JPH02258668A - Production of oxide superconductor - Google Patents
Production of oxide superconductorInfo
- Publication number
- JPH02258668A JPH02258668A JP1078458A JP7845889A JPH02258668A JP H02258668 A JPH02258668 A JP H02258668A JP 1078458 A JP1078458 A JP 1078458A JP 7845889 A JP7845889 A JP 7845889A JP H02258668 A JPH02258668 A JP H02258668A
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- pellet
- silver
- liquid phase
- 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 17
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910052709 silver Inorganic materials 0.000 claims abstract description 13
- 239000004332 silver Substances 0.000 claims abstract description 13
- 239000007791 liquid phase Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000008188 pellet Substances 0.000 abstract description 13
- 239000012071 phase Substances 0.000 abstract description 11
- 239000013078 crystal Substances 0.000 abstract description 7
- 238000003825 pressing Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は酸化物超電導体の製造方法に関し、特に臨界電
流密度の高い酸化物超電導体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 manufacturing an oxide superconductor, and particularly to a method for manufacturing an oxide superconductor having a high critical current density.
酸化物超電導体の臨界電流密度を高めるために、組成の
検討、製造法の検討などがいろいろ試みられている。超
電導酸化物粉末の熱間ブレスもその一つの方法であるが
、これまで極立った改善例は報告されておらず、銀の添
加も試みられているが、銀は結晶粒界の限られた部位に
析出し易く、そのために大きな改善効果が得られない。In order to increase the critical current density of oxide superconductors, various attempts have been made to examine compositions and manufacturing methods. Hot pressing of superconducting oxide powder is one method, but no significant improvements have been reported so far.Addition of silver has also been attempted, but silver has limited crystal grain boundaries. It tends to precipitate in certain areas, and therefore no significant improvement effect can be obtained.
酸化物超電導体の臨界電流密度は１０’＾／ｃｍ’の程
度にとどまっている。The critical current density of oxide superconductors remains on the order of 10'^/cm'.
（発明が解決しようとする課題〕
本発明は、このような従来の欠点を克服し、臨界電流密
度が著しく改善された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。(Problems to be Solved by the Invention) An object of the present invention is to overcome such conventional drawbacks and provide a method for producing an oxide superconductor in which the critical current density is significantly improved.
（課題を解決するための手段）
本発明は、銀を含む酸化物超電導材料を半溶融状態にな
るまで加熱しながら加圧して、滲出した液相組成物を除
去する工程を含むことを特徴とする。(Means for Solving the Problems) The present invention is characterized in that it includes a step of heating and pressurizing an oxide superconducting material containing silver until it becomes a semi-molten state, and removing the exuded liquid phase composition. do.
（作 用）
本発明においては、半溶融状態の銀添加超電導酸化物材
料を加圧して、液相の組成物を滲出させ、廃棄する。こ
れによって材料中の非超電導相を除ぎ、かつ結晶配向を
高めることができ、さらに銀を結晶粒界に一様に分散さ
せ、その結果臨界電流密度を高めることができる。(Function) In the present invention, the semi-molten silver-added superconducting oxide material is pressurized to exude the liquid phase composition and discarded. This makes it possible to remove the non-superconducting phase in the material and improve the crystal orientation, and also allows the silver to be uniformly dispersed at the grain boundaries, thereby increasing the critical current density.
以下に、図面を参照して本発明の詳細な説明する。 The present invention will be described in detail below with reference to the drawings.
