JPH02197017A - Connecting method of compound-type superconductive wire - Google Patents
Connecting method of compound-type superconductive wireInfo
- Publication number
- JPH02197017A JPH02197017A JP1015876A JP1587689A JPH02197017A JP H02197017 A JPH02197017 A JP H02197017A JP 1015876 A JP1015876 A JP 1015876A JP 1587689 A JP1587689 A JP 1587689A JP H02197017 A JPH02197017 A JP H02197017A
- Authority
- JP
- Japan
- Prior art keywords
- compound
- filaments
- tubular
- connection
- 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
- 238000000034 method Methods 0.000 title claims description 22
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000002887 superconductor Substances 0.000 claims description 41
- 150000001875 compounds Chemical class 0.000 claims description 37
- 239000010949 copper Substances 0.000 claims description 17
- 238000009792 diffusion process Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000007790 solid phase Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 abstract description 12
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 10
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 5
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 5
- 229910052718 tin Inorganic materials 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 3
- 230000000593 degrading effect Effects 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 239000010955 niobium Substances 0.000 description 34
- 229910000657 niobium-tin Inorganic materials 0.000 description 27
- 239000012071 phase Substances 0.000 description 18
- 229910000906 Bronze Inorganic materials 0.000 description 8
- 239000010974 bronze Substances 0.000 description 7
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000002085 persistent effect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 229910020018 Nb Zr Inorganic materials 0.000 description 1
- 229910020012 Nb—Ti Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000004804 winding Methods 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
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、Ｎｂ３ ＳｎやＮｂ、ＡＩなどの化合物系超
電導体からなる超電導線の接続方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for connecting superconducting wires made of compound-based superconductors such as Nb3Sn, Nb, and AI.
（従来の技術）
現在、実用化されている超電導線としては、Ｎｂ３Ｓｎ
やＮｂ、ＡＩなどの化合物系超電導体からなるものや、
Ｎｂ−ＴｉやＮｂ−Ｚｒなどの合金系超電導体からなる
ものが知られており、送電ケーブルや電力をほとんど消
費することなく強磁界の形成が可能な超電導コイルなど
の用途への利用が各所で研究されている。(Prior art) Currently, the superconducting wire in practical use is Nb3Sn.
Compound superconductors such as , Nb, and AI;
Superconductors made of alloy-based superconductors such as Nb-Ti and Nb-Zr are known, and are being used in various applications such as power transmission cables and superconducting coils that can generate strong magnetic fields without consuming much electricity. being researched.
ところで、たとえば医療用核磁気共鳴診断装置（以下Ｍ
ＲＩと記す）などにおいて使用する超電導コイルのよう
に、高精度で均一な磁界の形成が必要な際には、超電導
線間の接続方法が重要となる。すなわち、超電導線間の
接続部において超電導電流の流れが阻害されると、磁界
に乱れが生じるためである。このために、高精度の磁界
が必要とされる超電導コイルにおいては、接続が容易で
確実な合金系超電導線が主に使用されている。By the way, for example, medical nuclear magnetic resonance diagnostic equipment (hereinafter M
When it is necessary to form a highly accurate and uniform magnetic field, such as in superconducting coils used in RI, etc., the method of connecting superconducting wires is important. That is, if the flow of superconducting current is obstructed at the connection between superconducting wires, disturbances occur in the magnetic field. For this reason, in superconducting coils that require a highly accurate magnetic field, alloy-based superconducting wires, which are easy to connect and are reliable, are mainly used.
しかし、臨界温度や臨界磁場の点においては、合金系超
電導体に比べてＮｂ３ Ｓｎなどの化合物系超電導体の
方が優れているため、化合物系超電導線どうしの良好な
接続方法が強く望まれている。However, in terms of critical temperature and critical magnetic field, compound-based superconductors such as Nb3Sn are superior to alloy-based superconductors, so a good connection method for compound-based superconducting wires is strongly desired. There is.
そこで、たとえばブロンズ製マトリックス中に棒状のニ
オブフィラメントを埋設した、いわゆるブロンズ法によ
るＮｂ５ＳｎｔＥ？ＴＳ導線どうしを以下に示す方法に
よって接続することが試みられている。Therefore, for example, Nb5SntE is available using the so-called bronze method, in which rod-shaped niobium filaments are embedded in a bronze matrix. Attempts have been made to connect TS conductors to each other by the method described below.
まず、接続端部のブロンズマトリックスを薬品などで溶
かし、Ｎｂフィラメントをそれぞれ露出させる。次いで
、Ｎｂフィラメントどうしを重ね合せて接続し、接続部
の空隙に対して
■ ブロンズ粉末を充填する、
■ 銅粉末を充填した後、接続部全体にスズメツキを施
す、
■ 接続部をブロンズ浴やスズ浴を通すことによって、
空隙にブロンズやスズを充填する、などの処理を施した
後、接続部全体に銅などを被覆する。この後、接続部お
よび接続された超電導線全体にＮｂ３ Ｓｎ生成温度に
おける熱処理を施し、超電導線全体に超電導体相を形成
するとともに、接続部においても超電導体相を形成する
。First, the bronze matrix at the connection end is dissolved with a chemical or the like to expose each Nb filament. Next, the Nb filaments are overlapped and connected, and the gap in the connection part is filled with bronze powder. ■ After filling with copper powder, the entire connection part is tinted. ■ The connection part is bathed in a bronze bath or tin. By passing the bath
After performing a treatment such as filling the void with bronze or tin, the entire connection is coated with copper or the like. Thereafter, the connecting portion and the entire connected superconducting wire are subjected to heat treatment at the Nb3Sn formation temperature to form a superconducting phase in the entire superconducting wire and also in the connecting portion.
