JPH05170553A - Production of large-sized oxide superconductor - Google Patents
Production of large-sized oxide superconductorInfo
- Publication number
- JPH05170553A JPH05170553A JP3337193A JP33719391A JPH05170553A JP H05170553 A JPH05170553 A JP H05170553A JP 3337193 A JP3337193 A JP 3337193A JP 33719391 A JP33719391 A JP 33719391A JP H05170553 A JPH05170553 A JP H05170553A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- material powder
- superconductor
- producing
- 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.)
- Pending
Links
- 239000002887 superconductor Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 5
- 238000010791 quenching Methods 0.000 claims abstract 2
- 230000000171 quenching effect Effects 0.000 claims abstract 2
- 238000001816 cooling Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 claims 2
- 238000000748 compression moulding Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- UPIXZLGONUBZLK-UHFFFAOYSA-N platinum Chemical compound [Pt].[Pt] UPIXZLGONUBZLK-UHFFFAOYSA-N 0.000 claims 1
- 238000010298 pulverizing process Methods 0.000 claims 1
- 229910001923 silver oxide Inorganic materials 0.000 claims 1
- 238000005339 levitation Methods 0.000 abstract description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 5
- 229910052697 platinum Inorganic materials 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 4
- 239000010949 copper Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract 2
- 230000002706 hydrostatic effect Effects 0.000 abstract 2
- 238000001354 calcination Methods 0.000 abstract 1
- 125000002091 cationic group Chemical group 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 229910000108 silver(I,III) oxide Inorganic materials 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000003826 uniaxial pressing Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 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
- 239000013590 bulk material Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
Description
【０００１】本発明は、バルク（塊）状の酸化物超電導
体の製造方法に関し、特に、磁気浮上によるフライホイ
ールや磁気軸受等への利用を目的とした大形酸化物超電
導体の製造方法に関するものである。The present invention relates to a method for producing a bulk oxide superconductor, and more particularly to a method for producing a large oxide superconductor for use in flywheels, magnetic bearings, etc. by magnetic levitation. It is a thing.
【０００２】[0002]
【従来の技術】従来、例えば、ＹＢａＣｕＯ系の酸化物
超電導体では、溶融状態から超電導相を生成させること
によって、高い臨界電流密度と強力な磁気浮上力が得ら
れるようになってきており、フライホイールや磁気軸受
等への利用にその応用研究が行われている。2. Description of the Related Art Conventionally, for example, in a YBaCuO-based oxide superconductor, it has been possible to obtain a high critical current density and a strong magnetic levitation force by generating a superconducting phase from a molten state. Applied research is being conducted for use in wheels and magnetic bearings.
【０００３】また、この超電導体の成型には、図３に示
すように、一軸プレス装置１が用いられている。この一
軸プレス装置１の下型２に供給された原料粉Ｃ１は、上
型３からの所定の圧力（例えば、１，０００Ｋｇｆ／ｃ
ｍ2）（ｋｇｆ＝キログラム重）により圧縮された後、
圧縮後の成型体Ｃ２を半溶融熱処理装置４により熱処理
することにより、直径３ｃｍ、厚さ１ｃｍ程度の円柱状
の超電導体Ｃ３を製造している。尚、これらの超電導体
Ｃ３の磁気浮上力は４〜８ｋｇｆ程度に設定されてい
る。Further, as shown in FIG. 3, a uniaxial press machine 1 is used for molding the superconductor. The raw material powder C1 supplied to the lower mold 2 of the uniaxial pressing device 1 is at a predetermined pressure (for example, 1,000 Kgf / c) from the upper mold 3.
m 2 ) (kgf = kilogram weight),
By heat-treating the compacted body C2 after compression by the semi-molten heat treatment apparatus 4, a cylindrical superconductor C3 having a diameter of 3 cm and a thickness of about 1 cm is manufactured. The magnetic levitation force of these superconductors C3 is set to about 4 to 8 kgf.
【０００４】[0004]
【発明が解決しようとする課題】ところで、このような
酸化物超電導体を今後、軸受型フライホイールや磁気軸
受等の実用品に応用していくためには、大形で、しか
も、磁気浮上力の強い超電導体が要望されている。By the way, in order to apply such oxide superconductors to practical products such as bearing type flywheels and magnetic bearings in the future, they are large and have a magnetic levitation force. There is a demand for a strong superconductor.
