JPH07169342A - Multi-filament oxide superconducting wire - Google Patents
Multi-filament oxide superconducting wireInfo
- Publication number
- JPH07169342A JPH07169342A JP5313456A JP31345693A JPH07169342A JP H07169342 A JPH07169342 A JP H07169342A JP 5313456 A JP5313456 A JP 5313456A JP 31345693 A JP31345693 A JP 31345693A JP H07169342 A JPH07169342 A JP H07169342A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting wire
- oxide superconducting
- filament
- alloy
- layer
- 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
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
【０００１】[0001]
【産業上の利用分野】本発明は電力ケーブル、マグネッ
ト等に適用可能な酸化物超電導線材に関し、主として交
流用に適した多芯酸化物超電導線材に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxide superconducting wire applicable to power cables, magnets and the like, and more particularly to a multi-core oxide superconducting wire suitable for alternating current.
【０００２】[0002]
【従来の技術】Ｙ系、Ｂｉ系、Ｔｌ系に代表される臨界
温度が液体窒素温度を越えるいわゆる酸化物超電導体
（以下超電導体と記す）を線材化、導体化して、マグネ
ット、コイル等種々の電力応用導体として使用する試み
がなされている。2. Description of the Related Art So-called oxide superconductors (hereinafter referred to as superconductors) whose critical temperature exceeds the liquid nitrogen temperature, represented by Y-type, Bi-type, and Tl-type, are made into wire rods and conductors, and various magnets, coils, etc. Attempts have been made to use it as an electric power application conductor.
【０００３】従来の酸化物超電導線材（以下超電導線材
と記す。）は、酸化物超電導材料からなるフィラメント
の外周がＡｇ、Ｃｕ等の安定化材層により被覆されてい
る。前記安定化材層は、通電中のフィラメントにおきる
磁束の急激な移動であるフラックス・ジャンプに起因し
た発熱に対してヒートシンクの作用をしたり、電流のバ
イパスとしての作用をなすものである。このような超電
導線材を作製する方法としては一般に金属シース法が用
いられている。この方法は、安定化材として好適なＡｇ
等からなるパイプ内に、超電導体またはその前駆物質を
充填する。ついで前記パイプに断面を減少させる加工を
施して超電導体またはその前駆物質の外周に安定化材層
が形成されたビレットとなす。しかる後このビレットに
所定の熱処理を施して超電導線材とするものである。こ
のような超電導線材を電力ケーブル用、コイル用、電流
リード用等の導体として使用する場合、曲げ等の機械的
な歪みが導体に加わるため、その改善を目的として図２
に示すような超電導線材の多芯化が図られている。In a conventional oxide superconducting wire (hereinafter referred to as a superconducting wire), a filament made of an oxide superconducting material has an outer periphery covered with a stabilizing material layer such as Ag or Cu. The stabilizing material layer functions as a heat sink for heat generation due to a flux jump, which is a rapid movement of a magnetic flux generated in a filament during energization, and as a current bypass. A metal sheath method is generally used as a method for producing such a superconducting wire. This method is suitable for stabilizing Ag.
A superconductor or its precursor is filled in a pipe made of, for example. Next, the pipe is processed to reduce its cross section to obtain a billet having a stabilizing material layer formed on the outer periphery of the superconductor or its precursor. Thereafter, the billet is subjected to a predetermined heat treatment to obtain a superconducting wire. When such a superconducting wire is used as a conductor for a power cable, a coil, a current lead, etc., mechanical strain such as bending is added to the conductor.
