JPH0676662A - Manufacture of nb3sn superconducting wire - Google Patents
Manufacture of nb3sn superconducting wireInfo
- Publication number
- JPH0676662A JPH0676662A JP4225651A JP22565192A JPH0676662A JP H0676662 A JPH0676662 A JP H0676662A JP 4225651 A JP4225651 A JP 4225651A JP 22565192 A JP22565192 A JP 22565192A JP H0676662 A JPH0676662 A JP H0676662A
- Authority
- JP
- Japan
- Prior art keywords
- based metal
- layer
- tube
- wire
- composite
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims description 43
- 229910052751 metal Inorganic materials 0.000 claims description 43
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000010955 niobium Substances 0.000 abstract description 47
- 238000009792 diffusion process Methods 0.000 abstract description 9
- 229910052758 niobium Inorganic materials 0.000 abstract description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 7
- 238000005482 strain hardening Methods 0.000 abstract description 7
- 229910000657 niobium-tin Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 36
- 239000011159 matrix material Substances 0.000 description 5
- 239000010953 base metal Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 229910017755 Cu-Sn Inorganic materials 0.000 description 2
- 229910017927 Cu—Sn Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910001362 Ta alloys Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Wire Processing (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は超電導線の製造方法に係
り、特にニオブ・チューブ法による多芯構造のＮｂ3 Ｓ
ｎ超電導線の製造方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a superconducting wire, and more particularly to Nb 3 S having a multi-core structure by the niobium tube method.
The present invention relates to improvement of a method for manufacturing a superconducting wire.
【０００２】[0002]
【従来の技術】多芯構造のＮｂ3 Ｓｎ超電導線の製造方
法として、複合加工法の一種であるニオブ・チューブ法
によるものが知られている（特公昭５５−１６５４７号
公報）。 この方法は、Ｓｎ系金属を芯とし、Ｃｕ系金
属層およびＮｂ系金属層を順次同心的に配置させ、かつ
この外周面にＣｕを接触させた複合体を断面減少加工
後、加熱処理を施すもので、この方法による超電導線は
高磁界中でのＪｃ（臨界電流密度）が大きく、かつＣｕ
−Ｓｎ合金を用いるいわゆるブロンズ法の欠点である多
数回の中間焼鈍を不要とする利点を有しており、非常に
優れた高磁界マグネット用の導体として知られている。2. Description of the Related Art As a method for producing a Nb 3 Sn superconducting wire having a multi-core structure, there is known a method using a niobium tube method which is a kind of composite working method (Japanese Patent Publication No. 55-16547). According to this method, a Sn-based metal is used as a core, a Cu-based metal layer and an Nb-based metal layer are sequentially and concentrically arranged, and a composite in which Cu is brought into contact with the outer peripheral surface is subjected to cross-section reduction processing, and then heat treatment is performed. The superconducting wire produced by this method has a large Jc (critical current density) in a high magnetic field and Cu
It has the advantage of not requiring a large number of intermediate annealings, which is a drawback of the so-called bronze method using -Sn alloy, and is known as an extremely excellent conductor for a high magnetic field magnet.
【０００３】この方法においては、最終的にＣｕマトリ
ックス中に配置された多数の環状のＮｂフィラメントの
内側にＮｂ3 Ｓｎ層が形成されるが、この生成量はＮｂ
系金属の内側に配置されたＳｎ系金属の量に依存する。In this method, an Nb 3 Sn layer is finally formed on the inside of a large number of annular Nb filaments arranged in the Cu matrix.
It depends on the amount of Sn-based metal disposed inside the base metal.
