JPS63277554A - Oxide superconductive ceramic linear sintered material and production thereof - Google Patents
Oxide superconductive ceramic linear sintered material and production thereofInfo
- Publication number
- JPS63277554A JPS63277554A JP62112721A JP11272187A JPS63277554A JP S63277554 A JPS63277554 A JP S63277554A JP 62112721 A JP62112721 A JP 62112721A JP 11272187 A JP11272187 A JP 11272187A JP S63277554 A JPS63277554 A JP S63277554A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- sintered material
- powder
- linear
- copper
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 title abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 13
- 239000007788 liquid Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229920000954 Polyglycolide Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical class OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000004633 polyglycolic acid Substances 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052718 tin 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
【発明の詳細な説明】
「産業上の利用分野」
本発明は、高い臨界温度を有する］Ｉａ金金属銅、ＩＩ
Ｉａ属金属から構成された、ペロブスカイト型金属酸化
物超電導セラミックス焼結体及びその製造方法に関する
もので、特に大きな臨界電流値が得られるように電流の
流す方向に対してＣ軸が放射状に配向された焼結体及び
該焼結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 is directed to Ia gold metal copper having a high critical temperature, IIa gold metal copper,
This relates to a perovskite-type metal oxide superconducting ceramic sintered body composed of a group Ia metal and a method for producing the same, in which the C-axis is oriented radially with respect to the direction of current flow so as to obtain a particularly large critical current value. The present invention relates to a sintered body and a method for manufacturing the sintered body.
「従来技術と問題点」
Ｉ［ａ金属、銅、ＩＩＩａ属金属から構成されたペロブ
スカイト型金属酸化物起電導セラミックスは、今までの
最高の臨界転移温度であったＮｂｆｆＧ１１（２３，２
Ｋ）を大幅に趨える高い臨界転移温度が発見されて以来
各方面で注目されている。"Prior Art and Problems" Perovskite-type metal oxide conductive ceramics composed of I[a metal, copper, and IIIa group metal have the highest critical transition temperature up to now, NbffG11 (23,2
Since the discovery of a high critical transition temperature that significantly exceeds K), it has attracted attention in various fields.
特に、この組成においてＩＩＩａ属金属としてイツトリ
ウムやランタン系希土類金属を用いた化合物は臨界転移
温度が液体窒素の沸点（７７，３Ｋ）を超えるものが得
られており、冷却材として希少資源であり、しかも約２
０倍も高価な液体ヘリウムにかわって安価で冷却効率の
よい液体窒素が使えるので、半導体デバイス、超電導磁
石、エネルギ−貯蔵等の大幅な用途の拡大が期待できる
。In particular, compounds using yttrium or lanthanum-based rare earth metals as group IIIa metals in this composition have been obtained with critical transition temperatures exceeding the boiling point of liquid nitrogen (77.3K), and are rare resources as coolants. And about 2
Since liquid nitrogen, which is inexpensive and has good cooling efficiency, can be used instead of liquid helium, which is 0 times more expensive, it is expected that applications such as semiconductor devices, superconducting magnets, and energy storage will be greatly expanded.
しかし、この酸化物超電導性セラミックスは高い臨界転
移温度と高い臨界磁場が得られるという優れた長所を有
しているが、従来のＮｂ、ＱｅやＮｂ、Ｓｎに比べて極
めて小さな臨界電流しか得られていないという問題点を
有しており、この欠点が実用に際しての大きな障害にな
っている。However, although this oxide superconducting ceramic has the excellent advantages of being able to obtain a high critical transition temperature and a high critical magnetic field, it can only obtain an extremely small critical current compared to conventional Nb, Qe, Nb, and Sn. This drawback is a major obstacle to practical use.
この酸化物ａｔ導性セラミックスは層状構造を有するペ
ロブスカイト型化合物であり、超電導性は銅−酸素の八
面体構造の繋がっている部分により発生していると言わ
れており、結晶学的に超電導性の異方性があり、ａ、ｂ
軸方向に超を導性がある。このため、通常のセラミック
スの焼結方法によって得られる多結晶体では、超１ｉ導
性を持つ結晶軸が揃っておらず臨界電流値が低くなり、
更に高い臨界電流値を得るためにはＣ軸方向の揃った多
結晶体を作り、超電導性の得られるａ、ｂ軸方向に電流
を流す必要がある。This oxide at conductive ceramic is a perovskite compound with a layered structure, and its superconductivity is said to occur due to the connected parts of the copper-oxygen octahedral structure. There is anisotropy of a, b
Super conductive in the axial direction. For this reason, in polycrystalline bodies obtained by ordinary ceramic sintering methods, the crystal axes with super 1i conductivity are not aligned, resulting in a low critical current value.
