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JP2013218914A - Oxide superconducting wire with reinforcement member - Google Patents

Oxide superconducting wire with reinforcement member Download PDF

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JP2013218914A
JP2013218914A JP2012089289A JP2012089289A JP2013218914A JP 2013218914 A JP2013218914 A JP 2013218914A JP 2012089289 A JP2012089289 A JP 2012089289A JP 2012089289 A JP2012089289 A JP 2012089289A JP 2013218914 A JP2013218914 A JP 2013218914A
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oxide superconducting
superconducting wire
reinforcing material
solder
width
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Yuki Shinkai
優樹 新海
Masaya Konishi
昌也 小西
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to JP2012089289A priority Critical patent/JP2013218914A/en
Priority to US14/387,991 priority patent/US20150045230A1/en
Priority to KR20147028057A priority patent/KR20150008062A/en
Priority to PCT/JP2013/059809 priority patent/WO2013153973A1/en
Priority to EP13775960.1A priority patent/EP2838090A4/en
Priority to CN201380019346.XA priority patent/CN104221097A/en
Publication of JP2013218914A publication Critical patent/JP2013218914A/en
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    • YGENERAL 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
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    • Y02E40/60Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

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Abstract

【課題】エッジ部の強度低下に伴う補強材の剥がれなどの不良の発生が充分に抑制されて、安定した超電導特性の維持を図ることができる補強材付き酸化物超電導線材を提供する。
【解決手段】酸化物超電導線材を挟むように2枚の補強材が配置された補強材付き酸化物超電導線材であって、補強材の幅が、酸化物超電導線材の幅以下であり、補強材と酸化物超電導線材との間に半田層が設けられている補強材付き酸化物超電導線材。酸化物超電導線材および補強材の長手方向に直交する断面における側面部が、半田で覆われている補強材付き酸化物超電導線材。酸化物超電導線材の長手方向に直交する断面における外周部が、銀または銅、あるいはこれらの金属の1種以上を含む合金で覆われている補強材付き酸化物超電導線材。
【選択図】図1
The present invention provides an oxide superconducting wire with a reinforcing material capable of sufficiently suppressing the occurrence of defects such as peeling of the reinforcing material due to a decrease in strength of an edge portion and maintaining stable superconducting characteristics.
An oxide superconducting wire with a reinforcing material in which two reinforcing materials are arranged so as to sandwich an oxide superconducting wire, wherein the width of the reinforcing material is equal to or less than the width of the oxide superconducting wire. An oxide superconducting wire with a reinforcing material in which a solder layer is provided between the oxide superconducting wire and the oxide superconducting wire. An oxide superconducting wire with a reinforcing material in which a side surface in a cross section perpendicular to the longitudinal direction of the oxide superconducting wire and the reinforcing material is covered with solder. An oxide superconducting wire with a reinforcing material, wherein an outer peripheral portion in a cross section perpendicular to the longitudinal direction of the oxide superconducting wire is covered with silver, copper, or an alloy containing one or more of these metals.
[Selection] Figure 1

Description

本発明は、酸化物超電導線材の両面に補強材を配置して補強層を設けた補強材付き酸化物超電導線材に関する。   The present invention relates to an oxide superconducting wire with a reinforcing material in which a reinforcing material is provided on both sides of an oxide superconducting wire and a reinforcing layer is provided.

液体窒素の温度で超電導性を有する高温超電導体の発見以来、ケーブル、限流器、マグネットなどの電力機器への応用を目指した高温超電導線材の開発が活発に行われている。中でも、金属基板上に配向したRE123系(RE:希土類元素)等の酸化物超電導層を形成させた酸化物超電導線材が注目されている。   Since the discovery of high-temperature superconductors that have superconductivity at the temperature of liquid nitrogen, development of high-temperature superconducting wires aimed at application to power devices such as cables, current limiters, and magnets has been actively conducted. Among them, an oxide superconducting wire in which an oxide superconducting layer such as RE123 (RE: rare earth element) oriented on a metal substrate is attracting attention.

このような酸化物超電導線材には、酸化物超電導線材の強度を補強したり、異常電流に対するバイパスとして酸化物超電導線材を保護するために補強層を設けることが一般に行われており、例えば、酸化物超電導線材の両面に配置された金属テープなどの補強材を半田を用いて酸化物超電導線材に貼り付けた補強層が設けられている(例えば特許文献1)。   Such an oxide superconducting wire is generally provided with a reinforcing layer to reinforce the strength of the oxide superconducting wire or protect the oxide superconducting wire as a bypass against abnormal current. A reinforcing layer is provided in which a reinforcing material such as a metal tape disposed on both surfaces of a physical superconducting wire is attached to an oxide superconducting wire using solder (for example, Patent Document 1).

特許第3949960号公報Japanese Patent No. 3949960

しかしながら、上記のように、両面に配置された補強材が半田により貼り付けられた従来の補強材付き酸化物超電導線材の場合、その構造が原因で以下のように、不良が多く発生する恐れがあった。   However, as described above, in the case of a conventional oxide superconducting wire with a reinforcing material in which the reinforcing material arranged on both sides is attached by soldering, there is a risk that many defects will occur due to its structure as follows. there were.

図2に、従来の補強材付き酸化物超電導線材の具体的な一例として、特許文献1に記載された補強材付き酸化物超電導線材の構造を模式的に示す。図2において、1は補強材付き酸化物超電導線材、2は酸化物超電導線材、3は補強材、4は半田(半田層)、5はエッジ部(側面部)である。   FIG. 2 schematically shows the structure of an oxide superconducting wire with reinforcing material described in Patent Document 1 as a specific example of a conventional oxide superconducting wire with reinforcing material. In FIG. 2, 1 is an oxide superconducting wire with a reinforcing material, 2 is an oxide superconducting wire, 3 is a reinforcing material, 4 is solder (solder layer), and 5 is an edge portion (side surface portion).