第１図は本発明を説明するための模式図である。ブレス
１はアンビル２、直径５ＣＩＩ＋のピストン３およびヒ
ータ４を具え、アンビル２上の酸化物超電導材料５を加
熱状態で加圧することができる。ピストン３は圧力制御
装置６によって最高２ｔｏｎまでの圧力を酸化物超電導
材料５に加えることができ、圧力、変位、スピード等は
測定系７によって測定され、かつ表示される。アンビル
２およびピストン３の加圧面は、超電導材料５との反応
を防ぐためにそれぞれ白金板２＾および３＾で覆われて
いる。一方ヒータ４は調節温度計９によって所定の温度
に保たれ、超電導材料５を加熱する。FIG. 1 is a schematic diagram for explaining the present invention. The brace 1 includes an anvil 2, a piston 3 with a diameter of 5 CII+, and a heater 4, and is capable of pressurizing the oxide superconducting material 5 on the anvil 2 in a heated state. The piston 3 can apply a pressure of up to 2 tons to the oxide superconducting material 5 by means of a pressure control device 6, and the pressure, displacement, speed, etc. are measured and displayed by a measuring system 7. The pressurizing surfaces of the anvil 2 and the piston 3 are covered with platinum plates 2^ and 3^, respectively, to prevent reaction with the superconducting material 5. On the other hand, the heater 4 is maintained at a predetermined temperature by a regulating thermometer 9, and heats the superconducting material 5.
加圧雰囲気はＡｒ、０２その他自由に選ぶことができる
。The pressurized atmosphere can be freely selected from Ar, 02, and others.
まず、銀を添加したＢｉ系酸化物超電導材料Ｂｉ、５ｒ
２Ｃａ、Ｃｕ、０．を例にとって説明する。通常の方法
に従って成分調整され、かつ焼成された銀添加Ｂｉ２Ｓ
ｒ、ｌｌ：ａ２ＣｕｓＯ，の焼結ベレット５をアンビル
２上に載せ、９００℃〜１０００℃に加熱して半溶融状
態とする。この際、液相の比率を全体のｌθ〜４０零程
度とするのが望ましい。この状態で圧力制御装置６を動
作させてピストン３を降下させ、酸化物超電導ベレット
５を加圧する。加圧の圧力は、ベレットが粉砕されない
範囲にとどめる。加圧された半溶融ベレットからは液相
組成物１０が滲出して受は皿ｌＯ内に流れ出る。焼結ベ
レット５中には超電導相であるＢｆ２ＳｒｚＣａｚＣｕ
ｓＯ１＋以外の非超電導相が含まれている。この非超電
導相は加熱に際して超電導相より先に溶融し、半溶融状
態のベレット中に液相として存在する。従って加圧によ
って、非超電導相が除去され、超電導相の比率を高める
ことができる。さらに加圧によって結晶を集合組織化し
、配向性を高めることができるので、臨界電流密度を一
層高くすることができる。さらに、通常の方法では銀は
結晶粒界の限られた部位に析出するが、半溶融状態での
加圧によって１０％までの銀は結晶粒界に均一に分散す
る。従フて銀添加の効果を一層高めることができる。銀
添加の有効範囲は２〜１０％である。First, Bi-based oxide superconducting material Bi, 5r added with silver
2Ca, Cu, 0. will be explained using an example. Silver-added Bi2S whose composition was adjusted according to the usual method and fired
A sintered pellet 5 of r, ll: a2CusO is placed on an anvil 2 and heated to 900° C. to 1000° C. to a semi-molten state. At this time, it is desirable that the ratio of the liquid phase is approximately lθ~400. In this state, the pressure control device 6 is operated to lower the piston 3 and pressurize the oxide superconducting pellet 5. The pressure is kept within a range that does not crush the pellets. The liquid phase composition 10 oozes from the pressurized semi-molten pellet and flows into the pan 10. The sintered pellet 5 contains Bf2SrzCazCu, which is a superconducting phase.
Contains non-superconducting phases other than sO1+. This non-superconducting phase melts earlier than the superconducting phase during heating, and exists as a liquid phase in the semi-molten pellet. Therefore, by applying pressure, the non-superconducting phase can be removed and the proportion of the superconducting phase can be increased. Furthermore, since the crystals can be textured and their orientation can be improved by applying pressure, the critical current density can be further increased. Further, in the usual method, silver is precipitated in limited areas at the grain boundaries, but by applying pressure in a semi-molten state, up to 10% of silver is uniformly dispersed at the grain boundaries. Consequently, the effect of silver addition can be further enhanced. The effective range of silver addition is 2-10%.
