JPH1064350A - Method for producing oxide superconducting conductor and melt solidification apparatus - Google Patents
Method for producing oxide superconducting conductor and melt solidification apparatusInfo
- Publication number
- JPH1064350A JPH1064350A JP8213814A JP21381496A JPH1064350A JP H1064350 A JPH1064350 A JP H1064350A JP 8213814 A JP8213814 A JP 8213814A JP 21381496 A JP21381496 A JP 21381496A JP H1064350 A JPH1064350 A JP H1064350A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- rod
- sintered rod
- material sintered
- 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.)
- Granted
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
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
(57)【要約】
【課題】 高電流密度特性を備えた酸化物超電導導体を
製造効率良く得ること。
【解決手段】 原料焼結ロッド５１に形成する超電導部
５１ｂの長さ以上の高さを有する加熱部を備えた加熱手
段を用いてロッド５１をその側面側から加熱して溶融し
た後、ロッド５１をこれの長さ方向に沿った軸方向Ｘお
よびこの軸方向Ｘに直交する直交方向Ｙに移動させなが
ら凝固する酸化物超電導導体の製造方法と、超電導部５
１ｂの長さ以上の高さＨを有する炉本体４３と、ロッド
５１を保持するとともにこれを方向Ｘおよび方向Ｙに移
動させる移動機構とが少なくとも備えられ、炉本体４３
の側面にはロッド５１を通す凹状溝４３ｂが高さ方向に
沿って形成され、かつ溝４３ｂの壁面にロッド５１をそ
の側面側から加熱して溶融する多数のヒータ４７からな
る加熱部が高さ方向に沿って設けられ、該加熱部は超電
導部５１ｂの長さ以上の高さを有するものである溶融凝
固装置。
(57) [Problem] To provide an oxide superconducting conductor having high current density characteristics with high production efficiency. SOLUTION: After heating a rod 51 from a side surface thereof using a heating means having a heating portion having a height equal to or longer than a length of a superconducting portion 51b formed on a raw material sintered rod 51, the rod 51 is melted. And a method for manufacturing an oxide superconducting conductor which solidifies while being moved in an axial direction X along the longitudinal direction thereof and an orthogonal direction Y perpendicular to the axial direction X, and a superconducting portion 5.
At least a furnace body 43 having a height H equal to or longer than the length 1b, and a moving mechanism for holding the rod 51 and moving the rod 51 in the directions X and Y are provided.
A concave portion 43b through which the rod 51 passes is formed in the side surface of the groove 43b along the height direction, and a heating portion including a plurality of heaters 47 for heating and melting the rod 51 from the side surface thereof on the wall surface of the groove 43b has a height. A melt-solidification apparatus provided along a direction, wherein the heating section has a height equal to or longer than the length of the superconducting section 51b.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、極低温の冷媒中に
浸漬された超電導機器に給電するための超電導電流リー
ド線などに用いられる酸化物超電導導体を溶融凝固法に
より製造する酸化物超電導導体の製造方法及びこの製造
方法の実施に好適に用いられる溶融凝固装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxide superconducting conductor for producing a superconducting current conductor used for a superconducting current lead wire for supplying power to a superconducting device immersed in a cryogenic refrigerant by a melt-solidification method. And a melt-solidification apparatus suitably used for implementing the method.
【０００２】[0002]
【従来の技術】一般に、交流超電導コイル、超電導変圧
器などの超電導機器は、液体ヘリウムなどの極低温冷媒
中に浸漬して用いられ、それらの機器から導出された超
電導導線は、冷媒中で、外部電源から導かれた電流リー
ド線に接続されている。ここでの電流リード線として
は、常電導性のものよりも、超電導性のものの使用が望
ましいとされている。そこで、超電導電流リード線とし
て、Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導導体の使用が考えられ
ている。2. Description of the Related Art Generally, superconducting devices such as an AC superconducting coil and a superconducting transformer are used by being immersed in a cryogenic refrigerant such as liquid helium, and a superconducting wire derived from those devices is used in a refrigerant. Connected to a current lead led from an external power supply. It is considered that a superconducting wire is more preferable than a normal conducting wire. Therefore, use of a Y-Ba-Cu-O-based superconducting conductor as a superconducting current lead wire has been considered.
【０００３】この種のＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体
の従来の製造方法としては、まず、Ｙ−Ｂａ−Ｃｕ−Ｏ
系超電導材料粉末を成形後、焼結して原料焼結ロッドを
作製し、ついで、この原料焼結ロッドを溶融凝固法によ
り溶融凝固することにより得られる。原料焼結ロッドを
溶融凝固する従来の溶融凝固装置としては、図４に示す
ような円環状の電気炉が用いられていた。この電気炉２
０は、円環状のものであり、その中央には作製した原料
焼結ロッド２１を通すための孔２３が設けられ、さら
に、この孔２３の周囲にヒータ２５が設けられており、
前記孔２３内に通した原料焼結ロッド２１を部分的に加
熱して溶融できるようになっているものである。このよ
うな円環状の電気炉２０を用いて原料焼結ロッドを溶融
凝固するには、原料焼結ロッド２１の上端部側から電気
炉２０内に導入し、該原料焼結ロッド２１を長さ方向に
沿った軸２６を中心にして回転させながら徐々に上方
（軸２６方向に沿った方向）に引き上げることにより、
原料焼結ロッド２１に部分的に形成された溶融帯２９を
上端部側から下端部側に徐々に移動させるとともに電気
炉２０から導出された部分を冷やして凝固させて、溶融
を経て凝固した凝固部にＹ−Ｂａ−Ｃｕ−Ｏ系超電導体
の結晶を成長させていた。[0003] As a conventional method for manufacturing this type of Y-Ba-Cu-O-based superconductor, first, Y-Ba-Cu-O is used.
The raw material sintered rod is prepared by molding and then sintering the raw material superconducting material powder, and then the raw material sintered rod is melt-solidified by a melt-solidification method. As a conventional melt-solidification apparatus for melting and solidifying a raw material sintered rod, an annular electric furnace as shown in FIG. 4 has been used. This electric furnace 2
Reference numeral 0 denotes an annular shape, and a hole 23 for passing the produced raw material sintered rod 21 is provided at the center thereof, and a heater 25 is provided around the hole 23.
The raw material sintered rod 21 passed through the hole 23 can be partially heated and melted. In order to melt and solidify the raw material sintered rod using such an annular electric furnace 20, the raw material sintered rod 21 is introduced into the electric furnace 20 from the upper end side, and the raw material sintered rod 21 is lengthened. By gradually lifting upward (direction along the direction of the axis 26) while rotating about the axis 26 along the direction,
The molten zone 29 formed partially on the raw material sintered rod 21 is gradually moved from the upper end side to the lower end side, and the part led out of the electric furnace 20 is cooled and solidified, and solidified through melting. The crystal of the Y—Ba—Cu—O-based superconductor was grown in the portion.
【０００４】また、従来の溶融凝固装置の他の例として
は、図５に示すような反射炉３０が用いられていた。こ
の反射炉３０は、二枚の反射鏡３１，３１をその凹部３
１ａ，３１ａが対向するように配設してなる縦断面形状
が略楕円状のものであり、中央には作製した原料焼結ロ
ッド２１を通すための孔３３が設けられ、さらに各反射
鏡３１の楕円焦点に赤外線ランプ３５がそれぞれ設けら
れており、前記孔３３内に通された原料焼結ロッド２１
を部分的に加熱して溶融できるようになっているもので
ある。このような反射炉３０を用いて原料焼結ロッドを
溶融凝固する方法、前述の円環状の電気炉２０を用いる
場合と同様にして行うことができる。なお、図６にＹ−
Ｂａ−Ｃｕ−Ｏ系超電導体の結晶の格子面を説明するた
めの図を示す。このようなＹ−Ｂａ−Ｃｕ−Ｏ系超電導
体の結晶においては、（１１０）面であるａｂ面に電流
が流れ易く、（１１３）面などの他の面には電流が流れ
にくくなっている。[0004] As another example of a conventional melt-solidification apparatus, a reverberatory furnace 30 as shown in FIG. 5 has been used. The reverberatory furnace 30 includes two reflecting mirrors 31,
1a and 31a are arranged so as to face each other, and the longitudinal cross-sectional shape is substantially elliptical. At the center, a hole 33 for passing the manufactured raw material sintered rod 21 is provided. An infrared lamp 35 is provided at each elliptical focal point of the raw material sintered rod 21 passed through the hole 33.