The superconducting wire rod has a multi-core structure as shown in FIG.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら多芯酸化
物超電導線材は、曲げ特性には優れた線材であるが、交
流用としては適していない。例えばケーブルとして使用
する場合では、フィラメント１に交流を通電すると、外
部磁場が変動し磁束が出入りする過程で、フィラメント
１間に安定化材層３を介して結合電流が流れる。このと
きに発生するジュール損を結合損失（Ｐｃ）と呼んでお
り、Ｐｃは一般に、 Ｐｃ＝Ｂ2 （２πｆ）2 τ／μ0 τ＝（１／２）（μ／ρ）（ｌ0 ／２π）2 （Ｂ：外部磁場、ｆ：周波数、τ：磁束が超電導体に侵
入する時定数、μ0 ：真空の透磁率、ρ：超電導体間横
断抵抗率、ｌ0 ：ツイストピッチ）で求めることができ
る。このような結合損失のために液体窒素等の冷媒の蒸
発量が多くなったり、それに伴ってフィラメント１がク
エンチするなどの問題がある。However, although the multi-core oxide superconducting wire is a wire excellent in bending characteristics, it is not suitable for alternating current. For example, when used as a cable, when an alternating current is applied to the filament 1, a coupling current flows between the filaments 1 through the stabilizing material layer 3 in the process of changing the external magnetic field and flowing in and out of the magnetic flux. The Joule loss generated at this time is called a coupling loss (Pc), and Pc is generally Pc = B 2 (2πf) 2 τ / μ 0 τ = (1/2) (μ / ρ) (l 0 / 2π) 2 (B: external magnetic field, f: frequency, τ: time constant of magnetic flux penetrating into superconductor, μ 0 : permeability of vacuum, ρ: cross resistance between superconductors, l 0 : twist pitch) be able to. Due to such a coupling loss, there is a problem that the evaporation amount of the refrigerant such as liquid nitrogen increases and the filament 1 is quenched accordingly.
【０００５】本発明は上記従来技術の問題点に鑑み鋭意
検討の結果なされたもので、その目的とするところは、
交流用として好適な多芯酸化物超電導線材を提供するこ
とにある。The present invention has been made as a result of extensive studies in view of the above problems of the prior art.
It is to provide a multi-core oxide superconducting wire suitable for alternating current.
【０００６】[0006]
【課題を解決するための手段】本発明では、酸化物超電
導材料からなるフィラメント１を安定化材層３中に複数
配置した多芯酸化物超電導線材であり、前記フィラメン
ト１と安定化材層３との間にＡｇ−Ａｌ合金またはＡｇ
−Ｍｇ合金からなる層２が設けられている多芯酸化物超
電導線材により前記課題の解決を図った。According to the present invention, there is provided a multi-core oxide superconducting wire in which a plurality of filaments 1 made of an oxide superconducting material are arranged in a stabilizing material layer 3, and the filament 1 and the stabilizing material layer 3 are provided. Between Ag-Al alloy or Ag
The multi-core oxide superconducting wire provided with the layer 2 made of —Mg alloy is intended to solve the above problems.
【０００７】前記安定化材層３としては、熱伝導性、電
気伝導性に優れた材料であるＡｇ、Ｃｕの他、Ａｕ、Ｐ
ｄ、Ｉｒ、Ｒｈ等が好適に使用できるが、酸素透過性、
耐酸化性の点でＡｇがより好適に使用できる。The stabilizing material layer 3 includes Au and P in addition to Ag and Cu, which are materials having excellent thermal conductivity and electrical conductivity.
d, Ir, Rh and the like can be preferably used, but oxygen permeability,
Ag is more preferably used in terms of oxidation resistance.
【０００８】本発明の多芯酸化物超電導線材（以下多芯
超電導線材と記す。）の長手方向に直交する断面は特に
限定はなく、円形、あるいはテープ状、多角形等とする
ことができ、臨界電流密度を向上させるために断面をテ
ープ状にするのが好ましい。The cross section of the multifilamentary oxide superconducting wire of the present invention (hereinafter referred to as multifilamentary superconducting wire) orthogonal to the longitudinal direction is not particularly limited, and may be circular, tape-shaped, polygonal, or the like. In order to improve the critical current density, it is preferable to taper the cross section.
【０００９】また本発明の多芯超電導線材には、線材の
長手方向にねじり（ツイスト）を与える加工（以下ツイ
スト加工と記す。）が施されているのが好ましい。多芯
超電導線材に交流磁界が加わった場合に、結合電流によ
る結合損失が生じるのを低減するためである。Further, it is preferable that the multifilamentary superconducting wire of the present invention is processed to give a twist in the longitudinal direction of the wire (hereinafter referred to as "twisting"). This is to reduce the occurrence of coupling loss due to the coupling current when an AC magnetic field is applied to the multi-core superconducting wire.
