JPH02122037A - Oxygen free copper of cryogenic use and super conducting wire rod by using it - Google Patents
Oxygen free copper of cryogenic use and super conducting wire rod by using itInfo
- Publication number
- JPH02122037A JPH02122037A JP63275820A JP27582088A JPH02122037A JP H02122037 A JPH02122037 A JP H02122037A JP 63275820 A JP63275820 A JP 63275820A JP 27582088 A JP27582088 A JP 27582088A JP H02122037 A JPH02122037 A JP H02122037A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- copper
- free copper
- conducting wire
- weight
- 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
- 239000010949 copper Substances 0.000 title claims abstract description 35
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000001301 oxygen Substances 0.000 title claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 239000002887 superconductor Substances 0.000 claims description 4
- 239000007858 starting material Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 229910020012 Nb—Ti Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000005491 wire drawing Methods 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、極低温下において顕著に低減された電気抵抗
を示現する極低温用無酸素銅およびそれを用いた超電導
線材に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to cryogenic oxygen-free copper that exhibits significantly reduced electrical resistance at cryogenic temperatures and superconducting wire using the same.
［従来の技術１
今日実用化されている超電導線には、超電導体が使用中
何らかの原因で超電導から常電導に転位した際にその電
流によって焼損事故などが発生ずるのを防止するために
、超電導体の外周に電気抵抗の低い銅やアルミニウムよ
りなる安定化材が設けられている。[Conventional technology 1] Superconducting wires that are in practical use today are equipped with superconducting wires to prevent burnout accidents caused by the current when the superconductor changes from superconducting to normal conducting for some reason during use. A stabilizing material made of copper or aluminum with low electrical resistance is provided around the outer circumference of the body.
この安定化材は、超電導体よりあふれ出た電流を導通さ
せ大きな発熱に発展させることなく再び超電導状態に復
帰させるものであるから、工業的に実用化されている超
電導体の動作温度である２０に以下の極低温域において
出来る限り電気抵抗が小さな材料であることが要求され
る。This stabilizing material conducts the current overflowing from the superconductor and restores it to the superconducting state without causing large heat generation, so it is at the operating temperature of 20°C, which is the operating temperature of superconductors in industrial use. Therefore, materials are required to have as low electrical resistance as possible in the following extremely low temperature range.
上記のような要求特性に適合する材料として、従来より
無酸素銅が広く使用されてきた。Oxygen-free copper has been widely used as a material meeting the above-mentioned required properties.
このような目的に使用される無酸素銅を工業的に製造す
る一般的方法としては、電気銅を連続鋳造装置により溶
解ｇＪ造し、得られた鋳塊を誘導加熱により約８００℃
に数分間加熱した後熱間鍛造あるいは熱間押出しにより
いったん棒状または管状に加工し、れを更に冷間加工お
よび中間焼鈍工程の組合せにより所要形状例えば超電導
押出用ビレットにおける銅材料に成形加工するのが通常
である。A general method for industrially manufacturing oxygen-free copper used for such purposes is to melt electrolytic copper using a continuous casting machine and heat the resulting ingot to approximately 800°C by induction heating.
After heating for several minutes, it is first processed into a bar or tube shape by hot forging or hot extrusion, and then further formed into a desired shape, such as a copper material in a billet for superconducting extrusion, by a combination of cold working and intermediate annealing steps. is normal.
［発明が解決しようとする課題」
無酸素銅は、これを高純度化し焼鈍することで例えば３
００以上といった大きな残留抵抗比（２９３にでの比抵
抗／４．２にでの比抵抗）を示すようになる。[Problem to be solved by the invention] Oxygen-free copper can be purified and annealed to
It shows a large residual resistance ratio of 00 or more (specific resistance at 293/specific resistance at 4.2).
一方、近年超電導線材の利用分野が、核融合実験装置や
高エネルギ物理実験用加速装置、磁気源り列車といった
いわば研究開発段階の技術分野から医療用ＭＨＩといっ
た恒常的民生品へと拡大されるようになり、超電導線材
への要求特性もそれなりにきびしさか付加され、とくに
熱的及び電気的安定性に対する要求が一段と高まって、
極低温下においてより一１電気抵抗の小さい安定化材が
求められるようになった。On the other hand, in recent years, the field of use of superconducting wires has expanded from technical fields at the research and development stage, such as nuclear fusion experimental devices, accelerators for high-energy physics experiments, and magnetic source trains, to permanent consumer products such as medical MHI. As a result, the characteristics required for superconducting wires have become somewhat stricter, and in particular, the requirements for thermal and electrical stability have further increased.
