JPH0350118A - Superconducting wire and its manufacturing method - Google Patents
Superconducting wire and its manufacturing methodInfo
- Publication number
- JPH0350118A JPH0350118A JP1183208A JP18320889A JPH0350118A JP H0350118 A JPH0350118 A JP H0350118A JP 1183208 A JP1183208 A JP 1183208A JP 18320889 A JP18320889 A JP 18320889A JP H0350118 A JPH0350118 A JP H0350118A
- Authority
- JP
- Japan
- Prior art keywords
- temperature phase
- low
- oxide
- temperature
- superconducting wire
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910014454 Ca-Cu Inorganic materials 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000011247 coating layer Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000000151 deposition Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 7
- 230000001747 exhibiting effect Effects 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005245 sintering Methods 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
- Inorganic Compounds Of Heavy Metals (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
この発明は、超電導マグネットや超電導ケーブルなどに
用いることのできる超電導線材およびその製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a superconducting wire that can be used for superconducting magnets, superconducting cables, etc., and a method for manufacturing the same.
［従来の技術］
酸化物超電導材を用いた超電導線材においては、臨界電
流密度（Ｊ ｃ）の向上が従来から求められている。酸
化物超電導材として比較的高い臨界温度（Ｔｃ）を示す
Ｂｉ系酸化物超電導材においては、Ｂ ｉ １．ｊｌ
Ｓ ｒ４．（３Ｃａ、、２ Ｃｕ２．２ ｏＹを出発原
料とした原料粉末を用い、Ｌａ５ｅｒ−Ｈｅａｔｅｄ
Ｐｅｄｅｓｔａｌ Ｇｒｏｗｔｈ法（以下ｒＬＨＰ
Ｇ法」という）により大きなＪｃを有する超電導ファイ
バを作製したことが報告されている（Ｊｏｕｒｎａｌ
ｏｆ ＣｒｙｓｔａＩ Ｇｒｏｗｔｈ、９１ （
１９８８）３８−３３０、 ”Ｌａ５ｅｒ
Ｈｅａｔｅｄ Ｐｅｄｅｓｔａｌ Ｇｒｏｗｔ
ｈ ｏｆ Ｈｉｇｈ Ｔｃ Ｓｕｐｅｒｃｏｎ
ｄｕｃｔｉｎｇ Ｆｉｂｅｒ’Ｇａｚｉｔ Ｆｅｉ
ｇｅｌｓｏｎ）、また、Ｂｉ２Ｓｒ２ Ｃａ２ Ｃｕ、
をベースとして、ｐｂを添加した原料粉末を用いて、Ｌ
ＨＰＧ法により大きなＪｃを有する超電導ファイバを作
製したことが報告されている（Ｇ、Ｆ、ｄｅ、ｕａ、Ｆ
ｕｅｎｔｅ ｅｔ ａｌ、、ＭＲ３５ＰＲＩＮＧ
ＭＥＥＴＩＮＧ、Ａｐｒｉ １ １９８９）。[Prior Art] In superconducting wires using oxide superconducting materials, an improvement in critical current density (Jc) has been conventionally required. In Bi-based oxide superconducting materials that exhibit a relatively high critical temperature (Tc) as oxide superconducting materials, B i 1. jl
Sr4. (La5er-Heated
Pedestal Growth method (rLHP)
It has been reported that a superconducting fiber with a large Jc was fabricated by the ``G method'' (Journal
of CrystaI Growth, 91 (
1988) 38-330, “La5er
Heated Pedestal Grow
h of High Tc Supercon
ducting Fiber'Gazit Fei
gelson), also Bi2Sr2Ca2Cu,
Based on the raw material powder to which PB is added, L
It has been reported that superconducting fibers with large Jc were fabricated by the HPG method (G, F, de, ua, F
uente et al,, MR35PRING
MEETING, April 1 1989).
