JPH05325677A - Manufacture of nb3al type superconductor - Google Patents
Manufacture of nb3al type superconductorInfo
- Publication number
- JPH05325677A JPH05325677A JP4162298A JP16229892A JPH05325677A JP H05325677 A JPH05325677 A JP H05325677A JP 4162298 A JP4162298 A JP 4162298A JP 16229892 A JP16229892 A JP 16229892A JP H05325677 A JPH05325677 A JP H05325677A
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- powder
- nb3al
- manufacture
- type superconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
【０００１】[0001]
【産業上の利用分野】この発明は高臨界磁場、高臨界電
流を有するＮｂ3 Ａｌ系超電導体を簡便に製造する方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily producing an Nb 3 Al based superconductor having a high critical magnetic field and a high critical current.
【０００２】[0002]
【従来の技術】Ｎｂ3 Ａｌ系超電導体の製造方法には、
ニオブチューブ法、クラッドチップ法、ジェリーロール
法、粉末法など色々な方があるが、基本的にはＮｂとＡ
ｌの複合材を伸線し、熱処理によりＮｂ3 Ａｌを生成さ
せて線材を作ろうというものである。化学量論的に良好
なＮｂ3 Ａｌを得るには、強加工による細線化薄肉化が
不可欠であるが、それにもまして反応前熱処理として、
１０００°Ｃを越える高温のパルス的な一瞬の熱処理、
例えば１０００°Ｃ、３０秒の加熱後、すぐに液体窒素
で急冷する熱処理が必要であり、これが線材の長尺化の
妨げとなっている。2. Description of the Related Art A method of manufacturing a Nb 3 Al superconductor is
There are various methods such as niobium tube method, clad chip method, jelly roll method, and powder method, but basically, Nb and A
This is to draw a composite material of 1 and to produce Nb 3 Al by heat treatment to make a wire. In order to obtain stoichiometrically good Nb 3 Al, thinning and thinning by strong working are indispensable.
High-temperature pulse-like instantaneous heat treatment exceeding 1000 ° C,
For example, after heating at 1000 ° C. for 30 seconds, a heat treatment of immediately quenching with liquid nitrogen is required, which hinders the lengthening of the wire rod.
【０００３】また、上記の製造法とは別に、金属間化合
物Ｎｂ2 Ａｌ（σ相）とＮｂを出発材料とした、粉末法
がある。この方法は、ＮｂあるいはＴａのチューブに、
Ｎｂ2 ＡｌとＮｂの粉末を詰めて溝ロール圧延や平ロー
ル圧延等で線材にした後、熱処理によって、 Ｎｂ2 Ａｌ＋Ｎｂ→Ｎｂ3 Ａｌ の反応を起こさせて、Ｎｂ3 Ａｌ系超電導線材を得る方
法である。熱処理は１０００°Ｃを越える温度で数時間
行なわなければならないが、長尺線材製造の可能性のあ
る方法である。金属間化合物Ｎｂ2 Ａｌ（σ相）とＮｂ
を出発材料とした粉末法は、まずＮｂ、Ａｌ、Ｇｅから
アーク溶解等でＮｂ2 Ａｌ又はＮｂ2(Ａｌ，Ｇｅ）のイ
ンゴットを作り、これを粉砕して粉末にする。このＮｂ
2 Ａｌ又はＮｂ2(Ａｌ，Ｇｅ）の粉末とＮｂの粉末とを
混合し、圧縮成形するか、又はＮｂやＴａのチューブに
充填して溝ロール圧延や平ロール圧延で線材にした後、
熱処理によって反応させてＮｂ3 Ａｌ又はＮｂ3(Ａｌ，
Ｇｅ) 超電導体を製造するものである。In addition to the above-mentioned manufacturing method, there is a powder method using an intermetallic compound Nb 2 Al (σ phase) and Nb as starting materials. This method applies to Nb or Ta tubes,
A method of obtaining Nb 3 Al-based superconducting wire by filling powder of Nb 2 Al and Nb and making a wire by groove roll rolling or flat roll rolling, and then causing a reaction of Nb 2 Al + Nb → Nb 3 Al by heat treatment. Is. The heat treatment must be carried out at a temperature over 1000 ° C. for several hours, which is a potential method for producing long wire rods. Intermetallic compound Nb 2 Al (σ phase) and Nb
In the powder method using as a starting material, first, an ingot of Nb 2 Al or Nb 2 (Al, Ge) is made from Nb, Al, and Ge by arc melting or the like, and the ingot is pulverized into powder. This Nb
2 Al or Nb 2 (Al, Ge) powder and Nb powder are mixed and compression molded, or filled in a Nb or Ta tube and formed into a wire rod by groove roll rolling or flat roll rolling,
Nb 3 Al or Nb 3 (Al,
Ge) A superconductor is manufactured.
