JPH03216915A - Compound superconducting wire material - Google Patents
Compound superconducting wire materialInfo
- Publication number
- JPH03216915A JPH03216915A JP2012886A JP1288690A JPH03216915A JP H03216915 A JPH03216915 A JP H03216915A JP 2012886 A JP2012886 A JP 2012886A JP 1288690 A JP1288690 A JP 1288690A JP H03216915 A JPH03216915 A JP H03216915A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- wire
- hot extrusion
- superconducting
- sliver
- 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.)
- Pending
Links
- 150000001875 compounds Chemical class 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 title abstract description 7
- 239000000126 substance Substances 0.000 claims description 4
- 238000001192 hot extrusion Methods 0.000 abstract description 6
- 238000005491 wire drawing Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 229910000906 Bronze Inorganic materials 0.000 abstract description 4
- 238000000137 annealing Methods 0.000 abstract description 4
- 239000010974 bronze Substances 0.000 abstract description 4
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910000657 niobium-tin Inorganic materials 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000002887 superconductor Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- DOWVMJFBDGWVML-UHFFFAOYSA-N n-cyclohexyl-n-methyl-4-(1-oxidopyridin-1-ium-3-yl)imidazole-1-carboxamide Chemical compound C1=NC(C=2C=[N+]([O-])C=CC=2)=CN1C(=O)N(C)C1CCCCC1 DOWVMJFBDGWVML-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 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
Landscapes
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は超電導電磁石に使用する化合物８ｌ電導線材に
関し、特に臨界電流密度を向上させたものである．
〔従来の技術〕
現在超電導線材の実用化は盛んであるあるが、これをさ
らに進めるうえで線材に流しうる電流の大きさを高める
こと、即ち臨界電流密度Ｊ，を」一げることは１つの重
要な課題となっている．現在趙電導線材を電磁石として
使用する場合に上記の高Ｊ，化を図る１つの方法として
は、超電導線材のコイルにより発生する磁場内で該超電
導線材中に侵入する磁束を線材内で捕らえる方法がある
．なおこのように線材中に侵入する磁束を捕らえること
をピン止めといい、ビン止めの効果を有するものをピン
ニングセンターと呼んでいる．ところで、化合物超電導
線材におけるピンニングセンターは通常結晶粒界である
ことが知られている，ＮｂｓＳｎ線材では、Ｎｂコアあ
るいはマトリソクス中にＴａ，Ｔｉ，Ｈｆ，Ｇａなどを
添加して粒界をよりダーティにし、量子化された磁束を
対象として働く要素的ビンニングカを増大させ、Ｊｃを
向上させてきた．
〔発明が解決しようとする課題〕
上述のように、化合物超電導線において粒界をピンニン
グセンターとすると、ビンニングカＦＰは印加磁場Ｂと
の間にＦＰ ｏｃ（ｌ Ｂ／Ｂｃ）”の関係を有する
ことが知られている．ここでＢｃは臨界磁場である．従
って、印加磁場の強さが臨界磁場に近づくと、ビンニン
グカは象．激に小さくなり、Ｊｃは高磁場で減少すると
いう問題があった．〔課題を解決するための手段と作用
〕
本発明は上記問題点を解決した化合物超電導線材を提供
するもので、化合物超電導フィラメントを有する化合物
超電導線材において、線化合物超電導フィラメント内部
に非超電導物質からなるピンニングセンターを有するこ
とを特徴とするものである．
本発明は、化合物超電導フィラメント内に導入された非
８ｌ電導物質あるいは超電導物質であってもＨＣＸの差
があるものは押出し、伸線加工により引き伸ばされ、ピ
ンニングセンターとして有効に働き、要素的ビンニング
カを増加させて臨界磁場に近い高磁場においてＪ，を増
加させるという新しい知見に基づくものである．本発明
において前記非超電導物質としては、加工が容易なＣｕ
，Ｔａ等を用いるのが望ましい．
〔実施例〕
以下、実施例に基づいて本発明を説明する．第１図は本
発明にかかる化合物超電導線材の製造工程における断面
図を示し、径４０■の７−ｔ％のＴｉを含むＮｂＴｉビ
レット（１）に径２．ＯＭの穴を８５本あけ、それらの
穴の中にＴａ棒（２）を埋め込み、外側にＣｕシース（
３）をかぶせ、熱間押出しをおこない、伸線し、Ｃｕシ
ース（３）を除去して対面間隔２−の六角一次素線（４
）を製作した．次いで、外径４５閣、内径３３閣の１３
．５ｗｔ％のＳｎを含むブロンズビレット（５）の内側
に肉厚ｌ閣のＣｕバリア（６）を配したものに１９０本
の前記一次素線（４）を挿入し、真空引きの後６５０゜
Ｃにて熱間押出しをおこない、中間焼鈍と伸線工程を繰
り返して対面間隔２ｍの二次素綿（７）を製作した．さ
らに、外径６７閣、内径５０閣のブロンズビレット（８
）に３８０本の二次素線（７）を挿入し、熱間押出し、
中間焼鈍、伸線工程を繰返し、拡散熱処理を経て外径０
． １５−のＮ ｂ ｚ Ｓ ｎ超電導線材（９）を得
た．このようにして得られた超電導線材（９）のＮ ｂ
．Ｓ ｎフィラメント径は３−であり、フィラメント中
のＴａの体積比率は１７．５％であった．上記実施例の
サンプルと、上記実施例でＴａを含まない従来例のサン
プルを比較サンプルとして用意し印加磁場と臨界電流密
度の関係を測定し、その結果を第１表に示した．
第
ｌ
表
この結果より、Ｎｂ，Ｓｎフィラメント中にＴａを有す
る本実施例のサンプルは、Ｔａを含まない従来例に比較
して高いｊｃを有し、高磁場になるほどｊ，の従来例に
