JP3050580B2 - Method for producing Nb-Ti alloy superconducting wire - Google Patents
Method for producing Nb-Ti alloy superconducting wireInfo
- Publication number
- JP3050580B2 JP3050580B2 JP2245056A JP24505690A JP3050580B2 JP 3050580 B2 JP3050580 B2 JP 3050580B2 JP 2245056 A JP2245056 A JP 2245056A JP 24505690 A JP24505690 A JP 24505690A JP 3050580 B2 JP3050580 B2 JP 3050580B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- wire
- superconducting wire
- diameter
- tube
- 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.)
- Expired - Lifetime
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Classifications
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- 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
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- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、臨界電流密度（Jc）を向上させるNb−Ti合
金超電導線の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing an Nb-Ti alloy superconducting wire for improving a critical current density (Jc).
現在、超電導マグネット等に使用される超電導線とし
て、Nb−Ti合金超電導線が多用されている。At present, Nb-Ti alloy superconducting wires are frequently used as superconducting wires used for superconducting magnets and the like.
従来、前記Nb−Ti合金超電導線は下記の方法により製
造されていた。即ち第２図に示す様に、Ti濃度を40〜60
wt％の範囲内で調整したNb−Ti合金鋳塊１をCu又はCu合
金管２に挿入し、押出し、引抜きによりCu被覆Nb−Ti合
金棒3bとしたものの複数本を束ねて、Cu又はCu合金管２
に挿入した後、これを複合加工法により一体化したもの
を素線4aとし、該素線4aの複数本を再びCu又はCu合金管
２に挿入した後、押出し、引抜き等の複合加工法により
一体化し、縮径して複合線５とする工程を所望回繰り返
して、所定の線径、フィラメント径を有する超電導線が
得られる。Conventionally, the Nb-Ti alloy superconducting wire has been manufactured by the following method. That is, as shown in FIG.
The Nb-Ti alloy ingot 1 adjusted within the range of wt% is inserted into a Cu or Cu alloy tube 2, and a plurality of Cu-coated Nb-Ti alloy rods 3b are bundled by extruding and drawing to form Cu or Cu. Alloy tube 2
After being inserted into the tube, a wire 4a is obtained by integrating the wires 4a, and a plurality of wires 4a are inserted into the Cu or Cu alloy tube 2 again, and then extruded, drawn, or the like. The step of integrating and reducing the diameter to form the composite wire 5 is repeated a desired number of times to obtain a superconducting wire having a predetermined wire diameter and filament diameter.
ところで超電導線の臨界電流密度Jcは材料内の析出粒
子、転位、結晶粒界などのミクロな組織因子によって決
定され、材料の処理条件に強く依存している。Nb−Ti合
金超電導線の場合製造工程中の強加工と熱処理によりα
−Ti相が析出し、これがピンニングセンターとなり前記
Jcの向上に大きく寄与している。このα−Ti相の析出は
Nb−Ti合金の結晶粒内や粒界に生じるが、Jcの向上に対
する効果はα−Ti相の析出状態によって異なり、従来は
最終熱処理の後、加工歪εｆが3.0〜6.0程度の強加工を
加え、上記α−Ti相をリボン状に変形させ、さらに適度
に分散させてα−Ti相のピンニング力と加工セル組織に
よるピンニング力を調節してJcの向上を図っていた。た
だしJc向上の主要な因子はα−Ti相によるピンニングで
あると考えられる。Incidentally, the critical current density Jc of a superconducting wire is determined by microstructural factors such as precipitated particles, dislocations, and crystal grain boundaries in a material, and strongly depends on the processing conditions of the material. In the case of Nb-Ti alloy superconducting wire, α
-Ti phase is precipitated, and this becomes a pinning center.
It has greatly contributed to the improvement of Jc. The precipitation of this α-Ti phase
Although it occurs in the crystal grains of the Nb-Ti alloy and at the grain boundaries, the effect on the improvement of Jc depends on the precipitation state of the α-Ti phase. Conventionally, after the final heat treatment, the working strain ε f is about 3.0 to 6.0. In addition, the α-Ti phase was deformed into a ribbon shape and further appropriately dispersed to adjust the pinning force of the α-Ti phase and the pinning force due to the processing cell structure to improve Jc. However, it is considered that the main factor for improving Jc is pinning due to the α-Ti phase.
ここで加工歪みεｆは次式に示される数値である。Here, the processing strain ε f is a numerical value represented by the following equation.