【０００４】[0004]
【発明が解決しようとする課題】一般にＮｂ2(Ａｌ，
Ｍ）やＮｂの拡散は遅く、これらの２相が反応して超電
導相Ｎｂ3(Ａｌ，Ｍ) が生成する速度は遅い。従って、
これを線材にすると、線の端から端までが超電導相でつ
ながっているのではなく、電子のしみだしによる近接効
果でつながっている箇所が数多くあり、安定した高臨界
電流を有するＮｂ3 Ａｌ系超電導線材の製造は困難であ
る。この発明は、かかる問題点に鑑み、安定した高臨界
電流を有するＮｂ3 Ａｌ系超電導体を簡便に製造できる
ようにしたＮｂ3 Ａｌ系超電導体の製造方法を提供する
ことを課題とする。Generally, Nb 2 (Al,
The diffusion of M) and Nb is slow, and the rate at which these two phases react to form the superconducting phase Nb 3 (Al, M) is slow. Therefore,
If this is used as a wire rod, the end to end of the wire is not connected by a superconducting phase, but there are many points connected by the proximity effect due to the exudation of electrons, and it is a Nb 3 Al-based material that has a stable high critical current. It is difficult to manufacture a superconducting wire. The present invention, in view of such problems, it is an object of the invention to provide a method for producing a stable Nb 3 Al-based Nb 3 Al superconducting body as a superconductor can be easily manufactured with high critical current.
【０００５】[0005]
【課題を解決するための手段】そこで本発明に係るＮｂ
3 Ａｌ系超電導体の製造方法は、金属間化合物Ｎｂ2(Ａ
ｌ，Ｍ) と、Ｎｂ又はＮｂ合金を反応させることによっ
てＮｂ3(Ａｌ，Ｍ) 超電導体を製造するに際し、Ｎｂ
2(Ａｌ，Ｍ) とＮｂを主成分とする合金にＮｂ3(Ａｌ，
Ｍ) を１〜１０重量％添加するようにしたことを要旨と
する。ここでＮｂ3(Ａｌ，Ｍ) における金属元素ＭはＡ
ｌ、Ｇｅ、Ｓｉ、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｔａである。Therefore, Nb according to the present invention
3 Al-based superconductor manufacturing method is based on the intermetallic compound Nb 2 (A
In producing a Nb 3 (Al, M) superconductor by reacting Nb or an Nb alloy with Nb,
Nb 3 (Al, M) is added to the alloy containing 2 (Al, M) and Nb as main components.
The gist is to add 1 to 10% by weight of M). Here, the metal element M in Nb 3 (Al, M) is A
1, Ge, Si, Ti, Zr, Hf, V and Ta.