【０００４】従って、高いＪｃ値（非銅のＪｃ。）の線
材を得るためには、拡散後のＳｎ濃度、即ち、Ｎｂ系金
属の内側に配置されたＳｎ系金属とＣｕ系金属が完全に
拡散した場合のＳｎ濃度を約５０wt％程度迄高くするこ
とが行われている。Therefore, in order to obtain a wire having a high Jc value (non-copper Jc.), The Sn concentration after diffusion, that is, the Sn-based metal and the Cu-based metal arranged inside the Nb-based metal are completely removed. The Sn concentration when diffused is increased to about 50 wt%.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記のニ
オブ・チューブ法においては、加工度が１０4 を越える
ような高加工を施すとＮｂフィラメントの破断や断線を
生じ易く細線化が困難であるため、ヒシテリシスロスを
低減するためにフィラメント径を小さくする必要のある
交流用やパルス用の線材の製造に適さないという難点が
あった即ち，ニオブ・チューブ法においては、Ｎｂ系金
属管内部のＳｎ濃度を高くすればＪｃ値を向上させるこ
とができるが、フィラメントの細線化が困難となり、逆
にＮｂ系金属管内部のＳｎ濃度を低下させると、細線化
が容易になるものの、Ｊｃ値が低下するという問題を生
ずる。However, in the above-mentioned niobium tube method, if high working such that the working degree exceeds 10 4 , Nb filaments are easily broken or broken, and it is difficult to thin the wire. There was a problem that it was not suitable for the production of wire for AC or pulse that requires a smaller filament diameter to reduce the hysteresis loss. That is, in the niobium tube method, the Sn concentration inside the Nb-based metal tube is high. If it is done, the Jc value can be improved, but it becomes difficult to thin the filament, and conversely, if the Sn concentration inside the Nb-based metal tube is reduced, the thinning becomes easy, but the Jc value is lowered. Cause
【０００６】フィラメント径を容易に小さくし得る加工
法として内部拡散法が知られているが、拡散源であるＳ
ｎから離れているＮｂに対してはＳｎの供給が不十分と
なるため、ニオブ・チューブ法に比較してＪｃ値が低い
という問題がある。The internal diffusion method is known as a processing method capable of easily reducing the filament diameter.
Since Sn is insufficiently supplied to Nb far from n, there is a problem that the Jc value is low as compared with the niobium tube method.
【０００７】本発明は以上の問題を解決するためになさ
れたもので、ニオブ・チューブ法により細線化が容易
で、かつＪｃ値を向上させることができる製造方法を提
供することをその目的とする。The present invention has been made to solve the above problems, and an object of the present invention is to provide a manufacturing method capable of easily thinning and improving the Jc value by the niobium tube method. .
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、（イ）Ｎｂ系金属管の内部にＣｕ系金属
層で被覆したＳｎ系金属を収容するとともに、Ｎｂ系金
属管の外側にＣｕ系金属層、Ｓｎ系金属層、Ｃｕ系金属
層および拡散遮蔽層を順次配置し、さらにこれらをＣｕ
管中に収容した後、冷間加工を施して断面六角形の複合
線Ａを製造する工程と、（ロ）この複合線Ａの多数本を
Ｃｕ管中に収容した後、冷間加工を施して所定の断面形
状を有する複合線Ｂを製造する工程と、（ハ）この複合
線Ｂに熱処理を施す工程とにより多芯構造のＮｂ3 Ｓｎ
超電導線を製造するものである。上記発明におけるＮｂ
系金属、Ｃｕ系金属およびＳｎ系金属とは、Ｎｂ，Ｃｕ
およびＳｎの他、加工性等を改善するためにこれ等の金
属に微量の元素を添加したものも含まれる。また拡散遮
蔽層は、ＣｕマトリックスをＳｎで汚染させないために
配置されるもので、例えばＴａやＴａ合金等が用いられ
る。In order to achieve the above object, the present invention provides: (a) an Nb-based metal pipe containing an Sn-based metal coated with a Cu-based metal layer inside the Nb-based metal pipe. A Cu-based metal layer, a Sn-based metal layer, a Cu-based metal layer, and a diffusion shielding layer are sequentially arranged outside the
A step of manufacturing the composite wire A having a hexagonal cross-section by accommodating it in a pipe and then cold working, and (b) accommodating a large number of this composite wire A in a Cu pipe, then performing a cold working. To produce a composite wire B having a predetermined cross-sectional shape, and (c) a step of subjecting the composite wire B to a heat treatment, Nb 3 Sn having a multi-core structure is formed.
A superconducting wire is manufactured. Nb in the above invention
The metal series, Cu system metal and Sn system metal are Nb and Cu.
In addition to Sn and Sn, those containing a trace amount of element added to these metals in order to improve workability and the like are also included. The diffusion shield layer is arranged to prevent the Cu matrix from being contaminated with Sn, and is made of, for example, Ta or Ta alloy.
【０００９】さらに、Ｎｂ系金属管内部のＳｎ系金属
は、加工性を向上させるために、Ｎｂ系金属管内部のＣ
ｕ系金属とＳｎ系金属が完全に拡散した時に３０ｗｔ％
以下となるような断面積比で配置することが好ましい。Further, the Sn-based metal inside the Nb-based metal pipe is C inside the Nb-based metal pipe in order to improve workability.