［発明が解決しようとする課題］
しかしながら、これらの従来の製造方法によって製造さ
れたＢｉ系酸化物超電導線材であっても、十分に大きな
Ｊｃの値は得られておらず、より大きなＪｃを示す超電
導線材の製造方法が要望されている。[Problems to be Solved by the Invention] However, even with Bi-based oxide superconducting wires manufactured by these conventional manufacturing methods, a sufficiently large Jc value is not obtained, and it is necessary to show a larger Jc value. There is a need for a method for manufacturing superconducting wire.
Ｂｉ系酸化物超電導材においては、高いＴｃを示す高温
相とより低いＴｃを示す低温相の存在することが知られ
ている。出発原料の組成比をＢ１２−ｘＰｂｘＳ ｒ２
Ｃａｌ Ｃｕ２ （０≦Ｘ≦０．８）とすると、低
温相のみが析出し、この低温相を熱処理しても高温相の
析出が認められない。また、一方出発原料の組成比をＢ
１２−ｘＰｂｘＳｒ２ Ｃａｚｃｕｉ（０≦Ｘ≦０．８
）とすると、まず低温相が析出し、この低温相を熱処理
することによって高温相の析出することが見出されてい
る。しかしながら、低温相は比較的配向性が高いのに対
して、このようにして得られた高温相は高い配向性が得
られておらず、Ｊｃの向上が図れない原因となっている
。これは、高温相の生成源と考えられるＳｒ−Ｃａ−Ｃ
ｕを相が高温相中に多量に分散して、高温相がランダム
に析出しているためと考えられる。It is known that Bi-based oxide superconducting materials have a high temperature phase exhibiting a high Tc and a low temperature phase exhibiting a lower Tc. The composition ratio of the starting materials is B12-xPbxS r2
When Cal Cu2 (0≦X≦0.8), only a low-temperature phase precipitates, and even if this low-temperature phase is heat-treated, no precipitation of a high-temperature phase is observed. In addition, on the other hand, the composition ratio of the starting materials is set to B
12-xPbxSr2 Cazcui (0≦X≦0.8
), it has been found that a low-temperature phase precipitates first, and that by heat-treating this low-temperature phase, a high-temperature phase precipitates. However, while the low-temperature phase has relatively high orientation, the high-temperature phase obtained in this way does not have high orientation, which is the reason why Jc cannot be improved. This is because Sr-Ca-C is thought to be the source of the high-temperature phase.
This is considered to be because a large amount of u is dispersed in the high-temperature phase, and the high-temperature phase precipitates randomly.
したがって、このような原因から従来の製造方法では高
配向性の高温相が得られておらず、十分に大きなＪｃを
示す超電導線材が得られていない。Therefore, due to these reasons, a highly oriented high-temperature phase cannot be obtained by conventional manufacturing methods, and a superconducting wire exhibiting a sufficiently large Jc cannot be obtained.
この発明は、かかる従来の問題点を解消し、十分に大き
なＪｃを示す超電導線材およびその製造方法を提供する
ことにある。The object of the present invention is to solve these conventional problems and provide a superconducting wire exhibiting a sufficiently large Jc and a method for manufacturing the same.
［課題を解決するための手段］
この発明の超電導線材は、Ｂｉ系酸化物超電導線材の低
温相からなる低温相芯部と、低温相芯部のまわりに設け
られるＳｒ−Ｃａ−Ｃｕ酸化物を熱処理することにより
、低温相芯部との界面領域に形成されるＢｉ系酸化物超
電導材の高温相からなる高温相被覆部とを備えている。[Means for Solving the Problems] The superconducting wire of the present invention includes a low-temperature phase core made of a low-temperature phase of a Bi-based oxide superconducting wire, and a Sr-Ca-Cu oxide provided around the low-temperature core. A high-temperature phase covering portion made of a high-temperature phase of Bi-based oxide superconducting material is formed at the interface region with the low-temperature phase core by heat treatment.
