JPH03214516A - Manufacture of superconductor - Google Patents
Manufacture of superconductorInfo
- Publication number
- JPH03214516A JPH03214516A JP2009459A JP945990A JPH03214516A JP H03214516 A JPH03214516 A JP H03214516A JP 2009459 A JP2009459 A JP 2009459A JP 945990 A JP945990 A JP 945990A JP H03214516 A JPH03214516 A JP H03214516A
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- powder
- heat treatment
- hours
- manufacturing
- 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
- 239000002887 superconductor Substances 0.000 title claims description 43
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 13
- 238000005491 wire drawing Methods 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 239000012071 phase Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052797 bismuth Inorganic materials 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 241001148502 Colysis Species 0.000 description 1
- 229910002480 Cu-O Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 239000003381 stabilizer Substances 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
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、酸化物超電導体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 method for producing an oxide superconductor.
［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
ミック系のものが注目されている。中でも、ビスマス系
の超電導材料は高い臨界温度を示すことが知られており
、１１０Ｋ程度の臨界温度を示す高温超電導相と８０Ｋ
程度の臨界温度を示す低温超電導相などの存在が知られ
ている。このようなビスマス系超電導材料においては、
高い臨界温度でかつ高い臨界電流密度を得ることを目的
に種々の試みがなされている。[Prior Art] In recent years, ceramic-based materials have attracted attention as superconducting materials exhibiting higher critical temperatures. Among them, bismuth-based superconducting materials are known to exhibit a high critical temperature, with a high-temperature superconducting phase exhibiting a critical temperature of approximately 110K and a high-temperature superconducting phase exhibiting a critical temperature of approximately 80K.
It is known that there are low-temperature superconducting phases that exhibit a critical temperature of about In such bismuth-based superconducting materials,
Various attempts have been made to obtain a high critical current density at a high critical temperature.
［発明が解決しようとする課題］
このような酸化物超電導体をケーブルやマグネットに応
用する場合、高い臨界温度と臨界電流密度が必要となる
。上述のビスマス系超電導体においては、できるだけ多
くの高温超電導相を生成させて臨界温度を高めるととも
に、結晶粒同士の結合を強くして臨界電流密度を向上さ
せることが望ましい。[Problems to be Solved by the Invention] When applying such an oxide superconductor to cables and magnets, a high critical temperature and critical current density are required. In the above-mentioned bismuth-based superconductor, it is desirable to generate as many high-temperature superconducting phases as possible to raise the critical temperature and to strengthen the bonds between crystal grains to improve the critical current density.
この発明の目的は、高い臨界温度かつ高い臨界電流密度
を示すＢ ｉ−Ｐｂ−Ｓ ｒ−Ｃａ−Ｃｕ −Ｏ系超電
導体を製造する方法を提供することにある。An object of the present invention is to provide a method for producing a B i-Pb-S r-Ca-Cu-O superconductor that exhibits a high critical temperature and a high critical current density.
［課題を解決するための手段］
この発明の超電導体の製造方法は、Ｂｉ−Ｐｂ−Ｓ ｒ
−Ｃａ−Ｃｕ−０系超電導体を製造する方法であり、原
料粉末を８３０℃以上の温度で熱処理して２２１２相を
主体とするＢｉ−Ｐｂ−ＳｒＣａ−Ｃｕ−０系超電導体
の粉末を調製し、超電導体の粉末を金属シースで被覆し
て複合材とし、複合材を塑性加工した後熱処理する各工
程を備えている。[Means for Solving the Problems] A method for manufacturing a superconductor of the present invention includes Bi-Pb-S r
- This is a method for producing Ca-Cu-0 based superconductor, in which raw material powder is heat treated at a temperature of 830°C or higher to prepare Bi-Pb-SrCa-Cu-0 based superconductor powder mainly composed of 2212 phase. It also includes the steps of coating superconductor powder with a metal sheath to form a composite material, plastically working the composite material, and then heat-treating it.