【００１０】[0010]
【作用】本発明の多芯酸化物超電導線材は、フィラメン
ト１と安定化材層３との間に、前記安定化材層３に比し
て高抵抗のＡｇ−Ａｌ合金層２またはＡｇ−Ｍｇ合金層
２が設けられている。よって、フィラメント１間の横断
抵抗率が大きくなるので、交流通電時にフィラメント１
間に結合電流が流れるのを遮断して結合損失を低減する
ことができる。The multi-core oxide superconducting wire of the present invention has the Ag-Al alloy layer 2 or Ag-Mg between the filament 1 and the stabilizing material layer 3 which has a higher resistance than the stabilizing material layer 3. The alloy layer 2 is provided. Therefore, the transverse resistance between the filaments 1 is increased, and the filaments 1 are not energized when an alternating current is applied.
The coupling loss can be reduced by blocking the flow of the coupling current between them.
【００１１】[0011]
【実施例】以下、本発明を実施例に基づいて詳しく説明
する。 （実施例１）Ｂｉ2 Ｏ3 、ＰｂＯ、ＳｒＣＯ3 、ＣａＣ
Ｏ3 、及びＣｕＯの粉末をモル比でＢｉ：Ｐｂ：Ｓｒ：
Ｃａ：Ｃｕ＝１．６：０．４：２：２：３となるように
配合、混合した混合粉を大気中で８００℃、８０時間仮
焼した後粉砕し、前駆物質とする。ついでこの前駆物質
を外径が２０ｍｍ、内径が１５ｍｍであるＡｇ９２ｍｏ
ｌ％、Ａｌ８ｍｏｌ％合金からなるパイプ内に充填す
る。ついでこの合金製パイプを外径が２５ｍｍ、内径が
２０．４ｍｍであるＡｇ製パイプ内に挿入する。ついで
このＡｇ製パイプを静水圧押出しして外径８ｍｍに仕上
げ、さらに引き抜き加工を施して外径３ｍｍの一次ビレ
ットとする。このようにして得られる一次ビレットを３
７本束ね、外径２５ｍｍ、内径２１ｍｍのＡｇ製パイプ
内に挿入する。ついでこの一次ビレットを挿入したＡｇ
製パイプを静水圧押出しして外径８ｍｍとし、さらに引
き抜き加工を施して外径１ｍｍの二次ビレットとする。
得られた二次ビレットにピッチが３ｍｍとなるようにツ
イスト加工と圧延加工を施す。ついでこの二次ビレット
に大気中で８３５℃、５０時間の熱処理を２回繰り返し
て施し、図１に示すような厚さ０．２５ｍｍ、幅約２ｍ
ｍの多芯超電導線材を得る。EXAMPLES The present invention will be described in detail below based on examples. (Example 1) Bi 2 O 3, PbO , SrCO 3, CaC
O 3 and CuO powders were mixed at a molar ratio of Bi: Pb: Sr:
The mixed powder mixed and mixed so that Ca: Cu = 1.6: 0.4: 2: 2: 3 is calcined in the air at 800 ° C. for 80 hours and then pulverized to obtain a precursor. This precursor is then Ag92mo with an outer diameter of 20 mm and an inner diameter of 15 mm.
It is filled in a pipe made of 1% and Al 8 mol% alloy. Then, this alloy pipe is inserted into an Ag pipe having an outer diameter of 25 mm and an inner diameter of 20.4 mm. Next, this Ag pipe is hydrostatically extruded to have an outer diameter of 8 mm and further drawn to obtain a primary billet having an outer diameter of 3 mm. 3 primary billets obtained in this way
7 bundles are inserted into an Ag pipe having an outer diameter of 25 mm and an inner diameter of 21 mm. Then Ag with this primary billet inserted
The pipe is hydrostatically extruded to have an outer diameter of 8 mm, and further drawn to obtain a secondary billet having an outer diameter of 1 mm.
The obtained secondary billet is twisted and rolled so that the pitch becomes 3 mm. Then, this secondary billet was repeatedly subjected to heat treatment at 835 ° C. for 50 hours in the atmosphere twice, and the thickness was 0.25 mm and the width was about 2 m as shown in FIG.
A multifilamentary superconducting wire of m is obtained.