【０００６】[0006]
【作用】本発明においては、Ｎｂ2(Ａｌ，Ｍ) とＮｂを
主成分とする合金にＮｂ3(Ａｌ，Ｍ) を１〜１０％添加
し、反応させるようにしたことから、Ｎｂ3 ＡｌがＮｂ
2 Ａｌ＋Ｎｂ→Ｎｂ3 Ａｌの反応を促進させる。また、
最初から超電導相であるＮｂ3 Ａｌが存在することか
ら、導体を作ったときに、たとえ未反応のＮｂ2 Ａｌや
Ｎｂが存在しても超電導相Ｎｂ3 Ａｌ同志の直接接触で
つながる箇所が増加する。なお、Ｎｂ3(Ａｌ，Ｍ) の添
加量を１〜１０％としたのは、１％未満では反応促進、
及び超電導相の直接接触の効果が得られず、又１０％を
越えると、反応には問題はないが、そもそもＮｂ3(Ａ
ｌ，Ｍ）を多量に作るのが困難であるため、少量を添加
することにより、Ｎｂ2(Ａｌ，Ｍ）からＮｂ3(Ａｌ，
Ｍ）を得るための方法であるので、多量に添加するのは
無意味である。According to the present invention, since it has the Nb 2 (Al, M) and alloy Nb 3 (Al, M) mainly composed of Nb was added 1-10%, so as to react, Nb 3 Al Is Nb
The reaction of 2 Al + Nb → Nb 3 Al is promoted. Also,
Since Nb 3 Al, which is a superconducting phase, exists from the beginning, even when unreacted Nb 2 Al and Nb exist when the conductor is made, the number of places where the superconducting phase Nb 3 Al is directly connected increases. To do. The amount of Nb 3 (Al, M) added is set to 1 to 10% because the reaction is promoted when the amount is less than 1%.
Also, the effect of direct contact with the superconducting phase cannot be obtained, and if it exceeds 10%, there is no problem in the reaction, but Nb 3 (A
Since it is difficult to make a large amount of Nb 2 (Al, M), Nb 2 (Al, M) to Nb 3 (Al, M,
Since it is a method for obtaining M), adding a large amount is meaningless.
【０００７】[0007]
【実施例】実施例１ ＮｂとＡｌの小片をアーク溶解で１気圧Ａｒ雰囲気中で
溶解し、インゴットを作った。インゴットを粉砕して粉
末とし、これにＮｂ3 Ａｌ粉末を５％添加した。この混
合粉末の粉末Ｘ線回析による分析結果を図１に示す。図
１から分かるように、上記混合粉末はＮｂ2 ＡｌとＮｂ
3 Ａｌの混合物である。このＮｂ2 ＡｌとＮｂ3 Ａｌの
混合粉末を出発原料とし、これにＮｂの粉末を混合し、
Ｎｂのチューブに充填して溝ロール圧延で伸線加工し
た。この線材に反応熱処理を施し、Ｎｂ3 Ａｌ導体を作
った。Ｎｂ2 Ａｌ粉末を出発原料とする以外、実施例１
と同様の方法により、Ｎｂ3Ａｌ導体（比較例１）を作
った。この比較例１及び実施例１の特性を図２に示す。
これから、Ｎｂ2 ＡｌとＮｂ3 Ａｌの混合物を出発原料
とした実施例１の方が比較例１よりも高臨界電流密度、
高臨界磁場が得られることが分かる。また、実施例１の
反応処理時間は比較例１の１／２となり、処理時間を大
幅に短縮できた。さらに、臨界温度は実施例１では１８
Ｋであり、比較例１の１６Ｋよりも高温であった。 Example 1 A small piece of Nb and Al was melted in an Ar atmosphere at 1 atm by arc melting to form an ingot. The ingot was crushed into powder, and 5% of Nb 3 Al powder was added thereto. The analysis result of this mixed powder by powder X-ray diffraction is shown in FIG. As can be seen from FIG. 1, the mixed powder is Nb 2 Al and Nb.
It is a mixture of 3 Al. The mixed powder of Nb 2 Al and Nb 3 Al is used as a starting material, and the powder of Nb is mixed with this as a starting material.
The tube was filled with Nb and drawn by groove roll rolling. This wire was subjected to a reactive heat treatment to make an Nb 3 Al conductor. Example 1 except using Nb 2 Al powder as a starting material
A Nb 3 Al conductor (Comparative Example 1) was produced by the same method as described above. The characteristics of Comparative Example 1 and Example 1 are shown in FIG.
From this, it can be seen that Example 1 using a mixture of Nb 2 Al and Nb 3 Al as a starting material has a higher critical current density than Comparative Example 1,
It can be seen that a high critical magnetic field can be obtained. In addition, the reaction treatment time of Example 1 was half that of Comparative Example 1, and the treatment time could be greatly shortened. Further, the critical temperature is 18 in Example 1.
K, which was higher than 16K of Comparative Example 1.