In order to obtain an even higher critical current value, it is necessary to create a polycrystalline body with aligned C-axis directions and to flow current in the a- and b-axis directions where superconductivity can be obtained.
本発明者らはこのｌｌａ金属、銅、ｌｌａｌ金属から構
成された、ペロブスカイト型金属酸化物趨電導性セラミ
ックスの臨界電流値を向上させる検討を進めているなか
で、この結晶体がａ、ｂ軸方向に襞間面を持った構造を
有しており、原料の製造方法によっては雲母状あるいは
鱗片状のＣ軸に配向しやすい粉末が得られることを見出
し、更に、特定のアスペクト比を有するこの酸化物超電
導性粉末を用いて有機バインダーを加えて機械的ストレ
スをかけてシート状に成形し、更に線状に成形して焼結
させることにより著しく臨界電流値の向上した焼結体が
得られることを見出し、本発明に到達した。The present inventors are proceeding with studies to improve the critical current value of perovskite-type metal oxide conductive ceramics composed of lla metal, copper, and llal metal, and found that this crystal body It has a structure with interfold planes in the direction, and it was discovered that depending on the manufacturing method of the raw material, it is possible to obtain a powder that is easily oriented along the C-axis in a mica-like or scale-like manner. By using oxide superconducting powder, adding an organic binder, applying mechanical stress, forming it into a sheet shape, and then forming it into a linear shape and sintering it, a sintered body with a significantly improved critical current value can be obtained. They discovered this and arrived at the present invention.
「問題点を解決するための手段」
本発明は、特定の結晶軸が配向して臨界電流値の向上し
た酸化物超電導性セラミックス線状焼結体及びその製造
方法に関するものである。"Means for Solving the Problems" The present invention relates to an oxide superconducting ceramic linear sintered body in which specific crystal axes are oriented and the critical current value is improved, and a method for manufacturing the same.
更に詳しくは、本発明の第１は、電流を流す方向に対し
て放射状にＣ軸が配向されていることを特徴とする、Ｉ
［ａ金属、１ｌｌａ金属、銅から構成された層状のペロ
ブスカイト型構造を有する酸化物超電導性セラミックス
線状焼結体を、
本発明の第２は、アスペクト比が３以上で長手方向の長
さが０．１μｍ以上１０００μｍ以下の■ａ金金属■ａ
属金金属銅から構成された層状のペロブスカイト型構造
を有する酸化物超電導性セラミックス粉体を、有機バイ
ンダーに混合した後シート状に成形して粉体を配向させ
、次いで前記シートを線状に巻いて焼結させることを特
徴とする酸化物超電導性セラミックス線状焼結体の製造
方法をそれぞれ内容とするものである。More specifically, the first aspect of the present invention is an I, characterized in that the C axis is oriented radially with respect to the direction in which the current flows.
[The second aspect of the present invention is to provide an oxide superconducting ceramic linear sintered body having a layered perovskite structure composed of a metal, 1lla metal, and copper, with an aspect ratio of 3 or more and a length in the longitudinal direction. 0.1 μm or more and 1000 μm or less ■a Gold metal ■a
An oxide superconducting ceramic powder having a layered perovskite structure composed of metallic copper is mixed with an organic binder and then formed into a sheet to orient the powder, and then the sheet is wound into a linear shape. Each content is a method for producing an oxide superconducting ceramic linear sintered body, which is characterized by sintering the oxide superconducting ceramic linear body.
本発明に用いられる酸化物超電導性セラミックス粉体は
、Ｉｌａ金属、銅、ＩＩＩａ＠属から構成された、臨界
転移温度が液体窒素の沸点以上、特に好ましくは９０に
以上の臨界転移温度を有する組成であることが望ましく
、具体的には次の一般式（１）に示す組成が好ましい。The oxide superconducting ceramic powder used in the present invention has a critical transition temperature of at least the boiling point of liquid nitrogen, particularly preferably at least 90, which is composed of metal Ila, copper, and group IIIa. Specifically, the composition shown in the following general formula (1) is preferable.