（発明が解決しようとする課題）
しかしながら、上述したようなブロンズ法によるＮｂ３
Ｓｎ線などの化合物系超電導線の接続方法では、接続
部に超電導体相を形成させるための工程、すなわち上記
した■〜■などの工程が繁雑であり、また上記■や■の
方法を適用した場合、ブロンズ粉末や銅粉末を空隙に均
等に充填することが困難であるために、超電導体相が長
手方向に均一に生成しないなどの問題があった。接続部
における超電導体相の生成が不均一であると、超電導体
相の連続性が接続部において阻害されたり、超電導体相
の断面積が不十分となる。このため、接続部の臨界電流
が低かったり、接続部の抵抗発生が大きくなるなど、種
々の欠点が発生する。(Problem to be solved by the invention) However, Nb3 by the bronze method as described above
In the method of connecting compound-based superconducting wires such as Sn wires, the steps for forming a superconducting phase at the connection part, that is, the steps ① to ② described above, are complicated, and the methods ① and ② above are not applied. In this case, it is difficult to uniformly fill the voids with bronze powder or copper powder, resulting in problems such as the superconductor phase not being formed uniformly in the longitudinal direction. If the superconductor phase is not produced uniformly at the connection, the continuity of the superconductor phase may be disturbed at the connection, or the cross-sectional area of the superconductor phase may be insufficient. For this reason, various drawbacks occur, such as a low critical current at the connection and an increase in resistance at the connection.
本発明は、このような従来技術の課題に対処するために
なされたもので、Ｎｂ３ ＳｎやＮｂ３＾Ｉなどの化ａ
物系超電導体を用いた超電導線どうしを容易に、かつ接
続部における臨界電流の劣化や抵抗発生を極力防止した
化合物系超電導線の接続方法を提供することを目的とし
ている。The present invention has been made to address the problems of the prior art, and is based on the use of a
It is an object of the present invention to provide a method for connecting compound-based superconducting wires that easily connects superconducting wires using a material-based superconductor and that prevents as much as possible the deterioration of critical current and the generation of resistance at the connection portion.
［発明の構成］
（課題を解決するための手段）
すなわち本発明の化合物系超電導線の接続方法は、内部
に第１の化合物系超電導体材料が充填された第２の化合
物系超電導体材料からなるチューブ状フィラメントを銅
を生成分とする安定化材中に １本または複数本埋設し
た化合物系超電導線の接続端部における前記安定化材を
それぞれ除去し、前記チューブ状フィラメントをそれぞ
れ露出させる工程と、これら露出されたチューブ状フィ
ラメントどうしを重ね合せて接続部を形成する工程と、
前記接続部に圧力と熱を加え隣接する前記チューブ状フ
ィラメント間を固相拡散接合する工程と、少なくとも前
記固相拡散接合された接続部に、前記第１および第２の
化合物系超電導体材料によって形成される化合物系超電
導体の生成温度における熱処理を施す工程とを経ること
を特徴としている。[Structure of the Invention] (Means for Solving the Problems) That is, the method for connecting a compound-based superconducting wire of the present invention includes connecting a first compound-based superconducting material to a second compound-based superconducting material filled with the first compound-based superconducting material. A step of removing each of the stabilizing materials at the connection end of a compound superconducting wire in which one or more tubular filaments are embedded in a stabilizing material containing copper as a component, and exposing each of the tubular filaments. and a step of overlapping these exposed tubular filaments to form a connection part,
solid phase diffusion bonding between the adjacent tubular filaments by applying pressure and heat to the connection portion, and at least the solid phase diffusion bonded connection portion using the first and second compound-based superconductor materials. The method is characterized by a step of performing heat treatment at the formation temperature of the compound-based superconductor to be formed.
本発明における化合物系超電導体としては、Ｎｂ３Ｓｎ
％Ｎｂ３Ａｌなどが例示される。また、本発明に用いら
れる第１および第２の化合物系超電導体材料は、これら
化合物系超電導体の形成材料であるＳｎとＮｂ、 ＡＩ
とＮｂなとである。これら化合物系超電導体材料を銅を
生成分とするマトリックス材中に埋設した構造体の具体
的な例としては、■ 第２の化合物系超電導体材料であ
るＮｂチューブ中に第１の化合物系超電導体材料として
Ｓｎコア上にＣｕを被覆したものやブロンズ合金を充填
して形成したチューブ状フィラメントの表面に、安定化
材としてＣｕ層やＣｕ合金層を設けたもの、■ 上記■
におけるチューブ状フィラメントの多数本をＣｕやＣｕ
合金からなる安定化材マトリックス中に埋設したもの、
■ 第２の化合物系超電導体材料であるＮｂチューブ中
に第１の化合物系超電導体材料としてＡＩやＡ１合金を
充填したチューブ状フィラメントの表面に、安定化材と
してＣｕ層やＣｕ合金層を設けたもの、■ 上記■にお
けるチューブ状フィラメントの多数本をＣｕやＣｕ合金
からなる安定化材マトリックス中に埋設したもの、
などが例示される。As the compound-based superconductor in the present invention, Nb3Sn
%Nb3Al etc. are exemplified. Furthermore, the first and second compound-based superconductor materials used in the present invention are Sn, Nb, and AI, which are the forming materials of these compound-based superconductors.
