JPH04242019A - Manufacture of oxide superconductive wire rod - Google Patents
Manufacture of oxide superconductive wire rodInfo
- Publication number
- JPH04242019A JPH04242019A JP3002574A JP257491A JPH04242019A JP H04242019 A JPH04242019 A JP H04242019A JP 3002574 A JP3002574 A JP 3002574A JP 257491 A JP257491 A JP 257491A JP H04242019 A JPH04242019 A JP H04242019A
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- wire rod
- temperature
- superconducting
- temperature heat
- 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- Withdrawn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 9
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 44
- 239000002994 raw material Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 4
- 239000013078 crystal Substances 0.000 abstract description 12
- 238000007669 thermal treatment Methods 0.000 abstract 4
- 238000000465 moulding Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910016264 Bi2 O3 Inorganic materials 0.000 description 3
- 229910008649 Tl2O3 Inorganic materials 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 235000010216 calcium carbonate Nutrition 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 3
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 3
- QTQRFJQXXUPYDI-UHFFFAOYSA-N oxo(oxothallanyloxy)thallane Chemical compound O=[Tl]O[Tl]=O QTQRFJQXXUPYDI-UHFFFAOYSA-N 0.000 description 3
- 229910002480 Cu-O Inorganic materials 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229910000018 strontium carbonate Inorganic materials 0.000 description 2
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 description 2
- 229910052716 thallium Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- -1 BaO2 Chemical compound 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- WKMKTIVRRLOHAJ-UHFFFAOYSA-N oxygen(2-);thallium(1+) Chemical compound [O-2].[Tl+].[Tl+] WKMKTIVRRLOHAJ-UHFFFAOYSA-N 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 229910003438 thallium oxide 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
【０００１】0001
【産業上の利用分野】この発明は、酸化物超電導線材の
製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing oxide superconducting wire.
【０００２】0002
【従来の技術】近年、より高い臨界温度を示す超電導材
料として、セラミック系のもの、すなわち酸化物超電導
材料が注目されている。2. Description of the Related Art In recent years, ceramic-based materials, ie, oxide superconducting materials, have attracted attention as superconducting materials exhibiting higher critical temperatures.
【０００３】その中で、Ｂｉ（ビスマス）系は１１０Ｋ
、Ｔｌ（タリウム）系は１２０Ｋ程度の高い臨界温度を
示しており、その実用化が期待されている。Among them, Bi (bismuth) is 110K
, Tl (thallium) system exhibits a high critical temperature of about 120 K, and its practical application is expected.
【０００４】Ｔｌ系超電導材料は、Ｔｌ−Ｃａ−Ｂａ／
Ｓｒ−Ｃｕ−Ｏの成分、またはこの成分の一部をＰｂ、
Ｂｉまたは希土類元素で置換した成分、またＢｉ系超電
導材料は、Ｂｉ−Ｃａ−Ｓｒ−Ｃｕ−Ｏの成分、または
この成分の一部をＰｂ、Ｔｌまたは希土類元素で置換し
た成分を有している。このような超電導材料には異なる
結晶構造および臨界温度を有する複数の超電導相の存在
することが知られている。また、原料粉末を熱処理して
このような超電導材料を製造しようとするとき、いくつ
かの超電導相が混在しやすいことや、非超電導相が一部
において現れることも知られている。[0004] Tl-based superconducting materials are Tl-Ca-Ba/
The Sr-Cu-O component or a part of this component is Pb,
A component substituted with Bi or a rare earth element, and a Bi-based superconducting material has a Bi-Ca-Sr-Cu-O component, or a component in which a part of this component is replaced with Pb, Tl or a rare earth element. . It is known that such superconducting materials include a plurality of superconducting phases having different crystal structures and critical temperatures. It is also known that when attempting to manufacture such a superconducting material by heat treating raw material powder, several superconducting phases tend to coexist, and that non-superconducting phases appear in some parts.