Can be partially heated and melted. The method of melting and solidifying the raw material sintering rod using such a reverberatory furnace 30 can be performed in the same manner as in the case of using the above-described annular electric furnace 20. Note that FIG.
FIG. 2 is a diagram illustrating a lattice plane of a crystal of a Ba—Cu—O-based superconductor. In such a crystal of the Y—Ba—Cu—O-based superconductor, current easily flows on the ab plane, which is the (110) plane, and current hardly flows on other planes such as the (113) plane. .
【０００５】[0005]
【発明が解決しようとする課題】ところで酸化物超電導
導体を溶融凝固法により製造する従来の酸化物超電導導
体の製造方法においては、Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導
体の結晶を１〜３ｍｍ／ｈ以下の遅い成長速度で凝固部
に成長させる必要があり、例えば、Ｙ−Ｂａ−Ｃｕ−Ｏ
系超電導体の結晶を１ｍｍ／ｈの成長速度で成長させる
場合、長さ２０ｃｍのＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体
を得るには２００時間もの長時間が必要となり、製造効
率が悪いという欠点があった。また、従来の酸化物超電
導導体の製造方法においては、得られるＹ−Ｂａ−Ｃｕ
−Ｏ系超電導導体の横断面にＹ−Ｂａ−Ｃｕ−Ｏ系超電
導体の結晶の（１１３）面が配向し、図７の模式図に示
すように（１１０）面であるａｂ面が超電導導体３８の
軸２６方向と平行となっておらず、得られるＹ−Ｂａ−
Ｃｕ−Ｏ系超電導導体３８の電流密度が低いという欠点
があった。得られる超電導導体３８の電流密度を高くす
るには、ａｂ面を超電導導体３８の軸２６方向と平行と
なるように配向させればよいが、溶融凝固法により超電
導導体を製造する場合において、ａｂ面を超電導導体の
軸方向と平行となるように配向させることができる製造
方法は未だ実現されていなかった。By the way, in a conventional method for manufacturing an oxide superconducting conductor in which an oxide superconducting conductor is manufactured by a melt-solidification method, a crystal of a Y-Ba-Cu-O-based superconductor is made to have a thickness of 1 to 3 mm / mm. h, it is necessary to grow the solidified portion at a slow growth rate of, for example, Y—Ba—Cu—O
When a crystal of a superconductor is grown at a growth rate of 1 mm / h, it takes as long as 200 hours to obtain a Y-Ba-Cu-O-based superconductor having a length of 20 cm, resulting in poor manufacturing efficiency. was there. Further, in the conventional method for manufacturing an oxide superconducting conductor, the obtained Y-Ba-Cu
The (113) plane of the crystal of the Y-Ba-Cu-O-based superconductor is oriented in the cross section of the -O-based superconductor, and the ab plane which is the (110) plane is the superconductor as shown in the schematic diagram of FIG. 38 is not parallel to the direction of the axis 26, and the obtained Y-Ba-
There is a disadvantage that the current density of the Cu-O-based superconducting conductor 38 is low. In order to increase the current density of the obtained superconducting conductor 38, the ab plane may be oriented so as to be parallel to the direction of the axis 26 of the superconducting conductor 38. A manufacturing method capable of orienting the plane so as to be parallel to the axial direction of the superconducting conductor has not yet been realized.
【０００６】本発明は、上記事情に鑑みてなされたもの
で、製造効率を向上させることができ、しかも高電流密
度の酸化物超電導導体を得ることができる酸化物超電導
導体の製造方法と、この製造方法の実施に好適に用いる
ことができる溶融凝固装置を提供することにある。The present invention has been made in view of the above circumstances, and provides a method of manufacturing an oxide superconducting conductor capable of improving manufacturing efficiency and obtaining a high current density oxide superconducting conductor. An object of the present invention is to provide a melt-solidification apparatus that can be suitably used for implementing a manufacturing method.
【０００７】[0007]
【課題を解決するための手段】請求項１記載の発明は、
酸化物超電導材料粉末を主成分とする原料粉末を成形
後、焼結して原料焼結ロッドを形成し、該原料焼結ロッ
ドを溶融凝固法により溶融凝固して超電導部を形成する
酸化物超電導導体の製造方法において、前記原料焼結ロ
ッドに形成する超電導部の長さ以上の高さを有する加熱
部を備えた加熱手段を用いて前記原料焼結ロッドをその
側面側から加熱して溶融した後、該原料焼結ロッドをこ
れの長さ方向に沿った軸方向およびこの軸方向に直交す
る直交方向に移動させながら凝固することを特徴とする
酸化物超電導導体の製造方法を前記課題の解決手段とし
た。According to the first aspect of the present invention,
After forming a raw material powder mainly composed of an oxide superconducting material powder, sintering is performed to form a raw material sintered rod, and the raw material sintered rod is melt-solidified by a melt-solidification method to form a superconductive portion. In the method for producing a conductor, the raw material sintered rod was heated and melted from a side surface thereof using a heating unit having a heating unit having a height equal to or longer than the length of the superconducting portion formed on the raw material sintered rod. A method for producing an oxide superconducting conductor, characterized in that the raw material sintered rod is solidified while being moved in the axial direction along the length direction thereof and in the orthogonal direction perpendicular to the axial direction. Means.
【０００８】また、請求項２記載の発明は、原料焼結ロ
ッドを移動させながら凝固させる際、原料焼結ロッドの
移動方向が軸方向に対して３５゜となるように原料焼結
ロッドを移動させることを特徴とする請求項１記載の酸
化物超電導導体の製造方法を前記課題の解決手段とし
た。また、請求項３記載の発明は、原料焼結ロッドを移
動させながら凝固させる際、原料焼結ロッドを移動させ
る軸方向と直交方向の移動速度比を変化させることを特
徴とする請求項１記載の酸化物超電導導体の製造方法を
前記課題の解決手段とした。According to the second aspect of the invention, when the raw material sintered rod is solidified while being moved, the raw material sintered rod is moved so that the moving direction of the raw material sintered rod is 35 ° with respect to the axial direction. A method for manufacturing an oxide superconducting conductor according to claim 1 is characterized in that the above-mentioned problem is solved. According to a third aspect of the present invention, when the raw material sintered rod is solidified while moving, the moving speed ratio in the axial direction and the direction perpendicular to the direction in which the raw material sintered rod is moved is changed. The method for producing an oxide superconducting conductor according to the above is a means for solving the above problem.