30 wt% when u-based metal and Sn-based metal are completely diffused
It is preferable to arrange them in a cross-sectional area ratio as follows.
【００１０】尚、上記（ロ）の複合線Ｂを製造する工程
を繰り返すことにより、容易にフィラメント数を増加さ
せることができる。The number of filaments can be easily increased by repeating the step (b) of manufacturing the composite wire B.
【００１１】[0011]
【作用】上記構成により、本発明のＮｂ3 Ｓｎ超電導線
の製造方法によれば、Ｎｂ系金属管内部のＳｎ濃度を低
減して加工性を向上させ、またこのＳｎ濃度の低減によ
り不足するＳｎをＮｂ系金属管の外側に配置したＳｎ系
金属層により補うことができるため、Ｎｂフィラメント
の細線化と高いＪｃ値を得ることの両方の目的を同時に
達成することが可能になる。この場合、熱処理によりＮ
ｂ系金属管はその内側および外側よりＳｎと反応して環
状のＮｂ3 Ｓｎ層を生成する。With the above structure, according to the method of manufacturing an Nb 3 Sn superconducting wire of the present invention, the Sn concentration inside the Nb-based metal tube is reduced to improve the workability, and the Sn concentration deficient due to the reduction of the Sn concentration is insufficient. Can be supplemented by the Sn-based metal layer arranged outside the Nb-based metal tube, so that it is possible to achieve both the purposes of thinning the Nb filament and obtaining a high Jc value at the same time. In this case, N by heat treatment
The b-type metal tube reacts with Sn from the inside and the outside to form an annular Nb 3 Sn layer.
【００１２】尚、本発明においては、Ｓｎ系金属、Ｎｂ
系金属および拡散遮蔽層が、いずれもＣｕ系金属を介し
て配置されているため、線材自体の加工性が著しく向上
する。In the present invention, Sn-based metal, Nb
Since the base metal and the diffusion barrier layer are both arranged via the Cu base metal, the workability of the wire itself is significantly improved.
【００１３】[0013]
【実施例】以下本発明の実施例について説明する。EXAMPLES Examples of the present invention will be described below.
【００１４】図２は複合線Ｂの断面図を示したもので、
所定の断面形状を有するＣｕマトリックス１の内部に複
合フィラメント２の多数本が配置された構造を有してお
り、この複合フィラメント２の最外層はＴａ管で被覆さ
れている。FIG. 2 is a sectional view of the composite line B,
It has a structure in which a large number of composite filaments 2 are arranged inside a Cu matrix 1 having a predetermined cross-sectional shape, and the outermost layer of this composite filament 2 is covered with a Ta tube.
【００１５】上記の複合線Ｂは以下のようにして製造さ
れる。The above-mentioned composite wire B is manufactured as follows.
【００１６】図１に示すように、Ｎｂ管３の内部にＣｕ
４で被覆したＳｎ線５を収容するとともに、Ｎｂ管３の
外側にＣｕ層６、Ｓｎ層７、Ｃｕ層８および拡散遮蔽層
９を順次配置し、さらにこれらをＣｕ管１０内に収容し
て複合ロッドＡ´を製造する。 この場合、Ｎｂ管３の
外側に配置されるＣｕ層６、Ｓｎ層７、Ｃｕ層８および
拡散遮蔽層９は、テープ状の材料を重ね巻きすることに
より、任意の厚さに形成することができる。As shown in FIG. 1, Cu is placed inside the Nb tube 3.
While accommodating the Sn wire 5 covered with 4, the Cu layer 6, the Sn layer 7, the Cu layer 8 and the diffusion shielding layer 9 are sequentially arranged on the outside of the Nb tube 3, and further accommodated in the Cu tube 10. The composite rod A'is manufactured. In this case, the Cu layer 6, the Sn layer 7, the Cu layer 8 and the diffusion shielding layer 9 arranged on the outside of the Nb tube 3 can be formed to have an arbitrary thickness by wrapping a tape-shaped material in a layered manner. it can.
【００１７】次いで、複合ロッドＡ´を冷間加工により
断面六角形の複合線Ａに成形し、この複合線Ａの多数本
をＣｕ管中に収容した後、冷間加工を施して複合線Ｂを
製造する。Next, the composite rod A'is formed into a composite wire A having a hexagonal cross section by cold working, and a large number of the composite wires A are accommodated in a Cu pipe, and then cold working is performed to form the composite wire B. To manufacture.