【０００５】また、このような超電導材料を用いて、長
尺の超電導線材を得る方法として、原料粉末を金属シー
スで被覆したり、あるいは長尺の基材上にコーティング
したり、またあるいは原料粉末をファイバ化し、これを
熱処理することにより、原料粉末を超電導体化して、超
電導線材にする製造方法が知られている。[0005] Furthermore, methods for obtaining long superconducting wires using such superconducting materials include coating the raw material powder with a metal sheath, coating it on a long base material, or coating the raw material powder with a metal sheath. A manufacturing method is known in which a raw material powder is turned into a superconductor by turning it into a fiber and heat-treating it, thereby producing a superconducting wire.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、超電導
線材をケーブルまたはマグネットに応用しようとするに
は、高い臨界温度に加えて、高い臨界電流密度を有して
いることが必要である。従来の製造方法により得られる
酸化物超電導線材は、臨界電流密度の点で未だ不十分で
あった。However, in order to apply superconducting wire to cables or magnets, it is necessary to have a high critical current density in addition to a high critical temperature. Oxide superconducting wires obtained by conventional manufacturing methods are still insufficient in terms of critical current density.
【０００７】この発明の目的は、臨界電流密度を向上す
ることのできる酸化物超電導線材の製造方法を提供する
ことにある。[0007] An object of the present invention is to provide a method for manufacturing an oxide superconducting wire that can improve the critical current density.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、臨界電流
密度の向上を目的として、超電導相の結晶粒の接合を向
上させる熱処理条件を見い出すべく鋭意研究を重ねた結
果、超電導相の生成が進行する７８０℃以上の温度範囲
の熱処理の後に、低温の熱処理を加えることにより、臨
界電流密度が向上することを見い出した。この発明は、
このような知見に基づきなされたものである。[Means for Solving the Problems] With the aim of improving the critical current density, the present inventors have conducted intensive research to find heat treatment conditions that improve the bonding of crystal grains of the superconducting phase, and as a result, the formation of the superconducting phase It has been found that the critical current density can be improved by adding low-temperature heat treatment after the heat treatment in the temperature range of 780° C. or higher. This invention is
This was done based on this kind of knowledge.
【０００９】すなわち、この発明は、酸化物超電導材料
の原料を線材に成形加工するステップと、線材に７８０
℃以上の温度の高温熱処理を施すステップと、高温熱処
理後の線材に５００〜７００℃の範囲内の温度で１〜２
００時間の低温熱処理を施すステップとを備えている。That is, the present invention includes a step of forming a raw material of an oxide superconducting material into a wire rod, and a step of forming a raw material of an oxide superconducting material into a wire rod, and
A step of subjecting the wire rod to high temperature heat treatment at a temperature of ℃ or higher, and 1 to 2 times at a temperature within the range of 500 to 700℃ to the wire after the high temperature heat treatment.
and a step of performing low-temperature heat treatment for 00 hours.
【００１０】この発明において、線材に成形加工された
後、７８０℃以上の温度の高温熱処理が施されると、目
的とする超電導相の単相化が進行するとともに、その反
応過程において結晶粒の成長が起こる。しかしながら、
高温での熱処理であるので、超電導相の各結晶粒間には
種々の欠陥が発生しやすく、粒子間の接合が不十分とな
るため、高臨界電流密度化が阻害される。[0010] In the present invention, after being formed into a wire rod, when it is subjected to high-temperature heat treatment at a temperature of 780°C or higher, the target superconducting phase becomes a single phase, and in the reaction process, the crystal grains are Growth occurs. however,
Since the heat treatment is performed at a high temperature, various defects are likely to occur between the crystal grains of the superconducting phase, and bonding between the grains becomes insufficient, which impedes achieving a high critical current density.
