JPH0664942B2 - Copper clad NbTi superconducting wire with NbTi barrier - Google Patents
Copper clad NbTi superconducting wire with NbTi barrierInfo
- Publication number
- JPH0664942B2 JPH0664942B2 JP4006351A JP635192A JPH0664942B2 JP H0664942 B2 JPH0664942 B2 JP H0664942B2 JP 4006351 A JP4006351 A JP 4006351A JP 635192 A JP635192 A JP 635192A JP H0664942 B2 JPH0664942 B2 JP H0664942B2
- Authority
- JP
- Japan
- Prior art keywords
- nbti
- barrier
- copper
- superconducting wire
- wire
- 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
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)
- Wire Processing (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、銅被覆ＮbＴi超電導線
に関し、更に詳しくは、銅被覆ＮbＴi超電導極細多芯線
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper-coated NbTi superconducting wire, and more particularly to a copper-coated NbTi superconducting ultrafine multifilamentary wire.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】従
来、銅パイプを嵌合した多数のＮbＴi合金棒を銅ビレッ
ト中に挿入複合化し、熱間押出しによって縮径し、次い
でダイスを通して伸線加工を行うことによって数千本の
ＮbＴi合金フィラメントを有する超電導極細多芯線を製
造していた。しかし、この超電導極細多芯線には、Ｉc
の低下および永久電流モ−ドで使用時に電流の減衰を生
じるという欠点がある。熱間押出しのための昇温および
押出し時の加工発熱のためにＮbＴi合金と銅の金属間化
合物(例えば、Ｔi2Ｃu、(ＴiＮb)2Ｃu)の層が形成さ
れ、この層はＮbＴi合金フィラメントより硬く、伸線加
工時においてＮbＴi合金フィラメントにくい込み、Ｎb
Ｔi合金フィラメントの多数の断線を生じさせるからで
ある。2. Description of the Related Art Conventionally, a large number of NbTi alloy rods fitted with copper pipes are inserted into a copper billet to form a composite, which is hot extruded to reduce the diameter and then drawn through a die. By doing so, a superconducting ultrafine multifilamentary wire having thousands of NbTi alloy filaments was produced. However, this superconducting ultra-fine multi-core wire is
And a permanent current mode which results in current decay during use. A layer of an NbTi alloy and an intermetallic compound of copper (for example, Ti 2 Cu, (TiNb) 2 Cu) is formed due to the temperature rise for hot extrusion and the heat generation during extrusion, and this layer is a NbTi alloy filament. Harder, NbTi alloy filament is difficult to draw during wire drawing, Nb
This is because many breakages of the Ti alloy filament occur.
【０００３】[0003]
【課題を解決するための手段】本発明者らは、銅被覆Ｎ
bＴi超電導線を鋭意研究の結果、予めＮbＴi合金棒表面
にＮbＴiバリアを被覆するとＮbＴi合金フィラメントの
断線がほとんどないことを見い出し、本発明を完成する
に至った。The present inventors have found that the copper coating N
As a result of earnest research on the bTi superconducting wire, it was found that if the surface of the NbTi alloy rod was previously coated with the NbTi barrier, there was almost no breakage of the NbTi alloy filament, and the present invention was completed.
【０００４】本発明の要旨は、ＮbＴi合金棒の表面にＮ
bＴiのバリアを被覆し、ＮbＴiフィラメント径が２〜３
０μm、ＮbＴiバリア厚が０.１〜２μm、ＮbＴiバリア
のＴi濃度が３０重量％以下であることを特徴とする銅
被覆ＮbＴi超電導線に存する。The gist of the present invention is that the NbTi alloy rod has N
It covers the barrier of bTi and the diameter of NbTi filament is 2-3.
The present invention resides in a copper-coated NbTi superconducting wire characterized by having a thickness of 0 μm, an NbTi barrier thickness of 0.1 to 2 μm, and a Ti concentration of the NbTi barrier of 30% by weight or less.
【０００５】本発明の超電導極細多芯線の製造手順を以
下に詳しく述べる。 (１)ＮbＴi合金棒の表面に ＮbＴiのバリアを被覆する。
この工程が本発明の超電導線の特徴である。この段階で
ＮbＴi合金棒の直径は数mm〜数１０mm、ＮbＴiバリア厚
は数１００μm程度である。以後の工程は従来法と全く
同じである。 (２)このＮbＴi合金棒と銅パイプまたは銅合金(例え
ば、Ｃu−Ｎi合金)パイプを嵌合し、多数の嵌合物を銅
ビレット中に挿入する。 (３)ビレットを熱間押出しによって縮径し、次いでダイ
スを通して伸線加工する。The manufacturing procedure of the superconducting ultrafine multifilamentary wire of the present invention will be described in detail below. (1) The surface of the NbTi alloy rod is coated with a NbTi barrier.