【００１８】この複合線Ｂのマトリックス１は、複合線
Ａの多数本を収容したＣｕ管と複合線Ａの最外層のＣｕ
管１０とにより形成される。The matrix 1 of the composite wire B includes a Cu tube accommodating a large number of the composite wires A and Cu of the outermost layer of the composite wire A.
And the tube 10.
【００１９】上記の複合線Ｂに熱処理を施すことによ
り、Ｎｂ管３内部のＣｕ４とＳｎ線５およびＮｂ管３の
外側のＣｕ層６、８とＳｎ層７とが反応してＣｕ−Ｓｎ
合金を生成した後、このＣｕ−Ｓｎ合金とＮｂ管３との
反応により環状のＮｂ3 Ｓｎ層が形成される。When the composite wire B is heat-treated, the Cu 4 inside the Nb tube 3 and the Sn wire 5 and the Cu layers 6 and 8 outside the Nb tube 3 react with the Sn layer 7 to react Cu—Sn.
After the alloy is formed, the Cu—Sn alloy and the Nb tube 3 react with each other to form an annular Nb 3 Sn layer.
【００２０】具体例 外径φ８mm、内径φ５mmのＮｂ管内に外径φ４．９mmの
Ｃｕ被覆Ｓｎロッドを収容し、Ｎｂ管の外側に厚さ０．
３mmのＣｕシート、厚さ０．２mmのＳｎシート、厚さ
０．３mmのＣｕシートおよび厚さ０．３mmのＴａシート
を順次重ね巻きした後、外径φ１３mm、内径φ１１．５
mmのＣｕ管内に収容した。上記のＣｕ被覆Ｓｎロッド
は、Ｎｂ管内部のＣｕとＳｎとが完全に拡散した時に２
２wt％のＳｎ濃度となるような面積比とした。Concrete Example A Cu-coated Sn rod having an outer diameter of 4.9 mm is housed in an Nb tube having an outer diameter of 8 mm and an inner diameter of 5 mm, and a thickness of 0.
3mm Cu sheet, 0.2mm thickness Sn sheet, 0.3mm thickness Cu sheet and 0.3mm thickness Ta sheet are successively wound, then outer diameter φ13mm, inner diameter φ11.5
It was housed in a Cu tube of mm. The above-mentioned Cu-coated Sn rod is 2 when Cu and Sn inside the Nb tube are completely diffused.
The area ratio was set so that the Sn concentration was 2 wt%.
【００２１】次いで、これに冷間加工を施し、対辺間距
離２．２７mmの断面六角形のシングル線を製造した後、
このシングル線の２６４本をその側面を当接して集合
し、これらを外径φ４９mm、内径φ４３．５mmのＣｕ管
内に収容した後、伸線加工を施した複合線の伸線加工限
界は外径φ０．１０３mm以下であり、この時のフィラメ
ント径は約３μｍで、またフィラメントの破断も認めら
れず、加工性も良好であった。Next, this is subjected to cold working to manufacture a single wire having a hexagonal cross section with a distance between opposite sides of 2.27 mm, and
After gathering 264 single wires with their side surfaces abutting and accommodating them in a Cu pipe with an outer diameter of φ49 mm and an inner diameter of 43.5 mm, the wire drawing limit of the composite wire subjected to wire drawing is the outer diameter. The diameter was φ0.103 mm or less, the filament diameter was about 3 μm at this time, the filament was not broken, and the workability was good.
【００２２】また、外径φ１．０mm、フィラメント径約
３０μｍの複合線に、６５０℃×４８時間の熱処理を施
して多芯構造のＮｂ3 Ｓｎ超電導線を製造し、その特性
を測定した結果、Ｊｃ値は１５Ｔで８５０Ａ／mm2 の比
較的高い値を示した。Further, a composite wire having an outer diameter of φ1.0 mm and a filament diameter of about 30 μm was subjected to heat treatment at 650 ° C. for 48 hours to produce a Nb 3 Sn superconducting wire having a multi-core structure, and its characteristics were measured. The Jc value at 15T was a relatively high value of 850 A / mm 2 .