and Nb. Specific examples of structures in which these compound-based superconductor materials are embedded in a matrix material containing copper include: A body material in which a Sn core is coated with Cu or a tubular filament formed by filling a bronze alloy with a Cu layer or a Cu alloy layer as a stabilizing material,
A large number of tubular filaments in Cu or Cu
Embedded in a stabilizing material matrix made of an alloy, ■ On the surface of a tubular filament in which a Nb tube, which is a second compound superconductor material, is filled with AI or A1 alloy as a first compound superconductor material. , one in which a Cu layer or a Cu alloy layer is provided as a stabilizing material, and one in which a large number of tubular filaments in (2) above are embedded in a stabilizing material matrix made of Cu or a Cu alloy.
上記■〜■のＮｂチューブとしては、Ｎｂ１．：Ｔｌや
Ｔａなどを添加した合金を使用してもよく、また上記■
、■におけるＡ１合金としては、ＡＩ−”Ｍｎ合金やＡ
１にＧｅを添加した複合体などが例示される。Nb1. : An alloy to which Tl, Ta, etc. are added may be used, and the above
, ■A1 alloys include AI-''Mn alloy and A1 alloy.
An example is a composite obtained by adding Ge to 1.
本発明において接続部に圧力と熱とを加える工程は、露
出させたチューブ状フィラメントどうしを重ね合せて形
成した接続部に対して、適度な圧力とチューブ状フィラ
メントに使用した第２の化合物系超電導体材料の材質に
応じて選択された温度とを加え、隣接するチューブ状フ
ィラメント間を固相拡散接合し、後述する熱処理によっ
て接続部における隣接するチューブ状フィラメント間に
連続した超電導体相を生成するためのものである。In the present invention, the step of applying pressure and heat to the connection part involves applying appropriate pressure to the connection part formed by overlapping the exposed tubular filaments, and applying pressure and heat to the connection part formed by overlapping the exposed tubular filaments. A temperature selected according to the material of the body material is applied to perform solid-phase diffusion bonding between adjacent tubular filaments, and a continuous superconductor phase is generated between adjacent tubular filaments at the connection part by heat treatment described below. It is for.
この工程における加圧は、接続部における超電導体相の
連続形成距離を短縮させるために、接続部におけるチュ
ーブ状フィラメントが変形するよう一軸加圧を行うこと
が好ましい。Pressure in this step is preferably uniaxially applied so that the tubular filament at the connection section is deformed, in order to shorten the continuous formation distance of the superconductor phase at the connection section.
また、上記接続部に対して下記のいずれかを施すことに
より、接続部における超電導体相の連続性をより向上さ
せることが可能となる。Further, by applying any of the following to the above-mentioned connection part, it becomes possible to further improve the continuity of the superconductor phase in the connection part.
（ａ） 加圧・加熱工程において、チューブ状フィラ
メント内の第１の化合物系超電導体材料がはみだすよう
に圧力を加える。(a) In the pressurizing/heating step, pressure is applied so that the first compound-based superconductor material within the tubular filament protrudes.
（ｂ） 露出させたチューブ状フィラメントどうしを
重ね合せる前に、予めチューブ状フィラメントの管壁の
一部を除去し、その後にチューブ状フィラメントどうし
を重ね合せる。この除去するチューブ状フィラメントの
量は、管壁の肉厚が５０％〜７０％程度残るようにする
ことが好ましい。また、除去状態としては、円周全体に
対して均一に除去してもよいし、部分的に除去してもよ
い。(b) Before stacking the exposed tubular filaments, a portion of the tube wall of the tubular filaments is removed in advance, and then the tubular filaments are stacked together. The amount of tubular filament to be removed is preferably such that approximately 50% to 70% of the tube wall thickness remains. Furthermore, the state of removal may be uniformly removed over the entire circumference or may be removed partially.
この後、このようにして形成された接続部に対して、超
電導体相形成温度における熱処理を施し、接続部におけ
るチューブ状フィラメント内部がら生成した超電導体相
を成長させ、隣接するチューブ状フィラメント間を成長
した超電導体相によって接続する。Thereafter, the thus formed connection is subjected to heat treatment at a superconductor phase formation temperature to grow the superconductor phase generated inside the tubular filament at the connection, and to grow the superconductor phase between adjacent tubular filaments. Connected by the grown superconductor phase.
この熱処理は、真空下や不活性ガス雰囲気下などにおイ
テ、Ｎｂ３Ｓｎの場合には１３５０℃〜７７０’Ｃ程度
の温度で３時間〜３００時間程度、Ｎｂ３Ａｌ場合にハ
ロ８０℃〜９５０°Ｃ程度” ２Ｈ度テ０．３時間〜１
００時間程度の条件で行われ、超電導線本体における超
電導体相の形成とともに、あるいは予め超電導体相を形
成した超電導線を接続する際には、別途接続部のみに対
して行われる。This heat treatment is carried out under vacuum or an inert gas atmosphere, for about 3 hours to 300 hours at a temperature of about 1350°C to 770'C in the case of Nb3Sn, and at about 80°C to 950°C in the case of Nb3Al. ” 2H degrees 0.3 hours to 1
This is carried out under conditions of approximately 00 hours, and is carried out separately only on the connection portions when forming a superconductor phase in the superconducting wire body or when connecting superconducting wires on which a superconducting phase has been formed in advance.
