JPH0393619A - Production of y-ba-cu-o superconductor - Google Patents
Production of y-ba-cu-o superconductorInfo
- Publication number
- JPH0393619A JPH0393619A JP1228296A JP22829689A JPH0393619A JP H0393619 A JPH0393619 A JP H0393619A JP 1228296 A JP1228296 A JP 1228296A JP 22829689 A JP22829689 A JP 22829689A JP H0393619 A JPH0393619 A JP H0393619A
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- cuo
- current density
- critical current
- melting
- 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 22
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 6
- 229910009203 Y-Ba-Cu-O Inorganic materials 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 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
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、Ｙ−Ｂａ−Ｃｕ−０系超電導体の臨界電流密
度の向上を図る、超電導体の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for manufacturing a Y-Ba-Cu-0 superconductor that improves the critical current density of the superconductor.
（従来の技術）
酸化物超電導体の製造方法のうち、溶融法では緻密化、
結晶の一方向凝固等が可能であり、従来の固相反応と比
較してＪｃの向上が期待されている。Ｙ−Ｂａ−Ｃｕ−
０系超電導体（ＹＢａｚｃｕ３０７−δ）を溶融法によ
って作成することにより、強磁場下においても高い臨界
電流密度（Ｊ ｃ）が得られている。例えば、溶融状態
から急冷した後、熱処理を施すＱＭＧ法などがある。(Conventional technology) Among the manufacturing methods of oxide superconductors, the melting method requires densification,
Unidirectional solidification of crystals is possible, and an improvement in Jc is expected compared to conventional solid phase reactions. Y-Ba-Cu-
By creating a 0-series superconductor (YBazcu307-δ) by a melting method, a high critical current density (Jc) has been obtained even under a strong magnetic field. For example, there is a QMG method in which heat treatment is performed after rapid cooling from a molten state.
（発明が解決しようとする問題点）
しかし、Ｙ−Ｂ ａ −Ｃ ｕ−０系超電導体は溶融域
でＣ ｕ Ｏ １Ｂ ａ Ｃ ｕ Ｏ ２、Ｙ ２ Ｂ
ａ Ｃ ｕ Ｏ ５の析出があるｏＹｚＢａｃｕ０５
はＹＢａｚｃｕ３０７−δマトリックス中に均一かつ微
細に分散させることにより磁束のピン止め中心となりう
るが、ＣｕＯ、Ｂ ａ Ｃ ｕ ０２は偏析し易く、臨
界電流密度を低下させる原因となり、これらのＣ ｕ
Ｏ％ Ｂ ａ Ｃ ｕ ０２、ＹｚＢａＣｕＯｓの処理
が大きな課題である。(Problems to be Solved by the Invention) However, Y-B a -C u-0 based superconductors have C u O 1 B a C u O 2, Y 2 B in the melting region.
a There is precipitation of C u O 5 oYzBacu05
can serve as a pinning center for magnetic flux by uniformly and finely dispersing it in the YBazcu307-δ matrix, but CuO and B a Cu 02 tend to segregate and cause a decrease in the critical current density.
0% Ba Cu 02, processing of YzBaCuOs is a major challenge.
第３図の状態図に示すように、ＹＢａｚＣｕａＯ７−δ
超電導体の溶融域においては、Ｙ２ＢａＣｕ０ ６、Ｂ
ａ Ｃ ｕ ０ ２、Ｃ ｕ Ｏなどが生成すること
が知られているｏ Ｙ２Ｂ ａ Ｃ ｕ ＯｓはＹＢａ
ｚｃｕ３０７−δ結晶内に均一かつ微細に分散させるこ
とにより磁束のピン止め中心となるが、ＣｕＯ１ＢａＣ
ｕＯ２などは、第２図に示すように、偏析し易く、臨界
電流密度、臨界温度を大きく劣化させる原因となる。As shown in the phase diagram of Fig. 3, YBazCuaO7-δ
In the melting region of the superconductor, Y2BaCu0 6,B
a C u 0 2, C u O, etc. are known to be generated o Y2B a C u Os is YBa
By uniformly and finely dispersing it within the zcu307-δ crystal, it becomes a pinning center for magnetic flux, but CuO1BaC
As shown in FIG. 2, uO2 and the like are easily segregated and cause significant deterioration of critical current density and critical temperature.
本発明は、溶融域においてＣｕｂ、ＢａＣｕＯ２の生成
を押え、有効にＹ２Ｂ ａ Ｃ ｕ Ｏｓを析出させる
ことにより臨界電流密度を向上させることを目的とする
。The present invention aims to improve the critical current density by suppressing the formation of Cub and BaCuO2 in the melting region and effectively precipitating Y2B a Cu Os.