この発明において低温相は高配向性であることが好まし
く、したがって一方向凝固により長手方向に結晶を配向
させたものが好ましい。In this invention, the low-temperature phase is preferably highly oriented, and therefore preferably has crystals oriented in the longitudinal direction by unidirectional solidification.
この発明の超電導線材の製造方法では、Ｂｉ系酸化物超
電導材の低温相からなる低温相芯部を形成し、低温相芯
部をＳｒ−Ｃａ−Ｃｕ酸化物の溶融液中に浸漬してＳｒ
−Ｃａ−Ｃｕ酸化物からなる被覆層を形成し、被覆層を
熱処理して、低温相芯部との界面領域にＢｉ系酸化物超
電導材の高温相を析出させ、高温相被覆部を形成させる
各ステップを備えている。In the method for manufacturing a superconducting wire of the present invention, a low-temperature phase core made of a low-temperature phase of a Bi-based oxide superconducting material is formed, and the low-temperature phase core is immersed in a melt of Sr-Ca-Cu oxide.
- Forming a coating layer made of Ca-Cu oxide and heat-treating the coating layer to precipitate a high-temperature phase of Bi-based oxide superconducting material in the interface region with the low-temperature phase core to form a high-temperature phase coating. Equipped with each step.
この発明の製造方法においては、低温相芯部の原料粉末
として、Ｂｉ２．−、ＸＰｂｘＳｒ２ Ｃａ、Ｃｕ２
（０≦Ｘ≦０．８）の組成比を有する酸化物粉末を用い
ることが好ましい。In the manufacturing method of the present invention, Bi2. -, XPbxSr2 Ca, Cu2
It is preferable to use an oxide powder having a composition ratio of (0≦X≦0.8).
また、低温和芯部は、８１０℃以上８５０℃以下の温度
のＳｒ−Ｃａ−Ｃｕ酸化物の溶融液中に、低温相芯部を
１分以上１時間以内浸漬して保持することが好ましい。Further, it is preferable that the low-temperature phase core portion is maintained by immersing it in a melt of Sr-Ca-Cu oxide at a temperature of 810° C. to 850° C. for 1 minute to 1 hour.
さらに、被覆層を熱処理する条件としては、８６０℃を
上限とし７８０℃を下限とした範囲内で温度勾配を持た
せた炉中を、１ｍｍ／ｈｒ以上１００ｍｍ／ｈｒ以下の
速度で、２４時間以上３００時間以内の時間をかけて移
動させ熱処理することが好ましい。Furthermore, the conditions for heat treating the coating layer are as follows: in a furnace with a temperature gradient within the range of 860°C as the upper limit and 780°C as the lower limit, at a speed of 1 mm/hr or more and 100 mm/hr or less for 24 hours or more. It is preferable that the moving and heat treatment be carried out over a period of up to 300 hours.
［発明の作用効果］
この発明の超電導線材では、低温相芯部のまわりに設け
たＳｒ−Ｃａ−Ｃｕ酸化物を熱処理して、低温相芯部と
の界面領域に形成したＢｉ系酸化物の超電導材の高温相
からなる高温和被覆部を備えている。低温相芯部は長手
方向に沿う高配向性を示すため、このような低温相芯部
との界面領域に形成される高温相は、長手方向に沿って
配向しながら形成される。したがって、このようにして
形成される高温相被覆部を、高いＴｃを有しかつ大きな
Ｊｃを示す高温相とすることができる。[Operations and Effects of the Invention] In the superconducting wire of the present invention, the Sr-Ca-Cu oxide provided around the low-temperature phase core is heat-treated, and the Bi-based oxide formed in the interface region with the low-temperature phase core is heated. It is equipped with a high-temperature coating made of a high-temperature phase of superconducting material. Since the low-temperature phase core exhibits high orientation along the longitudinal direction, the high-temperature phase formed in the interface region with such a low-temperature phase core is oriented along the longitudinal direction. Therefore, the high-temperature phase coating portion formed in this manner can be a high-temperature phase having a high Tc and exhibiting a large Jc.