図2に示すように、補強材付き酸化物超電導線材1は、酸化物超電導線材2の両面に補強材3が配置され、酸化物超電導線材2と補強材3とが半田4により接着されている。しかし、2枚の補強材3は、幅が酸化物超電導線材2よりも広く、また、上下の補強材3の間隔が狭いため、エッジ部5に半田を侵入させにくく、図2のように、上下2枚の補強材の間の全てに半田を侵入させることは容易ではない。そして、半田で埋まらない部分ができると、エッジ部5の強度が低くなり、力が加わった場合、補強材が剥がれるなどの不良が発生し、安定した超電導特性の維持を図ることができない恐れがある。また、冷却に液体窒素などの冷媒を用いた場合、半田がない部分に液体窒素が浸透する可能性がある。そうすると、昇温時に気化した窒素でその部分がふくれ、超電導特性が劣化するバルーニング不良の発生原因となる恐れもある。   As shown in FIG. 2, in the oxide superconducting wire 1 with the reinforcing material, the reinforcing material 3 is disposed on both surfaces of the oxide superconducting wire 2, and the oxide superconducting wire 2 and the reinforcing material 3 are bonded by the solder 4. . However, the two reinforcing members 3 are wider than the oxide superconducting wire 2 and the distance between the upper and lower reinforcing members 3 is narrow, so that it is difficult for solder to enter the edge portion 5, as shown in FIG. It is not easy to make solder penetrate between all the upper and lower reinforcing members. If a portion that is not filled with solder is formed, the strength of the edge portion 5 is reduced, and when the force is applied, a failure such as peeling of the reinforcing material may occur, and stable superconducting characteristics may not be maintained. is there. Further, when a coolant such as liquid nitrogen is used for cooling, liquid nitrogen may penetrate into a portion where there is no solder. In this case, nitrogen that is vaporized at the time of temperature rise may cause the portion to bulge and cause a ballooning defect that deteriorates the superconducting characteristics.

そこで、本発明は、エッジ部の強度低下に伴う補強材の剥がれなどの不良の発生が充分に抑制されて、安定した超電導特性の維持を図ることができる補強材付き酸化物超電導線材を提供することを課題とする。   Therefore, the present invention provides an oxide superconducting wire with a reinforcing material that can sufficiently suppress the occurrence of defects such as peeling of the reinforcing material due to a decrease in strength of the edge portion and can maintain stable superconducting characteristics. This is the issue.

本発明者は、鋭意検討の結果、以下に記載する発明により上記課題が解決できることを見出し、本発明を完成するに至った。以下、各請求項の発明について説明する。   As a result of intensive studies, the present inventor has found that the above problems can be solved by the invention described below, and has completed the present invention. Hereinafter, the invention of each claim will be described.

請求項1に記載の発明は、
酸化物超電導線材を挟むように2枚の補強材が配置された補強材付き酸化物超電導線材であって、
前記補強材の幅が、前記酸化物超電導線材の幅以下であり、
前記補強材と前記酸化物超電導線材との間に半田層が設けられている
ことを特徴とする補強材付き酸化物超電導線材である。
The invention described in claim 1
An oxide superconducting wire with a reinforcing material in which two reinforcing materials are arranged so as to sandwich the oxide superconducting wire,
The width of the reinforcing material is equal to or less than the width of the oxide superconducting wire;
The oxide superconducting wire with a reinforcing material, wherein a solder layer is provided between the reinforcing material and the oxide superconducting wire.

本請求項の発明においては、補強材の幅が酸化物超電導線材の幅以下に設定されているため、上下2枚の補強材が狭い間隔で配置されていても、補強材の間に空間が形成されず、従来のような半田で埋まらないエッジ部が形成されず、エッジ部の強度低下に伴う不良がない補強材付き酸化物超電導線材を提供することができる。   In the invention of this claim, since the width of the reinforcing material is set to be equal to or less than the width of the oxide superconducting wire, there is a space between the reinforcing materials even when the two upper and lower reinforcing materials are arranged at a narrow interval. It is possible to provide an oxide superconducting wire with a reinforcing material that is not formed, an edge portion that is not filled with solder as in the prior art is not formed, and there is no defect due to a decrease in strength of the edge portion.

請求項2に記載の発明は、
前記補強材の幅が、前記酸化物超電導線材の幅と同じであることを特徴とする請求項1に記載の補強材付き酸化物超電導線材である。
The invention described in claim 2
2. The oxide superconducting wire with reinforcing material according to claim 1, wherein a width of the reinforcing material is the same as a width of the oxide superconducting wire.

補強材の幅を酸化物超電導線材の幅と同じ幅とすることにより、補強効果をより発揮させることができ好ましい。   By making the width of the reinforcing material the same as the width of the oxide superconducting wire, the reinforcing effect can be exhibited more preferably.

請求項3に記載の発明は、
前記酸化物超電導線材および前記補強材の長手方向に直交する断面における側面部が、半田で覆われていることを特徴とする請求項1または請求項2に記載の補強材付き酸化物超電導線材である。
The invention according to claim 3
3. The oxide superconducting wire with reinforcing material according to claim 1, wherein a side surface portion in a cross section perpendicular to a longitudinal direction of the oxide superconducting wire and the reinforcing material is covered with solder. is there.

補強材の幅が酸化物超電導線材の幅以下に設定されているため、酸化物超電導線材および補強材の長手方向に直交する断面における側面部を確実に半田で覆うことができる。このため、エッジ部の強度低下に伴う不良の発生が一層抑制された補強材付き酸化物超電導線材を提供することができる。   Since the width of the reinforcing material is set to be equal to or smaller than the width of the oxide superconducting wire, the side surface portions in the cross section perpendicular to the longitudinal direction of the oxide superconducting wire and the reinforcing material can be reliably covered with solder. For this reason, it is possible to provide an oxide superconducting wire with a reinforcing material in which the occurrence of defects due to the strength reduction of the edge portion is further suppressed.