【０００５】例えば、図２は、超電導体の厚さと磁気浮
上力の関係を直径１７ｍｍの円柱状超電導体を用いて示
した一例のグラフである。このグラフに示すように、強
い磁気浮上力を得るためには、ある一定以上の厚み（図
１の場合は１５ｍｍ以上）が必要になってくる。また、
安定した磁気浮上力を得るためにも所定以上の厚さが必
要となる。For example, FIG. 2 is a graph showing an example of the relationship between the thickness of the superconductor and the magnetic levitation force using a cylindrical superconductor having a diameter of 17 mm. As shown in this graph, in order to obtain a strong magnetic levitation force, a certain thickness or more (15 mm or more in the case of FIG. 1) is required. Also,
In order to obtain a stable magnetic levitation force, a certain thickness or more is required.
【０００６】さらに、超電導体を種々の産業用部品とし
て使用する場合には、立体的な（三次元の）形状が要求
されるようになり、所定の表面積と厚みをもった超電導
バルク材が必要となる。Furthermore, when the superconductor is used as various industrial parts, a three-dimensional (three-dimensional) shape is required, and a superconducting bulk material having a predetermined surface area and thickness is required. Becomes
【０００７】しかしながら、従来の方法で大形の超電導
体を製造した場合には、成型時に超電導体の内部に不均
一な圧力が生じる。その結果、半溶融熱処理した段階
で、加圧方向に垂直な面に沿って割れ５が発生し易く、
直径が大きく、且つ厚い超電導体Ｃ３を製造することは
できないという問題があった。However, when a large-sized superconductor is manufactured by the conventional method, nonuniform pressure is generated inside the superconductor during molding. As a result, at the stage of the semi-molten heat treatment, cracks 5 are likely to occur along the plane perpendicular to the pressing direction,
There is a problem that it is not possible to manufacture a superconductor C3 having a large diameter and a large thickness.
【０００８】本発明は、上記実情に鑑み、大形で磁気浮
上力の強い超電導体を割れや変形のない安定した状態で
製造することができる大形酸化物超電導体の製造方法を
提供することを目的とするものである。In view of the above situation, the present invention provides a method for producing a large oxide superconductor capable of producing a large superconductor having a strong magnetic levitation force in a stable state without cracking or deformation. The purpose is.
【０００９】[0009]
【課題を解決するための手段】この目的を達成するため
に、請求項１に記載の発明は、酸化超電導体を生成する
ための原料粉を等方加圧処理装置により所定形状に圧縮
成型した後、半溶融熱処理により超電導相を成長させる
ことを要旨とする。In order to achieve this object, in the invention described in claim 1, the raw material powder for producing an oxidized superconductor is compression molded into a predetermined shape by an isotropic pressure processing apparatus. After that, the gist is to grow the superconducting phase by a semi-melting heat treatment.
【００１０】[0010]
【作用】このような方法によれば、等方加圧処理を行う
ことにより原料粉の加圧が均等に行なわれて割れのない
大形超電導体を製造することができる。According to such a method, it is possible to manufacture a large-sized superconductor without cracks by uniformly pressing the raw material powder by performing the isotropic pressure treatment.
【００１１】また、等方加圧処理を行うことにより緻密
な成型体が得られるため、半溶融熱処理後の超電導体の
変形がほとんどない。Further, since a dense molded body can be obtained by carrying out the isotropic pressure treatment, there is almost no deformation of the superconductor after the semi-molten heat treatment.
【００１２】[0012]
【実施例】以下、本発明の実施例を図１に基づいて説明
する。図１は、本発明の大形酸化物超電導体の製造方法
を段階的に示す説明図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an explanatory view showing stepwise a method for producing a large oxide superconductor according to the present invention.
【００１３】図１において、１１は原料粉Ｓ１が供給さ
れる下型１２と、原料粉Ｓ１を所定の圧力（例えば、５
トン（１００Ｋｇｆ））により圧縮する上型１３とを備
えた円柱型の一軸プレス装置である。In FIG. 1, reference numeral 11 denotes a lower mold 12 to which the raw material powder S1 is supplied, and the raw material powder S1 at a predetermined pressure (for example, 5).
This is a cylindrical uniaxial pressing device provided with an upper mold 13 that is compressed by tons (100 Kgf).