特に、低温相芯部の原料粉末としてＢ ｉ ２−ｘ Ｐ
ｂｘＳｒ２Ｃａ、Ｃｕ２ （０≦Ｘ≦０．８）の組成
比を有する酸化物粉末を用いると、Ｓｒ−Ｃａ−Ｃｕ−
０相の析出を極力少なくす゛ることかでき、特に高い配
向性を有する低温相とすることができる。In particular, B i 2-x P is used as the raw material powder for the low-temperature phase core.
When using an oxide powder having a composition ratio of bxSr2Ca, Cu2 (0≦X≦0.8), Sr-Ca-Cu-
Precipitation of the zero phase can be minimized, and a low-temperature phase with particularly high orientation can be obtained.
また、低温相芯部を一方向凝固などの方法によって長手
方向に結晶配向を持たせ、結晶の成長方向を結晶のＣ軸
と垂直にすれば、通電方向を長手方向としたときにより
大きなＪｃを得ることができる。In addition, if the low-temperature phase core is given crystal orientation in the longitudinal direction by a method such as unidirectional solidification, and the crystal growth direction is perpendicular to the C-axis of the crystal, a larger Jc can be obtained when the current direction is the longitudinal direction. Obtainable.
この発明では、低温相芯部のまわりのＳｒ−Ｃａ−Ｃｕ
酸化物からなる被覆層を熱処理することにより、低温和
芯部との界面領域に高温相を析出させている。このよう
に低温和芯部との界面領域に高温相を析出させることに
より、析出した高温相には従来のようなＳ ｒ−Ｃａ−
Ｃｕ−０相の分散がなくなり、低温相芯部の配向性に沿
った配向性を有する高温相とすることができる。このた
め、従来よりも大きなＪｃを有する高温相とすることが
できる。In this invention, Sr-Ca-Cu around the low temperature phase core part
By heat-treating the coating layer made of oxide, a high-temperature phase is precipitated at the interface region with the low-temperature core. By precipitating a high-temperature phase in the interface region with the low-temperature core, the precipitated high-temperature phase contains Sr-Ca-
Dispersion of the Cu-0 phase is eliminated, and a high-temperature phase having an orientation along the orientation of the low-temperature phase core can be obtained. Therefore, it is possible to form a high-temperature phase having a larger Jc than before.
このような高温相は長手方向に沿って徐々に析出させて
いくことが好ましく、このような析出のためには、８６
０℃を上限とし７８０℃を下限とした範囲内で温度勾配
を持たせた炉中を、１ｍｍ／ｈｒ以上１００ｍｍ／ｈｒ
以下の速度で、２４時間以上３００時間以内の時間をか
けて移動させることが好ましい。It is preferable to gradually precipitate such a high temperature phase along the longitudinal direction.
In a furnace with a temperature gradient within a range with an upper limit of 0°C and a lower limit of 780°C, the heating rate is 1 mm/hr or more and 100 mm/hr.
It is preferable to move at the following speed over a time period of 24 hours to 300 hours.
［実施例］
Ｂ ｉ２０． 、ＰｂＯ５Ｓ ｒｃｏ、 、ＣａＣ０，
、およびＣｕＯ（いずれも純度９９．９％）を、原子モ
ル比でＢｉ ：Ｐｂ：Ｓｒ：Ｃａ：Ｃｕ−１゜４：０．
６：２．ｏ：ｉ、Ｏ：２．Ｏの割合となるように秤量し
て、乳鉢で混合した。混合した粉末を、７５０℃Ｘ１２
時間仮焼した後粉砕し、再び８００℃Ｘ１２時間仮焼し
た後粉砕し、さらに８５０℃×９６時間仮焼した。この
粉末を静水圧でラバープレスして、直径４ｍｍ、長さ１
００ｍｍの棒状に成形した。この成形物を、さらに８０
０℃×２時間および８５０℃Ｘ２０時間焼結した後、Ｌ
ＨＰＧ法により、成長速度１０ｍｍ／ｈｒで引上げて成
長させた。得られた低温相芯部である超電導ファイバの
サイズは、直径１．０ｍｍ。[Example] B i20. , PbO5S rco, , CaC0,
, and CuO (all purity 99.9%) in an atomic molar ratio of Bi:Pb:Sr:Ca:Cu-1°4:0.