Stabilizing materials with lower electrical resistance at extremely low temperatures are now required.
本発明の目的は、上記したような実情にがんがみてなさ
れたものであり、従来よりも極低温域における電気抵抗
を大巾に低減せしめた！！酸素銅およびそれを安定化材
としてなる超電導線材を提供しようとするものである。The purpose of the present invention was made in consideration of the above-mentioned actual situation, and it is to significantly reduce the electrical resistance in the extremely low temperature range than before! ! The present invention aims to provide oxygenated copper and a superconducting wire material using it as a stabilizing material.
［課題を解決するための手段］
本発明は、無酸素銅において酸素含有量を０．０００１
〜０．００５重量％、不可避なる不純物の合計を０．０
０５重量％以下とすると共に鋳塊状態で８００〜１００
０°Ｃにおける１時間以上の熱履歴をもたせたものであ
り、そのような無酸素銅を超電導線材における安定化材
として使用したものである。[Means for Solving the Problems] The present invention provides oxygen content of 0.0001 in oxygen-free copper.
~0.005% by weight, total of unavoidable impurities 0.0%
05% by weight or less and 800 to 100 in the ingot state
It has a thermal history of 1 hour or more at 0°C, and such oxygen-free copper is used as a stabilizing material in a superconducting wire.
酸素含有量をｏ、ｏｏｏｉ〜０．００５重量％の範囲に
［根室したのは、０．０００１％以下では本発明の熱履
歴を与えても極低温下での電気抵抗は小さくならず、一
方、０．００５重量％以上では加工性が劣化するなめで
ある。Nemuro set the oxygen content in the range of o, oooi to 0.005% by weight, because if it is less than 0.0001%, the electrical resistance at extremely low temperatures will not decrease even if the thermal history of the present invention is given; If the content exceeds 0.005% by weight, processability deteriorates.
また、不可避的不純物の合計を０．００５重量％以下と
したのは、これ以上では極低温下での電気抵抗を増大さ
せるためである。当然乍ら、不純物の量は極力少ないこ
とが望ましく、特に極低温下での電気抵抗を著しく増大
させるＦｅ、Ｐ。Further, the reason why the total amount of unavoidable impurities is set to 0.005% by weight or less is that if it exceeds this value, the electrical resistance will increase at extremely low temperatures. Of course, it is desirable that the amount of impurities be as small as possible, especially Fe and P, which significantly increase electrical resistance at extremely low temperatures.
Ｓｌ、Ａｓ等の不純物を抑えることが望ましい。It is desirable to suppress impurities such as Sl and As.
さらに、熱間加工前における熱履歴を８００℃〜１００
０℃にて１時間以上としたのは、この条件外では電気抵
抗の著しい低減が見られないためである。Furthermore, the thermal history before hot working is 800℃~100℃.
The reason why the temperature was set at 0° C. for 1 hour or more is because a significant reduction in electrical resistance is not observed outside of this condition.
［作用］
本発明に係る無酸素銅が如何なる理由により極低温下に
おいて電気抵抗の低下か顕著となるのがという点につい
ては、必ずしも定かではない、想うに、電気抵抗に悪影
響を及ぼずＦｅ 、Ｐ、Ｓｉ 。[Function] It is not necessarily clear why the oxygen-free copper according to the present invention exhibits a significant decrease in electrical resistance at extremely low temperatures. P, Si.
ＡＳ等の不純物か鋳塊段階では固溶状態にあり、これに
高温長時間の熱履歴が与えられることにより残留してい
る酸素と化合物を形成し析出するためではなかろうかと
解される。ｉ量の酸素の残留が必要であるということが
、そのことを具体的に示唆しているということができる
。It is thought that this is because impurities such as AS are in a solid solution state at the ingot stage, and when they are given a high temperature and long-term thermal history, they form a compound with residual oxygen and precipitate. The fact that i amount of oxygen is required to remain can be said to specifically indicate this.