【００２３】[0023]
【発明の効果】以上述べたように本発明のＮｂ3 Ｓｎ超
電導線の製造方法によれば、加工性が良好である上、Ｎ
ｂ系金属管の内外からＳｎが拡散してＮｂ3 Ｓｎ層が生
成されるため、臨界電流密度の高い超電導線を製造する
ことができる。As described above, according to the method for producing a Nb 3 Sn superconducting wire of the present invention, the workability is good and the Nb 3 Sn superconducting wire has a good workability.
Since Sn diffuses from the inside and outside of the b-type metal tube to form the Nb 3 Sn layer, a superconducting wire having a high critical current density can be manufactured.
【図１】本発明におけるシングル線の加工前の状態を示
す断面図。FIG. 1 is a cross-sectional view showing a state before processing a single wire according to the present invention.
【図２】本発明ににおける複合線Ｂの断面図。FIG. 2 is a sectional view of a composite wire B according to the present invention.
１………Ｃｕマトリックス ２………複合フィラメント ３………Ｎｂ管 ４………Ｃｕ ５………Ｓｎ線 ６、８、…Ｃｕ層 ７………Ｓｎ層 ９………拡散遮蔽層 1 ... Cu matrix 2 ... Composite filament 3 ... Nb tube 4 ... Cu 5 ... Sn wire 6, 8, Cu layer 7 ... Sn layer 9 ... Diffusion shield layer
フロントページの続き (72)発明者 熊野 智幸 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 (72)発明者 野呂 治人 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内Front page continuation (72) Inventor Tomoyuki Kumano 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. No. 1 Showa Electric Cable Co., Ltd.
Claims (2)
で被覆したＳｎ系金属を収容するとともに、前記Ｎｂ系
金属管の外側にＣｕ系金属層、Ｓｎ系金属層、Ｃｕ系金
属層および拡散遮蔽層を順次配置し、さらにこれらをＣ
ｕ管中に収容した後、冷間加工を施して断面六角形の複
合線Ａを製造する工程と、（ロ）前記複合線Ａの多数本
をＣｕ管中に収容した後、冷間加工を施して所定の断面
形状を有する複合線Ｂを製造する工程と、（ハ）前記複
合線ＢにＮｂ3 Ｓｎ生成の熱処理を施す工程とからなる
ことを特徴とするＮｂ3 Ｓｎ超電導線の製造方法。(A) An Sn-based metal coated with a Cu-based metal layer is housed inside a Nb-based metal tube, and a Cu-based metal layer, a Sn-based metal layer, and a Cu-based metal are provided outside the Nb-based metal tube. A metal layer and a diffusion-shielding layer are sequentially arranged, and these are C
a step of producing a composite wire A having a hexagonal cross-section after being housed in a u pipe, and (b) storing a large number of the composite wires A in a Cu pipe, and then performing a cold work. process and, (iii) the manufacturing method of the composite wire Nb 3 Sn superconducting wire, characterized by comprising a step of performing heat treatment of the Nb 3 Sn generated B to produce a composite wire B having a predetermined sectional shape by applying .
系金属管内部のＣｕ系金属とＳｎ系金属が完全に拡散し
た時に３０wt％以下であることを特徴とする請求項１記
載のＮｂ3 Ｓｎ超電導線の製造方法。2. The Sn concentration inside the Nb-based metal tube is the Nb-based
The method for producing an Nb 3 Sn superconducting wire according to claim 1, wherein the content of Cu-based metal and Sn-based metal inside the system-based metal tube is 30 wt% or less when completely diffused.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4225651A JPH0676662A (en) | 1992-08-25 | 1992-08-25 | Manufacture of nb3sn superconducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4225651A JPH0676662A (en) | 1992-08-25 | 1992-08-25 | Manufacture of nb3sn superconducting wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0676662A true JPH0676662A (en) | 1994-03-18 |
Family
ID=16832640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4225651A Withdrawn JPH0676662A (en) | 1992-08-25 | 1992-08-25 | Manufacture of nb3sn superconducting wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0676662A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6120266A (en) * | 1995-06-20 | 2000-09-19 | Atlas Copco Airpower, Naamloze Vennootschap | Piston mechanism with a flow passage through the piston |
-
1992
- 1992-08-25 JP JP4225651A patent/JPH0676662A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6120266A (en) * | 1995-06-20 | 2000-09-19 | Atlas Copco Airpower, Naamloze Vennootschap | Piston mechanism with a flow passage through the piston |
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| A300 | Withdrawal of application because of no request for examination |
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