【００１２】このようにして得られた多芯超電導線材の
横断面形状の観察と分析を行った結果、フィラメント１
とＡｇ−Ａｌ合金層２との反応は見られなかった。この
多芯超電導線材の全交流損失を測定するために、外径１
８ｍｍのステンレス（ＳＵＳ）製パイプにピッチが約２
５０ｍｍとなるように多芯超電導線材を螺旋状に巻き付
けたものを作製した。ここで１層当たりの線材数は２５
〜２６本で計３層巻き付けた。このような多芯超電導線
材の全交流損失（ヒステリシス損失、結合損失、渦電流
損失）を蒸発法により測定した。As a result of observing and analyzing the cross-sectional shape of the multifilamentary superconducting wire thus obtained, filament 1
No reaction was observed with the Ag—Al alloy layer 2. To measure the total AC loss of this multifilamentary superconducting wire, the outer diameter 1
8mm stainless (SUS) pipe with a pitch of about 2
A spirally wound multifilamentary superconducting wire having a length of 50 mm was produced. Here, the number of wire rods per layer is 25
A total of 3 layers were wound with ~ 26 pieces. The total AC loss (hysteresis loss, coupling loss, eddy current loss) of such a multicore superconducting wire was measured by the evaporation method.
【００１３】（蒸発法） （１）真空断熱あるいはスーパーインシュレーション等
が施されている液体窒素容器内に線材を挿入する。そし
てこの容器を流量計に接続し全体を密閉状態にして測定
装置とする。 （２）線材に交流５００Ａを通電して窒素の蒸発量（ｌ
／ｍｉｎ）を測定する。 （３）つぎに線材を挿入しないで蒸発量（外部からの熱
侵入）を測定し、（２）で測定した値から差し引く。 （４）このようにして求められた蒸発量から発熱量、す
なわち全交流損失が求められる。(Evaporation Method) (1) Insert the wire into a liquid nitrogen container that is vacuum-insulated or super-insulated. Then, this container is connected to a flow meter and the whole is hermetically sealed to form a measuring device. (2) Amount of nitrogen evaporation (l
/ Min) is measured. (3) Next, measure the amount of evaporation (heat intrusion from the outside) without inserting the wire rod, and subtract it from the value measured in (2). (4) The calorific value, that is, the total AC loss is obtained from the evaporation amount thus obtained.
【００１４】その結果、１．９ｋＷ／ｍ3 の優れた値が
得られた。なお蒸発法により測定した値（ｋＷ／ｍ3 ）
は小さいほど交流損失、中でも結合損失が少ないことを
示す。As a result, an excellent value of 1.9 kW / m 3 was obtained. The value measured by the evaporation method (kW / m 3 )
Indicates that the smaller the value, the smaller the AC loss, and the less the coupling loss.
【００１５】（実施例２）実施例１のＡｇ−Ａｌ合金製
パイプに換えてＡｇ９５ｍｏｌ％、Ｍｇ５ｍｏｌ％合金
からなるパイプを用いる。それ以外は実施例１と同様に
して多芯超電導線材を作製した。得られた多芯超電導線
材の横断面形状の観察と分析を行った結果、フィラメン
ト１とＡｇ−Ｍｇ合金層２との反応は見られなかった。
この多芯超電導線材の全交流損失を実施例１と同様にし
て測定したところ、１．４ｋＷ／ｍ3 と優れた値が得ら
れた。(Example 2) Instead of the Ag-Al alloy pipe of Example 1, a pipe made of an alloy of 95 mol% Ag and 5 mol% Mg is used. A multifilamentary superconducting wire was produced in the same manner as in Example 1 except for the above. As a result of observing and analyzing the cross-sectional shape of the obtained multifilamentary superconducting wire, no reaction between the filament 1 and the Ag-Mg alloy layer 2 was observed.
When the total AC loss of this multifilamentary superconducting wire was measured in the same manner as in Example 1, an excellent value of 1.4 kW / m 3 was obtained.
【００１６】（比較例１）実施例１のＡｇ−Ａｌ合金製
パイプに換えてＡｇ製のパイプを用いた以外は実施例１
と同様にして多芯超電導線材を作製した。得られた多芯
超電導線材の全交流損失を実施例と同様にして測定した
ところ、１８ｋＷ／ｍ3 と実施例に比して極めて劣るも
のであった。(Comparative Example 1) Example 1 except that an Ag-Al alloy pipe of Example 1 was replaced with an Ag pipe.
