JP3350935B2 - Multi-core superconducting wire - Google Patents
Multi-core superconducting wireInfo
- Publication number
- JP3350935B2 JP3350935B2 JP05669891A JP5669891A JP3350935B2 JP 3350935 B2 JP3350935 B2 JP 3350935B2 JP 05669891 A JP05669891 A JP 05669891A JP 5669891 A JP5669891 A JP 5669891A JP 3350935 B2 JP3350935 B2 JP 3350935B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- superconducting
- superconducting wire
- thickness
- 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.)
- 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)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、酸化物高温超電導材
料を用いた多芯超電導線に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multifilamentary superconducting wire using an oxide high-temperature superconducting material.
【０００２】[0002]
【従来の技術】近年、より高い臨界温度を示す超電導材
料として、セラミックス系すなわち、酸化物系の超電導
体が注目されている。中でもイットリウム系が９０Ｋ、
ビスマス系が１１０Ｋ、タリウム系が１２０Ｋ程度の高
い臨界温度を有し、実用化が期待されている。2. Description of the Related Art In recent years, ceramic superconductors, that is, oxide superconductors, have attracted attention as superconducting materials exhibiting higher critical temperatures. Among them, yttrium is 90K,
Bismuth-based has a high critical temperature of about 110K and thallium-based has a high critical temperature of about 120K, and is expected to be put to practical use.
【０００３】これらの高温超電導材料は、ケーブル、ブ
スバー、パワーリードおよびコイルなどに応用すること
が考えられており、超電導線材の長尺化が検討されてい
る。また、従来の金属系および化合物系の超電導体と同
様に、これらの高温超電導体においても、多芯線を製造
することが検討されている。[0003] These high-temperature superconducting materials are considered to be applied to cables, bus bars, power leads, coils, and the like, and lengthening of superconducting wires is being studied. Also, as with conventional metal-based and compound-based superconductors, production of a multi-core wire is being studied for these high-temperature superconductors.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、酸化物
高温超電導材料を用いた多芯超電導線を、ケーブルおよ
びコイル等に応用しようとする場合、十分な曲げ特性が
得られないという問題があった。However, when a multifilamentary superconducting wire using an oxide high-temperature superconducting material is applied to a cable, a coil or the like, there is a problem that sufficient bending characteristics cannot be obtained.
【０００５】この発明の目的は、このような曲げ特性に
優れた酸化物超電導材料からなる多芯超電導線を提供す
ることにある。An object of the present invention is to provide a multifilamentary superconducting wire made of an oxide superconducting material having such excellent bending characteristics.
【０００６】[0006]
【課題を解決するための手段】この発明の多芯超電導線
は、ＢｉおよびＰｂを含む酸化物超電導材料からなる超
電導体部を安定化材中に複数配置した多芯超電導線であ
って、超電導体部となる原料を安定化材となる金属シー
スに充填し線材化した後、この線材の集合体を金属シー
ス中で束ねて線材化した超電導線であり、超電導体部の
個々の厚さが、線材全体の厚さの５％を上回りかつ１０
％以下であって、テープ状であることを特徴としてい
る。この発明の多芯超電導線の使用方法は、多芯超電導
線に与える歪み（ここで、歪みは、多芯超電導線の厚み
／曲げ直径で表される）を０．３％以下とすることを特
徴とする。A multifilamentary superconducting wire according to the present invention is a multifilamentary superconducting wire in which a plurality of superconducting portions made of an oxide superconducting material containing Bi and Pb are arranged in a stabilizing material. A superconducting wire in which a raw material to be a body part is filled in a metal sheath to be a stabilizing material and formed into a wire, and then an aggregate of the wires is bundled in a metal sheath to form a wire. More than 5% of the total thickness of the wire and 10
% Or less , and is characterized in that it is tape-shaped . The method of using the multifilamentary superconducting wire according to the present invention is characterized in that the strain applied to the multifilamentary superconducting wire (where the strain is represented by the thickness / bending diameter of the multifilamentary superconducting wire) is 0.3% or less. Features.