【００１１】この発明では、このような高温熱処理後の
線材に、さらに５００〜７００℃の範囲内の温度で１〜
２００時間の低温熱処理を施している。このような低温
熱処理により、新たな相変態を伴わずに、結晶粒間の欠
陥のみを回復させることができる。この結果、各結晶粒
間の接合が改善され、高い臨界電流密度が得られる。[0011] In the present invention, the wire rod after such high-temperature heat treatment is further treated at a temperature of 1 to 700°C.
It has been subjected to low temperature heat treatment for 200 hours. By such low-temperature heat treatment, only defects between crystal grains can be recovered without new phase transformation. As a result, the bonding between each crystal grain is improved and a high critical current density is obtained.
【００１２】この発明において低温熱処理を５００〜７
００℃としているのは、５００℃よりも低い温度である
と、結晶粒間の欠陥を回復させるのに十分な熱エネルギ
が得られず、結晶粒間の接合が改善されないからである
。また７００℃を超えると、新たな相変態を生じ、結晶
粒間に欠陥が発生する。[0012] In this invention, the low temperature heat treatment is performed at a temperature of 500 to 7
The reason why the temperature is set at 00°C is that if the temperature is lower than 500°C, sufficient thermal energy will not be obtained to recover defects between crystal grains, and bonding between crystal grains will not be improved. Moreover, when the temperature exceeds 700° C., a new phase transformation occurs and defects occur between crystal grains.
【００１３】この発明の低温熱処理では熱処理時間を１
〜２００時間にしている。熱処理時間が１時間より短い
と、結晶粒間の接合を改善する効果が十分でなくなるか
らである。また低温熱処理を２００時間より長く行なっ
ても特に支障はないが、長時間熱処理を加えても特性の
大きな向上は認められない。In the low temperature heat treatment of this invention, the heat treatment time is 1
~200 hours. This is because if the heat treatment time is shorter than 1 hour, the effect of improving bonding between crystal grains will not be sufficient. Furthermore, although there is no particular problem if the low-temperature heat treatment is carried out for longer than 200 hours, no significant improvement in properties is observed even if the heat treatment is carried out for a long time.
【００１４】[0014]
【発明の効果】この発明に従えば、高温熱処理により超
電導相を生成させた後に、低温熱処理を行なうことによ
って、生成した超電導相の各結晶粒間に良好な接合状態
が形成される。このため、臨界電流密度が向上する。According to the present invention, by performing low-temperature heat treatment after generating a superconducting phase by high-temperature heat treatment, a good bonding state is formed between each crystal grain of the generated superconducting phase. Therefore, the critical current density is improved.
【００１５】したがって、この発明に従い製造された酸
化物超電導線材は、ケーブルやマグネットなどへの実用
化の可能性が高められる。[0015] Therefore, the oxide superconducting wire manufactured according to the present invention has a high possibility of being put to practical use in cables, magnets, and the like.
【００１６】[0016]
【実施例】実施例１
Ｂｉ２ Ｏ３ 、ＰｂＯ、ＳｒＣＯ３ 、ＣａＣＯ３
、およびＣｕＯの各粉末を、Ｂｉ：Ｐｂ：Ｓｒ：Ｃａ：
Ｃｕ＝１．８：０．５：２：２：３の比率で配合し、こ
れにさらに１〜２０重量％のＰｂＯを添加して混合しペ
レットを成形した。これを８５０℃で３００時間焼成し
、Ｂｉ系超電導材料のための原料を得た。[Example] Example 1 Bi2 O3, PbO, SrCO3, CaCO3
, and CuO powders, Bi:Pb:Sr:Ca:
Cu was blended in a ratio of 1.8:0.5:2:2:3, and 1 to 20% by weight of PbO was further added and mixed to form pellets. This was fired at 850° C. for 300 hours to obtain a raw material for a Bi-based superconducting material.