【０００９】請求項４記載の発明は、酸化物超電導材料
粉末を主成分とする原料粉末を成形、焼結してなる原料
焼結ロッドを溶融凝固して超電導部を形成する溶融凝固
装置であって、前記原料焼結ロッドに形成する超電導部
の長さ以上の高さを有する炉本体と、前記原料焼結ロッ
ドを保持するとともに該原料焼結ロッドをこの長さ方向
に沿った軸方向およびこの軸方向に直交する直交方向に
移動させるための移動機構とが少なくとも備えられ、前
記炉本体の側面には原料焼結ロッドを通すための凹状溝
が高さ方向に沿って形成され、かつ該凹状溝の壁面に原
料焼結ロッドをその側面側から加熱して溶融するための
加熱部が高さ方向に沿って設けられ、該加熱部は前記原
料焼結ロッドに形成する超電導部の長さ以上の高さを有
するものであることを特徴とする溶融凝固装置を前記課
題の解決手段とした。According to a fourth aspect of the present invention, there is provided a melt solidification apparatus for forming a superconducting portion by melting and solidifying a raw material sintered rod obtained by molding and sintering a raw material powder mainly composed of an oxide superconducting material powder. A furnace body having a height equal to or greater than the length of the superconducting portion formed in the raw material sintered rod, and holding the raw material sintered rod while holding the raw material sintered rod in the axial direction along the length direction and At least a moving mechanism for moving in a direction perpendicular to the axial direction, a concave groove for passing a raw material sintering rod is formed on a side surface of the furnace body along a height direction, and A heating portion for heating and melting the raw material sintered rod from the side surface thereof is provided on the wall surface of the concave groove along the height direction, and the heating portion has a length of a superconducting portion formed on the raw material sintered rod. Must have a height of at least The melting and solidification apparatus characterized was the solution of the above problems.
【００１０】また、請求項５記載の発明は、炉本体の側
面に形成された凹状溝の開口部の近傍に溶融した原料焼
結ロッドを冷却するための冷却機構が炉本体の高さ方向
に沿って設けられてなることを特徴とする請求項４記載
の溶融凝固装置を前記課題の解決手段とした。According to a fifth aspect of the present invention, a cooling mechanism for cooling the molten raw material sintering rod near the opening of the concave groove formed in the side surface of the furnace body is provided in the height direction of the furnace body. A melt solidification apparatus according to claim 4 is provided along the melted solidification apparatus.
【００１１】[0011]
【発明の実施の形態】以下、本発明の酸化物超電導導体
の製造方法をＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体の製造方
法に適用した一実施形態について説明する。まず、酸化
物超電導材料粉末としてのＹＢa2Ｃu3Ｏ7-x（以下、Ｙ
１２３と略す）粉末に、Ｙ2ＢaＣuＯ5（以下、Ｙ２１１
と略す）粉末と、銀粉末または白金粉末、好ましくは銀
粉末と白金粉末の両方を添加、混合して原料粉末を用意
する。 ここでのＹ１２３粉末とＹ２１１粉末との混合
比率は、１０モル：１〜５モル程度、好ましくは１０モ
ル：３〜５モル程度、より好ましくは１０モル：４モル
程度である。Ｙ２１１粉末の添加量が５モルを越える
と、Ｙ１２３結晶の連続成長が阻害されるため好ましく
なく、Ｙ２１１粉末の添加量が１モル未満であると、高
臨界電流密度（Ｊc）をもたらす磁束ピンニング量が少
ないため好ましくない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the method for manufacturing an oxide superconductor of the present invention is applied to a method for manufacturing a Y-Ba-Cu-O-based superconductor will be described below. First, YBa 2 Cu 3 O 7-x (hereinafter referred to as Y
123) Y 2 BaCuO 5 (hereinafter, Y211)
Raw material powder is prepared by adding and mixing powder and silver powder or platinum powder, preferably both silver powder and platinum powder. The mixing ratio of the Y123 powder and the Y211 powder here is about 10 mol: 1 to 5 mol, preferably about 10 mol: about 3 to 5 mol, and more preferably about 10 mol: 4 mol. If the addition amount of Y211 powder exceeds 5 mol, continuous growth of Y123 crystals is hindered, and if the addition amount of Y211 powder is less than 1 mol, the amount of magnetic flux pinning resulting in high critical current density (Jc) is undesired. Is not preferred because the amount is small.
【００１２】前記原料粉末中に銀粉末と白金粉末のうち
一方のみしか添加されていないと、得られる溶融凝固ロ
ッドの表面が粗くなったり、あるいは原料焼結ロッドの
溶融帯の下に異常凝固物が発生し、Ｙ１２３の結晶の連
続成長が阻害され、Ｙ１２３の結晶配向性が低下してし
まう。前記原料粉末中の銀粉末の添加量は、３〜１０重
量％、好ましくは５〜１０重量％である。銀粉末の添加
量が３重量％未満であると異常凝固物が発生しやすく、
一方、銀粉末の添加量が１０重量％を越えると、凝固部
中の銀粉末の分布が不均一となり、特に、銀粉末が凝固
部の中央に集まり易く、これによって得られるＹ−Ｂａ
−Ｃｕ−Ｏ系超電導導体の電流経路が狭くなり、超電導
特性が低下するため好ましくない。If only one of the silver powder and the platinum powder is added to the raw material powder, the surface of the obtained molten and solidified rod becomes rough, or the abnormally solidified material is placed below the melting zone of the raw material sintered rod. Is generated, and the continuous growth of Y123 crystals is hindered, and the crystal orientation of Y123 decreases. The addition amount of silver powder in the raw material powder is 3 to 10% by weight, preferably 5 to 10% by weight. When the addition amount of the silver powder is less than 3% by weight, abnormal coagulated matter is easily generated,
On the other hand, if the amount of the silver powder exceeds 10% by weight, the distribution of the silver powder in the solidified portion becomes non-uniform, and in particular, the silver powder tends to gather at the center of the solidified portion, and the Y-Ba obtained thereby is obtained.
The current path of the -Cu-O-based superconducting conductor is narrowed, and the superconducting characteristics are undesirably reduced.
【００１３】前記原料粉末中の白金粉末の含有量は、
０．５〜１重量％である。白金粉末の添加量が０．５重
量％未満であると、異常凝固物が発生し易いため好まし
くない。一方、白金粉末の添加量が１重量％を越える
と、原料焼結ロッドを溶融凝固する際に液相である溶融
帯に塊状のＹ１２３の結晶が晶出し易く、凝固部に形成
されるＹ１２３の結晶の結晶配向性を低下させるため好
ましくない。The content of the platinum powder in the raw material powder is as follows:
0.5 to 1% by weight. If the amount of the platinum powder is less than 0.5% by weight, an abnormal solidified product is likely to be generated, which is not preferable. On the other hand, if the addition amount of the platinum powder exceeds 1% by weight, massive Y123 crystals are easily crystallized in the molten zone, which is a liquid phase, when the raw material sintered rod is melted and solidified, and Y123 formed in the solidified portion is easily formed. This is not preferable because it lowers the crystal orientation of the crystal.
【００１４】ついで、混合した原料粉末を常温静水圧圧
縮成形法（ＣＩＰ）などにより圧縮成形してロッド状出
発材を作製した後、該ロッド状出発材を酸素雰囲気中に
おいて９００〜９３０℃の温度で、８〜２４時間程度加
熱して焼結して、原料焼結ロッドを作製する。ついで、
原料焼結ロッドを溶融凝固法により溶融凝固させて溶融
凝固ロッドを作製するが、ここでの溶融凝固際、まず、
原料焼結ロッドに超電導部を形成する超電導形成部を溶
融し、ついでこの原料焼結ロッドをこれの長さ方向に沿
った軸方向およびこの軸方向に直交する直交方向に移動
させながら前記溶融部を凝固する。Then, the mixed raw material powder is compression-molded by a normal-temperature isostatic pressing method (CIP) or the like to produce a rod-shaped starting material, and the rod-shaped starting material is heated to 900 to 930 ° C. in an oxygen atmosphere. Then, the material is heated and sintered for about 8 to 24 hours to produce a raw material sintered rod. Then
The raw material sintered rod is melt-solidified by the melt-solidification method to produce a melt-solidified rod.
The superconducting forming part for forming the superconducting portion on the raw material sintered rod is melted, and then the raw material sintered rod is moved in the axial direction along the longitudinal direction thereof and in the orthogonal direction perpendicular to the axial direction while the melting portion is formed. Solidifies.