【０００７】この発明の多芯超電導線は、たとえば、酸
化物高温超電導体の粉末または前駆体の粉末を、銀など
の金属シースで被覆し、伸線加工により丸線を作り、さ
らにそれらを多数本集合して銀などの金属シースで被覆
し、伸線加工することにより得ることができる。必要に
応じて、その後圧延加工などの圧縮加工を施しテープ状
に加工したり、あるいは丸線の状態で熱処理・焼結して
もよい。The multifilamentary superconducting wire of the present invention comprises, for example, coating a powder of an oxide high-temperature superconductor or a powder of a precursor with a metal sheath of silver or the like, forming a round wire by wire drawing, and further forming a large number of such wires. The main assembly can be obtained by coating with a metal sheath such as silver and drawing. If necessary, it may be subjected to a compression process such as a rolling process to be processed into a tape shape, or may be heat-treated and sintered in a round wire state.
【０００８】[0008]
【発明の作用効果】超電導ケーブルおよびコイル、特に
超電導ケーブルでは、種々の工程や敷設の際に曲げ応力
を受ける。この発明の多芯超電導線では、超電導体部を
安定化材中に複数配置させたものであり、超電導体部の
個々の厚さが、線材全体の厚さの１０％以下である。こ
のため、曲げの応力を受けたときにも、超電導特性の劣
化が少ない。The superconducting cable and coil, especially the superconducting cable, are subjected to bending stress during various processes and laying. In the multifilamentary superconducting wire of the present invention, a plurality of superconductor portions are arranged in the stabilizing material, and the thickness of each superconductor portion is 10% or less of the thickness of the entire wire. For this reason, even when subjected to bending stress, deterioration of superconducting characteristics is small.
【０００９】この発明において、超電導体部の個々の厚
さを線材全体の厚さの１０％以下としているのは、１０
％を越えると所望の曲げ特性を得ることができないから
である。In the present invention, the reason why the individual thickness of the superconductor portion is set to 10% or less of the total thickness of the wire is that 10% or less.
%, The desired bending characteristics cannot be obtained.
【００１０】この発明の多芯超電導線は、素線となる金
属被覆された酸化物超電導体の線材を１回だけ集合して
多芯超電導線としている。このため、超電導体部間の距
離が線材内においてほぼ均一であり、良好な臨界電流密
度を得ることができる。[0010] The multifilamentary superconducting wire of the present invention is a multifilamentary superconducting wire formed by assembling a single wire of a metal-coated oxide superconductor as a strand. For this reason, the distance between the superconductor portions is substantially uniform in the wire, and a good critical current density can be obtained.
【００１１】線材を集合体として束ねる本数としては、
通常の寸法で、しかも酸化物超電導体の割合を金属被覆
に比べあまり小さくすることなく製作するためには、３
０本以上が必要である。The number of wires to be bundled as an aggregate is as follows:
In order to fabricate with normal dimensions and without making the proportion of the oxide superconductor much smaller than the metal coating, 3
Zero or more is required.
【００１２】さらに、この発明に従う多芯超電導線は、
種々の工程において、歪みを制御し、好ましくは０．３
％以下の歪み（歪み＝線の厚み／曲げ直径）を与える状
態で、巻取および繰出しなどの工程で使用することが好
ましい。Further, the multifilamentary superconducting wire according to the present invention comprises:
In various steps, the distortion is controlled, preferably 0.3
In a state where a strain of not more than% (strain = thickness of wire / bending diameter) is given, it is preferably used in a process such as winding and feeding.
【００１３】繰返し歪みを、０．３％以下の値に制御す
れば、超電導特性の劣化を防止することができる。When the repetitive strain is controlled to a value of 0.3% or less, deterioration of the superconducting characteristics can be prevented.