また、本発明により得られる超電導線を熱処理可能な製
品に適用する場合、たとえば超電導コイルを形成するよ
うな場合には、コイル用の巻枠に熱処理前の素線を巻装
し、この状態で接続部を含む全体に上記熱処理を行うよ
うにしてもよい。In addition, when applying the superconducting wire obtained by the present invention to a product that can be heat treated, for example, when forming a superconducting coil, the wire before heat treatment is wound around a winding frame for the coil, and the wire is wrapped in this state. The above heat treatment may be applied to the entire structure including the connection portion.
（作 用）
本発明の化合物系超電導線の接続方法においては、いわ
ゆるチューブ法を用いた超電導線のチューブ状フィラメ
ントどうしを固相拡散により接合し、この接合部に対し
て少なくとも熱処理を施しているので、フィラメント内
部から生成する超電導体相を隣接するフィラメント側に
成長させることによって、異なるフィラメント間を超電
導体相で確実にかつ容易に繋げることが可能となる。(Function) In the method for connecting compound-based superconducting wires of the present invention, tubular filaments of superconducting wires are joined together by solid phase diffusion using the so-called tube method, and at least heat treatment is applied to this joint. Therefore, by growing the superconductor phase generated from inside the filament onto the adjacent filament side, it becomes possible to reliably and easily connect different filaments with the superconductor phase.
よって、異なるフィラメント間におけるｔｆｉ電導電流
の移行時にバリアとなる部分が存在せず、良好な超電導
特性を有する接続部が得られる。Therefore, there is no portion that acts as a barrier during the transition of the TFI conduction current between different filaments, and a connection portion having good superconducting properties can be obtained.
また、超電導線本体における超電導体相形成のための熱
処理とともに、接合部に対する熱処理を行っても、超電
導線本体でのチューブ状フィラメント内部から拡散する
第１の化合物系超電導体材料がチューブ外まで拡散する
ための距離より、接合部における拡散距離を加圧工程に
よって短くしているため、超電導線本体の安定化材が化
合物系超電導体構成元素によってｔ９染されることもな
い。In addition, even if heat treatment is performed on the joint part in addition to heat treatment to form a superconductor phase in the superconducting wire body, the first compound-based superconductor material that diffuses from inside the tubular filament in the superconducting wire body will diffuse to the outside of the tube. Since the diffusion distance at the joint is made shorter than the distance required for the bonding by the pressurizing process, the stabilizing material of the superconducting wire body is not t9-stained by the compound-based superconductor constituent elements.
（実施例） 次に、本発明の実施例について説明する。(Example) Next, examples of the present invention will be described.
実施例１
第１図は、この実施例のＮｂ３Ｓｎ超電導線の接続工程
を示す図である。同図において、符号１０は接続しよう
とするＮｂ３Ｓｎマルチ超電導素線である。Example 1 FIG. 1 is a diagram showing the process of connecting Nb3Sn superconducting wires in this example. In the figure, reference numeral 10 indicates an Nb3Sn multi-superconducting wire to be connected.
なおこのＮｂ３ Ｓｎマルチ超電導素線１０は、第２図
に示すように、Ｃｕからなる安定化材マトリックス１内
部に、Ｔ１を１重量％添加したＮｂチューブ２内にＳｎ
濃度が３０％になるようにＳｎ３線上にＣｕ被覆４を施
した複合体を充填したチューブ状Ｎｂフィラメント５が
２６４本分布配置されて構成されている。As shown in FIG. 2, this Nb3Sn multi-superconducting strand 10 is made of a stabilizer matrix 1 made of Cu and an Nb tube 2 in which 1% by weight of T1 is added.
264 tubular Nb filaments 5 filled with a composite of Sn3 wire and Cu coating 4 are arranged in a distributed manner so that the concentration is 30%.
まず、このＮｂ３ Ｓｎマルチ超電導素線１０の接続し
ようとする端部の安定化材マトリックス１を硝酸によっ
て約７０ｍｍ溶かし、チューブ状Ｎｂフィラメント５を
露出させた（第１図−八）。First, about 70 mm of the stabilizing material matrix 1 at the end of the Nb3Sn multi-superconducting wire 10 to be connected was dissolved with nitric acid to expose the tubular Nb filament 5 (FIG. 1-8).
次に、このようにしてチューブ状Ｎｂフィラメントを露
出させた ２本のＮｂ３Ｓｎマルチ超電導素線１０ａ、
１０ｂのチューブ状Ｎｂフィラメント５ａ。Next, two Nb3Sn multi-superconducting strands 10a with the tubular Nb filaments exposed in this way,
10b tubular Nb filament 5a.
５ｂどうしがよく混ざりあうように接触させて瑳り合わ
せ、接続部１１を形成した（第１図−Ｂ）。5b were brought into contact and glued together so that they were well mixed, thereby forming a connecting portion 11 (FIG. 1-B).