A multifilamentary superconducting wire was produced in the same manner as. When the total AC loss of the obtained multifilamentary superconducting wire was measured in the same manner as in the example, it was 18 kW / m 3 , which was extremely inferior to the example.
【００１７】[0017]
【発明の効果】本発明の多芯酸化物超電導線材は、フィ
ラメント１と安定化材層３との間に高抵抗のＡｇ−Ａｌ
合金層２またはＡｇ−Ｍｇ合金層２が設けられている。
よって、フィラメント１間の横断抵抗率が大きくなるの
で、交流通電時にフィラメント１間に結合電流が流れる
のを遮断して結合損失を低減することができる。従って
本発明によれば、交流用に適用可能な多芯酸化物超電導
線材を提供することができる。The multicore oxide superconducting wire of the present invention has a high resistance Ag-Al between the filament 1 and the stabilizing material layer 3.
The alloy layer 2 or the Ag—Mg alloy layer 2 is provided.
Therefore, since the transverse resistivity between the filaments 1 becomes large, the coupling loss can be reduced by blocking the flow of the coupling current between the filaments 1 when the AC current is applied. Therefore, according to the present invention, it is possible to provide a multi-core oxide superconducting wire applicable to alternating current.
【図１】図１は、本発明の多芯酸化物超電導線材を示す
概略図。FIG. 1 is a schematic view showing a multi-core oxide superconducting wire according to the present invention.
【図２】図２は、従来の多芯酸化物超電導線材を示す概
略図。FIG. 2 is a schematic view showing a conventional multi-core oxide superconducting wire.
１ フィラメント ２ Ａｇ−Ａｌ合金層、Ａｇ−Ｍｇ合金層 ３ 安定化材層 1 Filament 2 Ag-Al alloy layer, Ag-Mg alloy layer 3 Stabilizer layer
Claims (1)
（１）を安定化材層（３）中に複数配置した多芯酸化物
超電導線材であり、前記フィラメント（１）と安定化材
層（３）との間にＡｇ−Ａｌ合金層（２）またはＡｇ−
Ｍｇ合金層（２）が設けられていることを特徴とする多
芯酸化物超電導線材。1. A multi-core oxide superconducting wire comprising a plurality of filaments (1) made of an oxide superconducting material arranged in a stabilizing material layer (3), the filament (1) and the stabilizing material layer (3). Between the Ag-Al alloy layer (2) or Ag-
A multi-core oxide superconducting wire, characterized in that a Mg alloy layer (2) is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5313456A JPH07169342A (en) | 1993-12-14 | 1993-12-14 | Multi-filament oxide superconducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5313456A JPH07169342A (en) | 1993-12-14 | 1993-12-14 | Multi-filament oxide superconducting wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07169342A true JPH07169342A (en) | 1995-07-04 |
Family
ID=18041526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5313456A Pending JPH07169342A (en) | 1993-12-14 | 1993-12-14 | Multi-filament oxide superconducting wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07169342A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001035423A1 (en) * | 1999-11-08 | 2001-05-17 | Sumitomo Electric Industries, Ltd. | High-temperature oxide superconductor wire and method for preparing the same |
| KR100779378B1 (en) * | 2006-10-10 | 2007-11-23 | 성균관대학교산학협력단 | Multi-filament super conductors wire for reducing ac loss and method for producing the same |
-
1993
- 1993-12-14 JP JP5313456A patent/JPH07169342A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001035423A1 (en) * | 1999-11-08 | 2001-05-17 | Sumitomo Electric Industries, Ltd. | High-temperature oxide superconductor wire and method for preparing the same |
| AU777934B2 (en) * | 1999-11-08 | 2004-11-04 | Hiroshi Maeda | High-temperature oxide superconductor wire and method for preparing the same |
| US6828508B1 (en) | 1999-11-08 | 2004-12-07 | Sumitomo Electric Industries, Ltd. | Oxide high-temperature superconductor wire and method of producing the same |
| KR100779378B1 (en) * | 2006-10-10 | 2007-11-23 | 성균관대학교산학협력단 | Multi-filament super conductors wire for reducing ac loss and method for producing the same |
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