【００１４】原料粉Ｓ１は、Ｙ2０3，ＢａＣＯ3，Ｃｕ
Ｏの陽イオンの比が１．８：２．４：３．４となるよう
に混合し、９２０℃で１２時間仮焼した後、粉砕したも
のを白金るつぼに入れ、さらに、１４００℃で２０分間
加熱して銅製のハンマーを用いて急冷した。そして、こ
の急冷してできた塊を再び粉砕して１ｍｍ以下の粒径と
し、Ａｇ2Ｏを粉砕粉に対して１０ｗｔ％（重量パーセ
ント）添加し、粉が緻密にかつ均一分散するまでよく粉
砕混合したものが使用されている。The raw material powder S1 is composed of Y 2 O 3 , BaCO 3 and Cu.
The mixture was mixed so that the ratio of O cations was 1.8: 2.4: 3.4, calcined at 920 ° C. for 12 hours, and then ground into a platinum crucible and further heated at 1400 ° C. for 20 hours. It was heated for 1 minute and quenched with a copper hammer. Then, the rapidly cooled lumps are crushed again to a particle size of 1 mm or less, 10 wt% (weight percent) of Ag 2 O is added to the crushed powder, and the powder is crushed well until the powder is densely and uniformly dispersed. A mixture is used.
【００１５】下型１２に供給（例えば５００ｇ）された
原料粉Ｓ１は、上型１３の加圧により直径８０ｍｍ高さ
３０ｍｍの円板状に仮成型された予備成型体Ｓ２とな
る。The raw material powder S1 supplied (for example, 500 g) to the lower mold 12 becomes a preformed body S2 which is temporarily molded into a disk shape having a diameter of 80 mm and a height of 30 mm by pressing the upper mold 13.
【００１６】この成型体Ｓ２の形状は特に限定されるも
のではないが、厚さが１５ｍｍ以上のものにおいて、後
述の等方加圧処理の効果が等しい。そして、この予備成
型体Ｓ２は、図示外のゴム製氷のうに入れられて真空ポ
ンプで脱気された後、等方加圧成型装置１４の所定の圧
力（例えば、２０００Ｋｇｆ／ｃｍ2）により成型体Ｓ
３とされた後、半溶融熱処理装置１５により処理され
る。The shape of the molded body S2 is not particularly limited, but if the thickness is 15 mm or more, the effect of the isotropic pressure treatment described later is equal. Then, the preformed body S2 is put into a rubber ice cube (not shown) and deaerated by a vacuum pump, and then the preformed body is formed by a predetermined pressure of the isotropic pressure molding device 14 (for example, 2000 Kgf / cm 2 ). S
After being set to 3, it is processed by the semi-molten heat treatment apparatus 15.
【００１７】半溶融熱処理装置１５では、例えば、アル
ミナボード（図示せず）の上にＰｔ線（プラチナ（白
金））をひき、その上に成型体Ｓ３を乗せて１１００℃
で加熱して３０分間保持した後、１０１０℃まで１０分
間で冷却してから、１℃／ｈ（時）で８５０℃まで冷却
した後、炉冷した。更に、酸素を付加するために、酸素
気流中で６００℃から４００℃の温度で約５０時間加熱
後炉冷することにより、割れや変形のない直径６７ｍ
ｍ、厚さ２４ｍｍの円板状の酸化物超電導体Ｓ４が製造
される。この酸化物超電導体Ｓ４を液体窒素で冷却し、
直径７２ｍｍ、表面磁束密度０．４５Ｔ（テスラ＝１
０，０００ガウス）の永久磁石を用いて測定した磁気浮
上力は、１３Ｋｇｆであった。In the semi-molten heat treatment apparatus 15, for example, a Pt wire (platinum (platinum)) is drawn on an alumina board (not shown), the molded body S3 is placed thereon, and the temperature is 1100 ° C.
After heating for 10 minutes at 10 ° C., cooling to 1010 ° C. in 10 minutes, cooling to 850 ° C. at 1 ° C./h (hour), and then furnace cooling. Furthermore, in order to add oxygen, by heating in an oxygen stream at a temperature of 600 ° C. to 400 ° C. for about 50 hours and then cooling the furnace, a diameter of 67 m without cracking or deformation
A disc-shaped oxide superconductor S4 having a thickness of m and a thickness of 24 mm is manufactured. This oxide superconductor S4 is cooled with liquid nitrogen,
Diameter 72mm, surface magnetic flux density 0.45T (Tesla = 1
The magnetic levitation force measured using a permanent magnet of 10,000 gauss) was 13 Kgf.