請求項4に記載の発明は、
前記酸化物超電導線材の長手方向に直交する断面における外周部が、銀または銅、あるいはこれらの金属の1種以上を含む合金で覆われていることを特徴とする請求項1ないし請求項3のいずれか1項に記載の補強材付き酸化物超電導線材である。
The invention according to claim 4
The outer periphery of the cross section perpendicular to the longitudinal direction of the oxide superconducting wire is covered with silver or copper, or an alloy containing one or more of these metals. It is an oxide superconducting wire with a reinforcing material according to any one of the items.

銀(Ag)、銅(Cu)、あるいはこれらの金属の1種以上を含む合金は、電気伝導性に優れているため、これらの材料で酸化物超電導線材の長手方向に直交する断面における外周部を覆うことにより、保護層を形成させて、より安定した超電導特性を発揮させることができる。   Since silver (Ag), copper (Cu), or an alloy containing one or more of these metals is excellent in electrical conductivity, the outer peripheral portion of the cross section perpendicular to the longitudinal direction of the oxide superconducting wire is made of these materials. By covering, a protective layer can be formed, and more stable superconducting characteristics can be exhibited.

具体的なAg合金としては、Sn−Ag合金、Cu−Ag合金、Au−Ag合金、Ni−Ag合金、Pd−Ag合金などを挙げることができ、また、Cu合金としては、Ni−Cu合金、Sn−Cu合金、Au−Cu合金、Pd−Cu合金などを挙げることができる。   Specific examples of the Ag alloy include Sn—Ag alloy, Cu—Ag alloy, Au—Ag alloy, Ni—Ag alloy, Pd—Ag alloy and the like, and examples of the Cu alloy include Ni—Cu alloys. , Sn—Cu alloy, Au—Cu alloy, Pd—Cu alloy, and the like.

請求項5に記載の発明は、
長手方向に直交する断面における外周部が半田で覆われていることを特徴とする請求項1ないし請求項4のいずれか1項に記載の補強材付き酸化物超電導線材である。
The invention described in claim 5
5. The oxide superconducting wire with a reinforcing material according to claim 1, wherein an outer peripheral portion in a cross section perpendicular to the longitudinal direction is covered with solder.

本請求項の発明においては、補強材付き酸化物超電導線材の長手方向に直交する断面における外周部が半田で覆われているため、補強材のはがれが一層抑制され、不良の発生がさらに抑制される。   In the invention of this claim, since the outer peripheral portion in the cross section orthogonal to the longitudinal direction of the oxide superconducting wire with reinforcing material is covered with solder, peeling of the reinforcing material is further suppressed, and the occurrence of defects is further suppressed. The

請求項6に記載の発明は、
長さが10m以上であることを特徴とする請求項1ないし請求項5のいずれか1項に記載の補強材付き酸化物超電導線材である。
The invention described in claim 6
6. The oxide superconducting wire with reinforcing material according to any one of claims 1 to 5, wherein the length is 10 m or more.

長さが10m以上の長尺の補強材付き酸化物超電導線材は、コイル、限流器などに使用され、補強材のはがれ不良が問題になるケースが多い。本発明をこのように補強材のはがれ不良が問題になる長尺の補強材付き酸化物超電導線材に適用することにより、本発明の効果が一層顕著に発揮される。   Oxide superconducting wires with a long reinforcing material having a length of 10 m or more are used for coils, current limiters and the like, and there are many cases where the peeling failure of the reinforcing material becomes a problem. By applying the present invention to a long oxide superconducting wire with a reinforcing material in which the problem of peeling failure of the reinforcing material becomes a problem in this way, the effect of the present invention is more remarkably exhibited.

請求項7に記載の発明は、
前記半田が、Pb−Sn系、Ag−Sn系、Sn−Cu系、Pb−Sn−Ag系、Pb−Sn−Cu系、Sn−Ag−Cu系のいずれかの系の半田であることを特徴とする請求項1ないし請求項6のいずれか1項に記載の補強材付き酸化物超電導線材である。
The invention described in claim 7
The solder is Pb—Sn, Ag—Sn, Sn—Cu, Pb—Sn—Ag, Pb—Sn—Cu, or Sn—Ag—Cu solder. The oxide superconducting wire with reinforcing material according to any one of claims 1 to 6.

Pb−Sn系、Ag−Sn系、Sn−Cu系、Pb−Sn−Ag系、Pb−Sn−Cu系、Sn−Ag−Cu系の半田は比較的低い温度で用いることができる半田である。このような半田を用いた場合、高温による超電導特性の劣化を防ぐことができるため好ましい。特に、Sn−Cu系、Pb−Sn−Cu系、Sn−Ag−Cu系はCuが入っていることにより超電導線材のCuが溶食しにくくなり、より好ましい。   Pb—Sn, Ag—Sn, Sn—Cu, Pb—Sn—Ag, Pb—Sn—Cu, and Sn—Ag—Cu solders can be used at relatively low temperatures. . The use of such solder is preferable because it can prevent deterioration of superconducting characteristics due to high temperature. In particular, Sn—Cu, Pb—Sn—Cu, and Sn—Ag—Cu systems are more preferable because Cu is less likely to corrode due to the inclusion of Cu.

請求項8に記載の発明は、
前記補強材の材質が、
ニッケル、鉄、クロム、またはこれらの金属の1種以上を含む合金、
あるいは、炭素、珪素、またはこれらの1種以上を含む繊維が用いられたフレキシブルな材料
であることを特徴とする請求項1ないし請求項7のいずれか1項に記載の補強材付き酸化物超電導線材である。
The invention according to claim 8 provides:
The material of the reinforcing material is
Nickel, iron, chromium, or an alloy containing one or more of these metals,
Alternatively, the oxide superconductor with a reinforcing material according to any one of claims 1 to 7, which is a flexible material using carbon, silicon, or a fiber containing at least one of these. It is a wire.

