JP2597844B2 - Superconductor manufacturing method - Google Patents
Superconductor manufacturing methodInfo
- Publication number
- JP2597844B2 JP2597844B2 JP62125832A JP12583287A JP2597844B2 JP 2597844 B2 JP2597844 B2 JP 2597844B2 JP 62125832 A JP62125832 A JP 62125832A JP 12583287 A JP12583287 A JP 12583287A JP 2597844 B2 JP2597844 B2 JP 2597844B2
- Authority
- JP
- Japan
- Prior art keywords
- superconductor
- producing
- group
- superconductor according
- 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.)
- Expired - Lifetime
Links
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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は超電導体の製造方法、さらに詳しく云えば、
配合原料を溶融し、徐冷してつくることを特徴とする製
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a superconductor, more specifically,
The present invention relates to a production method characterized by melting and slowly cooling a compounding raw material.
超電導体は電気抵抗ゼロで電流が流れるという特性か
ら、マグネット，電力貯蔵，ジョセフソン素子等多くの
分野への利用が想定され、将来の技術を鍵を把る材料と
して、最近多方面で研究開発されている。Superconductors have the property that current flows at zero electrical resistance, so they are expected to be used in many fields, such as magnets, power storage, and Josephson devices. Have been.
その超電導体の材料としてセラミックス系（たとえば
La−Sr−Cu−Ｏ系,Y−Ba−Cu−Ｏ系）のものが着目され
ている。Ceramic materials (for example,
(La-Sr-Cu-O system, Y-Ba-Cu-O system) are attracting attention.
そのセラミックス系超電導体は通常焼結法で製造され
ている。すなわち所定の元素を含む化合物を混合し、加
圧成形したのち、約1000℃で焼結し、冷却し、アニール
処理する方法である。The ceramic superconductor is usually manufactured by a sintering method. That is, a compound containing a predetermined element is mixed, molded under pressure, sintered at about 1000 ° C., cooled, and annealed.
前記焼結法は得られる超電導体を最密にする必要か
ら、加圧してつくった成形体を長時間、少なくとも数日
以上にわたって焼結しなければならず、原料配合から最
終製品を得るまでの時間がかかり過ぎる欠点を有してい
た。Since the sintering method requires the obtained superconductors to be densest, the compact formed by pressing must be sintered for a long time, at least several days or more, until the final product is obtained from the blending of the raw materials. It had the disadvantage of taking too much time.
そこで本発明者らは焼結法に比較して短時間で超電導
体を製造する方法について研究した結果、配合原料を溶
融冷却し、一旦徐冷したのちアニール処理を行なうこと
により、著しく製造時間を短縮できることを見い出し
て、以下の発明を完成させた。Therefore, the present inventors have studied a method for manufacturing a superconductor in a shorter time than the sintering method.As a result, the manufacturing time is significantly reduced by melting and cooling the compounded raw material, annealing gradually, and then annealing. Having found that it could be shortened, they completed the following invention.
すなわち本発明の要旨は周期律表のII−Ａ族の元素を
含んだ酸化物または炭酸塩、同様にIII−Ａ族の元素を
含んだ酸化物または炭酸塩および銅を含んだ酸化物また
は炭酸塩を各元素および銅を超電導体中で所定の割合に
なるように配合し、混合してからその配合物を完全に溶
融したのち、一旦室温まで徐冷し、アニール処理してつ
くる超電導体の製造方法である。That is, the gist of the present invention is to provide an oxide or carbonate containing an element of Group II-A of the periodic table, as well as an oxide or carbonate containing an element of Group III-A and an oxide or carbonate containing copper. The salt is blended so that each element and copper are mixed in a prescribed ratio in the superconductor, and after mixing, the mixture is completely melted, then gradually cooled to room temperature, and then annealed. It is a manufacturing method.
以下本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明で使用される周期律表II−Ａ族の元素にはCa,S
r,Ba等、III−Ａ族の元素にはSc,YおよびLaなどの希土
類等の各種金属元素が挙げられる。The elements of Group II-A of the periodic table used in the present invention include Ca, S
Group III-A elements such as r and Ba include various metal elements such as rare earths such as Sc, Y and La.
上記の各元素または銅を含む化合物には酸化物，炭酸
塩，硫酸塩，硝酸塩，酢酸塩などが示されるが、好まし
いものとしては酸化物および炭酸塩である。The compounds containing each of the above elements or copper include oxides, carbonates, sulfates, nitrates, acetates and the like, and preferred are oxides and carbonates.
