超電導導体の製造方法に
おいて、前記熱処理のうち最終に行う熱処理を除く熱処
理が、１回が前記超電導体原料の部分溶融温度に保持す
る工程を含む熱処理、その他が前記超電導体原料の部分
溶融温度以下の温度で行う熱処理であることを特徴とす
るセラミックス超電導導体の製造方法。1. Bi 2 —Sr 2 —Ca 2 —Cu 3 —Ox
For manufacturing a ceramics superconducting conductor by compounding a member made of a ceramic-based ceramics superconductor raw material and a member made of a metal to form a composite, and subjecting the composite to repeated surface reduction processing and heat treatment a plurality of times to obtain a ceramics superconducting conductor In the above heat treatment, the heat treatments other than the heat treatment finally performed include a heat treatment including a step of maintaining the partial melting temperature of the superconductor raw material once, and the other heat treatments performed at a temperature equal to or lower than the partial melting temperature of the superconductor raw material. And a method for manufacturing a ceramics superconducting conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3213850A JPH0554735A (en) | 1991-08-26 | 1991-08-26 | Manufacture of ceramic superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3213850A JPH0554735A (en) | 1991-08-26 | 1991-08-26 | Manufacture of ceramic superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0554735A true JPH0554735A (en) | 1993-03-05 |
Family
ID=16646056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3213850A Pending JPH0554735A (en) | 1991-08-26 | 1991-08-26 | Manufacture of ceramic superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0554735A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022563A1 (en) * | 2003-08-28 | 2005-03-10 | Sumitomo Electric Industries, Ltd. | Method for producing oxide superconducting wire material, method for modifying oxide superconducting wire material, and oxide superconducting wire material |
-
1991
- 1991-08-26 JP JP3213850A patent/JPH0554735A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022563A1 (en) * | 2003-08-28 | 2005-03-10 | Sumitomo Electric Industries, Ltd. | Method for producing oxide superconducting wire material, method for modifying oxide superconducting wire material, and oxide superconducting wire material |
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