【００１８】ところで、この半溶融熱処理装置１５は、
Ｐｔ線を使用せずにアルミナボートの上で成型体Ｓ３を
直接熱処理するようにしてもよい。By the way, the semi-molten heat treatment apparatus 15 is
The molded body S3 may be directly heat-treated on an alumina boat without using the Pt wire.
【００１９】この方法では、酸化物超電導体Ｓ４がアル
ミによって汚染されるため、超電導特性が若干低下する
ものの、高価なＰｔ線を使用しないため、経済性に優れ
た製造方法とすることができる。According to this method, the oxide superconductor S4 is contaminated with aluminum, so that the superconducting property is slightly deteriorated, but an expensive Pt wire is not used, so that the manufacturing method is excellent in economic efficiency.
【００２０】また、一軸プレス装置１１は角柱型の金型
を使用することにより、一辺が４３ｍｍ、厚さ１９ｍｍ
の角柱の超電導体を製造し、この超電導体を液体窒素で
冷却しても良い。このとき、直径３２ｍｍ、表面磁束密
度０．５０Ｔの永久磁石を用いて測定した超電導体の磁
気浮上力は７Ｋｇｆであった。この角柱超電導体を複数
密を組み合せることにより、大きな磁気浮上力を得るこ
とができる。Further, the uniaxial pressing device 11 uses a prismatic mold so that one side is 43 mm and the thickness is 19 mm.
It is also possible to manufacture a rectangular column superconductor and to cool this superconductor with liquid nitrogen. At this time, the magnetic levitation force of the superconductor measured using a permanent magnet having a diameter of 32 mm and a surface magnetic flux density of 0.50 T was 7 Kgf. A large magnetic levitation force can be obtained by combining a plurality of prismatic superconductors densely.
【００２１】[0021]
【発明の効果】本発明によれば、以上説明したことによ
り、大形で磁気浮上力の強い超電導体を割れや変形のな
い安定した状態で製造することができる。As described above, according to the present invention, a large-sized superconductor having a strong magnetic levitation force can be manufactured in a stable state without cracking or deformation.
【図１】本発明の大形酸化物超電導体の製造方法を段階
的にしめす説明図である。FIG. 1 is an explanatory view showing stepwise a method for producing a large oxide superconductor according to the present invention.
【図２】超電導体の厚さと磁気浮上力の関係を示すグラ
フである。FIG. 2 is a graph showing the relationship between the thickness of the superconductor and the magnetic levitation force.
【図３】従来の大形酸化物超電導体の製造方法を段階的
に示す説明図である。FIG. 3 is an explanatory view showing step by step a conventional method for producing a large oxide superconductor.
Ｓ１…原料粉 Ｓ４…酸化物超電導体 １４…等方加圧処理装置 １５…半溶融熱処理 S1 ... Raw material powder S4 ... Oxide superconductor 14 ... Isotropic pressure treatment device 15 ... Semi-melt heat treatment
───────────────────────────────────────────────────── フロントページの続き (71)出願人 000006655 新日本製鐵株式会社 東京都千代田区大手町２丁目６番３号 (72)発明者 高市 浩 東京都江東区東雲１−14−３ 財団法人国 際超電導産業技術研究センター 超電導工 学研究所内 (72)発明者 近藤 章弘 東京都江東区東雲１−14−３ 財団法人国 際超電導産業技術研究センター 超電導工 学研究所内 (72)発明者 村上 雅人 東京都江東区東雲１−14−３ 財団法人国 際超電導産業技術研究センター 超電導工 学研究所内 (72)発明者 腰塚 直己 東京都江東区東雲１−14−３ 財団法人国 際超電導産業技術研究センター 超電導工 学研究所内 (72)発明者 田中 昭二 東京都江東区東雲１−14−３ 財団法人国 際超電導産業技術研究センター 超電導工 学研究所内 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 000006655 Nippon Steel Corporation 2-3-6 Otemachi, Chiyoda-ku, Tokyo (72) Inventor Hiroshi Takaichi 1-14-3 Shinonome, Koto-ku, Tokyo Foundation International Superconductivity Industrial Technology Research Center Superconductivity Research Institute (72) Inventor Akihiro Kondo 1-14-3 Shinonome, Koto-ku, Tokyo International Superconductivity Research Institute of Technology Superconductivity Research Institute (72) Inventor Murakami Masato 1-14-3 Shinonome, Koto-ku, Tokyo International Superconductivity Industry Technology Research Center Superconductivity Institute of Technology (72) Inventor Naoki Koshizuka 1-14-3 Shinonome, Koto-ku, Tokyo International Superconductivity Industry Research Institute Center Superconductivity Research Institute (72) Inventor Shoji Tanaka 1-14-3 Shinonome, Koto-ku, Tokyo International Foundation Conducting Industrial Technology Research Center superconducting Engineering Institute in
Claims (6)
を、等方加圧処理装置により所定形状に圧縮成型した
後、半溶融熱処理により超電導相を成長させることを特
徴とする大形酸化物超電導体の製造方法。1. A large oxide characterized by growing a superconducting phase by semi-molten heat treatment after compression molding raw material powder for producing an oxidized superconductor into a predetermined shape by an isotropic pressure treatment device. Superconductor manufacturing method.