【００１４】この発明の多芯超電導線は、たとえばテー
プ状線材の形をしており、熱処理後繰出されて、リール
またはドラムなどに巻取り、ケーブルまたはコイルとし
て用いることができる。この巻取る際においてもまた種
々の用途で用いる場合においても、歪みは０．３％以下
にすることが好ましい。The multifilamentary superconducting wire of the present invention is in the form of, for example, a tape-shaped wire, and is unwound after heat treatment, wound around a reel or a drum, and used as a cable or a coil. It is preferable that the strain is not more than 0.3% at the time of winding and for various uses.
【００１５】この発明の多芯超電導線としては、金属被
覆されたものが、安定性の点から好ましい。金属の種類
としては、高温超電導体と反応せず、加工性が良好で安
定化材として機能するような比抵抗の小さなものがよ
く、たとえば銀および銀合金が用いられる。As the multifilamentary superconducting wire of the present invention, a metal-coated superconducting wire is preferable from the viewpoint of stability. As the kind of the metal, a metal having a small specific resistance that does not react with the high-temperature superconductor, has good workability, and functions as a stabilizing material is preferable. For example, silver and a silver alloy are used.
【００１６】これらの金属被覆層は、中間層として用い
られる場合もある。中間層として用いられる場合には、
その上に別の金属、たとえば銅やアルミニウムまたはそ
れらの合金がさらに被覆される。These metal coating layers may be used as an intermediate layer in some cases. When used as an intermediate layer,
Another metal, such as copper or aluminum or an alloy thereof, is further coated thereon.
【００１７】高温超電導体としては、たとえばイットリ
ウム系、ビスマス系、およびタリウム系のものが用いら
れる。臨界温度、臨界電流密度および毒性の少ないこと
ならびに希土類元素を必要としない点では、ビスマス系
の高温超電導体が好ましい。As the high-temperature superconductor, for example, yttrium-based, bismuth-based, and thallium-based superconductors are used. A bismuth-based high-temperature superconductor is preferred because it has low critical temperature, low critical current density, low toxicity, and does not require a rare earth element.
【００１８】この発明の多芯超電導線では、超電導体部
の個々の厚さが線材全体の厚さの１０％以下である。こ
のため、超電導体部を微細なフィラメントとして均一に
加工することができる。たとえば、超電導体部を５０か
ら数μｍ以下の微細なフィラメントにすることができ
る。このため、曲げ特性に優れた多芯超電導線とするこ
とができる。In the multifilamentary superconducting wire of the present invention, the individual thickness of the superconductor portion is not more than 10% of the thickness of the entire wire. Therefore, the superconductor portion can be uniformly processed as a fine filament. For example, the superconductor portion can be a fine filament of 50 to several μm or less. Therefore, a multi-core superconducting wire having excellent bending characteristics can be obtained.
【００１９】また、この発明では、線材の集合体を金属
シース中で束ねて線材化する工程を１回だけにしている
ので、超電導線内部では、超電導体部間の距離が均一で
あり、均一に加工することができる。Further, in the present invention, since the step of bundling the wire assembly in the metal sheath and making it into a wire is performed only once, the distance between the superconductor portions is uniform inside the superconducting wire, and the uniformity is obtained. Can be processed.
【００２０】[0020]
【実施例】実施例１ Ｂｉ：Ｐｂ：Ｓｒ：Ｃａ：Ｃｕ＝１．８４：０．３６：
０．９９：２．１８：３．００の組成を持つように、酸
化物または炭酸塩を混合した。この混合粉末を熱処理に
よって、超電導相として２２１２相が８５％、２２２３
相が１５％であり、（Ｃａ，Ｓｒ）2 ＰｂＯ4 およびＣ
ａ2 ＣｕＯ3 を主とする非超電導層からなる粉末を準備
した。この粉末を、１０ｔｏｒｒの減圧雰囲気で７００
℃、１２時間の脱ガス処理を行なった。EXAMPLES Example 1 Bi: Pb: Sr: Ca: Cu = 1.84: 0.36:
The oxide or carbonate was mixed to have a composition of 0.99: 2.18: 3.00. This mixed powder was subjected to heat treatment to make the superconducting phase 2212 phase 85%, 2223
(Ca, Sr) 2 PbO 4 and C
Powder composed of a non-superconducting layer mainly composed of a 2 CuO 3 was prepared. This powder was placed in a reduced pressure atmosphere of 10 torr for 700 hours.