［発明の構成］
（問題点を解決するための手段）
上記問題点を解決するために、Ｙ−Ｂ ａ −Ｃ ｕ
−Ｏ系超電導体材料の組成として
ＹＢａｘｃｕｙｏｙ−δ
１．４４≦ｘ≦１．７５
２．１≦ｙ≦２．５８
となるような組成の超電導体材料に溶融法を用いること
により臨界電流密度の大きい超電導体を作成する。[Structure of the invention] (Means for solving the problems) In order to solve the above problems, Y-B a -C u
The critical current density can be reduced by using a melting method on a superconductor material whose composition is YBaxcuyoy-δ 1.44≦x≦1.75 2.1≦y≦2.58. Create large superconductors.
（作用）
Ｙ２Ｂ ａ Ｃ ｕ ＯｓはＹＢａｚＣｕａＯｙ−δよ
り生成したものとすると、次式の反応が考えられる。(Operation) Assuming that Y2B a Cu Os is generated from YBazCuaOy-δ, the following reaction can be considered.
ＹＢａｚＣｕ３０７−δ→（１７２） Ｙ２Ｂ ａ Ｃ
ｕ ０５＋ （３／２）ＢａＣｕＯ２＋ＣｕＯ
これは、もとの組成が、
Ｙ：Ｂａ：Ｃｕ＝１：２：３
であれば、Ｙ２ＢａＣｕＯｓ析出の際、Ｂａｃｕ０２、
ＣｕＯの生成が必然であることを示している。したがっ
て、本発明においては、ＹＢａ２Ｃｕ３０７−δ中にＹ
２Ｂ ａ Ｃ ｕ ０５を分散させ、かつＢａＣｕＯ２
、ＣｕＯの生成を抑えるために、もとの組成を以下のご
とく変化させることとした。YBazCu307-δ→(172) Y2B a C
u 05+ (3/2)BaCuO2+CuO This means that if the original composition is Y:Ba:Cu=1:2:3, Bacu02,
This shows that the production of CuO is inevitable. Therefore, in the present invention, Y
2B a Cu 05 is dispersed and BaCuO2
In order to suppress the formation of CuO, the original composition was changed as follows.
ビン止め中心として析出させるＹ２Ｂ ａ Ｃ ｕ ０
５はＹＢａ２Ｃｕ３０７−δに対し、１０〜３０ｆｆ１
０１％が適量である。Y2B a C u 0 to be deposited as the center of bottle fixing
5 is 10 to 30ff1 for YBa2Cu307-δ
01% is an appropriate amount.
Ｙ２Ｂ ａ Ｃ ｕ Ｏｓが１ ０ｍｏｌ％、ＹＢ ａ
ｚｃ ｕ３０７一δに対し析出したとき
ＹｚＢａＣｕＯｓ： ＹＢａ２Ｃｕ３０ｙ−δ＝０．１
：１．０
したがって、合わせた組成は
Ｙｌ．２Ｂ ａ２．＋ｃ ｕ３．＋０７−δＹ＝１とす
ると
Ｙ Ｂ ａ ｌ．７５ｃ ｕｚ．ｓａＯｙ−δとなる。Y2B a C u Os is 10 mol%, YB a
YzBaCuOs when deposited for zc u307-δ: YBa2Cu30y-δ=0.1
:1.0 Therefore, the combined composition is Yl. 2B a2. +c u3. If +07−δY=1, Y B a l. 75cuz. saOy−δ.
同様に、３０ｍｏｌ％のとき ＹＢ ａ＋．４ａｃ ｕ２．＋ｏｒ−δとなる。Similarly, when 30 mol% YB a+. 4ac u2. +or-δ.
以上より、本発明の超電導体材料の組成はＹＢａｘＣｕ
ｙｏｙ−δ
１．４４≦ｘ≦１．７５
２．１≦Ｖ≦２．５８
この組成の超電導体材料に溶融法を用いることにより臨
界電流密度の大きい超電導体を作成することができる。From the above, the composition of the superconductor material of the present invention is YBaxCu
yoy-δ 1.44≦x≦1.75 2.1≦V≦2.58 A superconductor with a high critical current density can be created by using a melting method for a superconductor material having this composition.
（実施例） 以下、本発明の実施例について説明する。(Example) Examples of the present invention will be described below.
