JPH03216919A - Manufacture of oxide superconductor wire - Google Patents
Manufacture of oxide superconductor wireInfo
- Publication number
- JPH03216919A JPH03216919A JP2011507A JP1150790A JPH03216919A JP H03216919 A JPH03216919 A JP H03216919A JP 2011507 A JP2011507 A JP 2011507A JP 1150790 A JP1150790 A JP 1150790A JP H03216919 A JPH03216919 A JP H03216919A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- sheath
- silver
- powder
- oxide superconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000002887 superconductor Substances 0.000 title abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 21
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052709 silver Inorganic materials 0.000 claims abstract description 17
- 239000004332 silver Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000005491 wire drawing Methods 0.000 claims abstract description 3
- 238000004857 zone melting Methods 0.000 abstract description 6
- 238000007796 conventional method Methods 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 229910001316 Ag alloy Inorganic materials 0.000 abstract description 3
- IHWJXGQYRBHUIF-UHFFFAOYSA-N [Ag].[Pt] Chemical compound [Ag].[Pt] IHWJXGQYRBHUIF-UHFFFAOYSA-N 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 244000062175 Fittonia argyroneura Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium 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
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- 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、臨界電流密度の高い酸化物超電導線材の製造
方法に関し、より詳しくは、高周波加熱処理を行うとい
う簡昼な手段で所望の特性を持つ線材が得られることを
特徴とする新規な超電導材の製造方法に関する。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for producing an oxide superconducting wire having a high critical current density, and more specifically, to obtain desired characteristics by a simple means of high-frequency heating treatment. The present invention relates to a method for manufacturing a novel superconducting material, which is characterized in that a wire rod having the following properties is obtained.
［従来の技術］
従来、超電導線材を製造する代表的な方法として、以下
に示す３つの方法が知られている。[Prior Art] Conventionally, the following three methods are known as typical methods for manufacturing superconducting wires.
第１の方法は、まず超電動体原料酸化物の粉末または超
電動体の粉末を銀あるいは金等の延性の高い金属の中空
板またはパイプに充鎮し、次いで板に付いては圧延によ
り、またバイブについてはダイスを使った引き抜きによ
って前記金属の板またパイプごと引き伸ばして細い線材
にし、その後炉内でアニール処理を施すことによって中
空板内部またはパイプ内部の粉末の粒子相互を焼結させ
て、超電導線材とする方法である。The first method is to first fill a hollow plate or pipe of a highly ductile metal such as silver or gold with superelectric body raw material oxide powder or superelectric body powder, and then attach the plate to the plate by rolling. Regarding the vibrator, the metal plate or pipe is drawn using a die to be drawn into a thin wire, and then annealed in a furnace to sinter the powder particles inside the hollow plate or pipe. This is a method for making superconducting wires.
第２の方法は、酸化物系超電導体組成物の溶融体を所定
の成形型に入れて急冷することにより、ガラス化した線
状体を形成し、この線状体を炉内でアニール処理するこ
とによって結晶化を図り、超電導線材とする方法である
。The second method is to form a vitrified linear body by placing a melt of the oxide superconductor composition in a predetermined mold and rapidly cooling it, and then annealing this linear body in a furnace. In this method, the superconducting wire is made into a superconducting wire by crystallizing the superconducting wire.
第３の方法は、懸濁紡糸法である。この方法は、超電導
体原料酸化物の粉末あるいは超電導体の粉末を水中に分
散させた水性懸濁液をポリビニルアルコール水溶液中に
加えて紡糸ドーブとし、この紡糸ドーブをＮａＯＨとＮ
ａ Ｓ ０ ４との混合水溶液からなる沈澱浴中に押
し出して、繊維状の素材を得た後、この繊維状の素材を
水洗乾燥させ、その後に適当な熱処理を炉内で行うこと
によって、超電導体の繊維とする方法である。The third method is suspension spinning. In this method, an aqueous suspension of superconductor raw material oxide powder or superconductor powder dispersed in water is added to an aqueous polyvinyl alcohol solution to form a spinning dove, and this spinning dove is mixed with NaOH and N
Superconductivity This is a method to make it into the body's fibers.