【００１７】この原料を粉砕して、原料粉末とし、銀シ
ース内に充填した後、テープ状に加工した。その後、所
望の超電導相が十分に形成される２５０時間高温熱処理
を施した。次に、表１に示す低温熱処理条件で低温の熱
処理を施した。[0017] This raw material was pulverized to obtain a raw material powder, which was filled into a silver sheath and processed into a tape shape. Thereafter, high-temperature heat treatment was performed for 250 hours to sufficiently form the desired superconducting phase. Next, low-temperature heat treatment was performed under the low-temperature heat treatment conditions shown in Table 1.
【００１８】以上のようにして得られたＢｉ系超電導線
材の超電導相の割合をＸ線回折測定で求めるとともに、
液体窒素温度（７７．３Ｋ）における臨界電流密度を測
定した。表１にこの結果を示す。[0018] The proportion of the superconducting phase in the Bi-based superconducting wire obtained as described above was determined by X-ray diffraction measurement, and
The critical current density at liquid nitrogen temperature (77.3K) was measured. Table 1 shows the results.
【００１９】[0019]
【表１】[Table 1]
【００２０】表１から明らかなように、この発明に従う
低温熱処理を施した線材は、超電導相の割合が多く、か
つ高い臨界電流密度を示した。As is clear from Table 1, the wire rod subjected to the low temperature heat treatment according to the present invention had a high proportion of superconducting phase and exhibited a high critical current density.
【００２１】実施例２
Ｔｌ２ Ｏ３ 、ＢａＯ２ 、ＣａＯ、およびＣｕＯの
各粉末を、Ｔｌ：Ｂａ：Ｃａ：Ｃｕ＝１．８：２：２：
３の比率で配合し、これをペレットに成形した。ペレッ
ト成形後、８７０℃で１２時間焼成し、超電導材料のた
めの原料を得た。この原料を粉砕して、原料粉末とし、
銀シース内に充填した後、テープ状に加工した。このテ
ープ状線材を８５０℃で１時間、さらに８４０℃で６時
間熱処理を施した。Example 2 Tl2O3, BaO2, CaO, and CuO powders were prepared in the following manner: Tl:Ba:Ca:Cu=1.8:2:2:
3 and molded into pellets. After pelletizing, it was fired at 870°C for 12 hours to obtain a raw material for a superconducting material. This raw material is crushed into raw material powder,
After filling it into a silver sheath, it was processed into a tape shape. This tape-shaped wire rod was heat-treated at 850°C for 1 hour and then at 840°C for 6 hours.
【００２２】この後、さらに表２に示すような低温の熱
処理条件で低温熱処理を施した。このようにして得られ
たＴｌ系超電導材料の超電導相の割合をＸ線回折測定で
求めるとともに、液体窒素温度（７７．３Ｋ）における
臨界電流密度を測定した。この結果を表２に示す。[0022] Thereafter, low-temperature heat treatment was further performed under the low-temperature heat treatment conditions shown in Table 2. The proportion of the superconducting phase of the Tl-based superconducting material thus obtained was determined by X-ray diffraction measurement, and the critical current density at liquid nitrogen temperature (77.3 K) was measured. The results are shown in Table 2.
【００２３】[0023]
【表２】[Table 2]
【００２４】表２から明らかなように、この発明に従う
低温熱処理を施した線材は、超電導相の割合が多く、か
つ高い臨界電流密度を示した。As is clear from Table 2, the wire rods subjected to the low-temperature heat treatment according to the present invention had a high proportion of superconducting phase and exhibited a high critical current density.