【００１５】図１〜図２は、ここでの溶融凝固法に好適
に用いられる溶融凝固装置の一例を説明するための図で
ある。この溶融凝固装置４０は、炉本体（加熱手段）４
３と、移動機構（図示略）と、冷却機構４５から概略構
成されている。炉本体４３は、略角柱状のものであり、
その横断面の形状は図２（Ｂ）に示すようにコ字状のも
のである。この炉本体４３の高さＨは、前述のようにし
て作製した原料焼結ロッド５１に形成する超電導部５１
ｂの長さ以上の高さを有している。この炉本体４３の一
側面４３ａには、原料焼結ロッド５１を通すための凹状
溝４３ｂが高さ方向に沿って形成されており、従って、
凹状溝４３ｂの開口部４４は前記側面４３ａを高さ方向
に沿って縦断するように形成されている。開口部４４の
幅Ｗは、原料焼結ロッド５１を直交方向Ｙに移動させて
後述する冷却機構４５，４５間に配置するためと、溶融
凝固装置４０の外部に導出するために原料焼結ロッド５
１の直径より大きくなっている。FIGS. 1 and 2 are views for explaining an example of a melt-solidification apparatus suitably used in the melt-solidification method. The melting and solidifying apparatus 40 includes a furnace body (heating means) 4
3, a moving mechanism (not shown), and a cooling mechanism 45. The furnace main body 43 has a substantially prismatic shape,
The cross-sectional shape is a U-shape as shown in FIG. 2 (B). The height H of the furnace main body 43 depends on the superconducting portion 51 formed on the raw material sintered rod 51 manufactured as described above.
It has a height not less than the length of b. On one side surface 43a of the furnace main body 43, a concave groove 43b for passing the raw material sintered rod 51 is formed along the height direction.
The opening 44 of the concave groove 43b is formed so as to vertically cross the side surface 43a in the height direction. The width W of the opening 44 is set so that the raw material sintering rod 51 is moved in the orthogonal direction Y so as to be disposed between the cooling mechanisms 45, which will be described later, and to be led out of the melt-solidification device 40. 5
1 is larger than the diameter.
【００１６】この凹状溝４３ｂの壁面には、原料焼結ロ
ッド５１をその側面側から加熱して溶融するための多数
のヒータ４７からなる加熱部が高さ方向に沿って設けら
れており、この凹状溝４３ｂに原料焼結ロッド５１を入
れたとき、この原料焼結ロッド５１の側面周囲の四方向
のうち三方向がヒータ４７によって取り囲まれるように
なっている。この多数のヒータ４７からなる加熱部は、
前述のようにして作製した原料焼結ロッド５１に形成す
る超電導部５１ｂの長さ以上の高さを有している。凹状
溝４３ｂ内の温度は、原料焼結ロッド５１の融点より高
い温度、例えば原料焼結ロッド５１の融点が９５０℃の
とき１０００〜１０５０℃となるようにヒータ４７に供
給される電圧量を変更することによって制御されてい
る。On the wall surface of the concave groove 43b, there is provided a heating portion including a number of heaters 47 for heating and melting the raw material sintered rod 51 from the side surface thereof along the height direction. When the raw material rod 51 is inserted into the concave groove 43 b, the heater 47 surrounds three of the four directions around the side surface of the raw material rod 51. The heating section composed of the large number of heaters 47
It has a height equal to or greater than the length of the superconducting portion 51b formed on the raw material sintered rod 51 manufactured as described above. The amount of voltage supplied to the heater 47 is changed so that the temperature in the concave groove 43b is higher than the melting point of the raw material sintered rod 51, for example, 1000 to 1050 ° C. when the melting point of the raw material sintered rod 51 is 950 ° C. It is controlled by
【００１７】このような炉本体４３の上方には、移動機
構が設けられている。この移動機構は、原料焼結ロッド
５１を保持するとともに該原料焼結ロッド５１をこの長
さ方向に沿った中心軸Ｇの方向（軸方向）Ｘおよびこの
軸方向Ｘに直交する直交方向Ｙに移動させるためのもの
である。また、前記炉本体４３の側面４３ａで、凹状溝
４３ｂの開口部４４の両側に、前記ヒータ４７により溶
融した原料焼結ロッド５１を冷却するための冷却機構４
５，４５が炉本体４３の高さ方向に沿って設けられてい
る。冷却機構４５の具体例としては、冷水が流された冷
水パイプを開口部４４の両側の側面４３ａに高さ方向に
って配設したものなどが挙げられる。A moving mechanism is provided above the furnace main body 43. The moving mechanism holds the raw material sintered rod 51 and moves the raw material sintered rod 51 in a direction (axial direction) X of a central axis G along the length direction and an orthogonal direction Y orthogonal to the axial direction X. It is for moving. A cooling mechanism 4 for cooling the raw material sintering rod 51 melted by the heater 47 is provided on both sides of the opening 44 of the concave groove 43b on the side surface 43a of the furnace body 43.
5 and 45 are provided along the height direction of the furnace main body 43. As a specific example of the cooling mechanism 45, a cooling water pipe through which cold water flows is disposed on the side surfaces 43a on both sides of the opening 44 in the height direction.
【００１８】このような構成の溶融凝固凝固装置４０を
用いて原料焼結ロッド５１を溶融凝固させるには、ヒー
タ４７の電源をいれて凹状溝４３ｂ内の温度が原料焼結
ロッド５１の融点より高い温度となるように設定し、つ
いで原料焼結ロッド５１の上部の保持部５１ａを前記移
動機構により保持し、この原料焼結ロッド５１の保持部
５１ａ以外の超電導形成部５１ｂを炉本体４３の凹状溝
４３ｂ内に導入する。ついで、原料焼結ロッド５１を中
心軸Ｇを中心にして回転させながら超電導形成部５１ｂ
をその側面側から加熱して溶融する。このとき原料焼結
ロッド５１の溶融した超電導形成部は半溶融状態であれ
ば、原料焼結ロッド５１の自重で切れてしまわない程度
の軸方向Ｘの張力を有している。In order to melt-solidify the raw material sintered rod 51 using the melt-solidification solidifying apparatus 40 having such a configuration, the power in the heater 47 is turned on, and the temperature in the concave groove 43b is made higher than the melting point of the raw material sintered rod 51. The temperature is set to be high, and then the holding portion 51a on the upper part of the raw material sintered rod 51 is held by the moving mechanism, and the superconducting forming part 51b other than the holding part 51a of the raw material sintered rod 51 is It is introduced into the concave groove 43b. Next, while rotating the raw material sintered rod 51 about the central axis G, the superconducting forming portion 51b is rotated.
Is heated from its side to melt. At this time, if the molten superconducting forming portion of the raw material sintered rod 51 is in a semi-molten state, it has a tension in the axial direction X that does not cause the raw material sintered rod 51 to be cut by its own weight.
【００１９】ついで、原料焼結ロッド５１を軸方向Ｘお
よび直交方向Ｙに移動させて開口部から冷却機構４５，
４５間に配置し、これら冷却機構４５，４５によって溶
融部を冷却して凝固させると、凝固部にＹ１２３の結晶
が形成される。ここでの原料焼結ロッド５１の移動距離
は、このロッド５１の直径程度の短い距離である。ま
た、ここでの凝固部のＹ１２３の結晶の成長速度は、原
料焼結ロッド５１の移動速度により制限され、１〜３ｍ
ｍ／程度とされる。ついで、溶融凝固ロッドを酸素雰囲
気中において４５０〜５００℃の温度で、４８〜１５０
時間程度アニールする。この後、溶融凝固ロッドを常温
まで冷却すると、目的とするＹ−Ｂａ−Ｃｕ−Ｏ系超電
導導体が得られる。Next, the raw material sintered rod 51 is moved in the axial direction X and the orthogonal direction Y so that the cooling mechanism 45,
When the molten portion is cooled and solidified by the cooling mechanisms 45, 45, a Y123 crystal is formed in the solidified portion. Here, the moving distance of the raw material sintered rod 51 is a short distance about the diameter of the rod 51. In addition, the growth rate of the Y123 crystal in the solidified portion here is limited by the moving speed of the raw material sintered rod 51, and is 1 to 3 m.
m / approximately. Next, the melt-solidified rod is placed in an oxygen atmosphere at a temperature of 450 to 500 ° C. for 48 to 150 ° C.