［発明が解決しようとする課題］
しかしながら上記従来法にはいずれも次のような欠点が
ある。まず、第１の方法では、中空の板やバイブ等の銀
系シース材の内部でＹ系酸化物超電導粉を焼結させても
、臨海電流密度（Ｊ ｃ）が２００７ｃｍ２程度と低く
、Ｊｃの数値をそれ以上に高めることは困難である。ま
た、第２の方法では、線材の長さが使用する成形型の長
さによって決まるため、最終的に得られる線材の長さを
長くすることは難しい。[Problems to be Solved by the Invention] However, all of the above conventional methods have the following drawbacks. First, in the first method, even if the Y-based oxide superconducting powder is sintered inside a silver-based sheath material such as a hollow plate or a vibrator, the critical current density (J c ) is as low as about 2007 cm2, and the J c It is difficult to increase the number beyond that. Furthermore, in the second method, since the length of the wire is determined by the length of the mold used, it is difficult to increase the length of the wire finally obtained.
一方、第３の方法の場合は、原理的には長尺の超電導線
材を得ることができるが、ポリビニルアルコール等の有
機材料で成形しているために、水洗乾燥処理を経てもカ
ーボンの残留をなくすことが困難で、残留したカーボン
が後の熱処理時に超電導体の酸化物原料と反応すること
などから、該方法によって得た超電導線材は、電流密度
が小さくなったり、あるいは電流密度にばらつきが発生
するという問題があった。On the other hand, in the case of the third method, a long superconducting wire can be obtained in principle, but since it is molded from an organic material such as polyvinyl alcohol, no carbon remains even after washing and drying. Because it is difficult to eliminate carbon and the remaining carbon reacts with the oxide raw material of the superconductor during subsequent heat treatment, superconducting wires obtained by this method have low current density or variations in current density. There was a problem.
従って長尺の超電導線材の製造に適し、かつ、製造工程
中にカーボンの残留が発生せず、カーボンの残留に起因
した電流密度の低下といった不都合が生じない新規な超
電導線材の製造方法の開発が求められていた。Therefore, it is necessary to develop a new method for producing superconducting wires that is suitable for producing long superconducting wires, does not leave carbon residue during the production process, and does not cause problems such as a decrease in current density due to carbon residue. It was wanted.
［課題が解決するための手段］
本発明者らは、斯る課題を解決するために鋭意研究した
ところ、超電導線材の製造工程で高周波加熱処理を行う
ことによって、臨界電流密度の高い酸化物超電導線材を
製造できることを見い出した。[Means for Solving the Problems] In order to solve the problems, the present inventors conducted intensive research and found that by performing high-frequency heat treatment in the manufacturing process of superconducting wires, oxide superconductors with high critical current density can be produced. We discovered that it is possible to manufacture wire rods.
すなわち本発明は、銀または銀合金等の銀系シース祠（
パイプや中空の板など）に酸化物超電導体粉末を詰めて
伸線処理を行ってシース線を作製した後、得られたシー
ス線を高周波加熱処理して臨界電流密度の高い酸化物超
電導線材を得ることを特徴とする新規な酸化物超電導線
の製造方法を提供するものである。That is, the present invention provides silver-based sheathed shrines (such as silver or silver alloys).
After filling a pipe, hollow plate, etc. with oxide superconductor powder and drawing it to create a sheathed wire, the resulting sheathed wire is subjected to high-frequency heat treatment to produce an oxide superconducting wire with a high critical current density. The present invention provides a novel method for producing an oxide superconducting wire, which is characterized by obtaining the following.