6:2. o:i, O:2. They were weighed so as to have the same proportions as O and mixed in a mortar. The mixed powder was heated to 750℃×12
After calcining for an hour, it was crushed, calcined again at 800°C for 12 hours, crushed, and further calcined at 850°C for 96 hours. This powder was rubber-pressed using hydrostatic pressure, and the diameter was 4 mm and the length was 1 mm.
It was molded into a rod shape of 00 mm. This molded product is further
After sintering at 0°C for 2 hours and at 850°C for 20 hours, L
It was pulled and grown by the HPG method at a growth rate of 10 mm/hr. The size of the obtained superconducting fiber, which is the low-temperature phase core, is 1.0 mm in diameter.
長さ１００ｍｍであった。The length was 100 mm.
ＳｒＣＯａ、ＣａＣ０ａ、およびＣｕＯ（それぞれ純度
９９．９％）を、原子モル比でＳｒ二Ｃａ：ｃｕ−１：
１：４の割合となるように秤量して、乳鉢で混合した。SrCOa, CaC0a, and CuO (each with a purity of 99.9%) were prepared in an atomic molar ratio of Sr2Ca:cu-1:
They were weighed and mixed in a mortar at a ratio of 1:4.
混合した粉末を、７５０℃×１２時間仮焼した後粉砕し
、さらに７８０℃×９６時間仮焼して、これをるつぼに
詰めて８５０℃で溶融させて、Ｓｒ−Ｃａ−Ｃｕ酸化物
の溶融液を調製した。この融液に、長さ２０ｍｍに切断
した超電導ファイバの１つを浸漬して、所定時間保持し
た後引上げて、超電導ファイバのまわりにＳｒ−Ｃａ−
Ｃｕ酸化物からなる被覆層を形成した。The mixed powder was calcined at 750°C for 12 hours, then pulverized, further calcined at 780°C for 96 hours, and then packed in a crucible and melted at 850°C to melt the Sr-Ca-Cu oxide. A liquid was prepared. One of the superconducting fibers cut to a length of 20 mm was immersed in this melt, held for a predetermined time, and then pulled up to form a layer of Sr-Ca-
A coating layer made of Cu oxide was formed.
この被覆層を形成した超電導ファイバを、所定の温度勾
配を有した炉中に入れて移動させ熱処理を行なった。炉
は全長が１２５０ｍｍのものを用い、入口から２５０ｍ
ｍまでは所定の温度まで加熱する部分であり、次の１０
００ｍｍの部分は所定の温度勾配を有する部分である。The superconducting fiber with the coating layer formed thereon was placed in a furnace having a predetermined temperature gradient and moved to undergo heat treatment. The furnace used has a total length of 1250 mm, and is 250 m from the entrance.
The part up to m is the part that is heated to a predetermined temperature, and the next 10
The 00 mm portion is a portion having a predetermined temperature gradient.
第１図は、上限は８５０℃とし、下限を７９０℃とした
場合の熱処理炉内の温度勾配を示す図である。FIG. 1 is a diagram showing the temperature gradient in the heat treatment furnace when the upper limit is 850°C and the lower limit is 790°C.