［実施例］ 以下に、本発明について実施例を参照し説明する。[Example] The present invention will be described below with reference to Examples.
実施例１
電気銅を原材料とし、全連続溶解鋳造設備により酸素濃
度を０〜０．０２重量％の範囲に調整させながらビレッ
トに鋳造した。得られたビレットの酸素以外の不純物は
Ａ＜１ ；０．０００８重量％、Ｓｈｏ、０００６％、
ｐＨ；ｏ、０００５％等であり、合計で０．００３％で
あった。Example 1 Electrolytic copper was used as a raw material and was cast into a billet using fully continuous melting and casting equipment while adjusting the oxygen concentration within the range of 0 to 0.02% by weight. Impurities other than oxygen in the obtained billet were A<1; 0.0008% by weight, Sho, 0006%,
pH: o, 0005%, etc., and the total was 0.003%.
これらのビレットを７００℃〜１０５０℃で０．１〜２
４時間加熱した後、熱間押出機にて、外径的１００Ｎ、
肉厚約２０市の大径管に押出加工した。この大径管より
切断、面前によって外径１５市の試料を採取し、これに
中間焼鈍、引抜伸線等の加工を加えて１．０市径の線材
としな、これを更に５００’ＣＸ １時間非酸化性雰囲
気中で加熱した後、４，２にの液体ヘリウム中で４＠子
法により電気抵抗を測定した。These billets were heated at 700℃ to 1050℃ to 0.1 to 2
After heating for 4 hours, the outer diameter was 100N using a hot extruder.
It was extruded into a large diameter pipe with a wall thickness of approximately 20 mm. Samples with an outer diameter of 15 mm were taken from this large-diameter tube by cutting and facing, and processed by intermediate annealing, drawing wire drawing, etc. to make wire rods with a diameter of 1.0 mm, which were then further processed into 500'CX 1. After heating in a non-oxidizing atmosphere for an hour, the electrical resistance was measured in liquid helium using the 4@son method.
第１表にその結果を示す。Table 1 shows the results.
第
表
第１表より明らかなように、加熱温度としては８００°
Ｃ〜１０００℃、加熱時間として１時間以上、酸素濃度
としては０．０００１重量％以上において良好な極低温
下での電気抵抗値が得られることがわかる。酸素は加工
性に大きな影響を及ばずので好まＱくは０．０００２〜
０．０００５重量％程度にとどめるのがよい、Ｎｏ、１
２．１３は電気抵抗は良好であるが加工性が著しく悪く
なるため本発明の範囲外となるのである。As is clear from Table 1, the heating temperature is 800°.
It can be seen that a good electrical resistance value at extremely low temperatures can be obtained at a temperature of C to 1000°C, a heating time of 1 hour or more, and an oxygen concentration of 0.0001% by weight or more. Oxygen does not have a large effect on processability, so preferably Q is 0.0002~
It is best to keep it at about 0.0005% by weight, No. 1
2.13 has good electrical resistance, but the workability is significantly poor, and is therefore outside the scope of the present invention.
実線例２
超電導線材へ適用した場合の効果を確認するため、前記
第１表中における本発明の範囲外のＮＯ３１と本発明に
係るＮｏ、３のそれぞれの押出太径管を冷間拡管引抜加
工、焼鈍を繰り返して外径１４０市、肉厚１０市の大径
管とし、この鋼管に外径１１８市のＮｂ−４６，５重量
％１゛ｉ合金よりなる超電導材を挿入して静水圧押出用
ビレットとし、これを静水圧押出後、冷間引抜によって
Ｃｕ／Ｎｂ−Ｔｉ複合シングル線とした。Solid line example 2 In order to confirm the effect when applied to superconducting wire, cold expansion drawing was performed on extruded large diameter tubes of No. 31 outside the scope of the present invention and No. 3 according to the present invention in Table 1 above. A large-diameter tube with an outer diameter of 140 mm and a wall thickness of 10 mm was obtained by repeated annealing, and a superconducting material made of Nb-46, 5% by weight 1゛i alloy with an outer diameter of 118 mm was inserted into this steel tube and hydrostatically extruded. This was made into a Cu/Nb-Ti composite single wire by isostatic pressure extrusion and cold drawing.