［作 用］
？発明で使用するための原料は、たとえば次のようにし
て製造できる。すなわち、予めＹ２０３、ＢａＣＯ，お
よびＣｕＯの各粉末を２：ｌ：ｌの割合で混合し、焼成
して焼結体を得た後、粉砕してＹ２ Ｂ ａ ＋ Ｃ
ｕ ＋ Ｏ，の粉を製造する。一方、ＢａＯとＣｕＯの
各粉末を３＝５の割合で混合し、焼成して得た焼結体を
粉砕して別の焼成粉末を製造する。[Effect]? Raw materials for use in the invention can be produced, for example, as follows. That is, Y203, BaCO, and CuO powders were mixed in advance at a ratio of 2:1:1, fired to obtain a sintered body, and then crushed to form Y2 Ba + C.
A powder of u + O is produced. On the other hand, BaO and CuO powders are mixed in a ratio of 3=5, and the sintered body obtained by firing is crushed to produce another fired powder.
これらの粉末を所定の割合で混合して原料用混合粉末と
する。このようにして得られた混合粉末を、銀一白金パ
イプのような融点の高い材質からなるパイプに入れ、こ
れをパイプごと伸線器で処理して適当なシース線とし、
次いで得られたシース線をゾーンメルティング装置内に
セットして、温度勾配を掛けながら包晶反応を行い、銀
一白金線に沿った方向で結晶成長を行わせて組成Ｙ１Ｂ
ａ２Ｃｕ．０■一．の超伝導線材を得ることができる。These powders are mixed at a predetermined ratio to form a mixed powder for raw materials. The mixed powder thus obtained is put into a pipe made of a material with a high melting point, such as a silver-platinum pipe, and the pipe is treated with a wire drawing machine to form a suitable sheath wire.
Next, the obtained sheath wire was set in a zone melting device, and a peritectic reaction was performed while applying a temperature gradient, and crystal growth was performed in the direction along the silver-platinum wire, resulting in composition Y1B.
a2Cu. 0■1. superconducting wire can be obtained.
あるいは、Ｙ １ Ｂ ａ ２ Ｃ ｕ３ ０ ｒ−ｘ
の原料粉末を銀一白金バイブに詰め込み、ゾーンメルテ
ィング装置で銀一白金（１０ ａｇｏ一％）パイプの融
点近くに加温し、パイプ中のＹ ＩＢ ａ ２ Ｃ ｕ
３ ０ ｔ−Ｍゐ分解してＹ，Ｂａ，Ｃｕ，０，と液
相とに成し、これに温度勾配を掛けながら包晶反応を行
わせて、Ｙ １ Ｂ ａ ２ Ｃ ｕ ｇ Ｏ ｔ−ｘ
の結晶配向を有する超電導線材を得ることができる。Or Y 1 B a 2 Cu3 0 r-x
The raw material powder of Y IB a 2 Cu in the pipe was packed into a silver-platinum vibrator and heated in a zone melting device to near the melting point of a silver-platinum (10 ago 1%) pipe.
30 t-M is decomposed to form Y, Ba, Cu, 0, and a liquid phase, and a peritectic reaction is performed while applying a temperature gradient to yield Y 1 Ba 2 Cu g O t -x
It is possible to obtain a superconducting wire having a crystal orientation of
これらの方法によって得られる酸化物超電導線材の臨界
電流密度（Ｊ ｃ）は、従来法によって得られる線材に
比し改善された値を有するものであることを確認できた
。It was confirmed that the critical current density (Jc) of the oxide superconducting wire obtained by these methods has an improved value compared to the wire obtained by the conventional method.
以下、実施例により詳細に説明する。Hereinafter, it will be explained in detail using examples.
［実施例１〕
Ｙｚ Ｏ＊ 、ＢａＣＯｓおよびＣｕＯの平均粒径８μ
−の各粉末をＹ：Ｂａ：Ｃｕ＝２： １： １に混合し
、これを成型後９５０℃にて２０時間、酸素雰囲気中で
焼成して焼結体を得た。次いで得られた焼結体を粉砕し
て篩別し、平均粒径３１ＩＩａのＹ２Ｂａ＋ Ｃｕ１
ｏ，の粉末を得た。[Example 1] Average particle size of YzO*, BaCOs and CuO 8μ
- were mixed in a ratio of Y:Ba:Cu=2:1:1, and after molding, the mixture was fired at 950° C. for 20 hours in an oxygen atmosphere to obtain a sintered body. Next, the obtained sintered body was crushed and sieved to yield Y2Ba+Cu1 with an average particle size of 31IIa.
o, powder was obtained.