Ａｘ’Ｂ＋−ｘ’ｃｕｔ’ｏ＊ −−−（１）ここ
で、Ａ： Ｉ［ａ金属
Ｂ：Ｉ［Ｉａ属金金
属 ： Ｑ、 ｌ ＜ ｘ ＜ ０．９ｙ：ｏ、３＜ｙ
＜ｓ
ｚ ： ２＜２＜８
１１ａ金属としては、マグネシウム、カルシウム、スト
ロンチウム、バリウムの１種以上、そして■ａ属金金属
しては、スカンジウム、イツトリウム、ランタン系希土
類金属の１種以上の組み合わせが好ましい。Ax'B+-x'cut'o*---(1) Here, A: I[a metal B: I[Ia metal: Q, l < x < 0.9 y: o, 3 < y
<s z : 2<2<8 11a Metals include one or more of magnesium, calcium, strontium, and barium, and ■a metals include one or more combinations of scandium, yttrium, and lanthanum-based rare earth metals. is preferred.
また、この化合物は層状結晶構造を有し襞間性があるた
め、合成方法を工夫することにより、本発明にとって好
ましい、厚み方向にＣ軸が揃った鱗片状もしくは板状の
酸化物超電導性セラミックス粉体が得られる。本発明に
好ましい粉体の形状はアスペクト比が３以上で、長手方
向の長さが０゜１μｍ以上１０００μｍ以下であり、特
に好ましくはアスペクト比が５以上３０以下で、長手方
向の長さが１μｍから１００μｍのものである。この様
な粉体は通常の合成方法でも可能であるが、更に融剤と
なるアルカリまたはアルカリ土類金属のハロゲン化物を
加えて焼成し、この焼成物を融剤を溶かしながら粉砕す
ることにより、アスペクト比の大きな焼結用原料が得ら
れる。In addition, since this compound has a layered crystal structure and has interfold properties, by devising a synthesis method, it is possible to create a scale-like or plate-like oxide superconducting ceramic with the C axis aligned in the thickness direction, which is preferable for the present invention. A powder is obtained. The shape of the powder preferable for the present invention has an aspect ratio of 3 or more and a length in the longitudinal direction of 0°1 μm or more and 1000 μm or less, particularly preferably an aspect ratio of 5 or more and 30 or less and a length in the longitudinal direction of 1 μm. The diameter is 100 μm. Such a powder can be produced by ordinary synthesis methods, but by adding an alkali or alkaline earth metal halide as a flux, firing it, and pulverizing the fired product while dissolving the flux, A raw material for sintering with a large aspect ratio can be obtained.
この様にして得られたアスペクト比の高い酸化物超電導
セラミックス原料粉末を、有機バインダーを加えて混合
したのち、ロール加工やドクターブレード法などにより
機械的ストレスをかけてシート状に成形することによっ
て、原料粒子を厚み方向に対してＣ軸に配向することが
できる。The oxide superconducting ceramic raw material powder with a high aspect ratio obtained in this way is mixed with an organic binder, and then formed into a sheet by applying mechanical stress such as roll processing or a doctor blade method. The raw material particles can be oriented along the C axis with respect to the thickness direction.
有機バインダーは有機高分子単体、あるいは更に可塑剤
や溶剤で希釈した通常セラミックスの成形に用いられる
バインダー系が使用可能で特に制約はないが、大気中の
焼成で速やかに分解または燃焼して揮散することが好ま
しく、例えば有機高分子としてポリ酢酸ビニル、ポリエ
チレングリコール、ポリビニルブチラール、ポリグリコ
ール酸、ポリブテン、ポリウレタン、ポリビニルアルコ
ール、ポリエチレン、ポリプロピレン、ポリエチレン酢
酸ビニル共重合体などが挙げられる。また当然ながら、
これにフタル酸エステル等の可塑剤や潤滑剤、有機溶剤
などの成型加工上の添加剤の添加は一向に構わない。The organic binder can be a single organic polymer or a binder system that is diluted with a plasticizer or solvent and is usually used for molding ceramics, and there are no particular restrictions, but it will quickly decompose or burn and volatilize when fired in the atmosphere. Examples of organic polymers include polyvinyl acetate, polyethylene glycol, polyvinyl butyral, polyglycolic acid, polybutene, polyurethane, polyvinyl alcohol, polyethylene, polypropylene, and polyethylene-vinyl acetate copolymer. Also, of course,
Additives for molding processing such as plasticizers such as phthalate esters, lubricants, and organic solvents may be added to this.
シート状の成型加工は通常のセラミフクスの成型加工方
法により成型が可能であり、例えばドクターブレード法
、ロール加工、押出し成型法が挙げられ、特に機械的な
シェアーを強くしてなるべ（薄く成型することにより、
鱗片状酸化物超電導性粉末の配向がより向上する。Sheet-like molding can be done using normal Ceramifukus molding methods, such as the doctor blade method, roll processing, and extrusion molding. By this,
The orientation of the scaly oxide superconducting powder is further improved.