ニッケル(Ni)、鉄(Fe)、クロム(Cr)またはこれらの金属の1種以上を含む合金は、耐摩耗性、高い降伏応力などの機械特性に優れているため、補強材として好ましい。   Nickel (Ni), iron (Fe), chromium (Cr), or an alloy containing one or more of these metals is preferable as a reinforcing material because it has excellent mechanical properties such as wear resistance and high yield stress.

具体的なNi合金としては、Cu−Ni合金、Fe−Ni合金、Cr−Ni合金、Sn−Ni合金、Sn−Ni−Ag合金など、Fe合金としては、Ni−Fe合金、Cr−Fe合金、Cu−Fe合金、Ag−Fe合金、Sn−Fe合金、Sn−Fe−Ag合金など、また、Cr合金としては、Zn−Cr合金、Pb−Cr合金を挙げることができる。   Specific Ni alloys include Cu—Ni alloys, Fe—Ni alloys, Cr—Ni alloys, Sn—Ni alloys, Sn—Ni—Ag alloys, and the like, and Fe alloys include Ni—Fe alloys and Cr—Fe alloys. Cu—Fe alloy, Ag—Fe alloy, Sn—Fe alloy, Sn—Fe—Ag alloy, and the like, and examples of the Cr alloy include a Zn—Cr alloy and a Pb—Cr alloy.

また、炭素、珪素も、半田に対する濡れ性に優れ、補強性にも優れているため、補強材として好ましい。また、これらの1種以上を含む繊維を樹脂などを用いて固めたフレキシブルな材料は、展性がないため、酸化物超電導線材の強度がより向上する。   Carbon and silicon are also preferable as reinforcing materials because they have excellent wettability to solder and excellent reinforcement. Moreover, since the flexible material which hardened the fiber containing 1 or more types of these using resin etc. does not have malleability, the intensity | strength of an oxide superconducting wire improves more.

請求項9に記載の発明は、
前記酸化物超電導線材が、厚み10μm以下の薄膜酸化物超電導層が形成された酸化物超電導線材であることを特徴とする請求項1ないし請求項8のいずれか1項に記載の補強材付き酸化物超電導線材である。
The invention according to claim 9 is:
9. The oxidation with a reinforcing material according to claim 1, wherein the oxide superconducting wire is an oxide superconducting wire having a thin film oxide superconducting layer having a thickness of 10 μm or less. Superconducting wire.

薄膜酸化物超電導線材は、一般的に強度が低く、補強材のはがれも発生しやすい。このような薄膜酸化物超電導線材に本発明を適用することにより、本発明の効果を顕著に発揮させることができ好ましい。   A thin-film oxide superconducting wire generally has low strength, and the reinforcing material is easily peeled off. By applying the present invention to such a thin film oxide superconducting wire, the effects of the present invention can be remarkably exhibited, which is preferable.

本発明によれば、エッジ部の強度低下に伴う補強材の剥がれなどの不良の発生が充分に抑制されて、安定した超電導特性の維持を図ることができる補強材付き酸化物超電導線材を提供することができる。   According to the present invention, it is possible to provide an oxide superconducting wire with a reinforcing material in which occurrence of defects such as peeling of the reinforcing material due to a decrease in strength of the edge portion is sufficiently suppressed and stable superconducting characteristics can be maintained. be able to.

本発明の一実施の形態の補強材付き酸化物超電導線材の構造を模式的に示す断面図である。It is sectional drawing which shows typically the structure of the oxide superconducting wire with a reinforcing material of one embodiment of this invention. 従来の補強材付き酸化物超電導線材の構造を模式的に示す断面図である。It is sectional drawing which shows typically the structure of the conventional oxide superconducting wire with a reinforcing material.

以下、本発明を実施の形態に基づき図面を用いて説明する。   Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

(補強材付き酸化物超電導線材)
1.全体構成
(1)断面形状
はじめに、補強材付き酸化物超電導線材の概要を説明する。図1は本実施の形態における補強材付き酸化物超電導線材の構造を模式的に示す断面図であり、図1において、1は補強材付き酸化物超電導線材、2は酸化物超電導線材、3は補強材、4は半田(半田層)である。
(Oxide superconducting wire with reinforcing material)
1. Overall Configuration (1) Cross-sectional Shape First, an outline of an oxide superconducting wire with a reinforcing material will be described. FIG. 1 is a cross-sectional view schematically showing the structure of an oxide superconducting wire with reinforcing material in the present embodiment. In FIG. 1, 1 is an oxide superconducting wire with reinforcing material, 2 is an oxide superconducting wire, 3 is The reinforcing material 4 is solder (solder layer).

補強材3は酸化物超電導線材2を挟むように酸化物超電導線材2の両面に配置されている。酸化物超電導線材2と補強材3との間には半田層4が設けられ、補強材3が酸化物超電導線材2に貼り付けられている。また、補強材付き酸化物超電導線材1の側面は半田4で覆われている。   The reinforcing material 3 is disposed on both surfaces of the oxide superconducting wire 2 so as to sandwich the oxide superconducting wire 2. A solder layer 4 is provided between the oxide superconducting wire 2 and the reinforcing material 3, and the reinforcing material 3 is attached to the oxide superconducting wire 2. The side surface of the oxide superconducting wire 1 with the reinforcing material is covered with solder 4.