ここで、２２１２相は、Ｂｉ＋Ｐｂ：Ｓｒ：Ｃａ：Ｃｕ
がおおよそ２：２：１：２の組成比である相をいい、一
般に低温超電導相に相当するものである。Here, the 2212 phase is Bi+Pb:Sr:Ca:Cu
refers to a phase in which the composition ratio is approximately 2:2:1:2, and generally corresponds to a low-temperature superconducting phase.
また２２２３相は、Ｂｉ十Ｐｂ：Ｓｒ：Ｃａ：Ｃｕが２
：２：２：３の組成比である相をいい、一般に高温超電
導相に相当する相である。In addition, the 2223 phase is Bi + Pb:Sr:Ca:Cu.
:2:2:3 composition ratio, and generally corresponds to a high temperature superconducting phase.
この発明で、原料粉末の熱処理は、８３０℃以上８７０
℃以下であることが好ましい。また熱処理時間は２４時
間以下であることが好ましい。In this invention, the heat treatment of the raw material powder is performed at a temperature of 830°C or higher and 870°C.
It is preferable that it is below ℃. Further, the heat treatment time is preferably 24 hours or less.
この発明の方法により得られるＢｉ−Ｐｂ−Ｓｒ−Ｃａ
−Ｃｕ−０系超電導体の組成比は、Ｂｉ＋Ｐｂ：Ｓｒ：
Ｃａ 二 Ｃｕ−１． ５ 〜 ２． ５：
１．８〜２．２：１．８〜２．５：２．５〜３．５であ
ることが好ましい。ｐｂは、Ｂｉの１０〜４０％、好ま
しくは２０％程度を置換させる。Bi-Pb-Sr-Ca obtained by the method of this invention
-The composition ratio of the Cu-0 based superconductor is Bi+Pb:Sr:
Ca 2 Cu-1. 5-2. 5:
It is preferable that they are 1.8-2.2:1.8-2.5:2.5-3.5. pb replaces 10 to 40% of Bi, preferably about 20%.
また、この発明において塑性加工は、伸線加工または伸
線加工および平角／テーブ状の加工を含むことが好まし
い。Further, in the present invention, the plastic working preferably includes wire drawing or wire drawing and rectangular/tabular processing.
また塑性加工とその後の熱処理は複数回繰返されること
が好ましい。Moreover, it is preferable that the plastic working and subsequent heat treatment be repeated multiple times.
この発明において製造されるＢｉ−Ｐｂ−ＳｒＣａ−Ｃ
ｕ−０系超電導体は、ビスマスの一部をアンチモンなど
の他の元素で置換したり、あるいはリチウムなどを添加
してもよい。Bi-Pb-SrCa-C produced in this invention
In the u-0 superconductor, part of the bismuth may be replaced with another element such as antimony, or lithium or the like may be added.
またこの発明で用いられる原料粉末は、固相法、共沈法
、硝酸塩共分解法などで作製することができる。Further, the raw material powder used in this invention can be produced by a solid phase method, a coprecipitation method, a nitrate colysis method, or the like.
この発明で熱処理した超電導体粉末を被覆する金属シー
スとしては、超電導体の粉末と反応しにくく、かつ加工
性が良好な材質であれば特に限定されない。このような
材料として、たとえば、銀、銀合金、金、および金合金
や、あるいはこれらのシース層を中間層として配置した
ものなどが挙げられる。また、使用条件において、安定
化材として機能する材料が好ましい。The metal sheath that covers the heat-treated superconductor powder in the present invention is not particularly limited as long as it is made of a material that does not easily react with the superconductor powder and has good workability. Such materials include, for example, silver, silver alloys, gold, gold alloys, or those in which a sheath layer of these is arranged as an intermediate layer. Also, materials that function as stabilizing agents under the conditions of use are preferred.
この発明において、超電導体の粉末を金属シ−スで被覆
した複合材に施される塑性加工は、上述のように伸線加
工または伸線加工および平角／テーブ状の加工を含んだ
ものが好ましい。伸線加工は加工度８０％以上で施され
ることが好ましい。In this invention, the plastic working performed on the composite material made of superconductor powder coated with a metal sheath preferably includes wire drawing or wire drawing and rectangular/tabular processing as described above. . The wire drawing process is preferably performed at a working degree of 80% or more.