表１に示すように、Ｓｒ−Ｃａ−Ｃｕ酸化物の溶融液中
に超電導ファイバを保持する時間、熱処理炉内での温度
範囲、熱処理時間、熱処理炉中の移動速度を変化させて
熱処理を行ない、得られた超電導線材についてＴｃおよ
びＪｃを？ＶＰＩ定した。As shown in Table 1, the heat treatment was performed by changing the time for holding the superconducting fiber in the Sr-Ca-Cu oxide melt, the temperature range in the heat treatment furnace, the heat treatment time, and the movement speed in the heat treatment furnace. , Tc and Jc of the obtained superconducting wire? VPI was determined.
得られた結果を表１に併せて示す。なお、Ｊｃは７７に
、ＯＴの条件下で測定した値である。The obtained results are also shown in Table 1. Note that Jc is a value of 77 measured under OT conditions.
なお、比較として、Ｓｒ−Ｃａ−Ｃｕ酸化物溶融液中に
ディッピングせずに単に８５０℃で１００時間熱処理し
たときの超電導線材を作製し、比較例として表１に結果
を併せて示した。For comparison, a superconducting wire was prepared by simply heat-treating at 850° C. for 100 hours without dipping in the Sr-Ca-Cu oxide melt, and the results are also shown in Table 1 as a comparative example.
（以下余白）
表１の結果から明らかなように、この発明に従う実施例
１〜１１の超電導線材は、比較例の超電導線材に比べ、
Ｊｃが大きくなっている。特に、Ｓｒ−Ｃａ−Ｃｕ酸化
物融液中での保持時間が１分以上１時間以内であり、炉
中の温度勾配が８６０〜７８０℃の範囲内の温度勾配で
あり、熱処理時間が２４時間以上３００時間以内であり
、炉内の移動速度が１〜１００ｍｍ／ｈｒの範囲内の速
度であるものが、より大きなＪｃを示している。(The following is a blank space) As is clear from the results in Table 1, the superconducting wires of Examples 1 to 11 according to the present invention have lower
Jc is getting bigger. In particular, the holding time in the Sr-Ca-Cu oxide melt is from 1 minute to 1 hour, the temperature gradient in the furnace is within the range of 860 to 780°C, and the heat treatment time is 24 hours. Those in which the period of time is 300 hours or less and the moving speed within the furnace is within the range of 1 to 100 mm/hr indicate a larger Jc.
第１図は、この発明の一実施例における炉中の温度勾配
の一例を示す図ある。FIG. 1 is a diagram showing an example of a temperature gradient in a furnace in an embodiment of the present invention.
Claims (6)
芯部と、 前記低温相芯部のまわりに設けられるＳｒ−Ｃａ−Ｃｕ
酸化物を熱処理することにより、前記低温相芯部との界
面領域に形成されるＢｉ系酸化物超電導材の高温相から
なる高温相被覆部とを備える、超電導線材。(1) A low-temperature phase core made of a low-temperature phase of a Bi-based oxide superconducting wire, and a Sr-Ca-Cu provided around the low-temperature phase core.
A superconducting wire comprising: a high-temperature phase coating section made of a high-temperature phase of a Bi-based oxide superconducting material formed in an interface region with the low-temperature phase core section by heat-treating the oxide.
晶を配向させたものである、請求項１記載の超電導線材
。(2) The superconducting wire according to claim 1, wherein the low-temperature phase core has crystals oriented in the longitudinal direction by unidirectional solidification.
部を形成し、 前記低温相芯部をＳｒ−Ｃａ−Ｃｕ酸化物の溶融液中に
浸漬してＳｒ−Ｃａ−Ｃｕ酸化物からなる被覆層を形成
し、 前記被覆層を熱処理して、前記低温相芯部との界面領域
にＢｉ系酸化物超電導材の高温相を析出させ、高温相被
覆部を形成させる各ステップを備える、超電導線材の製
造方法。(3) A low-temperature phase core made of a low-temperature phase of a Bi-based oxide superconducting material is formed, and the low-temperature phase core is immersed in a melt of Sr-Ca-Cu oxide to form a Sr-Ca-Cu oxide. forming a coating layer, and heat-treating the coating layer to precipitate a high-temperature phase of a Bi-based oxide superconducting material in an interface region with the low-temperature phase core to form a high-temperature phase coating. , a method for manufacturing superconducting wire.