(2)長さ、形態
補強材付き酸化物超電導線材1の長さおよび形態は特に限定されないが、前記のように10m以上の長尺の補強材付き酸化物超電導線材1が好ましく、また、配向基板上に厚み10μm以下の薄膜酸化物超電導層が形成された酸化物超電導線材1が好ましい。
(2) Length and form The length and form of the oxide superconducting wire 1 with a reinforcing material are not particularly limited, but the oxide superconducting wire 1 with a reinforcing material having a length of 10 m or more is preferable and oriented as described above. The oxide superconducting wire 1 in which a thin film oxide superconducting layer having a thickness of 10 μm or less is formed on a substrate is preferable.

2.酸化物超電導線材
次に、酸化物超電導線材2について説明する。前記のように、酸化物超電導線材2は、配向基板上に、例えばRE123系(RE:希土類元素)等の酸化物超電導層が形成されている。酸化物超電導線材の幅、厚みは必要に応じて適宜決定されるが、幅が4mm程度、厚みが100〜200μmが好ましい。
2. Next, the oxide superconducting wire 2 will be described. As described above, the oxide superconducting wire 2 has an oxide superconducting layer such as RE123 (RE: rare earth element) formed on an alignment substrate. Although the width | variety and thickness of an oxide superconducting wire are suitably determined as needed, about 4 mm in width and 100-200 micrometers in thickness are preferable.

(1)配向基板
配向基板としては、金属基板材上に中間層が設けられた配向基板が好ましい。金属基板材には、c軸に2軸配向した配向金属基板が好ましく、例えば、IBAD基材、Ni−W合金基材、SUS等をベース金属としたクラッドタイプの金属基板材等を用いることができる。また中間層としては、一般的には、CeO、YSZなどの安定化ジルコニア、Yの等を用いることができ、格子整合性や臨界電流密度(Jc)を高くできるなどの観点から、CeOが最上層に使用される。
(1) Alignment substrate The alignment substrate is preferably an alignment substrate in which an intermediate layer is provided on a metal substrate material. The metal substrate material is preferably an oriented metal substrate that is biaxially oriented with respect to the c-axis. For example, an IBAD base material, a Ni-W alloy base material, a clad-type metal substrate material based on SUS, or the like may be used. it can. Further, as the intermediate layer, generally, stabilized zirconia such as CeO 2 and YSZ, Y 2 O 3 and the like can be used, from the viewpoint of increasing lattice matching and critical current density (Jc). CeO 2 is used for the top layer.

(2)酸化物超電導層
酸化物超電導層は、例えば、RE123系酸化物超電導体で形成され、REとしては、イットリウム(Y)、ガドリウム(Gd)、ホルミウム(Ho)、サマリウム(Sm)などが好ましい。酸化物超電導層の形成方法としては、例えば塗布熱分解法(MOD法)やPLD法などの気相成長法が用いられる。
(2) Oxide superconducting layer The oxide superconducting layer is formed of, for example, an RE123-based oxide superconductor. Examples of the RE include yttrium (Y), gadolinium (Gd), holmium (Ho), and samarium (Sm). preferable. As a method for forming the oxide superconducting layer, for example, a vapor deposition method such as a coating pyrolysis method (MOD method) or a PLD method is used.

(3)保護層
酸化物超電導層が形成された酸化物超電導線材の長手方向に直交する断面における外周部は、銀または銅、あるいはこれらの金属の合金からなる保護層で覆われていることが好ましい。保護層を設けることにより、より安定した超電導特性を発揮させることができる。保護層の厚みとしては、0.02〜50μmが好ましく、0.02〜5μmであるとより好ましい。保護層の形成方法としては、例えばめっき法やスパッタ法などが用いられる。
(3) Protective layer The outer peripheral part in the cross section orthogonal to the longitudinal direction of the oxide superconducting wire formed with the oxide superconducting layer is covered with a protective layer made of silver, copper, or an alloy of these metals. preferable. By providing the protective layer, more stable superconducting characteristics can be exhibited. As thickness of a protective layer, 0.02-50 micrometers is preferable and it is more preferable in it being 0.02-5 micrometers. As a method for forming the protective layer, for example, a plating method or a sputtering method is used.

3.補強材
次に、補強材3について説明する。補強材3の幅は、酸化物超電導線材2の幅以下とし、超電導線材2の幅をはみ出さないように配置されている。このように配置することにより、2枚の補強材の間に半田の侵入を阻害する隙間ができない。なお、補強材として充分に機能させるためには、酸化物超電導線材2の幅の50%以上の幅であることが好ましく、90%以上であるとより好ましく、100%であると特に好ましい。また、厚みは特に限定されないが、酸化物超電導線材2よりも薄いことが好ましく、具体的には、5〜200μmが好ましく、50〜100μmがより好ましい。
3. Reinforcing Material Next, the reinforcing material 3 will be described. The width of the reinforcing material 3 is set to be equal to or smaller than the width of the oxide superconducting wire 2 and is arranged so as not to protrude the width of the superconducting wire 2. By arranging in this way, there is no gap between the two reinforcing members that hinders solder penetration. In order to sufficiently function as a reinforcing material, the width is preferably 50% or more of the width of the oxide superconducting wire 2, more preferably 90% or more, and particularly preferably 100%. Moreover, although thickness is not specifically limited, It is preferable that it is thinner than the oxide superconducting wire 2, Specifically, 5-200 micrometers is preferable and 50-100 micrometers is more preferable.

補強材3の材質としては、前記したようにNi、Fe、Cr、またはこれらの金属の1種以上を含む合金が好ましい。   As described above, the material of the reinforcing material 3 is preferably Ni, Fe, Cr, or an alloy containing one or more of these metals.

また、C、Siまたはこれらの1種以上を含む繊維をエポキシ樹脂やフッ素樹脂などの樹脂で固めたフレキシブルな材料も好ましい。   Further, a flexible material in which fibers containing C, Si, or one or more of these are hardened with a resin such as an epoxy resin or a fluorine resin is also preferable.