εｆ＝ln（A1/A0） A1:加工前の線材断面積 A0:加工後の線材断面積 〔発明が解決しようとする課題〕 しかるにこのような従来の技術では、α−Ti相の析出
状態は不規則であり、充分に制御することができず、経
験的手法に頼らざるを得ない。ε f = ln (A 1 / A 0 ) A 1 : cross-sectional area of wire before processing A 0 : cross-sectional area of wire after processing [Problem to be Solved by the Invention] However, in such a conventional technique, α-Ti The precipitation state of the phase is irregular, cannot be sufficiently controlled, and must rely on empirical techniques.
最近のJc向上に対する要求に対応するためにはα−Ti
相の析出をよりよく制御し、そのピンニング効果を増大
させる必要があるが、このような問題は未だ解決されて
いない。To respond to the recent demand for Jc improvement, α-Ti
There is a need to better control phase precipitation and increase its pinning effect, but such problems have not been solved.
本発明は、上記問題点を解決する為に、鋭意検討の結
果なされたものであり、その目的とするところは、ピン
ニングセンターとなるα−Ti相の分布や体積分率を効率
的に制御し、高Jcを有するNb−Ti合金超電導線が得られ
る製造方法を提供する点にある。The present invention has been made as a result of intensive studies in order to solve the above problems, and its purpose is to efficiently control the distribution and volume fraction of the α-Ti phase serving as a pinning center. Another object of the present invention is to provide a method for producing an Nb-Ti alloy superconducting wire having a high Jc.
即ち、本発明における請求項１の発明は、表面にTiを
被覆した複数本のNb−Ti合金棒を束ねて、Cu又はCu合金
管に挿入した後、これを複合加工法により一体化したも
のを素線とし、該素線の複数本を再びCu又はCu合金管に
挿入した後、複合加工法により一体化し、縮径する工程
を所望回数繰り返す事を特徴とするNb−Ti合金超電導線
の製造方法である。That is, the invention of claim 1 of the present invention is a method in which a plurality of Nb-Ti alloy rods each having a surface coated with Ti are bundled, inserted into a Cu or Cu alloy tube, and then integrated by a composite processing method. Is a wire, after inserting a plurality of the wires again into the Cu or Cu alloy pipe, integrated by a complex processing method, repeating the step of reducing the diameter of the Nb-Ti alloy superconducting wire characterized by repeating the desired number of times It is a manufacturing method.
本発明においては、個々のNb−Ti合金棒の表面にTiを
被覆してから、複数本のNb−Ti合金棒を束ねて、Cu又は
Cu合金管に挿入し、これを複合加工法により一体化した
ものを素線として用いるので、これらのTiもピンニング
センターとして作用し、より効果的である。In the present invention, after coating the surface of each Nb-Ti alloy rod with Ti, a plurality of Nb-Ti alloy rods are bundled, and Cu or
Since it is inserted into a Cu alloy tube and integrated using a composite processing method is used as a strand, these Tis also act as pinning centers, which is more effective.
又複合加工は、押出し及び／又は引抜き加工により行
うのが望ましい。It is desirable that the composite processing is performed by extrusion and / or drawing.
第１図は、本発明の１実施態様を示す工程説明図であ
って、Tiを被覆したNb−Ti合金鋳塊１をCu合金管２に挿
入した複合体を押出し、引抜きによって一体化し（3
b）、Cuを除去して作製したTi/Nb−Ti合金棒3aの複数本
を、Cu又はCu合金管２に挿入し、複合加工法により一体
化して素線4aとした後、さらに表面のCu又はCu合金層を
硝酸等で除去してTi/Nb−Ti合金からなる素線4bとし、
該素線4bの複数本を再びCu又はCu合金管２に挿入した
後、複合加工法により一体化し、縮径して複合線５とす
る工程を所望回数繰り返して、所定の線径、フィラメン
ト径を有する超電導線が得られる。FIG. 1 is a process explanatory view showing one embodiment of the present invention, in which a composite in which a Nb—Ti alloy ingot 1 coated with Ti is inserted into a Cu alloy tube 2 is extruded and integrated by drawing (3).
b) Inserting a plurality of Ti / Nb-Ti alloy rods 3a prepared by removing Cu into a Cu or Cu alloy tube 2 and integrating them into a wire 4a by a composite processing method, and further forming a wire 4a. Cu or Cu alloy layer is removed with nitric acid or the like to obtain a wire 4b made of Ti / Nb-Ti alloy,
After inserting a plurality of the wires 4b into the Cu or Cu alloy tube 2 again, they are integrated by a composite processing method, and the process of reducing the diameter to obtain the composite wire 5 is repeated a desired number of times, thereby obtaining a predetermined wire diameter and a predetermined filament diameter. Is obtained.