また平角あるいはテープ状の加工は加工度８０％以上で
施されることが好ましい。伸線加工は、通常ダイス引き
が採用されるが、ロールダイス、タークスロールなどの
方法でもよい。また平角あるいはテープ状の加工は、ロ
ール圧延が一般的であるが、プレス圧延、ターグスロー
ル圧延も採用される。Further, it is preferable that processing into a rectangular or tape shape is performed at a processing degree of 80% or more. For the wire drawing process, die drawing is usually employed, but methods such as roll die and Turk's roll may also be used. Further, for processing into a rectangular or tape shape, roll rolling is generally used, but press rolling and targs roll rolling are also employed.
また、この発明においては、複合材を塑性加工した後に
熱処理が行なわれるが、この熱処理後に、さらに伸線加
工または平角あるいはテープ状の加工と熱処理が繰返さ
れてもよい。Further, in the present invention, heat treatment is performed after the composite material is plastically worked, but after this heat treatment, wire drawing, rectangular or tape-shaped processing, and heat treatment may be repeated.
この発明において複合材を塑性加工後に熱処理する際の
熱処理温度は、通常７８０℃から８６０℃までの温度範
囲で、５時間から３００時間程度の条件が採用される。In the present invention, the heat treatment temperature when heat treating the composite material after plastic working is usually in the temperature range of 780°C to 860°C, and the conditions are adopted for about 5 hours to 300 hours.
この場合、雰囲気は大気中あるいは酸素分圧を制御した
条件が好ましい。In this case, it is preferable that the atmosphere be the air or a condition in which the partial pressure of oxygen is controlled.
［発明の作用効果］
この発明の製造方法では、原料粉末を予め８３０℃以上
の温度で熱処理して２２１２相を主体とするＢ ｉ−Ｐ
ｂ−Ｓ ｒ−Ｃａ−Ｃｕ−０系超電導体の粉末を調製し
、この調製した超電導体の粉末を金属シースで被覆して
いる。このような原料粉末の熱処理により、超電導体の
粉末は結晶粒の結合力が改良され、塑性加工後の熱処理
によって結晶粒が大きく成長し、粒界での結合面積を増
大させることができ、これによって臨界電流密度を向上
させることができる。また、塑性加工後の熱処理により
、超電導体の粉末は、２２１２相から２２２３相に変態
し、高温超電導相の割合が増加することによって、臨界
温度が高められるとともに、臨界電流密度も高められる
。[Operations and Effects of the Invention] In the production method of the present invention, raw material powder is heat-treated in advance at a temperature of 830°C or higher to produce B i-P mainly composed of 2212 phase.
A b-S r-Ca-Cu-0 based superconductor powder is prepared, and the prepared superconductor powder is covered with a metal sheath. Such heat treatment of the raw material powder improves the bonding strength of the crystal grains in the superconductor powder, and the heat treatment after plastic working allows the crystal grains to grow larger and increase the bonding area at the grain boundaries. The critical current density can be improved by Further, by the heat treatment after plastic working, the superconductor powder transforms from the 2212 phase to the 2223 phase, and by increasing the proportion of the high temperature superconducting phase, the critical temperature and critical current density are increased.
この発明では、金属シースで被覆した複合材に伸線加工
等の塑性加工を施している。塑性加工を施すことにより
、金属シース内の結晶は加工方向に配向し、また平角あ
るいはテープ状に加工することにより、金属シース内の
結晶は配向し緻密化して、臨界電流密度が高まる。特に
、平角あるいはテープ状に加工することにより、電流の
流れやすいａ−ｂ面が電流が流れる長手方向に揃うよう
配向させることができるので、より一層臨界電流密度を
高めることができる。In this invention, a composite material covered with a metal sheath is subjected to plastic working such as wire drawing. By performing plastic working, the crystals within the metal sheath are oriented in the working direction, and by working into a rectangular or tape shape, the crystals within the metal sheath are oriented and become denser, increasing the critical current density. In particular, by processing it into a rectangular or tape shape, the a-b plane, through which current flows easily, can be oriented so that it is aligned in the longitudinal direction through which current flows, so that the critical current density can be further increased.