4.半田層
次に、半田層4について説明する。半田層4の形成に用いられる半田は特に限定されないが、Pb−Sn系、Ag−Sn系、Sn−Cu系、Pb−Sn−Ag系、Pb−Sn−Cu系、Sn−Ag−Cu系等の半田が好ましく用いられる。
4). Next, the solder layer 4 will be described. The solder used for forming the solder layer 4 is not particularly limited, but is Pb—Sn, Ag—Sn, Sn—Cu, Pb—Sn—Ag, Pb—Sn—Cu, Sn—Ag—Cu. Such solder is preferably used.

半田層4は、図1に示すように、酸化物超電導線材2および補強材3の長手方向に直交する断面における側面部を覆うように設けられていることが好ましいが、補強材付き酸化物超電導線材1の長手方向に直交する断面における外周部を覆うように設けられてもよい。半田層4をこのように設けることにより、エッジ部の強度不足による不良の発生がより確実に抑制され、また、補強材3のはがれがより確実に防止される。   As shown in FIG. 1, the solder layer 4 is preferably provided so as to cover the side surface in the cross section perpendicular to the longitudinal direction of the oxide superconducting wire 2 and the reinforcing material 3. You may provide so that the outer peripheral part in the cross section orthogonal to the longitudinal direction of the wire 1 may be covered. By providing the solder layer 4 in this way, the occurrence of defects due to insufficient strength of the edge portion is more reliably suppressed, and the peeling of the reinforcing material 3 is more reliably prevented.

酸化物超電導線材2と補強材3との間における半田層4の厚みとしては、補強材3の厚みよりもさらに薄く、具体的には1μm以下であることが好ましい。また、酸化物超電導線材2および補強材3の長手方向に直交する断面における側面部における半田4の厚みとしては、10〜100μmであることが好ましい。また、補強材付き酸化物超電導線材1の長手方向に直交する断面における外周部を覆う場合、補強材3の表面における半田4の厚みとしては、1〜20μmであることが好ましい。   The thickness of the solder layer 4 between the oxide superconducting wire 2 and the reinforcing material 3 is preferably thinner than the thickness of the reinforcing material 3, specifically, 1 μm or less. In addition, the thickness of the solder 4 at the side surface in the cross section perpendicular to the longitudinal direction of the oxide superconducting wire 2 and the reinforcing material 3 is preferably 10 to 100 μm. Moreover, when covering the outer peripheral part in the cross section orthogonal to the longitudinal direction of the oxide superconducting wire 1 with a reinforcing material, as thickness of the solder 4 in the surface of the reinforcing material 3, it is preferable that it is 1-20 micrometers.

以上のように、本実施の形態によれば、補強材付き酸化物超電導線材のエッジ部の強度不足による不良の発生を抑制することができ、また、補強材のはがれを防止することができる。   As described above, according to the present embodiment, it is possible to suppress the occurrence of defects due to insufficient strength of the edge portion of the oxide superconducting wire with reinforcing material, and it is possible to prevent the reinforcing material from peeling off.

次に、実施例に基づき、本発明をより具体的に説明する。なお、以下の実施例においては、酸化物超電導線材としてY123系酸化物超電導線材を用いた。   Next, based on an Example, this invention is demonstrated more concretely. In the following examples, a Y123-based oxide superconducting wire was used as the oxide superconducting wire.

1.補強材付き酸化物超電導線材の作製
(実施例)
上記した実施の形態に基づき、以下の手順で、本実施例の補強材付き酸化物超電導線材を作製した。
1. Production of oxide superconducting wire with reinforcement (Example)
Based on the above-described embodiment, an oxide superconducting wire with a reinforcing material of this example was produced according to the following procedure.

(1)酸化物超電導線材の作製
(a)配向基板の準備
最初に、金属基板として、SUS層(厚み100μm)上に、Cu層(厚み20μm)、Ni層(厚み2μm)が順に形成されたNi/Cu/SUSクラッド基板(幅30mm×長さ10m)を準備した。
(1) Preparation of oxide superconducting wire (a) Preparation of alignment substrate First, a Cu layer (thickness 20 μm) and a Ni layer (thickness 2 μm) were sequentially formed on a SUS layer (thickness 100 μm) as a metal substrate. A Ni / Cu / SUS clad substrate (width 30 mm × length 10 m) was prepared.

次に、RFスパッタ法を用いて、金属基板の表面に、CeO層(厚み100nm)、YSZ層(厚み400nm)、CeO層(厚み70nm)の順に成膜を行って中間層を形成し、配向基板とした。 Next, using an RF sputtering method, a CeO 2 layer (thickness 100 nm), a YSZ layer (thickness 400 nm), and a CeO 2 layer (thickness 70 nm) are formed in this order on the surface of the metal substrate to form an intermediate layer. An alignment substrate was obtained.

(b)酸化物超電導層の形成
次に、PLD法を用いて、配向金属基板上に、厚み2μmのY123酸化物超電導層を成膜した。
(B) Formation of Oxide Superconducting Layer Next, a Y123 oxide superconducting layer having a thickness of 2 μm was formed on the oriented metal substrate using the PLD method.

(c)保護層の形成
次に、酸化物超電導層が形成された酸化物超電導線材の外周に、スパッタ法を用いて、厚み5μmのAg層を形成し、酸化物超電導線材の作製を完了した。
(C) Formation of Protective Layer Next, a 5 μm thick Ag layer was formed on the outer periphery of the oxide superconducting wire on which the oxide superconducting layer was formed by using a sputtering method, thereby completing the production of the oxide superconducting wire. .

(2)補強材付き酸化物超電導線材の作製
(a)補強材の準備
次に、補強材として、作製された酸化物超電導線材と同じ幅、長さのCu(厚み:50μm)板を2枚準備した。
(2) Production of oxide superconducting wire with reinforcing material (a) Preparation of reinforcing material Next, as a reinforcing material, two Cu (thickness: 50 μm) plates having the same width and length as the produced oxide superconducting wire. Got ready.