Anneal for about an hour. Thereafter, when the melt-solidified rod is cooled to room temperature, the intended Y-Ba-Cu-O-based superconductor is obtained.
【００２０】また、前記原料焼結ロッド５１を移動させ
ながら凝固する際、移動速度が１ｍｍ／ｈの場合、原料
焼結ロッド５１の移動方向Ｚが軸方向Ｘに対して３５゜
となるようにすなわち移動方向Ｚと軸方向Ｘとの間に作
られる角θが３５゜になるようにすることが好ましい。
このように原料焼結ロッド５１の移動方向Ｚが軸方向Ｘ
に対して３５゜になるようにすると、原料焼結ロッド５
１の移動方向ＺとＹ−Ｂａ−Ｃｕ−Ｏ系超電導体の結晶
の（１１３）面の法線が一致し、その結果として図３の
模式図に示すように得られるＹ−Ｂａ−Ｃｕ−Ｏ系超電
導導体５８の軸方向Ｘと平行にＹ−Ｂａ−Ｃｕ−Ｏ系超
電導体の結晶５９の（１１０）面が配向し、すなわちａ
ｂ面が超電導導体５８の軸方向Ｘと平行となるので、高
電流密度特性を備えたＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体
を得ることができる。When the raw material sintered rod 51 is solidified while moving, when the moving speed is 1 mm / h, the moving direction Z of the raw material sintered rod 51 is set to 35 ° with respect to the axial direction X. That is, it is preferable that the angle θ formed between the movement direction Z and the axial direction X is 35 °.
As described above, the moving direction Z of the raw material sintered rod 51 is in the axial direction X.
Is 35 ° with respect to the raw material sintered rod 5.
The normal direction of the (113) plane of the crystal of the Y-Ba-Cu-O-based superconductor coincides with the moving direction Z of 1 and, as a result, the Y-Ba-Cu- obtained as shown in the schematic diagram of FIG. The (110) plane of the crystal 59 of the Y-Ba-Cu-O-based superconductor is oriented parallel to the axial direction X of the O-based superconductor 58, ie, a
Since the plane b is parallel to the axial direction X of the superconducting conductor 58, a Y-Ba-Cu-O-based superconducting conductor having high current density characteristics can be obtained.
【００２１】また、Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導導体は
超電導体の異方性結晶を有し、結晶軸の方向が重要なパ
ラメータになるが、原料焼結ロッド５１を移動させなが
ら凝固する際、原料焼結ロッド５１を移動させる軸方向
と直交方向の移動速度比を変化させることにより、超電
導体の異方性結晶の結晶軸の方向を制御することがで
き、これによって超電導導体の電流密度特性を変更する
ことができ、所望の電流密度特性を備えたＹ−Ｂａ−Ｃ
ｕ−Ｏ系超電導導体を得ることができる。前述のように
して製造されたＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体は、極
低温の冷媒中に浸漬された超電導機器に給電するための
超電導電流リード線などに好適に用いることができる。The Y—Ba—Cu—O-based superconductor has an anisotropic crystal of the superconductor, and the direction of the crystal axis is an important parameter, but solidifies while moving the raw material sintered rod 51. At this time, the direction of the crystal axis of the anisotropic crystal of the superconductor can be controlled by changing the moving speed ratio between the axial direction in which the raw material sintered rod 51 is moved and the direction orthogonal to the direction in which the superconducting conductor is moved. Y-Ba-C having a desired current density characteristic whose density characteristic can be changed
A uO-based superconducting conductor can be obtained. The Y-Ba-Cu-O-based superconducting conductor manufactured as described above can be suitably used for a superconducting current lead wire for supplying power to a superconducting device immersed in a cryogenic refrigerant.
【００２２】この実施形態のＹ−Ｂａ−Ｃｕ−Ｏ系超電
導導体の製造方法にあっては、酸化物超電導材料粉末を
主成分とする原料粉末を成形後、焼結して原料焼結ロッ
ド５１を形成し、該原料焼結ロッド５１を溶融凝固法に
より溶融凝固して超電導部５１ｂを形成する酸化物超電
導導体の製造方法において、前記原料焼結ロッド５１に
形成する超電導部５１ｂの長さ以上の高さを有する加熱
部を備えた炉本体（加熱手段）４３を用いて前記原料焼
結ロッド５１の略全体（少なくとも超電導形成部５１
ｂ）をその側面側から加熱して溶融した後、該原料焼結
ロッド５１を軸方向Ｘおよび直交方向Ｙに移動させなが
ら凝固することにより、溶融した原料焼結ロッド５１を
これの直径程度の僅かな距離を移動させるだけで原料焼
結ロッド５１の略全長（少なくとも超電導形成部５１
ｂ）に亘って凝固させることができるので、原料焼結ロ
ッド５１を短時間で溶融凝固させることができ、従って
Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導導体の製造効率が向上す
る。また、溶融凝固装置４０にあっては、前述の構成と
したことにより、前述の実施形態のＹ−Ｂａ−Ｃｕ−Ｏ
系超電導導体の製造方法において原料焼結ロッド５１を
溶融凝固させて超電導部５１ｂを形成するときに好適に
用いることができる。In the method of manufacturing a Y—Ba—Cu—O-based superconducting conductor according to this embodiment, a raw material powder mainly composed of an oxide superconducting material powder is molded and then sintered to form a raw material sintered rod 51. And forming the superconducting portion 51b by melt-solidifying the raw material sintered rod 51 by a melt-solidification method, wherein the length of the superconducting portion 51b formed on the raw material sintered rod 51 is equal to or greater than the length of the superconducting portion 51b. Of the raw material sintered rod 51 (at least the superconducting forming part 51) using a furnace body (heating means) 43 having a heating part having a height of
b) is heated and melted from the side surface thereof, and then solidified while moving the raw material sintered rod 51 in the axial direction X and the orthogonal direction Y. Just by moving a small distance, the entire length of the raw material sintered rod 51 (at least the superconducting formation portion 51
Since the solidification can be performed over b), the raw material sintered rod 51 can be melted and solidified in a short time, and thus the production efficiency of the Y—Ba—Cu—O-based superconductor is improved. Further, in the melt-solidification device 40, by adopting the above-described configuration, the Y-Ba-Cu-O of the above-described embodiment is used.
It can be suitably used when the raw material sintered rod 51 is melted and solidified to form the superconducting portion 51b in the method for producing a superconducting conductor.
【００２３】なお、前述の酸化物超電導導体の製造方法
の例においては、Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導導体を製
造する場合について説明したが、Ａ−Ｂ−Ｃｕ−Ｏ系
（ただし、ＡはＬa，Ｃe，Ｙ，Ｓc，Ｙbなどの周期律表
IIIa族元素の１種以上を示し、ＢはＳr，Ｂaなどの周期
律表IIa族元素の１種以上を示す）系超電導導体を製造
する場合にも同様になし得る。In the above-described example of the method of manufacturing an oxide superconductor, the case of manufacturing a Y-Ba-Cu-O-based superconductor has been described. Is the periodic table of La, Ce, Y, Sc, Yb, etc.
The same applies to the case of producing a group IIIa element, and B represents one or more group IIa elements of the periodic table such as Sr and Ba.