This step is a feature of the superconducting wire of the present invention. At this stage, the diameter of the NbTi alloy rod is several millimeters to several tens of millimeters, and the NbTi barrier thickness is about several 100 μm. The subsequent steps are exactly the same as the conventional method. (2) The NbTi alloy rod and a copper pipe or a copper alloy (for example, Cu-Ni alloy) pipe are fitted to each other, and a large number of fittings are inserted into a copper billet. (3) The billet is reduced in diameter by hot extrusion and then drawn through a die.
【０００６】通常用いられるＮbＴi合金棒はＴi 含量４
０〜６０重量％であり、この合金は銅と金属間化合物を
作り易い。バリアとして用いられるＮbＴiはかなりの高
温(例えば７００℃)においても銅と金属間化合物を作り
にくい。被覆するバリアの厚さは押出しおよび伸線条件
によって異なるが最終寸法で1μm程度が好ましい。バリ
ア中のＴｉ濃度は０.０１重量％以上であることが好ま
しい。A commonly used NbTi alloy rod has a Ti content of 4
It is 0 to 60% by weight, and this alloy easily forms an intermetallic compound with copper. NbTi used as a barrier is difficult to form an intermetallic compound with copper even at a considerably high temperature (for example, 700 ° C.). The thickness of the barrier to be coated varies depending on the extrusion and wire drawing conditions, but the final dimension is preferably about 1 μm. The Ti concentration in the barrier is preferably 0.01% by weight or more.
【０００７】[0007]
【発明の効果】本発明の超電導線の特長は、ＮbＴi合金
フィラメントの断線がほとんどなく、超電導特性に優れ
ていることである。熱間押出時の高温の場合にもバリア
によってＮbＴi合金と銅の拡散を防止するので、ＮbＴi
合金と銅の金属間化合物の形成がないからである。The advantage of the superconducting wire of the present invention is that the NbTi alloy filament has almost no breakage and has excellent superconducting properties. The barrier prevents the NbTi alloy and copper from diffusing even at high temperatures during hot extrusion, so NbTi
This is because there is no formation of an intermetallic compound between the alloy and copper.
【０００８】本発明の超電導線の別の特長は、製造コス
トを低減できることである。高温にしても断線の原因と
なる障害が生じないので熱間押出し温度を高くでき、そ
のため熱間押出しの加工度を大きくできる(大きく減面
できる)からである。また本発明の他の特長として、高
い臨界電流密度がある。ＮbＴiバリアを適切な厚みで配
置することによって、加工途中の熱処理回数を従来の１
〜３回から４〜１０回程度まで増加することができる。
熱処理回数が多い程、臨界電流密度が高くなる事が知ら
れており、本発明はこの点でも工業的に有利である。Another feature of the superconducting wire of the present invention is that the manufacturing cost can be reduced. This is because the hot extrusion temperature can be increased because the trouble that causes the wire breakage does not occur even at a high temperature, and thus the workability of the hot extrusion can be increased (the surface can be greatly reduced). Another feature of the present invention is high critical current density. By arranging the NbTi barrier with an appropriate thickness, the number of heat treatments during processing can be reduced to 1
It can be increased from 3 to 4 to 10 times.
It is known that the higher the number of heat treatments, the higher the critical current density, and the present invention is industrially advantageous in this respect as well.
【０００９】本発明の超電導線は、永久電流モ−ドで用
いられる磁気浮上用超電導磁石およびＮＭＲ−ＣＴ用超
電導磁石等に特に有用である。The superconducting wire of the present invention is particularly useful for a magnetic levitation superconducting magnet and an NMR-CT superconducting magnet used in a permanent current mode.
【００１０】[0010]
【実施例】以下に実施例および比較例を示し、本発明を
更に詳しく説明する。 実施例１〜４ならびに比較例１ 径３mmのＮbＴi合金棒表面に厚さ２００μmのＴi濃度を
変えた５種類のシート状のＮbＴiバリアを被覆し、外径
６mmの銅パイプと嵌合し、５００本の嵌合物を外径１６
cmの銅ビレット中に挿入して電子ビームでふたをした。
温度６００℃で３０００トンの熱間押出しによってビレ
ットの径を５０mmにした。次いでダイスによってＮbＴi
合金フィラメントが３４〜１.３μmの範囲になるように
伸線した線材を製作した。このときのＮbＴiバリア厚み
は２.３〜０.０８μmになっていた。これらの線材を５
０cmの長さでサンプリングし、被覆された銅を硝酸で溶
解してフィラメント５００本のうちの断線数を計測し
た。同時に０.４mm径の５種の線材の臨界電流密度を５
Ｔ, ４.２Ｋで測定した。EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. Examples 1 to 4 and Comparative Example 1 The surface of a NbTi alloy rod having a diameter of 3 mm was coated with five kinds of sheet-shaped NbTi barriers having a Ti concentration of 200 μm and changed, and fitted with a copper pipe having an outer diameter of 6 mm, and 500 The outer diameter of the mating object is 16
It was inserted into a cm billet and covered with an electron beam.