この発明の製造方法によれば、高い臨界温度でかつ高い
臨界電流密度を有するＢｉ−Ｐｂ−Ｓｒ−Ｃａ−Ｃｕ−
０系超電導体を製造することができる。このためケーブ
ルやマグネット等に用いられる超電導体の製造方法とし
て有用なものである。According to the manufacturing method of the present invention, Bi-Pb-Sr-Ca-Cu-
0 series superconductor can be manufactured. Therefore, it is useful as a method for manufacturing superconductors used in cables, magnets, etc.
［実施例］
実施例１および比較例Ｉ
Ｂｉ２ ０，、ＰｂＯ、Ｓ ｒｃＯ， 、ＣａＣＯ３、
およびＣｕＯのそれぞれの粉末を用いて、Ｂｉ：Ｐｂ：
Ｓｒ：Ｃａ：Ｃｕ−１．８０：０．４１：１．９９：２
．２５：３．０２の組成比となるように混合した。この
混合粉末を７５０℃で１４時間仮焼した後、８６０℃で
１２時間熱処理を施した。得られた粉末は、超電導体の
粉末であり、２２１２相を主体とする粉末であった。（
実施例１）上記の実施例１と同様の組成比で各粉末を混
合し、７５０℃で１４時間仮焼した後、８００℃で１２
時間大気中で熱処理して、超電導体粉末を得た。この粉
末は２２１２相を主体とする粉末であった。（比較例１
）
上記の実施例１および比較例１の粉末をそれぞれ銀パイ
プ内に充填した後、９５％の伸線加工および８２％の圧
延加工を行なった。加工後、８４０℃で５０時間の熱処
理を施し、熱処理後２５％の圧延加工を施し、その後さ
らに８４３℃で５０時間の熱処理を施した。これらの臨
界温度は１０６Ｋであった。得られた超電導体について
、７７．３Ｋでの臨界電流密度を測定したところ、実施
例１の超電導体は２８４０ＯＡ／ｃｍ２であり、比較例
１の超電導体は６５００Ａ／Ｃｍ２であった。[Example] Example 1 and Comparative Example I Bi2 0,, PbO, S rcO, , CaCO3,
Using the respective powders of Bi:Pb:
Sr:Ca:Cu-1.80:0.41:1.99:2
．． They were mixed at a composition ratio of 25:3.02. This mixed powder was calcined at 750°C for 14 hours and then heat-treated at 860°C for 12 hours. The obtained powder was a superconductor powder, and was a powder mainly composed of 2212 phase. (
Example 1) Each powder was mixed in the same composition ratio as in Example 1 above, calcined at 750°C for 14 hours, and then heated at 800°C for 12 hours.
A superconductor powder was obtained by heat treatment in the atmosphere for an hour. This powder was mainly composed of 2212 phase. (Comparative example 1
) After each of the powders of Example 1 and Comparative Example 1 was filled into a silver pipe, 95% wire drawing and 82% rolling were performed. After processing, heat treatment was performed at 840°C for 50 hours, and after the heat treatment, 25% rolling was performed, and then further heat treatment was performed at 843°C for 50 hours. Their critical temperature was 106K. When the critical current density at 77.3K of the obtained superconductor was measured, the superconductor of Example 1 had a critical current density of 2840 OA/cm2, and the superconductor of Comparative Example 1 had a critical current density of 6500 A/cm2.
実施例２および比較例２
Ｂ ｉ２ ０， 、ＰｂＯＳＳ ｒｃＯ， 、ＣａＣＯ
，、およびＣｕＯのそれぞれの粉末を用いて、Ｂｉ：Ｐ
ｂ：Ｓｒ：Ｃａ：Ｃｕ−１．８４：０．３９：２．０３
：２．１８：２．９８の組成比となるように混合した。Example 2 and Comparative Example 2 B i2 0, , PbOSS rcO, , CaCO
, , and CuO, Bi:P
b:Sr:Ca:Cu-1.84:0.39:2.03
:2.18:2.98.