次にＢａＯとＣｕＯの平均粒径３伽の各粉末をＢａ：Ｃ
ｕ−８：５の割合に混合し、これを成型後８５０℃にて
２０時間、酸素雰囲気中で焼成して焼結体を得、次いで
これらの焼結体を粉砕して篩別し、平均粒径３鵬の粉末
を得た。Next, each powder of BaO and CuO with an average particle size of 3.
U-8:5 ratio was mixed, and after molding, this was fired at 850°C for 20 hours in an oxygen atmosphere to obtain a sintered body.Then, these sintered bodies were crushed and sieved, and the average A powder with a particle size of 3 was obtained.
上記の２種の粉末をＹ：Ｂａ：Ｃｕ−１： ２：３にな
るように混合し、これらの粉末を外径５−１０、内径４
ＩＩＩＩＩＯ、長さＩＯｃｍの銀一白金（ＰｔｌＯ％）
製のパイプに詰め込み、伸線器で処理して外径５ｌＩＩ
ＩＯの銀糸のシース線を作製した。The above two types of powders were mixed in a ratio of Y:Ba:Cu-1: 2:3, and these powders had an outer diameter of 5-10 and an inner diameter of 4.
IIIIO, silver and platinum (PtlO%) with length IO cm
It is packed into a made-in-trade pipe and processed with a wire drawer to reduce the outer diameter to 5lII.
A sheathed wire of IO silver thread was prepared.
得られたシース線をゾーンメルティング装置で処理して
高周波加熱を行った。この場合の加熱部の移動速度はｌ
ｅＩＩ／ｈｒとした。The obtained sheath wire was treated with a zone melting device and subjected to high frequency heating. In this case, the moving speed of the heating section is l
It was set as eII/hr.
その結果得られた酸化物超電導線材のＴｃおよびＪｃを
測定したところ、Ｔｃは９０ｋ，Ｊｃは１０３Ａ／ｃｍ
２であった。When Tc and Jc of the resulting oxide superconducting wire were measured, Tc was 90k and Jc was 103A/cm.
It was 2.
また、該線材を切断して内部をＸ線回折で調べたところ
、長手力向にＣ軸が成長していることがわかった。Furthermore, when the wire was cut and the inside was examined by X-ray diffraction, it was found that the C-axis grew in the longitudinal direction.
［実施例２］
銀一白金パイプに詰め込む粉末としてＹＢａ２（：ｕ３
０７−ｗの平均粒径３血の粉末のみを用いて、実施例１
と同様に銀一白金（ Ｐ ｔ ｌＯａｔｏＩ１％）製の
パイプに詰め込み、仲線器で外径５＋ｍσの銀系のシー
ス線を製造した。[Example 2] YBa2(:u3) was used as a powder to be packed into a silver-platinum pipe.
Example 1 using only the average particle size 3 blood powder of 07-w
Similarly, it was packed into a pipe made of silver and platinum (PtlOatoI1%), and a silver-based sheath wire with an outer diameter of 5+mσ was manufactured using a Nakasen machine.
得られたシース線を実施例１に示すゾーンメルティング
装置で同処理を施した結果、得られた酸化物超電導線材
のＴｃは９０ｋ％Ｊｃは５Ｘｌ０２Ａ／Ｃ−２であった
。The obtained sheath wire was subjected to the same treatment using the zone melting apparatus shown in Example 1, and as a result, the obtained oxide superconducting wire had a Tc of 90 k% and a Jc of 5Xl02A/C-2.