得られたシート状の成形物をそのままか、あるいは更に
リボン状に切断して必要なら線状の基体に巻き付は線状
に成型して焼結させることにより、Ｃ軸が放射状に配向
した長尺の線状焼結体が容易に得られる。この際、線状
の基体としては焼結反応時に分解揮散するものか、酸化
物超電導材料と反応しない耐熱性物質から構成されてい
るものが好ましく、例えば分解性の線状体としては、プ
ラスチックスからなる紐状の素材あるいは炭素繊維等が
あり、耐熱性の線状基体としては、セラミックスファイ
バー、金属ワイヤー等がある。また当然ながら、線状基
体は焼結反応前に除去することもできる。特にこの方法
では、内部が中空の超電導セラミックス線状焼結体も容
易に作れ、内部に液体窒素等の冷媒を流すことにより、
冷却効率を向上させることができる長所を有している。The obtained sheet-like molded product can be used as it is, or it can be further cut into ribbons and if necessary, wrapped around a linear base and then sintered to form a long length with the C-axis oriented radially. A long linear sintered body can be easily obtained. In this case, the linear substrate is preferably one that decomposes and volatilizes during the sintering reaction, or one made of a heat-resistant substance that does not react with the oxide superconducting material. For example, the degradable linear substrate is made of plastic. Examples of heat-resistant linear substrates include ceramic fibers and metal wires. Naturally, the linear substrate can also be removed before the sintering reaction. In particular, with this method, it is easy to create a superconducting ceramic linear sintered body with a hollow interior, and by flowing a coolant such as liquid nitrogen inside,
It has the advantage of improving cooling efficiency.
得られた線状の成型体を酸化性雰囲気、好ましくは大気
中あるいはこれよりも酸素濃度が高い雰囲気中で焼成す
ることにより本発明の線状の焼結体が得られる。焼成温
度は８００℃〜１２００℃、好ましくは８５０℃〜１０
００℃で、３０分以上、特に４時間以上焼成すると結晶
成長が進み、更に臨界電流値の向上が実現できる。The linear sintered body of the present invention can be obtained by firing the obtained linear molded body in an oxidizing atmosphere, preferably in the atmosphere or in an atmosphere with a higher oxygen concentration. The firing temperature is 800°C to 1200°C, preferably 850°C to 10°C.
When fired at 00° C. for 30 minutes or more, especially 4 hours or more, crystal growth progresses and the critical current value can be further improved.
「実施例」
次に、実施例を以て本発明の更に詳しい説明を行うが、
当然ながら本発明は実施例のみに限定されるものではな
い。“Examples” Next, the present invention will be explained in more detail with reference to Examples.
Naturally, the present invention is not limited to the examples.
実施例
走査電子顕微鏡による観察で、アスペクト比が約８で長
手方向の長さが約７μｍのインドリウム、バリウム、銅
の金属組成比が１：２：３からなる層状ペロブスカイト
型酸化物超電導性粉末にポリ酢酸ビニル溶液を加え攪拌
してペースト状にしたのち、テフロンフィルム上にバー
コーターを用いてコーテイング後乾燥して厚さ約２００
μｍのフィルムを得た。Example A layered perovskite-type oxide superconducting powder with an aspect ratio of about 8 and a length in the longitudinal direction of about 7 μm and a metal composition ratio of indium, barium, and copper of 1:2:3 when observed using a scanning electron microscope. After adding polyvinyl acetate solution and stirring to make a paste, it was coated on a Teflon film using a bar coater and dried to a thickness of about 200mm.
A μm film was obtained.
次に、このフィルムを幅ＩＱｍにカットしてテープ状に
した後、直径１■のポリプロピレン製のワイヤーに約５
鶴のピッチで３層巻きつけた後、ポリプロピレン製のワ
イヤーを抜取り、線状の成型体を作り、そしてこの成型
体を酸化雰囲気で９５０℃５時間焼成して、直径約１ｆ
ｉで長さが約２０ｃｍの中空な線状の焼結体を得た。Next, this film was cut into a tape shape with a width of IQm, and then attached to a polypropylene wire with a diameter of 1 cm.
After wrapping three layers with crane pitch, the polypropylene wire was pulled out to make a linear molded body, and this molded body was fired at 950°C for 5 hours in an oxidizing atmosphere to create a diameter of approximately 1 f.
A hollow linear sintered body with a length of about 20 cm was obtained.