【００２４】[0024]
（実施例）ＹＢa2Ｃu3Ｏ7-x（Ｙ１２３）粉末とＹ2Ｂa
ＣuＯ5（Ｙ２１１）粉末と比率が１０モル：３モルの粉
末に、Ａg粉末３〜１０重量％と、Ｐt粉末０．５〜１重
量％とを混合した原料粉末を用意した。ついで、混合し
た原料粉末を常温静水圧圧縮成形法により成形圧力２０
００ｋｇ／ｃｍ2で圧縮成形し、ロッド状出発材を作製
した。これらのロッド状出発材を、酸素雰囲気中で９０
０℃、８時間で焼結し原料焼結ロッドを作製した。つい
で、図１と同様の溶融凝固装置を用意し、ヒータの電源
をいれて凹状溝内の温度が１０３５℃となるように設定
し、ついで作製した原料焼結ロッドの上部の保持部を溶
融凝固装置の移動機構により保持した。この後、この原
料焼結ロッドの超電導形成部を炉本体の凹状溝内に導入
し、原料焼結ロッドを中心軸を中心にして回転させなが
ら超電導形成部をその側面側から加熱して溶融した。(Example) YBa 2 Cu 3 O 7-x (Y123) powder and Y 2 Ba
A raw material powder was prepared by mixing a CuO 5 (Y211) powder and a powder having a ratio of 10 mol: 3 mol with 3 to 10 wt% of an Ag powder and 0.5 to 1 wt% of a Pt powder. Next, the mixed raw material powder was molded at a molding pressure of
Compression molding was performed at 00 kg / cm 2 to produce a rod-shaped starting material. These rod-shaped starting materials were prepared in an oxygen atmosphere at 90
Sintering was performed at 0 ° C. for 8 hours to produce a raw material sintered rod. Next, a melt-solidification apparatus similar to that shown in FIG. 1 was prepared, the power of the heater was turned on, the temperature in the concave groove was set to 1035 ° C., and the upper holding portion of the manufactured raw material sintered rod was melt-solidified. It was held by the moving mechanism of the device. Thereafter, the superconducting forming portion of the raw material sintered rod was introduced into the concave groove of the furnace main body, and the superconducting forming portion was heated and melted from the side surface side while rotating the raw material sintered rod about the central axis. .
【００２５】ついで、原料焼結ロッドを軸方向および直
交方向に移動させて炉本体の開口部から冷却機構の間に
配置し、これら冷却機構によって超電導形成部を冷却し
て凝固させ、凝固部にＹ１２３の結晶を形成することに
より、 径２．５ｍｍ、長さ２００ｍｍの溶融凝固ロッ
ドを作製した。ここで原料焼結ロッドを移動させながら
凝固する際、原料焼結ロッドの直交方向への移動速度を
軸方向への移動速度と同じ速度１ｍｍ／ｈにし、原料焼
結ロッドの移動方向と軸方向との間に作られる角が３５
゜になるようにした。このときの原料焼結ロッドの移動
距離は、１０ｍｍであった。また、ここでの原料焼結ロ
ッドの溶融凝固に要した時間は、１０時間であった。つ
いで、作製した溶融凝固ロッドを酸素雰囲気中において
５００℃の温度で、４８時間程度アニールした後、冷却
した。この後、溶融凝固ロッドを常温まで冷却し、径
２．５ｍｍ、長さ２０ｃｍＹ−Ｂａ−Ｃｕ−Ｏ系超電導
導体を得た。Next, the raw material sintering rod is moved in the axial direction and the orthogonal direction and arranged between the opening of the furnace main body and the cooling mechanism. The superconducting forming part is cooled and solidified by these cooling mechanisms, and the solidified part is formed. By forming crystals of Y123, a melt-solidified rod having a diameter of 2.5 mm and a length of 200 mm was produced. Here, when the raw material sintered rod is solidified while moving, the moving speed in the orthogonal direction of the raw material sintered rod is set to 1 mm / h, which is the same as the moving speed in the axial direction. The angle made between is 35
゜. At this time, the moving distance of the raw material sintered rod was 10 mm. In addition, the time required for melting and solidifying the raw material sintered rod was 10 hours. Next, the produced melt-solidified rod was annealed in an oxygen atmosphere at a temperature of 500 ° C. for about 48 hours, and then cooled. Thereafter, the melt-solidified rod was cooled to room temperature to obtain a Y-Ba-Cu-O-based superconductor having a diameter of 2.5 mm and a length of 20 cm.
【００２６】次に、この実施例で得られたＹ−Ｂａ−Ｃ
ｕ−Ｏ系超電導導体の電流密度（臨界電流密度）特性に
ついて調べた。ここでの電流密度特性は、直流四端子法
により７７Ｋ、０テスラにおける臨界電流（Ｉc）と臨
界電流密度（Ｊc）を測定することにより調べた。その
結果、実施例で得られたＹ−Ｂａ−Ｃｕ−Ｏ系超電導導
体は、Ｉcが１５００（Ａ）、Ｊcが３．０（１０4Ａ／
ｃｍ2）であり、後述する比較例で得られたＹ−Ｂａ−
Ｃｕ−Ｏ系超電導導体に比べてＩcおよびＪcが大きく、
電流密度特性が高いことが分った。Next, the Y-Ba-C obtained in this Example
The current density (critical current density) characteristics of the uO-based superconducting conductor were examined. The current density characteristics here were examined by measuring the critical current (Ic) and the critical current density (Jc) at 77 K and 0 Tesla by the DC four-terminal method. As a result, in the Y—Ba—Cu—O-based superconductor obtained in the example, Ic was 1500 (A) and Jc was 3.0 (10 4 A /
cm 2 ), and Y-Ba- obtained in a comparative example described later.
Ic and Jc are larger than Cu-O based superconducting conductor,
It was found that the current density characteristics were high.
【００２７】（比較例）図４と同様の円環状の電気炉を
用意し、この電気炉内の温度が１０３５℃になるように
セットし、前記実施例と同様にして作製した原料焼結ロ
ッドの上端部側から前記電気炉内に導入し、該原料焼結
ロッドの長さ方向に沿った軸を中心にして回転させなが
ら徐々に上方（長さ方向の軸の方向に沿った方向）に引
き上げることにより、原料焼結ロッドに部分的に形成さ
れた溶融帯を上端部側から下端部側に徐々に移動させる
とともに電気炉から導出された部分を冷やして凝固させ
て、溶融を経て凝固した凝固部にＹ−Ｂａ−Ｃｕ−Ｏ系
超電導体の結晶を成長させ、径２．５ｍｍ、長さ２００
ｍｍの溶融凝固ロッドを作製した。ここでのＹＢa2Ｃu3
Ｏ7-x（Ｙ１２３）の結晶の成長速度は１ｍｍ／ｈであ
った。また、ここでの原料焼結ロッドの溶融凝固に要し
た時間は、２００時間であった。ついで、作製した溶融
凝固ロッドを酸素雰囲気中において５００℃の温度で、
４８時間程度アニールした後、冷却した。この後、溶融
凝固ロッドを常温まで冷却し、径２．５ｍｍ、長さ２０
ｃｍＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体を得た。(Comparative Example) An annular electric furnace similar to that shown in FIG. 4 was prepared, and the temperature in the electric furnace was set to 1035 ° C., and the raw material sintered rod produced in the same manner as in the above-described embodiment. Of the raw material sintering rod is introduced into the electric furnace from the upper end side and gradually rotated upward (in the direction along the longitudinal axis) while rotating about the axis along the longitudinal direction of the raw material sintered rod. By raising, the molten zone formed partially on the raw material sintered rod was gradually moved from the upper end side to the lower end side, and the part derived from the electric furnace was cooled and solidified, and solidified through melting A crystal of a Y—Ba—Cu—O-based superconductor is grown on the solidified portion, and has a diameter of 2.5 mm and a length of 200 mm.
mm was prepared. YBa 2 Cu 3 here
The growth rate of O 7-x (Y123) crystal was 1 mm / h. In addition, the time required for melting and solidifying the raw material sintered rod was 200 hours. Next, the produced melt-solidified rod was placed in an oxygen atmosphere at a temperature of 500 ° C.