対する増加割合は大きくなり、高磁場における超電導特
性は格段に改善された．これはＴａがビン止め点として
有効であることを意味するものである．なお、本発明は
Ｎｂ３Ｓｎ以外のＡ１５型構造を有する化合物趙電導線
にも通用できることはいうまでもない。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a compound 8l conductive wire used in superconducting electromagnets, and in particular has improved critical current density. [Prior art] Superconducting wires are currently being put into practical use, but in order to further advance this, it is necessary to increase the magnitude of the current that can be passed through the wires, that is, to increase the critical current density J. This has become one of the most important issues. Currently, one method for achieving the above-mentioned high J when using a Zhao conducting wire as an electromagnet is to capture the magnetic flux that enters the superconducting wire within the magnetic field generated by the coil of the superconducting wire. be. Capturing the magnetic flux that enters the wire in this way is called pinning, and a device that has the effect of pinning is called a pinning center. By the way, it is known that the pinning centers in compound superconducting wires are usually grain boundaries.In NbsSn wires, Ta, Ti, Hf, Ga, etc. are added to the Nb core or matrix to make the grain boundaries dirtier. , the elemental binning force that acts on the quantized magnetic flux has been increased, and Jc has been improved. [Problem to be solved by the invention] As mentioned above, if grain boundaries are used as pinning centers in compound superconducting wires, the pinning force FP has a relationship with the applied magnetic field B of FP oc(l B/Bc). is known. Here, Bc is the critical magnetic field. Therefore, when the strength of the applied magnetic field approaches the critical magnetic field, the binning force becomes extremely small, and there is a problem that Jc decreases at high magnetic fields. [Means and effects for solving the problems] The present invention provides a compound superconducting wire that solves the above problems, and in which the compound superconducting wire has a compound superconducting filament, a non-superconducting substance is added to the inside of the compound superconducting filament. According to the present invention, non-8L conductive substances or superconducting substances introduced into a compound superconducting filament with a difference in HCX can be treated by extrusion or wire drawing. This is based on the new finding that the non-superconducting material is elongated and acts effectively as a pinning center, increasing the elemental binning force and increasing J in a high magnetic field close to the critical magnetic field.In the present invention, the non-superconducting material is Easy Cu
, Ta, etc. are preferably used. [Examples] The present invention will be explained below based on Examples. FIG. 1 shows a cross-sectional view of the manufacturing process of a compound superconducting wire according to the present invention. 85 holes were drilled in the OM, Ta rods (2) were embedded in these holes, and a Cu sheath (
3), hot extrusion, wire drawing, removing the Cu sheath (3), and forming a hexagonal primary wire (4) with a facing distance of 2−.
) was produced. Next, 13 of the outer diameters are 45 and the inner diameters are 33.