次いで、この接続部１１の周囲にＣｕからなるサポート
材１２を配置し、サポート材１２を介して圧力と熱を加
え、隣接するチューブ状Ｎｂフィラメント５ａ、５ｂ間
を固相拡散接合した（第１図−Ｃ）。この加圧・加熱工
程は、第３図に示すように、断面コ字形の収容部１２ａ
と圧力印加部１２ｂとからなるサポート材１２内に接続
部１１を配置しく第３図−Ａ）、圧力印加部１２ｂに対
して一軸方向から １５０ｋｇ／ｃｊの圧力を加えて、
接続部１１のチューブ状Ｎｂフィラメント５を充分に変
形させ（第３図−Ｂ）、この状態で加熱炉内に配置して
、ｔｏ’ 〜１Ｏ−５Ｔｏｒｒの真空中において４５０
℃×３０分の条件で熱処理を施した。なお、この加圧・
加熱工程の熱処理時間を６時間〜１２時間程度に長くと
り、チューブ状Ｎｂフィラメント５内のＳｎとＣｕを合
金化してブロンズとする工程を含めることも可能である
。Next, a support material 12 made of Cu is placed around this connection part 11, and pressure and heat are applied through the support material 12 to solid phase diffusion bond the adjacent tubular Nb filaments 5a and 5b (first Figure-C). This pressurizing/heating step is performed in the housing section 12a having a U-shaped cross section, as shown in FIG.
The connecting part 11 is arranged in the support material 12 consisting of the pressure applying part 12b and the pressure applying part 12b (Fig. 3-A), and a pressure of 150 kg/cj is applied from one axis to the pressure applying part 12b.
The tubular Nb filament 5 of the connecting part 11 is sufficiently deformed (Fig. 3-B), placed in a heating furnace in this state, and heated at 450° C. in a vacuum of to' to 1 O-5 Torr.
Heat treatment was performed at ℃×30 minutes. Note that this pressurization
It is also possible to include a step in which the heat treatment time of the heating step is increased to about 6 hours to 12 hours, and the Sn and Cu in the tubular Nb filament 5 are alloyed to form bronze.
この後、接続部１１を含む超電導素線１０全体を加熱炉
内に配置し、１０−４〜ｌ０−５Ｔｏｒｒの真空中にお
いてＮｂ３ Ｓｎの生成温度である ７００℃で約４０
時間熱処理を施し、超電導素線１０本体におけるＮｂチ
ューブと内部のＣｕ被覆を拡散してきたＳｎとを反応さ
せてＮｂ３Ｓｎ層を形成するとともに、接続部１１にお
ける異なるチューブ状Ｎｂフィラメント５間をＮｂ３
Ｓｎ層の成長によって繋げた（第１図−Ｄ）。Thereafter, the entire superconducting wire 10 including the connecting portion 11 is placed in a heating furnace, and heated in a vacuum of 10-4 to 10-5 Torr at 700°C, which is the generation temperature of Nb3Sn, at about 40°C.
A time heat treatment is performed to react the Nb tube in the main body of the superconducting wire 10 with the Sn that has diffused into the internal Cu coating to form an Nb3Sn layer, and also to form a Nb3Sn layer between the different tubular Nb filaments 5 in the connection part 11.
They were connected by growing a Sn layer (Fig. 1-D).
このようにしてＮＪＳｎ層の形成と線間の接続を同時に
行ったＮｂ３Ｓｎマルチ超電導線の接続部の状態を顕微
鏡によって断面観察したところ、第４図に示すように、
接続部１１における異なるチューブ状Ｎｂフィラメント
５間が、拡散するＳｎがＮｂチューブと反応することに
よって生成するＮｂ３ Ｓｎ層６の成長によって接続さ
れていた。また、このＮｂ３Ｓｎマルチ超電導線の４．
２に下での臨界電流と永久電流の減衰を、磁界下で測定
した。その結果、７Ｔの磁界中で臨界電流−５００Ａが
得られ、接続部を形成することなく同様にして形成した
Ｎｂ３ Ｓｎマルチ超電導線の約６０％と良好な値を示
した。また、１．５Ｔの磁界下で３００への電流を流し
て電流の減衰状態を２４時間に渡ってａ１定したところ
、７＋、流値の減衰は測定感度内（０，０１ｐｐｍ／時
＋ｒＳＩ ＞では観ａｌｌｌされず良好な超電導特性を
有する接続部であることを確認した。また、この実施例
の方法にしたがって、接続したＮｂ３ Ｓｎ超電導線を
２２本作製し、それぞれの臨界電流を測定したところ、
臨界電流のバラツキは２５％以内に収まり、再現性にも
優れていた。When the state of the connection part of the Nb3Sn multi-superconducting wire in which the NJSn layer was formed and the connections between the wires were simultaneously performed in this way was observed in cross section using a microscope, as shown in Figure 4.
The different tubular Nb filaments 5 in the connecting portion 11 were connected by the growth of a Nb3Sn layer 6 generated by the reaction of the diffused Sn with the Nb tube. In addition, 4. of this Nb3Sn multi-superconducting wire.