この線状焼結体を長さ５ｃｍに切出して両端及び中間部
分の４ケ所に銀電極を取り付け、直流四端子法により導
電性の温度変化を測定したところ、９７にで抵抗の急激
な低下が始まり９２にで測定器の検出限界を超える低い
電気抵抗となり、超電導状態に達したものと判断した。This linear sintered body was cut into a length of 5 cm, silver electrodes were attached to both ends and the middle part, and the temperature change in conductivity was measured using the DC four-terminal method. At the beginning of 92, the electrical resistance became low, exceeding the detection limit of the measuring device, and it was judged that a superconducting state had been reached.
また液状窒素中（７７Ｋ）試料を入れ、臨界電流値を測
定したところ、４．５Ａで超電導状態が壊れ、臨界電流
値で約５９０ Ａ／ｃｄであった。Further, when a sample was placed in liquid nitrogen (77K) and the critical current value was measured, the superconducting state was broken at 4.5 A, and the critical current value was approximately 590 A/cd.
また、同一組成で、アスペクト比が３未満の常法による
酸化物超電導性粉末を用いて同様な方法にて線状の焼結
体を作り、同じく液体窒素中の臨界雷流値を測定したと
ころ、約８０Ａ／ａｄであった。In addition, a linear sintered body was made using a conventional method using oxide superconducting powder with the same composition and an aspect ratio of less than 3, and the critical lightning current value in liquid nitrogen was also measured. , about 80 A/ad.
「作用・効果」
叙上のように、本発明の酸化物超電導性セラミックス線
状焼結体は臨界電流値が向上する。"Action/Effect" As described above, the oxide superconducting ceramic linear sintered body of the present invention has an improved critical current value.
Claims (1)
いることを特徴とする、IIａ金属、IIIａ金属、銅から
構成された層状のペロブスカイト型構造を有する酸化物
超電導性セラミックス線状焼結体。 ２、アスペクト比が３以上で長手方向の長さが０．１μ
ｍ以上１０００μｍ以下のIIａ金属、IIIａ属金属、銅
から構成された層状のペロブスカイト型構造を有する酸
化物超電導性セラミックス粉体を、有機バインダーに混
合した後シート状に成形して粉体を配向させ、次いで前
記シートを線状に巻いて焼結させることを特徴とする酸
化物超電導性セラミックス線状焼結体の製造方法。[Claims] 1. An oxide having a layered perovskite structure composed of IIa metal, IIIa metal, and copper, characterized in that the C-axis is oriented radially with respect to the direction of current flow. Superconducting ceramic linear sintered body. 2. Aspect ratio is 3 or more and longitudinal length is 0.1μ
An oxide superconducting ceramic powder having a layered perovskite structure composed of IIa metal, IIIa group metal, and copper with a diameter of 1000 μm or more is mixed with an organic binder and then formed into a sheet to orient the powder. 1. A method for producing an oxide superconducting ceramic linear sintered body, the method comprising: then winding the sheet into a linear shape and sintering it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62112721A JPS63277554A (en) | 1987-05-08 | 1987-05-08 | Oxide superconductive ceramic linear sintered material and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62112721A JPS63277554A (en) | 1987-05-08 | 1987-05-08 | Oxide superconductive ceramic linear sintered material and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63277554A true JPS63277554A (en) | 1988-11-15 |
Family
ID=14593863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62112721A Pending JPS63277554A (en) | 1987-05-08 | 1987-05-08 | Oxide superconductive ceramic linear sintered material and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63277554A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6454611A (en) * | 1987-08-24 | 1989-03-02 | Mitsubishi Electric Corp | Superconductive wire |
| JPH04104409A (en) * | 1990-08-22 | 1992-04-06 | Hitachi Ltd | Oxide superconductor, manufacture thereof, and superconducting coil |
| JP2008130938A (en) * | 2006-11-22 | 2008-06-05 | Idemitsu Kosan Co Ltd | Conductive molding, electronic component, electric device, electrical characteristics recognition device and method |
-
1987
- 1987-05-08 JP JP62112721A patent/JPS63277554A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6454611A (en) * | 1987-08-24 | 1989-03-02 | Mitsubishi Electric Corp | Superconductive wire |
| JPH04104409A (en) * | 1990-08-22 | 1992-04-06 | Hitachi Ltd | Oxide superconductor, manufacture thereof, and superconducting coil |
| US5798312A (en) * | 1990-08-22 | 1998-08-25 | Hitachi, Ltd. | Elongate superconductor elements comprising oxide superconductors, superconducting coils and methods of making such elements |
| JP2008130938A (en) * | 2006-11-22 | 2008-06-05 | Idemitsu Kosan Co Ltd | Conductive molding, electronic component, electric device, electrical characteristics recognition device and method |
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