０≦ｘ≦０．８）の組成比を有する酸化物粉末を用いる
、請求項３記載の超電導線材の製造方法。(4) As the raw material powder of the low temperature phase core part, Bi_2_-_xPb_xSr_2Ca_1Cu_2(
4. The method for manufacturing a superconducting wire according to claim 3, wherein oxide powder having a composition ratio of 0≦x≦0.8 is used.
℃以下の温度のＳｒ−Ｃａ−Ｃｕ酸化物の溶融液中に、
低温相芯部を１分以上１時間以内浸漬して保持するステ
ップを備える、請求項３記載の超電導線材の製造方法。(5) The coating layer forming step is performed at a temperature of 810° C. or higher and 850° C.
In the melt of Sr-Ca-Cu oxide at a temperature below ℃,
4. The method for manufacturing a superconducting wire according to claim 3, comprising the step of immersing and holding the low-temperature phase core for 1 minute or more and 1 hour or less.
０℃を下限とした範囲内で温度勾配を持たせた炉中を、
１ｍｍ／ｈｒ以上１００ｍｍ／ｈｒ以下の速度で、２４
時間以上３００時間以内の時間をかけて移動させるステ
ップを備える、請求項３記載の超電導線材の製造方法。(6) The heat treatment step has an upper limit of 860°C and 78°C.
Inside the furnace, which has a temperature gradient within a range with the lower limit of 0℃,
At a speed of 1 mm/hr or more and 100 mm/hr or less, 24
4. The method for manufacturing a superconducting wire according to claim 3, further comprising the step of moving the wire over a period of time ranging from 1 hour to 300 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1183208A JPH0350118A (en) | 1989-07-14 | 1989-07-14 | Superconducting wire and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1183208A JPH0350118A (en) | 1989-07-14 | 1989-07-14 | Superconducting wire and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0350118A true JPH0350118A (en) | 1991-03-04 |
Family
ID=16131670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1183208A Pending JPH0350118A (en) | 1989-07-14 | 1989-07-14 | Superconducting wire and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0350118A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5320506A (en) * | 1990-10-01 | 1994-06-14 | Copeland Corporation | Oldham coupling for scroll compressor |
| JP2007500667A (en) * | 2003-07-28 | 2007-01-18 | クリー インコーポレイテッド | Reduction of nitrogen content in silicon carbide crystals by sublimation growth under hydrogen-containing atmosphere |
| JP2012134513A (en) * | 2003-10-16 | 2012-07-12 | Cree Inc | Methods of forming power semiconductor devices using boule-grown silicon carbide drift layers, and power semiconductor devices formed by the method |
-
1989
- 1989-07-14 JP JP1183208A patent/JPH0350118A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5320506A (en) * | 1990-10-01 | 1994-06-14 | Copeland Corporation | Oldham coupling for scroll compressor |
| JP2007500667A (en) * | 2003-07-28 | 2007-01-18 | クリー インコーポレイテッド | Reduction of nitrogen content in silicon carbide crystals by sublimation growth under hydrogen-containing atmosphere |
| JP4891076B2 (en) * | 2003-07-28 | 2012-03-07 | クリー インコーポレイテッド | Reduction of nitrogen content in silicon carbide crystals by sublimation growth under hydrogen-containing atmosphere |
| JP2012134513A (en) * | 2003-10-16 | 2012-07-12 | Cree Inc | Methods of forming power semiconductor devices using boule-grown silicon carbide drift layers, and power semiconductor devices formed by the method |
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