(b)補強材の貼り付け
酸化物超電導線材の両面に補強材を配置した後、Ag−Sn系の半田を用いて、これらを接合させると共に、酸化物超電導線材および補強材の長手方向に直交する断面における側面部も半田で覆って、幅4mm×厚み0.17mm×長さ10mの補強材付き酸化物超電導線材を作製した。
(B) Affixing of the reinforcing material After the reinforcing material is disposed on both surfaces of the oxide superconducting wire, they are joined using an Ag-Sn solder and orthogonal to the longitudinal direction of the oxide superconducting wire and the reinforcing material. The side part in the cross section to be covered was also covered with solder to produce an oxide superconducting wire with a reinforcing material having a width of 4 mm, a thickness of 0.17 mm, and a length of 10 m.

具体的には、Ag−Sn系の半田が溶融した槽を用意し、そこにCu補強材で挟んだ超電導線材を通すことにより、酸化物超電導線材と補強材とを接合させた。また、reel to reelシステムを用いて連続して行うことにより10m長の実施例サンプルを試作した。   Specifically, a bath in which Ag-Sn solder was melted was prepared, and a superconducting wire sandwiched between Cu reinforcing materials was passed therethrough, thereby joining the oxide superconducting wire and the reinforcing material. In addition, a 10 m long example sample was prototyped by performing continuously using a reel to reel system.

(比較例)
補強材として酸化物超電導線材の幅より広い幅4.2mmのCu板を用い、補強材の間に半田が入る範囲で半田を入れたこと以外は実施例と同様にして、比較例の補強材付き酸化物超電導線材を作製した。
(Comparative example)
The reinforcing material of the comparative example is the same as the example except that a 4.2 mm wide Cu plate wider than the width of the oxide superconducting wire is used as the reinforcing material, and the solder is inserted in the range where the solder enters between the reinforcing materials. An attached oxide superconducting wire was prepared.

2.評価
得られた各補強材付き酸化物超電導線材について、以下の項目について評価した。
(1)密着性
まず、得られた各補強材付き酸化物超電導線材の断面を樹脂に埋め込み、幅方向に切断した後、その切断面を研磨することにより断面を出し、この断面を光学顕微鏡を用いて観察し、酸化物超電導線材、補強材および半田間の密着状態を観察した。
2. Evaluation The following items were evaluated for each obtained oxide superconducting wire with reinforcing material.
(1) Adhesiveness First, after embedding a cross section of each obtained oxide superconducting wire with reinforcing material in a resin and cutting in the width direction, the cross section is polished to obtain a cross section. And observed the adhesion state between the oxide superconducting wire, the reinforcing material and the solder.

その結果、実施例の場合には、これらの間には隙間が見られず、充分に密着していることが分かった。これに対して、比較例の場合には、酸化物超電導線材のエッジ部分に半田が入りきらずに、くぼみが形成されていることが確認され、充分な密着性が確保されていないことが分かった。   As a result, in the case of the example, it was found that there was no gap between them, and that they were in close contact. On the other hand, in the case of the comparative example, it was confirmed that a recess was formed without the solder entering the edge portion of the oxide superconducting wire, and sufficient adhesion was not ensured. .

次に、各補強材付き酸化物超電導線材を20、30、40、50,60、70mmφのマンドレルを用いて、各直径において180°の折り曲げを行った後、上記と同様に各直径毎に観察を行って、曲げ直径による酸化物超電導線材、補強材および半田間の剥離の有無を評価した。   Next, the oxide superconducting wire with each reinforcing material was bent 180 ° at each diameter using a mandrel of 20, 30, 40, 50, 60, and 70 mmφ, and then observed for each diameter in the same manner as above. And the presence or absence of delamination between the oxide superconducting wire, the reinforcing material and the solder due to the bending diameter was evaluated.

その結果、実施例ではこれらの間には剥離は観察されなかったが、比較例では30mmφ以下の曲げ直径において酸化物超電導線材と半田の間に剥離が観察された。   As a result, no peeling was observed between these in the examples, but in the comparative example, peeling was observed between the oxide superconducting wire and the solder at a bending diameter of 30 mmφ or less.

(2)超電導特性(Ic)の測定
各補強材付き酸化物超電導線材について、上記の折り曲げの前後にIcを測定し(直流四端子法、77.3K、自己磁場下)、折り曲げによるIcの変化を評価した。
(2) Measurement of superconducting properties (Ic) For each oxide superconducting wire with reinforcing material, Ic was measured before and after the above bending (DC four-terminal method, 77.3K, under self-magnetic field), and the change in Ic by bending Evaluated.

その結果、実施例では、折り曲げ前の105A/4mm幅が、どの曲げ直径で折り曲げた後も105A/4mm幅であり、変化していなかった。これは、上記したように、折り曲げを行っても剥離が生じなかったためである。   As a result, in the examples, the 105 A / 4 mm width before bending was 105 A / 4 mm width after being bent at any bending diameter, and was not changed. This is because, as described above, peeling did not occur even when bending was performed.

これに対して、比較例では、剥離が生じたために、折り曲げ前の97A/4mm幅が、30mmφ折り曲げ後には、87A/4mm幅にまで低下していた。また、20mmφ折り曲げ後には、50A/4mm幅まで大きく低下していた。   On the other hand, in the comparative example, since peeling occurred, the 97 A / 4 mm width before bending was reduced to 87 A / 4 mm width after 30 mmφ bending. Moreover, after bending 20 mmφ, it was greatly reduced to a width of 50 A / 4 mm.

以上の結果より、本発明を適用することにより、安定した超電導特性の維持を図ることができることが分かる。   From the above results, it is understood that stable superconducting characteristics can be maintained by applying the present invention.