［実施例３］
銀一白金パイプに詰め込む粉末として７４７２Ｂ ａ
２ Ｃ ｕ ３ ０ｍの平均粒径３−の粉末のみを用い
たこと以外は、実施例１と同様にして得た酸化物超電導
線材について、同様の方法で測定を行ったところ、Ｔｃ
はｌｌ５ｋ， Ｊ ｃは２０ＯＡ／Ｃｍ’であった。[Example 3] 7472B a as a powder packed into a silver-platinum pipe
The oxide superconducting wire obtained in the same manner as in Example 1 was measured in the same manner as in Example 1, except that only powder with an average particle size of 3-2 Cu 30 m was used, and it was found that Tc
was 115k, and Jc was 20OA/Cm'.
［比較例１］
実施例２で得られた０．５＋ｕ３ＣＩの銀一白金のシー
ス線を高周波処理することなく、従来法に従って単に９
６０℃にて２０時間、酸素雰囲気で焼成して得た酸化雰
囲気で焼成して得た酸化物超電導線材は、Ｔｃが９０ｋ
，Ｊｃは２００／ｃｓ２であった。[Comparative Example 1] The 0.5+u3CI silver-platinum sheathed wire obtained in Example 2 was simply treated with 90% according to the conventional method without high-frequency treatment.
The oxide superconducting wire obtained by firing in an oxidizing atmosphere obtained by firing at 60°C for 20 hours in an oxygen atmosphere has a Tc of 90k.
, Jc was 200/cs2.
［発明の効果］
上述のように本発明法では、銀または銀合金のシースバ
イプあるいはシース板の中に酸化物超電導体の粉末を詰
め込んてシース線を得、次いで高周波加熱装置として例
えばゾーンメルテイング装置等を用いて処理するため、
銀系シースノ々イブあるいは銀系シース板が加熱される
ことによってその内部に充填された酸化物超電導体粉末
が端から順に焼結されていくため、従来法のような断線
がなく、また、比較的に結晶配向が容易となり、その結
果、高いＪｃ値を有する超電導線を比較的簡易な手段で
得ることができるという効果がある。[Effects of the Invention] As described above, in the method of the present invention, a sheathed wire is obtained by packing oxide superconductor powder into a sheathed pipe or sheathed plate made of silver or silver alloy, and then a high-frequency heating device such as a zone melting device is used. For processing using etc.,
As the silver-based sheath snowboard or silver-based sheath plate is heated, the oxide superconductor powder filled inside it is sintered sequentially from the edge, so there is no disconnection as with conventional methods, and it is more Therefore, crystal orientation becomes easier, and as a result, there is an effect that a superconducting wire having a high Jc value can be obtained by a relatively simple means.
Claims (1)
線処理を行うことにより得られたシース線を、高周波加
熱することからなる臨界電流密度の高い酸化物超電導線
材の製造方法。A method for manufacturing an oxide superconducting wire with high critical current density, which comprises high-frequency heating of a sheathed wire obtained by filling a silver-based sheath material with oxide superconducting powder and performing a wire drawing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01150790A JP3179084B2 (en) | 1990-01-20 | 1990-01-20 | Manufacturing method of oxide superconducting wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01150790A JP3179084B2 (en) | 1990-01-20 | 1990-01-20 | Manufacturing method of oxide superconducting wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03216919A true JPH03216919A (en) | 1991-09-24 |
| JP3179084B2 JP3179084B2 (en) | 2001-06-25 |
Family
ID=11779936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01150790A Expired - Fee Related JP3179084B2 (en) | 1990-01-20 | 1990-01-20 | Manufacturing method of oxide superconducting wire |
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| Country | Link |
|---|---|
| JP (1) | JP3179084B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6604273B1 (en) * | 1994-09-30 | 2003-08-12 | Canon Kabushiki Kaisha | Method of manufacturing an oxide superconducting wire |
-
1990
- 1990-01-20 JP JP01150790A patent/JP3179084B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6604273B1 (en) * | 1994-09-30 | 2003-08-12 | Canon Kabushiki Kaisha | Method of manufacturing an oxide superconducting wire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3179084B2 (en) | 2001-06-25 |
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