．． The 190 primary wires (4) were inserted into a bronze billet (5) containing 5 wt% Sn with a thick Cu barrier (6) placed inside it, and heated to 650°C after being evacuated. Hot extrusion was carried out at the same time, and intermediate annealing and wire drawing processes were repeated to produce secondary cotton (7) with a face-to-face distance of 2 m. In addition, a bronze billet with an outer diameter of 67 and an inner diameter of 50 (8
), 380 secondary strands (7) were inserted into the tube, hot extruded,
The intermediate annealing and wire drawing processes are repeated, and the outer diameter is reduced to 0 through diffusion heat treatment.
．． A 15-NbzSn superconducting wire (9) was obtained. Nb of the superconducting wire (9) thus obtained
．． The Sn filament diameter was 3-, and the volume ratio of Ta in the filament was 17.5%. The sample of the above example and the conventional sample of the above example which does not contain Ta were prepared as comparative samples, and the relationship between the applied magnetic field and the critical current density was measured, and the results are shown in Table 1. Table I From the results, the sample of this example with Ta in the Nb, Sn filament has a higher jc than the conventional example that does not contain Ta, and the higher the magnetic field, the more j increases compared to the conventional example. The ratio has increased, and the superconducting properties in high magnetic fields have been significantly improved. This means that Ta is effective as a stopper point. It goes without saying that the present invention can also be applied to conductive wires made of compounds having an A15 type structure other than Nb3Sn.
（発明の効果）
以上説明したように本発明によれば、化合物超電導フィ
ラメントはその内部に非超電導物質からなるピンニング
センターを有するため、臨界電流密度が増加し、特に高
磁場における０＝界ｉｉｔ流密度が著しく増加するとい
う優れた効果がある。(Effects of the Invention) As explained above, according to the present invention, since the compound superconducting filament has a pinning center made of a non-superconducting material inside thereof, the critical current density increases, especially in a high magnetic field. It has the excellent effect of significantly increasing density.
第１図は本発明にかかる化合物起電導線材の一実施例の
各製造工程における断面図である。FIG. 1 is a cross-sectional view of an embodiment of the compound electromotive conductive wire according to the present invention at various manufacturing steps.
Claims (1)
おいて、線化合物超電導フィラメント内部に非超電導物
質からなるピンニングセンターを有することを特徴とす
る化合物超電導線材。A compound superconducting wire having a compound superconducting filament, the compound superconducting wire having a pinning center made of a non-superconducting substance inside the compound superconducting filament.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012886A JPH03216915A (en) | 1990-01-23 | 1990-01-23 | Compound superconducting wire material |
| DE69022972T DE69022972T2 (en) | 1989-08-25 | 1990-05-28 | SUPRAL-CONDUCTIVE WIRE MATERIAL AND METHOD FOR PRODUCING IT. |
| CA002033325A CA2033325C (en) | 1989-08-25 | 1990-05-28 | Superconducting wire and method of manufacturing the same |
| PCT/JP1990/000680 WO1991003060A1 (en) | 1989-08-25 | 1990-05-28 | Superconductive wire material and method of producing the same |
| KR1019910700286A KR0158459B1 (en) | 1989-08-25 | 1990-05-28 | Superconductive wire material and method of producing the same |
| EP90907477A EP0440799B1 (en) | 1989-08-25 | 1990-05-28 | Superconductive wire material and method of producing the same |
| FI911966A FI103222B1 (en) | 1989-08-25 | 1991-04-23 | Superconducting conductor and method for manufacturing a superconducting conductor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012886A JPH03216915A (en) | 1990-01-23 | 1990-01-23 | Compound superconducting wire material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03216915A true JPH03216915A (en) | 1991-09-24 |
Family
ID=11817888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012886A Pending JPH03216915A (en) | 1989-08-25 | 1990-01-23 | Compound superconducting wire material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03216915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007027089A (en) * | 2005-07-19 | 2007-02-01 | Bruker Biospin Ag | Superconductive element containing copper inclusion, complex material, and manufacturing method of the same |
-
1990
- 1990-01-23 JP JP2012886A patent/JPH03216915A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007027089A (en) * | 2005-07-19 | 2007-02-01 | Bruker Biospin Ag | Superconductive element containing copper inclusion, complex material, and manufacturing method of the same |
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