通常の方法で作製したＢｉ２５ｒ２Ｃａ２Ｃｕ、０．焼
結ベレットの臨界電流密度が１０’＾／ ｃ、ｒａ ’
であるのに対し、銀を２〜ｌＯ％添加したＢｉ２５ｒ２
Ｃａ２Ｃｕ、Ｏ，に上述した半溶融状態での加圧（＾「
雰囲気中）を４回〜６回くり返すことによって１０３〜
１０’Ａ／ｃｍ”の臨界電流密度を得ることができた。Bi25r2Ca2Cu prepared by a normal method, 0. The critical current density of the sintered pellet is 10'^/c, ra'
On the other hand, Bi25r2 with 2~1O% silver added
Pressure is applied to Ca2Cu, O, in the semi-molten state described above (^ "
103~ by repeating (in the atmosphere) 4~6 times
A critical current density of 10'A/cm'' could be obtained.
Ｂｉ２５ｒ２ＣａＣｕ、ＯＸの場合は同じ＜ ９００℃
〜１０００℃に、ＹＢａ２Ｃｕ、、Ｏ，の場合は８８０
〜９６０℃に加熱して液相比がｌθ〜４桟の半溶融状態
を作り、その状態で加圧することによって銀を２〜１０
％まで効果的に添加することができ、かつ液相組成物を
除去することによりて、上述したのと同様の効果を得る
ことができる。Same for Bi25r2CaCu, OX<900℃
~1000℃, 880 for YBa2Cu,,O,
By heating to ~960°C to create a semi-molten state with a liquid phase ratio of lθ~4, and pressurizing in that state, silver is heated to 2~10
%, and by removing the liquid phase composition, effects similar to those described above can be obtained.
（発明の効果）
以上説明したように、本発明によれば半溶融状態の酸化
物超電導体を加圧することによって、非超電導相を除去
し、かつ結晶の配向度を高めることができ、さらに銀添
加の効果をあげることができる。その結果、酸化物超電
導体の臨界電流密度を向上させることができる。(Effects of the Invention) As explained above, according to the present invention, by pressurizing the oxide superconductor in a semi-molten state, it is possible to remove the non-superconducting phase, increase the degree of crystal orientation, and further The effect of addition can be increased. As a result, the critical current density of the oxide superconductor can be improved.
第１図は本発明の詳細な説明するための模式図である。 ・・・プレス機、 ・・・アンビル、 ・・・ピストン、 ・・・ヒータ、 ・・・酸化物超電導材料ベレット。 FIG. 1 is a schematic diagram for explaining the present invention in detail. ...press machine, ...anvil, ···piston, ···heater, ...Oxide superconducting material pellet.
Claims (1)
加熱しながら加圧して、滲出した液相組成物を除去する
工程を含むことを特徴とする酸化物超電導体の製造方法
。1) A method for producing an oxide superconductor, comprising the steps of heating and pressurizing an oxide superconducting material containing silver until it becomes a semi-molten state, and removing exuded liquid phase composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1078458A JPH02258668A (en) | 1989-03-31 | 1989-03-31 | Production of oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1078458A JPH02258668A (en) | 1989-03-31 | 1989-03-31 | Production of oxide superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02258668A true JPH02258668A (en) | 1990-10-19 |
Family
ID=13662589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1078458A Pending JPH02258668A (en) | 1989-03-31 | 1989-03-31 | Production of oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02258668A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05170553A (en) * | 1991-12-19 | 1993-07-09 | Kokusai Chodendo Sangyo Gijutsu Kenkyu Center | Production of large-sized oxide superconductor |
-
1989
- 1989-03-31 JP JP1078458A patent/JPH02258668A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05170553A (en) * | 1991-12-19 | 1993-07-09 | Kokusai Chodendo Sangyo Gijutsu Kenkyu Center | Production of large-sized oxide superconductor |
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