【０００８】実施例２ Ｎｂ3 Ａｌ粉末を１〜１０％、0.5 ％（比較例２）を各
々添加した混合粉末を出発原料とし、実施例１と同様
に、超電導体を作った。添加量が１％未満の比較例２で
は上記比較例１と同様の特性しか得られなかった。 Example 2 A superconductor was prepared in the same manner as in Example 1 except that a mixed powder containing 1% to 10% Nb 3 Al powder and 0.5% (Comparative Example 2) was used as a starting material. In Comparative Example 2 in which the addition amount was less than 1%, only the same characteristics as in Comparative Example 1 were obtained.
【０００９】[0009]
【発明の効果】以上のように、本発明に係るＮｂ3 Ａｌ
系超電導体の製造方法によれば、反応熱処理時間を短縮
でき、低コスト化を実現でき、さらに臨界電流及び臨界
温度を向上できた。As described above, the Nb 3 Al according to the present invention is
According to the method for manufacturing a superconductor, the reaction heat treatment time can be shortened, the cost can be reduced, and the critical current and the critical temperature can be improved.
【図１】 Ｎｂ2 ＡｌとＮｂ3 Ａｌの混合粉末の粉末Ｘ
線回析の結果を示す図である。FIG. 1 Powder X of a mixed powder of Nb 2 Al and Nb 3 Al
It is a figure which shows the result of line diffraction.
【図２】 実施例１と比較例１における磁束密度に対す
る臨界電流密度を示す図である。FIG. 2 is a diagram showing a critical current density with respect to a magnetic flux density in Example 1 and Comparative Example 1.
フロントページの続き (72)発明者 溝俣 洋一 神戸市西区高塚台１丁目５−５株式会社神 戸製鋼所西神総合研究地区内 (72)発明者 宮崎 隆好 神戸市西区高塚台１丁目５−５株式会社神 戸製鋼所西神総合研究地区内Front page continuation (72) Inventor Yoichi Mizomata 1-5-5, Takatsukadai, Nishi-ku, Kobe City Kamito Steel Works, Ltd. Seishin Research Center (72) Inventor Takayoshi Miyazaki 1-5, Takatsukadai, Nishi-ku, Kobe -5 Kamido Steel Works Seishin Research Area
Claims (1)
又はＮｂ合金とを反応させることによってＮｂ3(Ａｌ，
Ｍ) 超電導体を製造するに際し、 Ｎｂ2(Ａｌ，Ｍ) とＮｂを主成分とする合金に、Ｎｂ
3(Ａｌ，Ｍ) （但し、Ｍ：Ａｌ、Ｇｅ、Ｓｉ、Ｔｉ、Ｚ
ｒ、Ｈｆ、Ｖ、Ｔａ）を１〜１０重量％添加することを
特徴とするＮｂ3 Ａｌ系超電導体の製造方法。1. An intermetallic compound Nb 2 (Al, M) and Nb
Alternatively, Nb 3 (Al,
M) When manufacturing a superconductor, Nb 2 (Al, M) and an alloy containing Nb as the main component are mixed with Nb
3 (Al, M) (However, M: Al, Ge, Si, Ti, Z
r, Hf, V, Ta) is added in an amount of 1 to 10% by weight, and a method for producing an Nb 3 Al-based superconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4162298A JPH05325677A (en) | 1992-05-27 | 1992-05-27 | Manufacture of nb3al type superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4162298A JPH05325677A (en) | 1992-05-27 | 1992-05-27 | Manufacture of nb3al type superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05325677A true JPH05325677A (en) | 1993-12-10 |
Family
ID=15751842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4162298A Withdrawn JPH05325677A (en) | 1992-05-27 | 1992-05-27 | Manufacture of nb3al type superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05325677A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5620532A (en) * | 1992-11-30 | 1997-04-15 | Hitachi, Ltd. | Method for manufacturing Nb3 Al group superconductor |
-
1992
- 1992-05-27 JP JP4162298A patent/JPH05325677A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5620532A (en) * | 1992-11-30 | 1997-04-15 | Hitachi, Ltd. | Method for manufacturing Nb3 Al group superconductor |
| US5628835A (en) * | 1992-11-30 | 1997-05-13 | Hitachi, Ltd. | Nb3 Al Group superconductor containing ultrafine Nb2 Al particles |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990803 |