The billet diameter was reduced to 50 mm by hot extruding 3000 tons at a temperature of 600 ° C. Then NbTi with a die
A wire rod was produced so that the alloy filament was in the range of 34 to 1.3 μm. At this time, the NbTi barrier thickness was 2.3 to 0.08 μm. 5 of these wires
The sample was sampled at a length of 0 cm, the coated copper was dissolved in nitric acid, and the number of breaks in 500 filaments was measured. At the same time, the critical current densities of 5 types of wire with 0.4 mm diameter are
It was measured at T, 4.2K.
【００１１】比較例２ ＮbＴi合金棒表面にバリアを設けない以外は上記手順を
繰り返し、フィラメント断線数と臨界電流密度を計測し
た。これらの結果を表１、表２および図１に示す。Comparative Example 2 The above procedure was repeated except that no barrier was provided on the surface of the NbTi alloy rod, and the number of filament breakages and the critical current density were measured. The results are shown in Tables 1 and 2 and FIG.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】フィラメント断線率の結果（図１）から、
ＮbＴiバリアのＴi濃度が３０重量％を超えると断線率
が大幅に増加することが判る。Ｔi濃度は最も低い０.７
重量％のものが断線率が最も低いが、３０重量％以下で
あれば実用に適することが明らかである。また表１、表
２の結果よりＮbＴiフィラメント径としては３０〜２μ
mのものが、臨界電流密度２０００Ａ／mm2を超えてお
り、実用可能である。ＮbＴiバリア厚としても２〜０.
１μmの範囲が、フィラメント断線率、臨界電流密度の
点から好ましいことがわかる。From the result of the filament breakage ratio (FIG. 1),
It can be seen that if the Ti concentration of the NbTi barrier exceeds 30% by weight, the wire breakage rate greatly increases. The lowest Ti concentration is 0.7
The wire breakage ratio is the lowest in the case of weight%, but it is apparent that it is suitable for practical use in the case of 30 weight% or less. From the results shown in Tables 1 and 2, the NbTi filament diameter is 30 to 2 μm.
The m-those having a critical current density of more than 2000 A / mm 2 are practical. The NbTi barrier thickness is 2-0.
It can be seen that the range of 1 μm is preferable in terms of the filament breakage rate and the critical current density.
【図１】 フィラメント径およびバリア厚とフィラメン
ト断線率の関係を示すグラフである。FIG. 1 is a graph showing a relationship between a filament diameter and a barrier thickness and a filament breakage rate.
１…実施例１、 ２…実施例２、 ３…実施例３、
４…実施例４、 ５…比較例１、 ６…比較例２。1 ... Example 1, 2 ... Example 2, 3 ... Example 3,
4 ... Example 4, 5 ... Comparative example 1, 6 ... Comparative example 2.
Claims (1)
被覆し、ＮbＴiフィラメント径が２〜３０μm、ＮbＴi
バリア厚が０.１〜２μm、ＮbＴiバリアのＴi濃度が３
０重量％以下であることを特徴とする銅被覆ＮbＴi超電
導線。1. A surface of an NbTi alloy rod is coated with a barrier of NbTi, and the diameter of the NbTi filament is 2 to 30 μm.
Barrier thickness is 0.1 to 2 μm, Ti concentration of NbTi barrier is 3
A copper-coated NbTi superconducting wire characterized by being 0% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4006351A JPH0664942B2 (en) | 1984-02-14 | 1992-01-17 | Copper clad NbTi superconducting wire with NbTi barrier |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59026772A JPH063690B2 (en) | 1984-02-14 | 1984-02-14 | Copper-coated ΝbTi superconducting wire |
| JP4006351A JPH0664942B2 (en) | 1984-02-14 | 1992-01-17 | Copper clad NbTi superconducting wire with NbTi barrier |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59026772A Division JPH063690B2 (en) | 1984-02-14 | 1984-02-14 | Copper-coated ΝbTi superconducting wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0554730A JPH0554730A (en) | 1993-03-05 |
| JPH0664942B2 true JPH0664942B2 (en) | 1994-08-22 |
Family
ID=26340466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4006351A Expired - Lifetime JPH0664942B2 (en) | 1984-02-14 | 1992-01-17 | Copper clad NbTi superconducting wire with NbTi barrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0664942B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4044457A (en) | 1976-04-01 | 1977-08-30 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method of fabricating composite superconducting wire |
-
1992
- 1992-01-17 JP JP4006351A patent/JPH0664942B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4044457A (en) | 1976-04-01 | 1977-08-30 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method of fabricating composite superconducting wire |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0554730A (en) | 1993-03-05 |
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