A degassing treatment was performed at 12 ° C. for 12 hours.
【００２１】これらの粉末は、外径１２ｍｍ、内径９ｍ
ｍの銀パイプで被覆し、直径１．３ｍｍまで伸線加工し
た。この線材を６０本さらに外径１６．５ｍｍ、内径１
３．５ｍｍの銀パイプに入れて、直径１．０ｍｍまで伸
線加工した。その後、０．１７ｍｍの厚みで圧延加工し
た。These powders have an outer diameter of 12 mm and an inner diameter of 9 m
m, and wire-drawn to a diameter of 1.3 mm. 60 of these wires were further added with an outer diameter of 16.5 mm and an inner diameter of 1
It was placed in a 3.5 mm silver pipe and drawn to a diameter of 1.0 mm. Then, it was rolled to a thickness of 0.17 mm.
【００２２】この線材を、８４５℃、５５時間熱処理
し、その後１５％の加工度で圧延した。得られたテープ
状の線材を、外径５０ｍｍの円筒に巻付け、８４０℃、
５０時間熱処理した。This wire was heat-treated at 845 ° C. for 55 hours and then rolled at a working ratio of 15%. The obtained tape-shaped wire is wound around a cylinder having an outer diameter of 50 mm, at 840 ° C.
Heat treatment was performed for 50 hours.
【００２３】この後、この円筒から繰出し、直径５０ｍ
ｍのテフロンパイプにピッチ８０ｍｍで巻付けた。この
状態および半径１００ｍｍで曲げを２００回繰返した
後、液体窒素の下で臨界電流密度を測定した。液体窒素
の下での臨界電流密度は、いずれも安定しており、１
４，６００〜１５，７００Ａ／ｃｍ2 を示した。このよ
うに、この実施例の線材は、焼結後およびその後の曲げ
加工後においても、良好な特性を示した。Thereafter, the cylinder is unwound from the cylinder and has a diameter of 50 m.
m Teflon pipe at a pitch of 80 mm. After repeating this state and bending 200 times at a radius of 100 mm, the critical current density was measured under liquid nitrogen. The critical current densities under liquid nitrogen are all stable and 1
4,600 to 15,700 A / cm 2 . Thus, the wire rod of this example exhibited good characteristics even after sintering and after bending.
【００２４】実施例２ Ｂｉ：Ｐｂ：Ｓｒ：Ｃａ：Ｃｕ＝１．８０：０．３８：
２．００：１．９７：３．００の組成を持つように、酸
化物または炭酸塩を混合した。この混合粉末を、熱処理
により、超電導層としては２２１２相が８８％であり、
２２２３相が１２％であり、（Ｃａ，Ｓｒ）2 ＰｂＯ4
およびＣａ2 ＣｕＯ3 の非超電導層からなる粉末を準備
した。この粉末に対し、７ｔｏｒｒの減圧雰囲気で、７
００℃１８時間の脱ガス処理を行なった。Example 2 Bi: Pb: Sr: Ca: Cu = 1.80: 0.38:
The oxide or carbonate was mixed to have a composition of 2.00: 1.97: 3.00. By heat treatment of this mixed powder, the superconducting layer has a 2212 phase of 88%,
(Ca, Sr) 2 PbO 4
And a powder comprising a non-superconducting layer of Ca 2 CuO 3 . The powder was treated with a 7 torr
Degassing treatment was performed at 00 ° C. for 18 hours.