７５５℃で１２時間仮焼後、大気中で８１０℃１０時間
の熱処理をした後、さらに大気中で８５６℃１２時間の
熱処理を行なった。After calcining at 755°C for 12 hours, heat treatment was performed at 810°C for 10 hours in the air, and then heat treatment was further performed at 856°C for 12 hours in the air.
（実施例２）
上記の実施例２と同様の組成比となるようにそれぞれの
粉末を混合し、７５５℃で１２時間の仮焼後、大気中で
８１０℃で１０時間の熱処理を行ない、その後の８５６
℃１２時間の熱処理を行なわなかったものを比較として
調製した。（比較例２）
以上の実施例２および比較例２のそれぞれの粉末を、銀
バイブ内に充填し、９７％の伸線加工および８５％の圧
延加工をした後、８３５℃で８０時間の熱処理を施した
。次に、それぞれについて２３％の圧延加工を施し、８
４５℃で９０時間の熱処理をさらに施した。これらの臨
界温度は、１０６Ｋであった。得られたそれぞれの超電
導体について、７７．３Ｋで臨界電流密度を測定した。(Example 2) The respective powders were mixed to have the same composition ratio as in Example 2 above, and after calcining at 755°C for 12 hours, heat treatment was performed at 810°C for 10 hours in the air. 856
A sample without heat treatment for 12 hours at °C was prepared as a comparison. (Comparative Example 2) Each of the powders of Example 2 and Comparative Example 2 was filled into a silver vibrator, subjected to 97% wire drawing processing and 85% rolling processing, and then heat treatment at 835°C for 80 hours. was applied. Next, each was rolled by 23%, and 8
A further heat treatment was performed at 45° C. for 90 hours. Their critical temperature was 106K. The critical current density of each of the obtained superconductors was measured at 77.3K.
実施例２の超電導体は２９５０ＯＡ／ｃｍ２であり、比
較例２の超電導体は９８００Ａ／ｃｍ２であった。The superconductor of Example 2 was 2950 OA/cm2, and the superconductor of Comparative Example 2 was 9800 A/cm2.
実施例３および比較例３
Ｂｔ２ ０，、ＰｂＯ，ＳｒＣＯ，、ＣａＣＯ，、およ
びＣｕＯのそれぞれの粉末を用いて、Ｂｉ：Ｐｂ：Ｓｒ
：Ｃａ：Ｃｕ−１．８１：０．４０：２．０１：２．２
８：３．０２の組成比となるように混合した。この混合
粉末を、７５０℃で１２時間仮焼後、大気中で８００℃
１８時間の熱処理をした。さらにこの粉末に対して、８
５０℃２０時間の熱処理を施した。（実施例３）
上記の実施例３と同様の組成比で混合した粉末を、７５
０℃で１２時間の仮焼後、大気中で８００℃１８時間の
熱処理を施し、その後の８５０℃での熱処理を行なわな
い超電導体の粉末を作製した。（比較例３）
以上のようにして得られた実施例３および比較例３の粉
末をそれぞれ、湿式ボールミルにて粉砕し、平均粒径０
．９μｍの粉末を得た。実施例３の粉末に対しては、さ
らに８００℃１０分間の熱処理を加え、比較例３の粉末
に対してはこのような熱処理を施さずに、それぞれ銀パ
イプ中に充填して複合材とした。これらの複合材を９Ｑ
％の加工度で伸線加工した後、８４０℃で５０時間熱処
理した。その後、さらに４０％の加工度で伸線加工を行
ない、さらに８４５℃で５０時間の熱処理を施した。こ
れらの臨界温度は１０６Ｋであった。Example 3 and Comparative Example 3 Using powders of Bt20, PbO, SrCO, CaCO, and CuO, Bi:Pb:Sr
:Ca:Cu-1.81:0.40:2.01:2.2
They were mixed at a composition ratio of 8:3.02. This mixed powder was calcined at 750°C for 12 hours, and then heated to 800°C in the air.