を溶融後、急冷し且つ粉砕した粉砕粉であることを特徴
とする請求項１に記載の大形酸化物超電導体の製造方
法。2. The method for producing a large oxide superconductor according to claim 1, wherein the raw material powder is a pulverized powder obtained by melting raw material powder mixed at a predetermined ratio, quenching and pulverizing. ..
にプラチナ（白金）を所定量添加したものであることを
特徴とする請求項１に記載の大形酸化物超電導体の製造
方法。3. The method for producing a large oxide superconductor according to claim 1, wherein the raw material powder is obtained by adding a predetermined amount of platinum (platinum) to the raw material powder mixed at a predetermined ratio. ..
さが１５ｍｍ以上に設定されていることを特徴とする請
求項１に記載の大形酸化物超電導体の製造方法。4. The method for producing a large oxide superconductor according to claim 1, wherein the shape of the raw material powder after compression is set to have a thickness of 15 mm or more.
とを特徴とする請求項１に記載の大形酸化物超電導体の
製造方法。5. The method for producing a large-sized oxide superconductor according to claim 1, wherein the half-melt heat treatment is a step of half-melting followed by gradual cooling.
とを特徴とする請求項２に記載の大形酸化物超電導体の
製造方法。6. The method for producing a large oxide superconductor according to claim 2, wherein a predetermined amount of silver oxide is added to the pulverized powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3337193A JPH05170553A (en) | 1991-12-19 | 1991-12-19 | Production of large-sized oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3337193A JPH05170553A (en) | 1991-12-19 | 1991-12-19 | Production of large-sized oxide superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05170553A true JPH05170553A (en) | 1993-07-09 |
Family
ID=18306323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3337193A Pending JPH05170553A (en) | 1991-12-19 | 1991-12-19 | Production of large-sized oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05170553A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0256814A (en) * | 1988-08-23 | 1990-02-26 | Toshiba Corp | Manufacture of superconductor parts |
| JPH02258668A (en) * | 1989-03-31 | 1990-10-19 | Kokusai Chiyoudendou Sangyo Gijutsu Kenkyu Center | Production of oxide superconductor |
| JPH02258667A (en) * | 1989-03-31 | 1990-10-19 | Kokusai Chiyoudendou Sangyo Gijutsu Kenkyu Center | Production of oxide superconductor |
| JPH03153558A (en) * | 1989-11-08 | 1991-07-01 | Kokusai Chiyoudendou Sangyo Gijutsu Kenkyu Center | Production of oxide superconductor |
| JPH05194094A (en) * | 1990-12-18 | 1993-08-03 | Kiyoyasu Takizawa | Production of oxide superconductor and method for pretreating oxide superconductor using the same method |
-
1991
- 1991-12-19 JP JP3337193A patent/JPH05170553A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0256814A (en) * | 1988-08-23 | 1990-02-26 | Toshiba Corp | Manufacture of superconductor parts |
| JPH02258668A (en) * | 1989-03-31 | 1990-10-19 | Kokusai Chiyoudendou Sangyo Gijutsu Kenkyu Center | Production of oxide superconductor |
| JPH02258667A (en) * | 1989-03-31 | 1990-10-19 | Kokusai Chiyoudendou Sangyo Gijutsu Kenkyu Center | Production of oxide superconductor |
| JPH03153558A (en) * | 1989-11-08 | 1991-07-01 | Kokusai Chiyoudendou Sangyo Gijutsu Kenkyu Center | Production of oxide superconductor |
| JPH05194094A (en) * | 1990-12-18 | 1993-08-03 | Kiyoyasu Takizawa | Production of oxide superconductor and method for pretreating oxide superconductor using the same method |
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