【００２５】実施例３
Ｔｌ２ Ｏ３ 、ＰｂＯ、ＢａＣＯ３ 、ＣａＣＯ３
、およびＣｕＯの各粉末を原料とし、Ｔｌ：Ｐｂ：Ｂａ
：Ｃａ：Ｃｕ＝１．４：０．６：２：３：４の比率で配
合して混合し成形した。これを８９０℃で１０時間焼成
し、酸化物超電導材料のための原料を得た。次に、実施
例１と同様にして、この原料を粉砕して原料粉末とし、
銀シース内に充填した後、テープ状に加工した。このテ
ープ状線材を酸化タリウムとともに銀製の容器内に密閉
し、高温熱処理を施した。熱処理温度は８１０℃で１０
時間とした。Example 3 Tl2O3, PbO, BaCO3, CaCO3
, and CuO powder as raw materials, Tl:Pb:Ba
:Ca:Cu=1.4:0.6:2:3:4, mixed and molded. This was fired at 890° C. for 10 hours to obtain a raw material for an oxide superconducting material. Next, in the same manner as in Example 1, this raw material was ground into raw material powder,
After filling it into a silver sheath, it was processed into a tape shape. This tape-shaped wire was sealed together with thallium oxide in a silver container and subjected to high-temperature heat treatment. The heat treatment temperature is 810℃ and 10
It was time.
【００２６】次に、表３に示す低温熱処理条件で低温熱
処理を施した。このようにして得られたＴｌ系超電導材
料の超電導相の割合をＸ線回折測定で求めるとともに、
液体窒素温度（７７．３Ｋ）における臨界電流密度を測
定した。この結果を表３に示す。Next, low temperature heat treatment was performed under the low temperature heat treatment conditions shown in Table 3. The proportion of the superconducting phase of the Tl-based superconducting material thus obtained was determined by X-ray diffraction measurement, and
The critical current density at liquid nitrogen temperature (77.3K) was measured. The results are shown in Table 3.
【００２７】[0027]
【表３】[Table 3]
【００２８】表３から明らかなように、この発明に従う
低温熱処理を施した線材は、超電導相の割合が多く、か
つ高い臨界電流密度を示している。As is clear from Table 3, the wire rods subjected to the low-temperature heat treatment according to the present invention have a high proportion of superconducting phase and exhibit a high critical current density.
【００２９】実施例４
Ｔｌ２ Ｏ３ 、ＰｂＯ、ＳｒＣＯ３ 、ＣａＣＯ３
、およびＣｕＯの各粉末を原料とし、Ｔｌ：Ｐｂ：Ｓｒ
：Ｃａ：Ｃｕ＝１．５：０．６：２：２〜３：３〜４の
比率で配合して混合し成形した。これを８８０℃で６時
間焼成し、酸化物超電導材料のための原料を得た。この
後、この原料を粉砕して、原料粉末とし、これを銀シー
ス内に充填した後、テープ状に加工した。このテープ状
線材のみを銀製の容器内に密閉して、高温熱処理を施し
た。熱処理の温度は８００℃で１２時間とした。Example 4 Tl2O3, PbO, SrCO3, CaCO3
, and CuO powder as raw materials, Tl:Pb:Sr
:Ca:Cu=1.5:0.6:2:2-3:3-4 and mixed and molded. This was fired at 880° C. for 6 hours to obtain a raw material for an oxide superconducting material. Thereafter, this raw material was pulverized to obtain a raw material powder, which was filled into a silver sheath and processed into a tape shape. Only this tape-shaped wire rod was sealed in a silver container and subjected to high-temperature heat treatment. The temperature of the heat treatment was 800° C. for 12 hours.
【００３０】次に、表４に示す熱処理温度条件で低温熱
処理を施した。このようにして得られた酸化物超電導線
材の超電導相の割合をＸ線回折測定で求めるとともに、
液体窒素温度（７７．３Ｋ）における臨界電流密度を測
定した。結果を表４に示す。Next, low-temperature heat treatment was performed under the heat treatment temperature conditions shown in Table 4. The proportion of the superconducting phase in the oxide superconducting wire thus obtained was determined by X-ray diffraction measurement, and
The critical current density at liquid nitrogen temperature (77.3K) was measured. The results are shown in Table 4.
【００３１】[0031]
【表４】[Table 4]
【００３２】表４から明らかなように、この発明に従う
低温熱処理を施した線材は、超電導相の割合が多く、か
つ高い臨界電流密度を示した。As is clear from Table 4, the wire rods subjected to the low-temperature heat treatment according to the present invention had a high proportion of superconducting phase and exhibited a high critical current density.