Heat treatment was performed for 18 hours. Furthermore, for this powder, 8
Heat treatment was performed at 50°C for 20 hours. (Example 3) Powder mixed at the same composition ratio as in Example 3 above was mixed with 75
After calcination at 0°C for 12 hours, heat treatment was performed at 800°C for 18 hours in the air, and a superconductor powder was produced without subsequent heat treatment at 850°C. (Comparative Example 3) The powders of Example 3 and Comparative Example 3 obtained as described above were each ground in a wet ball mill, and the average particle size was 0.
．． A powder of 9 μm was obtained. The powder of Example 3 was further heat-treated at 800°C for 10 minutes, and the powder of Comparative Example 3 was filled into a silver pipe and made into a composite material without such heat treatment. . 9Q of these composite materials
%, and then heat treated at 840° C. for 50 hours. Thereafter, wire drawing was further performed at a processing degree of 40%, and heat treatment was further performed at 845° C. for 50 hours. Their critical temperature was 106K.
得られた超電導体について７７．３Ｋでの臨界電流密度
を測定した。実施例３の超電導体は４５００Ａ／ｃｍ２
であったのに対し、比較例３の超電導体は５００Ａ／ｃ
ｍ２であった。The critical current density at 77.3K of the obtained superconductor was measured. The superconductor of Example 3 is 4500A/cm2
On the other hand, the superconductor of Comparative Example 3 was 500A/c
It was m2.
以上の実施例１〜３と比較例１〜３の比較から明らかな
ように、この発明に従う製造方法で製造された超電導体
は、いずれも高い臨界電流密度を示す。As is clear from the comparison of Examples 1 to 3 and Comparative Examples 1 to 3 above, all superconductors manufactured by the manufacturing method according to the present invention exhibit high critical current densities.
Claims (6)
を主体とするＢｉ系超電導体の粉末を調製し、 前記超電導体の粉末を金属シースで被覆して複合材とし
、 前記複合材を塑性加工した後熱処理する各工程を備える
、超電導体の製造方法。(1) A method for producing a Bi-based superconductor, in which a raw material powder is heat-treated at a temperature of 830° C. or higher to prepare a Bi-based superconductor powder mainly composed of 2212 phase, and the superconductor powder is mixed with a metal. A method for manufacturing a superconductor, comprising the steps of: covering with a sheath to make a composite material; plastically working the composite material; and then heat treating the composite material.
で熱処理する、請求項１に記載の超電導体の製造方法。(2) The method for producing a superconductor according to claim 1, wherein the raw material powder is heat-treated at a temperature of 830°C or higher and 870°C or lower.
求項１に記載の超電導体の製造方法。(3) The method for manufacturing a superconductor according to claim 1, wherein the heat treatment of the raw material powder is for 24 hours or less.
８〜２．２：１．８〜２．５：２．５〜３．５と酸素で
ある、請求項１に記載の超電導体の製造方法。(4) The composition ratio of the Bi-based superconductor is Bi+Pb:Sr:Ca:Cu=1.5 to 2.5:1.
8-2.2: 1.8-2.5: 2.5-3.5 and oxygen, the method for manufacturing a superconductor according to claim 1.
角／テープ状の加工を含む、請求項１に記載の超電導体
の製造方法。(5) The method for manufacturing a superconductor according to claim 1, wherein the plastic working includes wire drawing or wire drawing and rectangular/tape processing.
項１に記載の超電導体の製造方法。(6) The method for manufacturing a superconductor according to claim 1, wherein the plastic working and heat treatment are repeated multiple times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00945990A JP3149429B2 (en) | 1990-01-17 | 1990-01-17 | Superconductor manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00945990A JP3149429B2 (en) | 1990-01-17 | 1990-01-17 | Superconductor manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03214516A true JPH03214516A (en) | 1991-09-19 |
| JP3149429B2 JP3149429B2 (en) | 2001-03-26 |
Family
ID=11720871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00945990A Expired - Lifetime JP3149429B2 (en) | 1990-01-17 | 1990-01-17 | Superconductor manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3149429B2 (en) |
-
1990
- 1990-01-17 JP JP00945990A patent/JP3149429B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3149429B2 (en) | 2001-03-26 |
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