このシングル線の多数本を上記と同様にして作製した大
径鋼管内に挿入してマルチ超電導線押出用ビレットとし
、このビレッ１−を押出、冷間引抜時効熱処理加工する
ことにより外径１．２市、銅比２．０、Ｎｂ −’Ｔ’
ｉ フィラメントの径が２０μｍ、フィラメント数が１
２００本の超電導線としな。A large number of these single wires are inserted into a large-diameter steel pipe prepared in the same manner as described above to form a billet for extruding multi-superconducting wires, and this billet is extruded, cold drawn, and subjected to aging heat treatment to obtain an outer diameter of 1. 2 cities, copper ratio 2.0, Nb-'T'
i The diameter of the filament is 20 μm, the number of filaments is 1
200 superconducting wires.
この超電導線を、超電導特性を劣化させずに安定化銅部
か軟化する条件である２５０″ＣＸ３時間加熱した後、
その超電導線について極低温下での電気抵抗を測定した
。その結果第１表のＮＯ６１の！！酸素銅を使用した超
電導線の比抵抗（ａｔｌＯＫは８．６ Ｘ １０−９Ω
・■、Ｎ０８３の無酸素銅を使用したそれは５．９Ｘ１
０−９Ω・ｌであり、本発明の有効性が確認された。After heating this superconducting wire for 3 hours at 250"C, which is a condition that softens the stabilized copper part without deteriorating the superconducting properties,
The electrical resistance of the superconducting wire was measured at extremely low temperatures. As a result, No. 61 in Table 1! ! Specific resistance of superconducting wire using oxygen copper (atlOK is 8.6 x 10-9Ω
・■, using N083 oxygen-free copper, it is 5.9X1
It was 0-9Ω·l, confirming the effectiveness of the present invention.
上記は合金系超電導線に適用したものであるが本発明に
係る無酸素銅は、所謂ブロンズ法で作製した化合物系の
ＮｂａＳｎ超電導線材に対する安定化材としても同様の
効果を期待できるものであることはいうまでもない。Although the above is applied to alloy-based superconducting wire, the oxygen-free copper according to the present invention can be expected to have the same effect as a stabilizing material for compound-based NbaSn superconducting wire produced by the so-called bronze method. Needless to say.
本発明に係る！−酸素別をＣｕ／Ｎｂ−’ｒｉ複合多芯
線に適用する場合、特にフィシメン１〜径が１０μｍ以
下になると時効熱処理時にＣｕとＮｂ−Ｔｉ間の反応か
激しくなり、Ｎｂ −Ｔｉ中の特にＴｉがＣＬｌ側に拡
散してＣｕを汚染し、本発明の効果が薄れる可能性があ
る。これを防止するためには、シングル線の断面＃Ｉ逍
をＣｕ ／Ｎｂ ／Ｎｂ −Ｔ＋ 、Ｃｕ ／Ｖ／Ｎｂ
−Ｔ又はＣｕ ／Ｔａ ／Ｎｂ−Ｔｉ等の構造となし
、Ｎ１１１．Ｖ又はＴａをＣｕとＴ１間の反応抑制拡散
バリヤとすることが望ましい。Pertaining to the present invention! - When applying oxygen separation to Cu/Nb-'ri composite multifilamentary wire, the reaction between Cu and Nb-Ti becomes intense during aging heat treatment, especially when the ficimen diameter is less than 10 μm. may diffuse to the CL1 side and contaminate the Cu, reducing the effectiveness of the present invention. In order to prevent this, the cross section #I of the single wire should be changed to Cu /Nb /Nb -T+, Cu /V/Nb
-T or a structure such as Cu/Ta/Nb-Ti, N111. It is desirable to use V or Ta as a reaction inhibiting diffusion barrier between Cu and T1.
以上は、本発明に係る無酸素銅を安定化材として使用す
る場合について説明したが、その応用範囲はそれにのみ
限定されるものではない。Although the case where the oxygen-free copper according to the present invention is used as a stabilizing material has been described above, the scope of its application is not limited thereto.
本発明に係る無酸素銅は、極低温下での熱伝導度も大き
いのであり、極低温用伝熱材料としても非常に有効であ
る。The oxygen-free copper according to the present invention has high thermal conductivity at extremely low temperatures, and is therefore very effective as a heat transfer material for extremely low temperatures.