The decay of the critical current and persistent current under 2 hours was measured under a magnetic field. As a result, a critical current of -500 A was obtained in a magnetic field of 7 T, which was about 60% of that of the Nb3Sn multi-superconducting wire formed in the same manner without forming a connection, which was a good value. In addition, when a current was applied to 300 under a magnetic field of 1.5 T and the current attenuation state was constant at a1 for 24 hours, the attenuation of the current value was 7+, and the attenuation of the current value was within the measurement sensitivity (0.01 ppm/hour + rSI > It was confirmed that the connection part had good superconducting characteristics without being observed.Furthermore, 22 connected Nb3Sn superconducting wires were manufactured according to the method of this example, and the critical current of each was measured.
The variation in critical current was within 25%, and the reproducibility was excellent.
実施例２
実施例１において、露出させたチューブ状Ｎｂフィラメ
ントどうしを瑳り合わせて接続部を形成する前に、予め
Ｎｂチューブ管壁の厚さの約４０％を沸硝酸で溶す以外
は、実施例１と同一条件で接続部を有するＮｂ３ Ｓｎ
マルチ超電導線を作製した。Example 2 In Example 1, except that before gluing the exposed tubular Nb filaments together to form a connection part, about 40% of the thickness of the Nb tube wall was previously dissolved with boiling nitric acid. Nb3 Sn having a connection part under the same conditions as Example 1
A multi-superconducting wire was fabricated.
このようにして得たＮｂ３ Ｓｎマルチ超電導線につい
ても実施例１と同様にして臨界電流と永久電流の減衰を
測定した。その結果、７Ｔの磁界中で臨界電流５８０Ａ
が得られ、接続部を形成することなく同様にして形成し
たＮｂ３ Ｓｎマルチ超電導線の約７０％と良好な値を
示した。また、電流値の減衰は４−１感度度内（００１
ｐｐＩＩｌ／時間）では観測されず良好な超電導特性を
有する接続部であることを確認した。また、同様にして
作製した１６本のＮｂ３ Ｓｎ超電導線の臨界電流のバ
ラツキは２３％以内に収まった。Regarding the Nb3Sn multi-superconducting wire thus obtained, the attenuation of critical current and persistent current was measured in the same manner as in Example 1. As a result, the critical current is 580A in a 7T magnetic field.
was obtained, showing a good value of about 70% of that of the Nb3Sn multi-superconducting wire formed in the same manner without forming a connection part. Also, the attenuation of the current value is within 4-1 sensitivity (001
ppIIl/hour), confirming that the connection had good superconducting properties. Further, the variation in critical current of 16 Nb3Sn superconducting wires produced in the same manner was within 23%.
実施例３
実施例１において、露出させたチューブ状Ｎｂフィラメ
ントどうしを瑳り合わせて形成した接続部に対する加圧
・加熱工程の圧力条件を１８０ｋｇ／＋ｊにし、チュー
ブ状Ｎｂフィラメント内のＣｕを被覆したＳｎをはみだ
させる以外は、実施例１と同一条件で接続部を有するＮ
ｂ３ Ｓｎマルチ超電導線を作製した。Example 3 In Example 1, the pressure condition of the pressurizing/heating process for the connection part formed by gluing the exposed tubular Nb filaments together was set to 180 kg/+j, and the Cu inside the tubular Nb filaments was coated. N having a connection part under the same conditions as Example 1 except that Sn protrudes
b3 Sn multi-superconducting wire was produced.
このようにして得たＮｂ３ Ｓｎ超電導線についても実
施例１と同様にして臨界電流と永久電流の減衰を測定し
た。その結果、７Ｔの磁界中で臨界電流５５０Ａが得ら
れ、接続部を形成することなく同様にして形成したＮＪ
Ｓｎ超電導線の約６０％と良好な値を示した。また、電
流値の減衰は＃１定感度内（０，０１ｌ）ｐｆｆｌ／時
間）では観測されず良好な超電導特性を有する接続部で
あることを確認した。また、同様にして作製した１８本
のＮｂ３Ｓｎ？Ｂ電導線の臨界電流のバラツキは２０％
以内に収まった。Regarding the Nb3Sn superconducting wire thus obtained, the attenuation of critical current and persistent current was measured in the same manner as in Example 1. As a result, a critical current of 550 A was obtained in a magnetic field of 7 T, and an NJ formed in the same manner without forming a connection part was obtained.
It showed a good value of about 60% of that of Sn superconducting wire. Furthermore, no attenuation of the current value was observed within the #1 constant sensitivity (0,01l) pffl/hour), confirming that the connection had good superconducting properties. In addition, 18 Nb3Sn? The variation in critical current of B conducting wire is 20%.
It was within the range.
実施例４
まず、Ｃｕからなる安定化材マトリックス内部に、ＴＩ
を １重量％添加したＮｂチューブ内にＭｎを１０原子
％添加したＡ１合金線を充填したチューブ状Ｎｂフィラ
メントが２６４本分布配置したＮｂ３Ａｌマルチ超電導
素線を２不作製した。Example 4 First, TI was placed inside the stabilizer matrix made of Cu.
Two Nb3Al multi-superconducting strands were fabricated, in which 264 tubular Nb filaments filled with A1 alloy wire containing 10 atomic % of Mn were distributed in a Nb tube containing 1% of Mn by weight.