After annealing for about 48 hours, it was cooled. Thereafter, the molten solidified rod is cooled to room temperature, and has a diameter of 2.5 mm and a length of 20 mm.
A cmY-Ba-Cu-O-based superconductor was obtained.
【００２８】次に、この比較例で得られたＹ−Ｂａ−Ｃ
ｕ−Ｏ系超電導導体の電流密度（臨界電流密度）特性に
ついて調べた。ここでの電流密度特性は、直流四端子法
により７７Ｋ、０テスラにおける臨界電流（Ｉc）と臨
界電流密度（Ｊc）を測定することにより調べた。その
結果、Ｉcが１０００（Ａ）、Ｊcが２．０（１０4Ａ／
ｃｍ2）であった。Next, the Y-Ba-C obtained in this comparative example was
The current density (critical current density) characteristics of the uO-based superconducting conductor were examined. The current density characteristics here were examined by measuring the critical current (Ic) and the critical current density (Jc) at 77 K and 0 Tesla by the DC four-terminal method. As a result, Ic was 1000 (A) and Jc was 2.0 (10 4 A /
cm 2 ).
【００２９】[0029]
【発明の効果】以上説明したように本発明の酸化物超電
導導体の製造方法にあっては、特に、原料焼結ロッドに
形成する超電導部の長さ以上の高さを有する加熱部を備
えた加熱手段を用いて原料焼結ロッドをその側面側から
加熱して溶融した後、該原料焼結ロッドをこれの長さ方
向に沿った軸方向およびこの軸方向に直交する直交方向
に移動させながら凝固することにより、溶融した原料焼
結ロッドをこれの直径程度の僅かな距離を移動させるだ
けで原料焼結ロッドの略全長（少なくとも超電導形成
部）に亘って凝固させることができるので、原料焼結ロ
ッドを短時間で溶融凝固させることができ、従って酸化
物超電導導体の製造効率を向上させることができるとい
う利点がある。また、原料焼結ロッドを移動させながら
凝固する際、原料焼結ロッドを移動させる軸方向と直交
方向の移動速度比を変化させることにより、原料焼結ロ
ッドの移動方向と酸化物超電導体の結晶の（１１３）面
の法線が一致し、その結果として得られるＹ−Ｂａ−Ｃ
ｕ−Ｏ系超電導導体の軸方向と平行に酸化物超電導体の
結晶の（１１０）面が配向し、すなわちａｂ面が酸化物
超電導導体の軸方向と平行となるので、高電流密度特性
を備えた酸化物超電導導体を得ることができるという利
点がある。As described above, in the method for manufacturing an oxide superconducting conductor of the present invention, a heating section having a height not less than the length of the superconducting section formed on the raw material sintered rod is particularly provided. After heating and melting the raw material sintered rod from its side using a heating means, while moving the raw material sintered rod in the axial direction along its length direction and in the orthogonal direction perpendicular to this axial direction. By solidifying, the molten raw material sintered rod can be solidified over substantially the entire length (at least the superconducting forming portion) of the raw material sintered rod by moving only a small distance about its diameter. There is an advantage that the connecting rod can be melted and solidified in a short time, and therefore, the production efficiency of the oxide superconductor can be improved. In addition, when solidifying while moving the raw material sintered rod, the moving direction ratio of the raw material sintered rod and the crystal of the oxide superconductor are changed by changing the moving speed ratio in the direction perpendicular to the axial direction in which the raw material sintered rod is moved. Of the (113) plane coincide with each other, and the resulting Y-Ba-C
Since the (110) plane of the crystal of the oxide superconductor is oriented in parallel to the axial direction of the uO-based superconductor, that is, the ab plane is parallel to the axial direction of the oxide superconductor, high current density characteristics are provided. There is an advantage that an oxide superconducting conductor can be obtained.
【００３０】また、原料焼結ロッドを移動させながら凝
固する際、原料焼結ロッドの移動方向が軸方向に対して
３５゜となるように原料焼結ロッドを移動させることに
より、酸化物超電導体の異方性結晶の結晶軸の方向を制
御することができ、これによって酸化物超電導導体の電
流密度特性を変更することができ、所望の電流密度特性
を備えた酸化物超電導導体を得ることができるという利
点がある。Further, when the raw material sintered rod is solidified while being moved, the raw material sintered rod is moved so that the moving direction of the raw material sintered rod is 35 ° with respect to the axial direction. The direction of the crystal axis of the anisotropic crystal can be controlled, whereby the current density characteristics of the oxide superconducting conductor can be changed, and an oxide superconducting conductor having desired current density characteristics can be obtained. There is an advantage that you can.
【００３１】本発明の溶融凝固装置にあっては、原料焼
結ロッドに形成する超電導部の長さ以上の高さを有する
炉本体と、原料焼結ロッドを保持するとともに該原料焼
結ロッドをこの長さ方向に沿った軸方向およびこの軸方
向に直交する直交方向に移動させるための移動機構とが
少なくとも備えられ、前記炉本体の側面には原料焼結ロ
ッドを通すための凹状溝が高さ方向に沿って形成され、
かつ該凹状溝の壁面に原料焼結ロッドをその側面側から
加熱して溶融するための加熱部が高さ方向に沿って設け
られ、該加熱部は前記原料焼結ロッドに形成する超電導
部の長さ以上の高さを有するものであるので、前述の本
発明の酸化物超電導導体の製造方法において原料焼結ロ
ッドを溶融凝固して超電導部を形成するときに好適に用
いることができる。In the melt-solidification apparatus of the present invention, a furnace body having a height equal to or longer than the length of the superconducting portion formed on the raw material sintered rod, the raw material sintered rod, and the raw material sintered rod are held. At least a moving mechanism for moving in the axial direction along the length direction and in a perpendicular direction orthogonal to the axial direction is provided, and a concave groove for passing a raw material sintering rod is provided on a side surface of the furnace body. Formed along the direction
A heating portion for heating and melting the raw material sintered rod from the side surface thereof is provided along a height direction on a wall surface of the concave groove, and the heating portion is provided with a superconducting portion formed on the raw material sintered rod. Since it has a height equal to or greater than the length, it can be suitably used when the raw material sintered rod is melted and solidified to form a superconducting portion in the above-described method for producing an oxide superconducting conductor of the present invention.
【００３２】また、前記溶融凝固装置において、炉本体
の側面に形成された凹状溝の開口部の近傍に溶融した原
料焼結ロッドを冷却するための冷却機構が炉本体の高さ
方向に沿って設けられたものにあっては、原料焼結ロッ
ドを直交方向に移動させることによって、凹状溝の開口
部から炉本体の外側に原料焼結ロッドを導出すると同時
に冷却機構の間に配置して、超電導形成部を冷却して凝
固させることができる。In the above-mentioned melt solidification apparatus, a cooling mechanism for cooling the raw material sintering rod melted in the vicinity of the opening of the concave groove formed on the side surface of the furnace main body is provided along the height direction of the furnace main body. In the provided one, by moving the raw material sintering rod in the orthogonal direction, the raw material sintering rod is led out of the furnace body from the opening of the concave groove, and at the same time placed between the cooling mechanisms, The superconducting formation can be cooled and solidified.
【図１】 本発明の酸化物超電導導体の製造方法におい
て、原料焼結ロッドを溶融凝固する際に用いる溶融凝固
装置の一例を説明するための概略構成図である。FIG. 1 is a schematic configuration diagram illustrating an example of a melt-solidification apparatus used when melt-solidifying a raw material sintered rod in a method of manufacturing an oxide superconductor according to the present invention.