なお、本発明に係る熱履歴を与えるに際し、加熱後その
まま連続して熱間加工に入る必要はない。In addition, when providing the thermal history according to the present invention, it is not necessary to continue hot working immediately after heating.
すなわち、８００〜１０００℃に１時間以上加熱し、そ
れをいったん室温にまで冷却し、その後再加熱して熱間
加工を行なっても、−度与えた熱履歴の効果は変らない
のである。その際の再加熱は、本発明が規定する８００
℃以下でかつ１時間以下であっても差支えはないのであ
る。In other words, even if the material is heated to 800 to 1000° C. for more than one hour, cooled down to room temperature, and then reheated for hot working, the effect of the thermal history given by -degrees does not change. The reheating at that time is 800 yen as specified by the present invention.
There is no problem even if the temperature is below ℃ and for one hour or less.
［発明の効果１
以上の通り、本発明によれば、高純度無酸素銅中に微量
の酸素を残留させかつ鋳塊段階で高温、長時］ｍの熱履
歴を与えるだけで、極低温下での電気抵抗および熱伝導
特性が顕著に改善されかつ加工性において潰れた無酸素
銅を提供し得るものであり、超電導線用安定化材をはじ
め極低温下で用いられる材料の特性改良に寄与するとこ
ろが非常に大きい６[Effect of the invention 1] As described above, according to the present invention, high-purity oxygen-free copper can be heated at extremely low temperatures by simply leaving a small amount of oxygen in it and giving it a thermal history of m at high temperature and for a long time in the ingot stage. It can provide oxygen-free copper with markedly improved electrical resistance and thermal conductivity properties and improved workability, contributing to improving the properties of materials used at extremely low temperatures, including stabilizing materials for superconducting wires. There are a lot of things to do6
Claims (1)
あってその他不可避なる不純物の合計が０．００５重量
％以下の高純度を有し、かつ鋳塊状態で８００〜１００
０℃の温度における１時間以上の熱履歴を有してなる極
低温用無酸素銅。 （２）超電導体の外周に酸素含有量が ０．０００１〜０．００５重量％であってその他不可避
なる不純物の合計が０．００５重量％以下であり、かつ
鋳塊状態で８００〜 １０００℃の温度における１時間以上の熱履歴を有して
なる無酸素銅よりなる安定化材を設けてなる超電導線材
。Scope of Claims: (1) High purity with an oxygen content of 0.0001 to 0.005% by weight and a total of other unavoidable impurities of 0.005% by weight or less, and in an ingot state. 800-100
Oxygen-free copper for cryogenic use having a thermal history of 1 hour or more at a temperature of 0°C. (2) The oxygen content in the outer periphery of the superconductor is 0.0001 to 0.005% by weight, the total amount of other unavoidable impurities is 0.005% by weight or less, and the temperature in the ingot state is 800 to 1000°C. A superconducting wire provided with a stabilizing material made of oxygen-free copper having a thermal history of 1 hour or more at a temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275820A JPH02122037A (en) | 1988-10-31 | 1988-10-31 | Oxygen free copper of cryogenic use and super conducting wire rod by using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275820A JPH02122037A (en) | 1988-10-31 | 1988-10-31 | Oxygen free copper of cryogenic use and super conducting wire rod by using it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02122037A true JPH02122037A (en) | 1990-05-09 |
Family
ID=17560879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63275820A Pending JPH02122037A (en) | 1988-10-31 | 1988-10-31 | Oxygen free copper of cryogenic use and super conducting wire rod by using it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02122037A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5497528A (en) * | 1978-01-20 | 1979-08-01 | Sumitomo Electric Ind Ltd | Copperr alloy soft conductor and method of making same |
| JPS56139643A (en) * | 1980-04-02 | 1981-10-31 | Sumitomo Electric Ind Ltd | Copper conductor for use at ultralow temperature and its manufacture |
-
1988
- 1988-10-31 JP JP63275820A patent/JPH02122037A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5497528A (en) * | 1978-01-20 | 1979-08-01 | Sumitomo Electric Ind Ltd | Copperr alloy soft conductor and method of making same |
| JPS56139643A (en) * | 1980-04-02 | 1981-10-31 | Sumitomo Electric Ind Ltd | Copper conductor for use at ultralow temperature and its manufacture |
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