【００２５】この粉末を、実施例１と同様の工程で加工
して線材化し、線材を９０本集合させて多芯線を作製し
た。この多芯線を直径２ｍｍまで伸線し、０．２５ｍｍ
の厚みまで圧延加工した。この線材を８４５℃、４５時
間熱処理し、その後２２％の加工度で圧延した。このテ
ープ状の線材を８４０℃、５０時間熱処理した。This powder was processed in the same process as in Example 1 to form a wire, and 90 wires were assembled to produce a multifilamentary wire. This multi-core wire is drawn to a diameter of 2 mm, and 0.25 mm
Rolled to a thickness of This wire was heat-treated at 845 ° C. for 45 hours, and then rolled at a working ratio of 22%. This tape-shaped wire was heat-treated at 840 ° C. for 50 hours.
【００２６】得られた線材を、半径５０ｍｍの曲率で曲
げては直線状に戻す加工を２０回与えた。その後、液体
窒素の下で臨界電流密度を測定した。曲げ加工前および
後のいずれにおいても、液体窒素の下での臨界電流密度
は１２，０００〜１３，５００Ａ／ｃｍ2 の臨界電流密
度が得られた。The obtained wire was bent 20 times at a radius of curvature of 50 mm and returned to a straight line 20 times. Thereafter, the critical current density was measured under liquid nitrogen. Both before and after bending, a critical current density under liquid nitrogen of 12,000 to 13,500 A / cm 2 was obtained.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−104409（ＪＰ，Ａ) 特開 平１−105409（ＪＰ，Ａ) 特開 平１−169815（ＪＰ，Ａ) 特開 平１−134822（ＪＰ，Ａ) 特開 昭64−19617（ＪＰ，Ａ) 特開 平４−212212（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01B 12/00 - 13/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-104409 (JP, A) JP-A-1-105409 (JP, A) JP-A-1-169815 (JP, A) JP-A-1- 134822 (JP, A) JP-A-64-19617 (JP, A) JP-A-4-212212 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H01B 12/00-13 / 00
Claims (1)
からなる超電導体部を安定化材中に複数配置した多芯超
電導線であって、 前記超電導体部となる原料を前記安定化材となる金属シ
ースに充填し線材化し、この線材の集合体を金属シース
中で束ねて線材化した超電導線であり、前記超電導体部
の個々の厚さが、線材全体の厚さの５％を上回りかつ１
０％以下であって、テープ状である 多芯超電導線。1. A multi-core superconducting wire in which a plurality of superconducting portions made of an oxide superconducting material containing Bi and Pb are arranged in a stabilizing material, wherein a raw material for the superconducting portion is used as the stabilizing material. A superconducting wire formed by filling a metal sheath into a wire, and bundling the aggregate of the wires in the metal sheath to form a wire. The thickness of each superconductor portion exceeds 5% of the thickness of the entire wire and 1
A multi-core superconducting wire having a tape shape of 0% or less.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05669891A JP3350935B2 (en) | 1991-03-20 | 1991-03-20 | Multi-core superconducting wire |
| CA002063282A CA2063282C (en) | 1991-03-20 | 1992-03-18 | High temperature superconducting wire using oxide superconductive material |
| EP92104807A EP0504895B1 (en) | 1991-03-20 | 1992-03-19 | Superconducting wire using oxide superconductive material |
| DE69217681T DE69217681T2 (en) | 1991-03-20 | 1992-03-19 | Superconducting wire with superconducting oxide material |
| AU13053/92A AU654529B2 (en) | 1991-03-20 | 1992-03-19 | High temperature superconducting wire using oxide superconductive material |
| US08/479,898 US5869430A (en) | 1991-03-20 | 1995-06-07 | High temperature superconducting wire using oxide superconductive material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05669891A JP3350935B2 (en) | 1991-03-20 | 1991-03-20 | Multi-core superconducting wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04292809A JPH04292809A (en) | 1992-10-16 |
| JP3350935B2 true JP3350935B2 (en) | 2002-11-25 |
Family
ID=13034684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05669891A Expired - Lifetime JP3350935B2 (en) | 1991-03-20 | 1991-03-20 | Multi-core superconducting wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3350935B2 (en) |
-
1991
- 1991-03-20 JP JP05669891A patent/JP3350935B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04292809A (en) | 1992-10-16 |
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