【図２】 （Ａ）図１の溶融凝固装置のＩ−Ｉ線に沿っ
た縦断面図、（Ｂ）図１の溶融凝固装置のII−II線に沿
った横断面図である。2A is a longitudinal sectional view taken along line II of the melt solidification apparatus of FIG. 1, and FIG. 2B is a cross sectional view taken along line II-II of the melt solidification apparatus of FIG.
【図３】 本発明の酸化物超電導導体の製造方法により
製造されたＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体と、これを
構成するＹ−Ｂａ−Ｃｕ−Ｏ系超電導体の結晶の配向状
態を説明するための模式図である。FIG. 3 shows a Y—Ba—Cu—O-based superconductor produced by the method for producing an oxide superconductor of the present invention and a crystal orientation state of the Y—Ba—Cu—O-based superconductor constituting the superconductor. It is a schematic diagram for description.
【図４】 従来の溶融凝固装置の例を説明するための概
略構成図である。FIG. 4 is a schematic configuration diagram for explaining an example of a conventional melt-solidification apparatus.
【図５】 従来の溶融凝固装置のその他の例を説明する
ための概略構成図である。FIG. 5 is a schematic configuration diagram for explaining another example of a conventional melt-solidification apparatus.
【図６】 Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導体の結晶の格子
面を説明するための図である。FIG. 6 is a diagram illustrating a lattice plane of a crystal of a Y—Ba—Cu—O-based superconductor.
【図７】 従来の酸化物超電導導体の製造方法により製
造されたＹ−Ｂａ−Ｃｕ−Ｏ系超電導導体と、これを構
成するＹ−Ｂａ−Ｃｕ−Ｏ系超電導体の結晶の配向状態
を説明するための模式図である。FIG. 7 illustrates a Y—Ba—Cu—O-based superconductor produced by a conventional method for producing an oxide superconductor and the orientation state of crystals of the Y—Ba—Cu—O-based superconductor constituting the superconductor. FIG.
４０・・・溶融凝固装置、４３・・・炉本体（加熱手段）、４
３ａ・・・側面、４３ｂ・・・凹状溝、 ４４・・・開口部、４
５・・・冷却機構、４７・・・ヒータ、５１・・・原料焼結ロッ
ド、５１ａ・・・保持部、５１ｂ・・・超電導部（超電導形成
部）、５８・・・超電導導体、５９・・・超電導体の結晶、Ｈ
・・・高さ、Ｇ・・・中心軸、Ｘ・・・軸方向、Ｙ・・・直交方向、
Ｚ・・・移動方向、θ・・・角度。40: melting and solidifying device, 43: furnace body (heating means), 4
3a: side surface, 43b: concave groove, 44: opening, 4
Reference numeral 5: cooling mechanism, 47: heater, 51: raw material sintered rod, 51a: holding portion, 51b: superconducting portion (superconducting forming portion), 58: superconducting conductor, 59 ..Superconductor crystal, H
... Height, G ... Center axis, X ... Axial direction, Y ... Orthogonal direction,
Z: moving direction, θ: angle.
Claims (5)
料粉末を成形後、焼結して原料焼結ロッドを形成し、該
原料焼結ロッドを溶融凝固法により溶融凝固して超電導
部を形成する酸化物超電導導体の製造方法において、 前記原料焼結ロッドに形成する超電導部の長さ以上の高
さを有する加熱部を備えた加熱手段を用いて前記原料焼
結ロッドをその側面側から加熱して溶融した後、該原料
焼結ロッドをこれの長さ方向に沿った軸方向およびこの
軸方向に直交する直交方向に移動させながら凝固するこ
とを特徴とする酸化物超電導導体の製造方法。A raw material powder mainly composed of an oxide superconducting material powder is molded and sintered to form a raw material sintered rod, and the raw material sintered rod is melt-solidified by a melt solidification method to form a superconducting portion. In the method for producing an oxide superconducting conductor to be formed, the raw material sintered rod is heated from the side by using a heating means having a heating part having a height equal to or longer than the length of the superconducting part to be formed on the raw material sintered rod. After heating and melting, the raw material sintered rod is solidified while moving in the axial direction along the longitudinal direction thereof and in the orthogonal direction perpendicular to the axial direction. .
せる際、原料焼結ロッドの移動方向が軸方向に対して３
５゜となるように原料焼結ロッドを移動させることを特
徴とする請求項１記載の酸化物超電導導体の製造方法。2. When the raw material sintering rod is solidified while moving, the moving direction of the raw material sintering rod is 3 degrees with respect to the axial direction.
2. The method for producing an oxide superconductor according to claim 1, wherein the raw material sintered rod is moved so as to be 5 [deg.].
せる際、原料焼結ロッドを移動させる軸方向と直交方向
の移動速度比を変化させることを特徴とする請求項１記
載の酸化物超電導導体の製造方法。3. The oxide superconducting conductor according to claim 1, wherein, when the raw material sintered rod is solidified while moving, the moving speed ratio in the axial direction and the direction perpendicular to the direction in which the raw material sintered rod is moved is changed. Manufacturing method.
原料粉末を成形、焼結してなる原料焼結ロッドを溶融凝
固して超電導部を形成する溶融凝固装置であって、 前記原料焼結ロッドに形成する超電導部の長さ以上の高
さを有する炉本体と、前記原料焼結ロッドを保持すると
ともに該原料焼結ロッドをこの長さ方向に沿った軸方向
およびこの軸方向に直交する直交方向に移動させるため
の移動機構とが少なくとも備えられ、前記炉本体の側面
には原料焼結ロッドを通すための凹状溝が高さ方向に沿
って形成され、かつ該凹状溝の壁面に原料焼結ロッドを
その側面側から加熱して溶融するための加熱部が高さ方
向に沿って設けられ、該加熱部は前記原料焼結ロッドに
形成する超電導部の長さ以上の高さを有するものである
ことを特徴とする溶融凝固装置。4. A melt-solidification apparatus for forming a superconducting portion by melting and solidifying a raw material sintered rod obtained by molding and sintering a raw material powder mainly composed of an oxide superconducting material powder, A furnace main body having a height equal to or greater than the length of the superconducting portion formed on the rod, and holding the raw material sintered rod, and holding the raw material sintered rod in an axial direction along the length direction and orthogonal to the axial direction. At least a moving mechanism for moving in the orthogonal direction, a concave groove for passing a raw material sintering rod is formed along a height direction on a side surface of the furnace body, and a raw material is formed on a wall surface of the concave groove. A heating portion for heating and melting the sintered rod from the side surface thereof is provided along the height direction, and the heating portion has a height equal to or longer than the length of the superconducting portion formed on the raw material sintered rod. Characterized by the fact that Apparatus.
部の近傍に溶融した原料焼結ロッドを冷却するための冷
却機構が炉本体の高さ方向に沿って設けられてなること
を特徴とする請求項４記載の溶融凝固装置。5. A cooling mechanism for cooling a molten raw material sintering rod in the vicinity of an opening of a concave groove formed on a side surface of a furnace main body is provided along a height direction of the furnace main body. The melt-solidification apparatus according to claim 4, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21381496A JP3597319B2 (en) | 1996-08-13 | 1996-08-13 | Method for producing oxide superconducting conductor and melt solidification apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21381496A JP3597319B2 (en) | 1996-08-13 | 1996-08-13 | Method for producing oxide superconducting conductor and melt solidification apparatus |
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| Publication Number | Publication Date |
|---|---|
| JPH1064350A true JPH1064350A (en) | 1998-03-06 |
| JP3597319B2 JP3597319B2 (en) | 2004-12-08 |
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| JP2006169567A (en) * | 2004-12-14 | 2006-06-29 | Jfe Steel Kk | Electrical steel sheet with insulation coating |
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| JP2006169567A (en) * | 2004-12-14 | 2006-06-29 | Jfe Steel Kk | Electrical steel sheet with insulation coating |
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