以上、本発明を実施の形態に基づき説明したが、本発明は上記の実施の形態に限定されるものではない。本発明と同一および均等の範囲内において、上記の実施の形態に対して種々の変更を加えることが可能である。   As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

1 補強材付き酸化物超電導線材
2 酸化物超電導線材
3 補強材
4 半田(半田層)
5 エッジ部(側面部)
1 Oxide superconducting wire with reinforcing material 2 Oxide superconducting wire 3 Reinforcing material 4 Solder (solder layer)
5 Edge (side)

Claims (9)

酸化物超電導線材を挟むように2枚の補強材が配置された補強材付き酸化物超電導線材であって、
前記補強材の幅が、前記酸化物超電導線材の幅以下であり、
前記補強材と前記酸化物超電導線材との間に半田層が設けられている
ことを特徴とする補強材付き酸化物超電導線材。
An oxide superconducting wire with a reinforcing material in which two reinforcing materials are arranged so as to sandwich the oxide superconducting wire,
The width of the reinforcing material is equal to or less than the width of the oxide superconducting wire;
An oxide superconducting wire with a reinforcing material, wherein a solder layer is provided between the reinforcing material and the oxide superconducting wire.
前記補強材の幅が、前記酸化物超電導線材の幅と同じであることを特徴とする請求項1に記載の補強材付き酸化物超電導線材。   The oxide superconducting wire with reinforcing material according to claim 1, wherein the width of the reinforcing material is the same as the width of the oxide superconducting wire. 前記酸化物超電導線材および前記補強材の長手方向に直交する断面における側面部が、半田で覆われていることを特徴とする請求項1または請求項2に記載の補強材付き酸化物超電導線材。   The oxide superconducting wire with a reinforcing material according to claim 1 or 2, wherein a side surface portion in a cross section orthogonal to a longitudinal direction of the oxide superconducting wire and the reinforcing material is covered with solder. 前記酸化物超電導線材の長手方向に直交する断面における外周部が、銀または銅、あるいはこれらの金属の1種以上を含む合金で覆われていることを特徴とする請求項1ないし請求項3のいずれか1項に記載の補強材付き酸化物超電導線材。   The outer periphery of the cross section perpendicular to the longitudinal direction of the oxide superconducting wire is covered with silver or copper, or an alloy containing one or more of these metals. The oxide superconducting wire with a reinforcing material according to any one of the above items. 長手方向に直交する断面における外周部が半田で覆われていることを特徴とする請求項1ないし請求項4のいずれか1項に記載の補強材付き酸化物超電導線材。   The oxide superconducting wire with a reinforcing material according to any one of claims 1 to 4, wherein an outer peripheral portion in a cross section perpendicular to the longitudinal direction is covered with solder. 長さが10m以上であることを特徴とする請求項1ないし請求項5のいずれか1項に記載の補強材付き酸化物超電導線材。   The oxide superconducting wire with reinforcing material according to any one of claims 1 to 5, wherein the length is 10 m or more. 前記半田が、Pb−Sn系、Ag−Sn系、Sn−Cu系、Pb−Sn−Ag系、Pb−Sn−Cu系、Sn−Ag−Cu系のいずれかの系の半田であることを特徴とする請求項1ないし請求項6のいずれか1項に記載の補強材付き酸化物超電導線材。   The solder is Pb—Sn, Ag—Sn, Sn—Cu, Pb—Sn—Ag, Pb—Sn—Cu, or Sn—Ag—Cu solder. The oxide superconducting wire with a reinforcing material according to any one of claims 1 to 6, wherein the oxide superconducting wire has a reinforcing material. 前記補強材の材質が、
ニッケル、鉄、クロム、またはこれらの金属の1種以上を含む合金、
あるいは、炭素、珪素、またはこれらの1種以上を含む繊維が用いられたフレキシブルな材料
であることを特徴とする請求項1ないし請求項7のいずれか1項に記載の補強材付き酸化物超電導線材。
The material of the reinforcing material is
Nickel, iron, chromium, or an alloy containing one or more of these metals,
Alternatively, the oxide superconductor with a reinforcing material according to any one of claims 1 to 7, which is a flexible material using carbon, silicon, or a fiber containing at least one of these. wire.
請求項9に記載の発明は、
前記酸化物超電導線材が、厚み10μm以下の薄膜酸化物超電導層が形成された酸化物超電導線材であることを特徴とする請求項1ないし請求項8のいずれか1項に記載の補強材付き酸化物超電導線材。
The invention according to claim 9 is:
9. The oxidation with a reinforcing material according to claim 1, wherein the oxide superconducting wire is an oxide superconducting wire having a thin film oxide superconducting layer having a thickness of 10 μm or less. Superconducting wire.
JP2012089289A 2012-04-10 2012-04-10 Oxide superconducting wire with reinforcement member Pending JP2013218914A (en)

Priority Applications (6)

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JP2012089289A JP2013218914A (en) 2012-04-10 2012-04-10 Oxide superconducting wire with reinforcement member
US14/387,991 US20150045230A1 (en) 2012-04-10 2013-04-01 Reinforcing-member-equipped oxide superconducting wire
KR20147028057A KR20150008062A (en) 2012-04-10 2013-04-01 Oxide superconducting wire having reinforcing materials
PCT/JP2013/059809 WO2013153973A1 (en) 2012-04-10 2013-04-01 Oxide superconducting wire having reinforcing materials
EP13775960.1A EP2838090A4 (en) 2012-04-10 2013-04-01 OXIDE SUPERCONDUCTING WIRE COMPRISING REINFORCING MATERIALS
CN201380019346.XA CN104221097A (en) 2012-04-10 2013-04-01 Oxide superconducting wire having reinforcing materials

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018530853A (en) * 2015-06-30 2018-10-18 エルエス ケーブル アンド システム リミテッド. Superconducting wire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018530853A (en) * 2015-06-30 2018-10-18 エルエス ケーブル アンド システム リミテッド. Superconducting wire

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