上記の各化合物は最終的に得られる超電導体を構成す
る金属元素の比が所定の割合になるように配合し、混合
される。混合された配合物は電気炉等慣用の装置によっ
て加熱され溶融する。その加熱温度は配合物全体が完全
に溶融する、換言すれば元素が原子レベルで混ざり合う
ような粘性の溶融物になる温度であればよく、その保持
時間は数時間程度で十分である。なお、加熱温度は配合
物の組成によって適宜に決めればよいが、その温度につ
いて本発明では特に限定しない。Each of the above compounds is blended and mixed so that the ratio of the metal elements constituting the finally obtained superconductor becomes a predetermined ratio. The mixed composition is heated and melted by a conventional device such as an electric furnace. The heating temperature may be a temperature at which the entire composition is completely melted, in other words, a temperature at which a viscous melt in which the elements are mixed at the atomic level is obtained, and a holding time of about several hours is sufficient. The heating temperature may be appropriately determined depending on the composition of the composition, but the temperature is not particularly limited in the present invention.
得られた溶融物は冷却される。冷却方法は、たとえば
該加熱装置内に溶融状態のまま放置して冷却（徐冷）す
る方法、あるいは該装置から溶融物を取り出して大気中
で放冷（徐冷）する方法が例示される。The resulting melt is cooled. Examples of the cooling method include a method of cooling (gradual cooling) by leaving the molten state in the heating device or a method of taking out the melt from the device and allowing it to cool in the atmosphere (gradual cooling).
冷却された溶融物は結晶化し、ペロブスカイト型結晶
構造になり、超電導性を示すが、さらに安定化を向上さ
せるために電気炉等を用いて800〜950℃数時間空気中又
は酸素雰囲気中でアニール処理される。The cooled melt crystallizes to form a perovskite-type crystal structure and exhibits superconductivity, but is further annealed in air or an oxygen atmosphere at 800 to 950 ° C for several hours using an electric furnace or the like to further improve stabilization. It is processed.
以上の製法によって得られるセラミックス系超電導体
としてはBa−La−Cu−Ｏ系,Sr−La−Cu−Ｏ系,Ca−La−
Cu−Ｏ系,Ba−Ｙ−Cu−Ｏ系,Ba−Yb−Cu−Ｏ系,Ba−Tm
−Cu−Ｏ系,Ba−Er−Cu−Ｏ系等のものが示される。本
発明では各系の元素比は特に限定しない。As the ceramic-based superconductor obtained by the above-described method, Ba-La-Cu-O-based, Sr-La-Cu-O-based, and Ca-La-
Cu-O system, Ba-Y-Cu-O system, Ba-Yb-Cu-O system, Ba-Tm
-Cu-O type, Ba-Er-Cu-O type and the like are shown. In the present invention, the element ratio of each system is not particularly limited.
以下の要領によってBa2YCu3O6.5組成の超電導体を製
造し、その臨界温度を測定した。A superconductor having a composition of Ba 2 YCu 3 O 6.5 was manufactured according to the following procedure, and its critical temperature was measured.
BaCo3（純度99.9wt％）,Y2O3（純度99.99wt％）およ
びCuO（純度99.99wt％）の化合物をそれぞれ２モル,1/2
モルおよび３モルの割合で配合し、乳鉢で十分混合して
全量で100gの配合物を得た。Compounds of BaCo 3 (purity 99.9wt%), Y 2 O 3 (purity 99.99wt%) and CuO (purity 99.99wt%) are each 2 mol, 1/2
And 3 moles, and thoroughly mixed in a mortar to give a total of 100 g of the formulation.
この配合物を白金ルツボに入れ電気炉に挿入し、1400
℃、２時間加熱して完全に溶融させた。その後電気炉の
電源を切り、炉内で室温まで６時間かけて冷却した。Put this composition in a platinum crucible, insert it into an electric furnace,
C. for 2 hours for complete melting. Thereafter, the power of the electric furnace was turned off, and the furnace was cooled to room temperature over 6 hours.
次いで、その冷却物を900℃の電気炉中に挿入し48時
間空気中でアニール処理した。Next, the cooled product was inserted into an electric furnace at 900 ° C. and annealed in air for 48 hours.
かくして得られた超電導体から１×３×8mmの大きさ
の試料片を作製した。A sample piece of 1 × 3 × 8 mm was prepared from the superconductor thus obtained.
この試料片を直流四端子法によって、低温における電
気抵抗を測定し、得られた結果を表１に示した。なお温
度は、金−アルメル熱電対を用いて測定した。The electrical resistance of this sample piece at a low temperature was measured by a DC four-terminal method, and the obtained results are shown in Table 1. The temperature was measured using a gold-alumel thermocouple.
この結果、本発明の製法によって得られたBa2YCu3O
6.5の組成からなる超電導体の臨界温度は88Kであった。As a result, Ba 2 YCu 3 O obtained by the production method of the present invention
The critical temperature of the superconductor having the composition of 6.5 was 88K.
同上組成について焼結法で製造した超電導体の臨界温
度は85Kであった。The critical temperature of the superconductor manufactured by the sintering method for the same composition was 85K.