これらＮｂ３ Ａｌマルチ超電導素線端部の安定化材マ
トリックスを硝酸によって約７０ａ＋ａ溶かし、チュー
ブ状Ｎｂフィラメントを露出させ、次いで露出させたＮ
ｂチューブの厚さの約４０％を沸硝酸で溶した。The stabilizer matrix at the ends of these Nb3Al multi-superconducting strands was dissolved by about 70a+a with nitric acid to expose the tubular Nb filament, and then the exposed Nb
b Approximately 40% of the thickness of the tube was dissolved with boiling nitric acid.
次に、実施例１と同様にチューブ状Ｎｂフィラメントど
うしがよく混ざりあうように接触させて瑳り合わせて接
続部を形成し、この接続部に真空中で圧力と熱を加え（
４５０℃×４５分）、隣接するチューブ状Ｎｂフィラメ
ント間を固相拡散接合した。Next, as in Example 1, the tubular Nb filaments are brought into contact with each other so as to mix well and are glued together to form a connection part, and pressure and heat are applied to this connection part in a vacuum (
(450°C x 45 minutes), solid-phase diffusion bonding was performed between adjacent tubular Nb filaments.
この後、接続部を含むＮｂ３＾１マルチ超電導素線全体
を加熱炉内に配置し、１０−’ Ｔｏｒｒの真空中にお
いてＮｂ３ Ａｌの生成温度である ９５０℃で３０分
の後、７００℃で約９６時間熱処理を施し、超電導素線
本体におけるＮｂチューブとＡＩとを反応させてＮｂ３
Ａ１層を形成するとともに、接続部における異なるチ
ューブ状Ｎｂフィラメント間を生成するＮｂ３ Ａ１層
の成長によって繋げた。After this, the entire Nb3^1 multi-superconducting wire including the connection part was placed in a heating furnace, and after 30 minutes at 950°C, which is the generation temperature of Nb3Al, in a vacuum of 10-' Torr, it was heated at 700°C for about 30 minutes. After 96 hours of heat treatment, the Nb tube in the superconducting strand body reacts with AI to form Nb3.
The A1 layer was formed and the different tubular Nb filaments at the connection were connected by growing a Nb3 A1 layer.
このようにして得たＮｂ３ Ａｌマルチ超電導線につい
ても実施例１と同様にして臨界電流と永久電流の減衰を
ａｌｌｌ定した。その結果、７Ｔの磁界中で臨界電流３
００Ａが得られ、接続部を形成することなく同様にして
形成）７たＮｂ３ Ａｌマルチ超電導線の約５０％と良
好な値を示した。また、電流値の減衰は測定感度内（０
，０１ｐｐｍ／時間）では観測されず良好な超電導特性
を有する接続部であることを確認した。また、同様にし
て作製した１０本のＮｂ５Ａ＋超電導線の臨界電流のバ
ラツキは３０２６以内に収まった。For the Nb3Al multi-superconducting wire thus obtained, the attenuation of the critical current and persistent current was determined in the same manner as in Example 1. As a result, the critical current is 3 in a 7T magnetic field.
00A was obtained, showing a good value of about 50% of that of the Nb3Al multi-superconducting wire (formed in the same manner without forming a connection part). In addition, the attenuation of the current value is within the measurement sensitivity (0
, 01 ppm/hour), confirming that the connection had good superconducting properties. Moreover, the variation in critical current of 10 Nb5A+ superconducting wires produced in the same manner was within 3026.
［発明の効果］
以上説明したように本発明によれば、Ｎｂ３ＳｎやＮｂ
３＾ｌなどの化合物系超電導体を用いた超電導線を比較
的簡便に、再現性よく接続することが可能となり、かつ
接続部における超電導特性の低下も充分に抑制すること
が可能となる。[Effects of the Invention] As explained above, according to the present invention, Nb3Sn and Nb
It becomes possible to connect superconducting wires using compound-based superconductors such as 3^l relatively easily and with good reproducibility, and it also becomes possible to sufficiently suppress deterioration of superconducting properties at the connection portion.
第１図は本発明の一実施例のＮｂ３Ｓｎマルチ超電導線
の接続工程を示す図、第２図は本発明の一実施例に使用
したＮｂ３Ｓｎマルチ超電導線の構造を示す断面図、第
３図は第１図の接続工程における接続部の加圧・加熱工
程を説明するための図、第４図は本発明の一実施例によ
って接続した接続部の状態を模式的に示す図である。
１・・・・・・安定化材マトリックス、２・・・・・・
Ｎｂチューブ、
３ ・・・
・・Ｓｎ線、
５ ・・
・・・チューブ状フィラメ
ント、
・・・・・Ｎｂ３
Ｓｎ層、
０・・・・・・Ｎｂ３
Ｓｎｎマルチ超電水
素、
１・・・・・・接続部。FIG. 1 is a diagram showing the connection process of an Nb3Sn multi-superconducting wire according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the structure of the Nb3Sn multi-superconducting wire used in an embodiment of the present invention, and FIG. FIG. 1 is a diagram for explaining the pressurizing and heating process of the connection part in the connection process, and FIG. 4 is a diagram schematically showing the state of the connection part connected according to an embodiment of the present invention. 1... Stabilizing material matrix, 2...
Nb tube, 3...Sn wire, 5...tubular filament,...Nb3 Sn layer, 0...Nb3 Snn multi-superelectric hydrogen, 1...・Connection part.