尚前記素線4aの表面のCu又はCu合金層を除去する工程
は必ずしも必要ではなく、この工程を行わなくても、各
々の素線4aの内部の複数本のTi/Nb−Ti合金棒は互いに
接触して界面を形成しており、これらの接触界面は所望
回数複合加工を繰り返すことにより微細化して、α−Ti
の析出サイトとなったり、また被覆したTiそのものも微
細化してピンニングセンターとして有効に作用する。Incidentally, the step of removing the Cu or Cu alloy layer on the surface of the wire 4a is not necessarily required, and even without performing this step, a plurality of Ti / Nb-Ti alloy rods inside each wire 4a These contact interfaces are in contact with each other to form interfaces, and these contact interfaces are refined by repeating the complex processing a desired number of times, and α-Ti
And the coated Ti itself becomes finer, effectively acting as a pinning center.
本発明は、複数本のTi/Nb−Ti合金棒を束ねて、複合
加工法により一体化したものを素線とし、該素線の複数
本を再びCu又はCu合金管に挿入した後、複合加工法によ
り一体化し、縮径する工程を所望回数繰り返す事によ
り、Ti/Nb−Tiフィラメント同志の接触界面を充分に微
細化させ、熱処理によりこの接触界面にα−Ti相を析出
させ、同時にNb−Tiフィラメントに被覆したTiそのもの
もピンニングセンターとして作用させようとするもので
ある。従って従来の単に結晶粒界にのみα−Ti相を析出
させていた場合に比べて、該α−Ti相の析出が容易にな
るばかりでなく、Nb−Ti棒に被覆したTiそのものもピン
ニングセンターとして作用するので、従来法に比べてピ
ンニングセンターの大きさ、間隔、配置等を線材の設計
の段階で自由に制御することが可能であり、Jcの大幅な
向上が可能となる。The present invention provides a wire obtained by bundling a plurality of Ti / Nb-Ti alloy rods and integrating them by a composite processing method, and after inserting a plurality of the wires again into a Cu or Cu alloy tube, The contact interface between the Ti / Nb-Ti filaments is sufficiently refined by repeating the process of integrating and reducing the diameter by a desired number of times by a processing method, and an α-Ti phase is precipitated at the contact interface by heat treatment, and simultaneously Nb -Ti itself coated on the Ti filament is also intended to act as a pinning center. Therefore, as compared with the conventional case where the α-Ti phase is precipitated only at the crystal grain boundaries, not only the precipitation of the α-Ti phase is facilitated, but also the Ti itself coated on the Nb-Ti rod becomes a pinning center. Therefore, the size, interval, arrangement, and the like of the pinning centers can be freely controlled at the wire rod design stage, as compared with the conventional method, and the Jc can be greatly improved.
次に実施例により本発明を更に詳細に説明する。 Next, the present invention will be described in more detail by way of examples.
実施例１〜２、比較例１ 外径45mm、内径38mmのCu管に、（１）Nb−46.5wt％Ti
鋳塊に100μｍ厚のTiシートを一重巻きしたもの（実施
例１）、（２）Nb−46.5wt％Ti鋳塊に100μｍ厚Tiシー
トを10重巻したもの（実施例２）をそれぞれ挿入して、
熱間押出しし、その後線径1.4mmまで引抜加工し、Cuを
硝酸で除去した。この線径1.4mmのTi/Nb−Ti合金棒をそ
れぞれCu管に620本ずつ挿入して再び熱間押出しした
後、引抜加工し線径2.5mmとした後、再び硝酸でCuを除
去した。この線径2.5mmのTi/Nb−Ti合金素線をそれぞれ
Cu管に320本ずつ挿入し、熱間押出し後、六角素線に引
抜加工した。この六角素線をそれぞれCu管に55本挿入し
て熱間押出しし、その後通常の中間熱処理と中間引抜加
工をそれぞれ４回施した後、最終加工として加工歪εｆ
＝4.5の引抜加工を施して線径0.28mmφのNb−Ti合金超
電導線を試作した。Examples 1 and 2 and Comparative Example 1 A Cu tube having an outer diameter of 45 mm and an inner diameter of 38 mm (1) Nb-46.5wt% Ti
A 100 μm-thick Ti sheet was single-wound around the ingot (Example 1), and (2) a 100 μm-thick Ti sheet was wound 10 times around the Nb-46.5 wt% Ti ingot (Example 2). hand,
Hot extrusion was performed, followed by drawing to a wire diameter of 1.4 mm, and Cu was removed with nitric acid. Each of the Ti / Nb-Ti alloy rods having a wire diameter of 1.4 mm was inserted into a Cu tube in an amount of 620, and then hot-extruded again. After the wire was drawn to a wire diameter of 2.5 mm, Cu was removed again with nitric acid. This 2.5 mm diameter Ti / Nb-Ti alloy strand was
After 320 pieces were inserted into a Cu tube, and after hot extrusion, they were drawn into hexagonal wires. Each of these 55 hexagonal wires is inserted into a Cu tube and hot-extruded, and then subjected to normal intermediate heat treatment and intermediate drawing four times each, followed by processing strain ε f as final processing.