〔発明の効果〕 本発明は超電導体を製造するにあたり、配合原料を溶
融する方法を採用したことにより、成形体を焼結してつ
くる従来法が数日を要したのと比較して、僅か数時間で
製造できる。したがって生産性が著しく向上し、熱エネ
ルギーが節約されるうえに、臨界温度も数Ｋ上昇するメ
リットを有している。 [Effects of the Invention] The present invention employs a method of melting compounding raw materials in manufacturing a superconductor, so that the conventional method of sintering a molded body requires several days, Can be manufactured in a few hours. Therefore, productivity is remarkably improved, thermal energy is saved, and the critical temperature is increased by several K.
フロントページの続き 審査官 近野 光知 (56)参考文献 Ｊａｐａｎｅｓｅ Ｊｏｕｒｎａｌ ｏｆ Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃ ｓ，Ｖｏｌ．26，Ｎｏ．４ ＰＰ．Ｌ 358−360 Ｊａｐａｎｅｓｅ Ｊｏｕｒｎａｌ ｏｆ Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃ ｓ，Ｖｏｌ．26，Ｎｏ．４ ＰＰ．Ｌ 311−313Continuing from the front page Examiner Kochi Chino (56) References Japanese Journal of Applied Physics, Vol. 26, No. 4 PP. L 358-360 Japanese Journal of Applied Physics, Vol. 26, No. 4 PP. L 311-313
Claims (9)
素を含むそれぞれの酸化物または炭酸塩ならびに銅を含
む酸化物または炭酸塩の配合物を混合し、溶融したのち
徐冷し、アニール処理することを特徴とする超電導体の
製造方法。A mixture of each oxide or carbonate containing an element of group II-A and group III-A of the periodic table and an oxide or carbonate containing copper are melted and then slowly cooled. And producing a superconductor by annealing.
選ばれた１種以上である特許請求の範囲第１項記載の超
電導体の製造方法。2. The method for producing a superconductor according to claim 1, wherein the element of Group II-A of the periodic table is at least one element selected from Ca, Sr, and Ba.
ら選ばれた１種以上である特許請求の範囲第１項記載の
超電伝導体の製造方法。3. The method according to claim 1, wherein the group III-A element of the periodic table is at least one selected from Sc, Y and La.
Ａ族の元素がＹである特許請求の範囲第１項記載の超電
導体の製造方法。4. The method according to claim 1, wherein said group II-A element is Ba and said III-
The method for producing a superconductor according to claim 1, wherein the group A element is Y.
む酸化物および銅を含む酸化物である特許請求の範囲第
１項記載の超電導体の製造方法。5. The method for producing a superconductor according to claim 1, wherein the compounds to be mixed are a carbonate containing Ba, an oxide containing Y and an oxide containing copper.
ある特許請求の範囲第１項記載の超電導体の製造方法。6. The method for producing a superconductor according to claim 1, wherein the compound to be mixed is BaCo3, Y2O3 and CuO.
より徐冷される特許請求の範囲第１項記載の超電導体の
製造方法。7. The method for producing a superconductor according to claim 1, wherein the melt is gradually cooled by being left in a molten state.
囲第１項記載の超電導体の製造方法。8. The method for manufacturing a superconductor according to claim 1, wherein the melt is gradually cooled in the atmosphere.
される特許請求の範囲第１項の超電導体の製造方法。9. The method for manufacturing a superconductor according to claim 1, wherein annealing is performed in air or an oxygen atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125832A JP2597844B2 (en) | 1987-05-25 | 1987-05-25 | Superconductor manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125832A JP2597844B2 (en) | 1987-05-25 | 1987-05-25 | Superconductor manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63291815A JPS63291815A (en) | 1988-11-29 |
| JP2597844B2 true JP2597844B2 (en) | 1997-04-09 |
Family
ID=14920041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62125832A Expired - Lifetime JP2597844B2 (en) | 1987-05-25 | 1987-05-25 | Superconductor manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2597844B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02307810A (en) * | 1989-05-18 | 1990-12-21 | Ngk Insulators Ltd | Production of oxide superconductor structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63288943A (en) * | 1987-05-20 | 1988-11-25 | Sumitomo Electric Ind Ltd | Production of superconducting material |
-
1987
- 1987-05-25 JP JP62125832A patent/JP2597844B2/en not_active Expired - Lifetime
Non-Patent Citations (2)
| Title |
|---|
| Ｊａｐａｎｅｓｅ Ｊｏｕｒｎａｌ ｏｆ Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃｓ，Ｖｏｌ．２６，Ｎｏ．４ ＰＰ．Ｌ３１１−３１３ |
| Ｊａｐａｎｅｓｅ Ｊｏｕｒｎａｌ ｏｆ Ａｐｐｌｉｅｄ Ｐｈｙｓｉｃｓ，Ｖｏｌ．２６，Ｎｏ．４ ＰＰ．Ｌ３５８−３６０ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63291815A (en) | 1988-11-29 |
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