■Ｙ２０ａ、ＢａＣｕＯａ、ＣｕＯを
Ｙ：Ｂａ：Ｃｕ＝１ ： １．７７：２．８３の比にな
るように混合する。これを８００〜８５０℃で酸素中で
仮焼する。(2) Mix Y20a, BaCuOa, and CuO in a ratio of Y:Ba:Cu=1:1.77:2.83. This is calcined in oxygen at 800-850°C.
■■の仮焼粉を１０００〜１０３０℃に昇温し、部分溶
融させた後、９７５℃に急速に降温し、この温度で２０
時間保持した。その後、１５０℃／ｈで室温まで温度を
下げる。The temperature of the calcined powder of
Holds time. Thereafter, the temperature is lowered to room temperature at a rate of 150°C/h.
■■、■により作成された試料はＹＢａ２ｃｕ３０７−
δの結晶が大きく成長し、その中にＹ２Ｂ ａＣｕｂｓ
が微細に分散した組織となる。粒界およびＹ２Ｂ ａ
Ｃ ｕ ０５の周辺にＢａＣｕＯ２、ＣｕＯなどの偏析
はなく、第１図に示すように、ビン止め中心となるＹ２
Ｂ ａ Ｃ ｕ ＯｓをＹＢａｚｃｕ３０ｙ一δと表記
）の結晶中に良好に分散できた。これにより、ＩＴの磁
場下で１ ０ ’ Ａ／０１１１２の臨界電流密度をも
つ超電導体が得られた。The sample prepared by ■■ and ■ is YBa2cu307-
The crystal of δ grows large, and Y2B aCubs are inside it.
becomes a finely dispersed structure. Grain boundaries and Y2B a
There is no segregation of BaCuO2, CuO, etc. around Cu 05, and as shown in Figure 1, Y2, which is the center of the bottle fixation,
B a Cu Os was successfully dispersed in the crystal of YBazcu30y-δ). As a result, a superconductor with a critical current density of 10' A/01112 under the IT magnetic field was obtained.
［発明の効果］
本発明の組成の超電導材料に溶融法を用いることにより
臨界電流密度の大きい超電導体を製造することができる
。[Effects of the Invention] A superconductor with a high critical current density can be manufactured by using a melting method for a superconducting material having the composition of the present invention.
第１図は本発明の製造方法により作られた超電導体の韓
織図、第２図は従来の製造方法により作られた超電導体
の組織図、第３図はＹ２Ｂ ａ Ｃ ｕＯ５超電導体の
状態図である。
１−ＹＢａ２Ｃｕ３０７−δ、２−ｙｚｓ ａ Ｃ ｕ
０５、３・・・結晶粒界、
４・・・ＣｕＯ、
５・ ＢａＣｕＯ２。
第１図
第２図Figure 1 is a Hanori diagram of a superconductor made by the manufacturing method of the present invention, Figure 2 is an organizational diagram of a superconductor made by a conventional manufacturing method, and Figure 3 is a state of the Y2B a CuO5 superconductor. It is a diagram. 1-YBa2Cu307-δ, 2-yzs a Cu
05, 3... Grain boundary, 4... CuO, 5. BaCuO2. Figure 1 Figure 2
Claims (1)
＿７−δの製造において、１．４４≦ｘ≦１．７５、２
．１≦ｙ≦２．５８となる組成の超電導体材料に溶融法
を用いることを特徴とするＹ−Ｂａ−Ｃｕ−Ｏ系超電導
体の製造方法。Y-Ba-Cu-O superconductor, YBa_xCu_yO
In the production of _7-δ, 1.44≦x≦1.75, 2
．． A method for manufacturing a Y-Ba-Cu-O based superconductor, characterized in that a melting method is used for a superconductor material having a composition such that 1≦y≦2.58.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1228296A JPH0393619A (en) | 1989-09-05 | 1989-09-05 | Production of y-ba-cu-o superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1228296A JPH0393619A (en) | 1989-09-05 | 1989-09-05 | Production of y-ba-cu-o superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0393619A true JPH0393619A (en) | 1991-04-18 |
Family
ID=16874242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1228296A Pending JPH0393619A (en) | 1989-09-05 | 1989-09-05 | Production of y-ba-cu-o superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0393619A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5736489A (en) * | 1997-02-07 | 1998-04-07 | Wright State University | Method of producing melt-processed polycrystalline YBa2 Cu3 O.sub. |
-
1989
- 1989-09-05 JP JP1228296A patent/JPH0393619A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5736489A (en) * | 1997-02-07 | 1998-04-07 | Wright State University | Method of producing melt-processed polycrystalline YBa2 Cu3 O.sub. |
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