= 4.5 was drawn to produce an Nb-Ti alloy superconducting wire with a wire diameter of 0.28 mmφ.
尚熱処理の条件は380℃40時間である。 The heat treatment was performed at 380 ° C. for 40 hours.
また比較例１として鋳塊にTiシートを巻かない以外は
実施例１と同様な方法で同様のNb−Ti合金超電導線を試
作した。Further, as Comparative Example 1, a similar Nb-Ti alloy superconducting wire was prototyped in the same manner as in Example 1 except that a Ti sheet was not wound around an ingot.
これらのNb−Ti合金超電導線について、5Tおよび8Tの
磁場下で臨界電流密度Jcを測定した。その結果を第１表
に示す。For these Nb-Ti alloy superconducting wires, the critical current density Jc was measured under magnetic fields of 5T and 8T. Table 1 shows the results.
第１表から明らかなように本発明によれば5Tおよび8T
のいずれの磁場においても臨界電流密度Jcが従来の方法
である比較例１の場合よりも優れたNb−Ti合金超電導線
が得られることがわかる。 As is evident from Table 1, according to the invention 5T and 8T
It can be seen that an Nb-Ti alloy superconducting wire having a better critical current density Jc than that of Comparative Example 1 which is a conventional method can be obtained in any magnetic field.
以上に説明した様に本発明によれば、比較的簡単な方
法により臨界電流密度の高い超電導線が得られ、工業上
顕著な効果を奏するものである。As described above, according to the present invention, a superconducting wire having a high critical current density can be obtained by a relatively simple method, and an industrially remarkable effect is achieved.
第１図は、本発明の製造方法の１実施態様を示す工程説
明図、第２図は、従来の製造方法を示す工程説明図であ
る。 １……Ti/Nb−Ti合金鋳塊、２……Cu又はCu合金管、3a
……Ti/Nb−Ti合金棒、4a、4b……素線、５……複合
線。FIG. 1 is a process explanatory view showing one embodiment of the manufacturing method of the present invention, and FIG. 2 is a process explanatory view showing a conventional manufacturing method. 1 ... Ti / Nb-Ti alloy ingot, 2 ... Cu or Cu alloy tube, 3a
...... Ti / Nb-Ti alloy rod, 4a, 4b ... strand, 5 ... composite wire.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−148517（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01B 12/10 H01B 13/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-148517 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H01B 12/10 H01B 13/00
Claims (1)
を束ねて、Cu又はCu合金管に挿入した後、これを複合加
工法により一体化したものを素線とし、該素線の複数本
を再びCu又はCu合金管に挿入した後、複合加工法により
一体化し、縮径する工程を所望回数繰り返す事を特徴と
するNb−Ti合金超電導線の製造方法。1. A method of bundling a plurality of Nb-Ti alloy rods coated with Ti on the surface, inserting the bundle into a Cu or Cu alloy tube, and unifying the bundles by a composite processing method into a strand. A method for manufacturing an Nb-Ti alloy superconducting wire, comprising repeating a desired number of times of inserting a plurality of wires again into a Cu or Cu alloy tube, integrating them by a composite working method, and reducing the diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2245056A JP3050580B2 (en) | 1990-09-14 | 1990-09-14 | Method for producing Nb-Ti alloy superconducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2245056A JP3050580B2 (en) | 1990-09-14 | 1990-09-14 | Method for producing Nb-Ti alloy superconducting wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04123717A JPH04123717A (en) | 1992-04-23 |
| JP3050580B2 true JP3050580B2 (en) | 2000-06-12 |
Family
ID=17127930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2245056A Expired - Lifetime JP3050580B2 (en) | 1990-09-14 | 1990-09-14 | Method for producing Nb-Ti alloy superconducting wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3050580B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5100459B2 (en) * | 2008-03-13 | 2012-12-19 | 株式会社神戸製鋼所 | NbTi superconducting wire and method for manufacturing the same |
| CN116475263B (en) * | 2023-06-25 | 2023-09-05 | 西安聚能超导线材科技有限公司 | Preparation method of distributed artificial pinning NbTi superconducting wire |
-
1990
- 1990-09-14 JP JP2245056A patent/JP3050580B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04123717A (en) | 1992-04-23 |
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