【００３３】実施例５
ＰｂＯの代わりにＢｉ２ Ｏ３ を用い、Ｔｌ：Ｂｉ：
Ｓｒ：Ｃａ：Ｃｕ＝１．４：０．５：２：２：３の比率
で配合する以外は、実施例４と同様にして線材を作成し
、表５に示す低温熱処理条件で低温熱処理を施した。得
られた線材の超電導相の割合および臨界電流密度を表５
に示す。Example 5 Using Bi2 O3 instead of PbO, Tl:Bi:
A wire rod was prepared in the same manner as in Example 4, except that the ratio of Sr:Ca:Cu was 1.4:0.5:2:2:3, and the wire rod was subjected to low-temperature heat treatment under the low-temperature heat treatment conditions shown in Table 5. provided. Table 5 shows the ratio of superconducting phase and critical current density of the obtained wire.
Shown below.
【００３４】[0034]
【表５】[Table 5]
【００３５】表５から明らかなように、この発明に従う
低温熱処理を施した線材は、超電導相の割合が多く、か
つ高い臨界電流密度を示した。As is clear from Table 5, the wire rods subjected to the low-temperature heat treatment according to the present invention had a high proportion of superconducting phase and exhibited a high critical current density.
【００３６】実施例６
ＰｂＯの代わりにＢｉ２ Ｏ３ およびＰｂＯを用い、
Ｔｌ：Ｂｉ：Ｐｂ：Ｓｒ：Ｃａ：Ｃｕ＝１．４：０．３
：０．３：２：２：３の比率で配合する以外は、実施例
４と同様にして線材を作成し、表６に示す条件で低温熱
処理を施した。Example 6 Using Bi2 O3 and PbO instead of PbO,
Tl:Bi:Pb:Sr:Ca:Cu=1.4:0.3
A wire rod was prepared in the same manner as in Example 4, except that the wire rods were blended at a ratio of :0.3:2:2:3, and subjected to low-temperature heat treatment under the conditions shown in Table 6.
【００３７】得られた線材の超電導相の割合および臨界
電流密度を表６に示す。Table 6 shows the superconducting phase ratio and critical current density of the obtained wire.
【００３８】[0038]
【表６】[Table 6]
【００３９】表６から明らかなように、この発明に従う
低温熱処理を施した線材は、超電導相の割合が多く、か
つ高い臨界電流密度を示した。As is clear from Table 6, the wire rods subjected to the low-temperature heat treatment according to the present invention had a large proportion of superconducting phase and exhibited a high critical current density.
Claims (1)
加工するステップと、前記線材に７８０℃以上の温度の
高温熱処理を施すステップと、前記高温熱処理後の線材
に５００〜７００℃の範囲内の温度で１〜２００時間の
低温熱処理を施すステップとを備える、酸化物超電導線
材の製造方法。1. A step of forming a raw material of an oxide superconducting material into a wire rod, a step of subjecting the wire rod to high-temperature heat treatment at a temperature of 780°C or higher, and a step of subjecting the wire rod after the high-temperature heat treatment to a temperature within a range of 500 to 700°C. A method for manufacturing an oxide superconducting wire, comprising the step of performing low-temperature heat treatment at a temperature of 1 to 200 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3002574A JPH04242019A (en) | 1991-01-14 | 1991-01-14 | Manufacture of oxide superconductive wire rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3002574A JPH04242019A (en) | 1991-01-14 | 1991-01-14 | Manufacture of oxide superconductive wire rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04242019A true JPH04242019A (en) | 1992-08-28 |
Family
ID=11533146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3002574A Withdrawn JPH04242019A (en) | 1991-01-14 | 1991-01-14 | Manufacture of oxide superconductive wire rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04242019A (en) |
-
1991
- 1991-01-14 JP JP3002574A patent/JPH04242019A/en not_active Withdrawn
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