Claims (4)
第２の化合物系超電導体材料からなるチューブ状フィラ
メントを銅を生成分とする安定化材中に１本または複数
本埋設した化合物系超電導線の接続端部における前記安
定化材をそれぞれ除去し、前記チューブ状フィラメント
をそれぞれ露出させる工程と、 これら露出されたチューブ状フィラメントどうしを重ね
合せて接続部を形成する工程と、 前記接続部に圧力と熱を加え隣接する前記チューブ状フ
ィラメント間を固相拡散接合する工程と、少なくとも前
記固相拡散接合された接続部に、前記第１および第２の
化合物系超電導体材料によって形成される化合物系超電
導体の生成温度における熱処理を施す工程と を経ることを特徴とする化合物系超電導線の接続方法。(1) A compound in which one or more tubular filaments made of a second compound superconductor material filled with the first compound superconductor material are embedded in a stabilizing material containing copper as a component. removing the stabilizing materials at the connection ends of the system superconducting wire to expose the tubular filaments, stacking the exposed tubular filaments together to form a connection, and the connection. solid phase diffusion bonding between the adjacent tubular filaments by applying pressure and heat to the portions, and forming at least the solid phase diffusion bonded connection portions with the first and second compound superconductor materials. 1. A method for connecting compound-based superconducting wires, comprising the step of performing heat treatment at a temperature at which a compound-based superconductor is formed.
一部を除去した後、前記接続部を形成することを特徴と
する請求項１記載の化合物系超電導線の接続方法。(2) The method for connecting compound superconducting wires according to claim 1, wherein the connecting portion is formed after removing a portion of the exposed tube wall of the tubular filament.
物超電導体材料を前記チューブ状フィラメント外にはみ
ださせることを特徴とする請求項１記載の化合物系超電
導線の接続方法。(3) The method for connecting compound superconducting wires according to claim 1, wherein the first compound superconductor material is caused to protrude outside the tubular filament when applying pressure to the connecting portion.
合物系超電導体層の形成と、化合物系超電導線本体にお
ける化合物系超電導体層の形成とを同時に行うことを特
徴とする請求項１記載の化合物系超電導線の接続方法。(4) The compound system according to claim 1, wherein in the heat treatment step, the formation of the compound system superconductor layer in the connection portion and the formation of the compound system superconductor layer in the compound system superconducting wire body are performed simultaneously. How to connect superconducting wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1015876A JP2848618B2 (en) | 1989-01-25 | 1989-01-25 | How to connect compound superconducting wires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1015876A JP2848618B2 (en) | 1989-01-25 | 1989-01-25 | How to connect compound superconducting wires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02197017A true JPH02197017A (en) | 1990-08-03 |
| JP2848618B2 JP2848618B2 (en) | 1999-01-20 |
Family
ID=11900993
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|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6543123B1 (en) | 1999-04-20 | 2003-04-08 | Composite Materials Technology, Inc. | Process for making constrained filament niobium-based superconductor composite |
| US6836955B2 (en) | 2000-03-21 | 2005-01-04 | Composite Materials Technology, Inc. | Constrained filament niobium-based superconductor composite and process of fabrication |
| US7146709B2 (en) | 2000-03-21 | 2006-12-12 | Composite Materials Technology, Inc. | Process for producing superconductor |
| JP2007081244A (en) * | 2005-09-15 | 2007-03-29 | Institute Of Physical & Chemical Research | METHOD FOR CONNECTING Nb3Al SUPER-CONDUCTION COIL |
| WO2010090023A1 (en) | 2009-02-05 | 2010-08-12 | 株式会社 東芝 | Superconductive conductor connecting method and superconductive coil |
| US8858738B2 (en) | 2006-09-26 | 2014-10-14 | Composite Materials Technology, Inc. | Methods for fabrication of improved electrolytic capacitor anode |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102154674B1 (en) * | 2018-09-07 | 2020-09-10 | (주)금룡테크 | Method of bonding superconducting wire |
-
1989
- 1989-01-25 JP JP1015876A patent/JP2848618B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6543123B1 (en) | 1999-04-20 | 2003-04-08 | Composite Materials Technology, Inc. | Process for making constrained filament niobium-based superconductor composite |
| US6836955B2 (en) | 2000-03-21 | 2005-01-04 | Composite Materials Technology, Inc. | Constrained filament niobium-based superconductor composite and process of fabrication |
| US7146709B2 (en) | 2000-03-21 | 2006-12-12 | Composite Materials Technology, Inc. | Process for producing superconductor |
| US7480978B1 (en) | 2000-03-21 | 2009-01-27 | Composite Materials Technology, Inc. | Production of electrolytic capacitors and superconductors |
| JP2007081244A (en) * | 2005-09-15 | 2007-03-29 | Institute Of Physical & Chemical Research | METHOD FOR CONNECTING Nb3Al SUPER-CONDUCTION COIL |
| US8858738B2 (en) | 2006-09-26 | 2014-10-14 | Composite Materials Technology, Inc. | Methods for fabrication of improved electrolytic capacitor anode |
| WO2010090023A1 (en) | 2009-02-05 | 2010-08-12 | 株式会社 東芝 | Superconductive conductor connecting method and superconductive coil |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2848618B2 (en) | 1999-01-20 |
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