JPS63277555A - Oxide superconductive ceramic sintered material and production thereof - Google Patents
Oxide superconductive ceramic sintered material and production thereofInfo
- Publication number
- JPS63277555A JPS63277555A JP62112722A JP11272287A JPS63277555A JP S63277555 A JPS63277555 A JP S63277555A JP 62112722 A JP62112722 A JP 62112722A JP 11272287 A JP11272287 A JP 11272287A JP S63277555 A JPS63277555 A JP S63277555A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- powder
- sintered material
- copper
- axis
- 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 23
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 title abstract 5
- 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 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 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
- 238000009835 boiling Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 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
- 229910052758 niobium Inorganic materials 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
- 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
- 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
- 239000004743 Polypropylene Substances 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
- 238000002441 X-ray diffraction Methods 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
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007606 doctor blade 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
- 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
- 238000010030 laminating Methods 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
- 238000005259 measurement Methods 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
- 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
- -1 polyethylene 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
- 238000005096 rolling process Methods 0.000 description 1
- 239000000523 sample Substances 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
- 238000005728 strengthening 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
- 238000010345 tape casting Methods 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
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Ｉｌａ金属、銅、ｍａ
属金金属ら構成された、ペロブスカイト型金属酸化物超
電導性セラミックス焼結体及びその製造法に関するもの
で、特に大きな臨界電流値が得られるように電流を流す
方向に対してＣ軸が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 Application Field" The present invention is applicable to Ila metal, copper, ma
This relates to a perovskite-type metal oxide superconducting ceramic sintered body composed of metallic metals and its manufacturing method, in which the C-axis is oriented 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」
ＩＩａ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超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Ｎｂ、Ｇｅ（２３，２Ｋ）を
大幅に超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 superconducting ceramics composed of IIa metal copper and IIIa group metals have significantly higher critical transition temperatures than Nb and Ge (23.2K), which were the highest to date. Since the discovery of a high critical transition temperature, it has attracted attention in various fields.
特に、この組成においてｍａ属金金属してイツトリウム
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２０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、
エネルギー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 ma group metals with this composition have been obtained with critical transition temperatures exceeding the boiling point of liquid nitrogen (77.3K), and are considered rare resources as coolants. Moreover, liquid nitrogen, which is cheaper and has better cooling efficiency, can be used instead of liquid helium, which is about 20 times more expensive, so it can be used for semiconductor devices, superconducting magnets,
Significant expansion of applications such as energy storage can be expected.
しかし、この酸化物超電導性セラミックスは高いＲ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Ｎｂ２ Ｇｅ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 R-field transition temperature and a high critical magnetic field, it can only obtain an extremely small critical current compared to conventional Nb2Ge, Nb, and Sn. This drawback is a major obstacle to practical use.
この酸化物超電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、ａＳＳ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
軸方向に超電導性がある。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、超電導性
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 superconducting ceramic is a perovskite-type compound with a layered structure, and the aSS property is said to occur due to the connected parts of the copper-oxygen octahedral structure. There is anisotropy, a, b
Superconducting in the axial direction. For this reason, in polycrystalline bodies obtained by normal ceramic sintering methods, the crystal axes of superconductivity are not aligned, resulting in a low critical current value.In order to obtain an even higher critical current value, it is necessary to It is necessary to create a uniform polycrystalline body and to flow current in the a- and b-axis directions where superconductivity can be obtained.
本発明者らはこのＩｌａ金属、銅、ｍａ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存
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
性粉末に存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た後、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 have been conducting studies to improve the critical current value of perovskite-type metal oxide superconducting ceramics composed of Ila metal, copper, and Ma group metal. It has been found 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. It has been discovered that a sintered body with a significantly improved critical current value can be obtained by adding a binder to oxide superconducting powder, applying mechanical stress, forming it into a sheet, and then sintering it, and has developed the present invention. reached.
「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 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
て直角にＣ軸が配向されていることを特徴とする、Ｉｌ
ａ金属、ＩＩＩａ金属、銅から構成された層状のペロブ
スカイト型構造を存する酸化物超電導性セラミックス焼
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ｍａ
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、を機バイ
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ｌを積層し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 that the C-axis is oriented at right angles to the direction of current flow.
The second aspect of the present invention is an oxide superconducting ceramic sintered body having a layered perovskite structure composed of a metal, IIIa metal, and copper, and having an aspect ratio of 3 or more and a longitudinal length of 0.1 μm. ■a Gold metal ma of not less than 1000μm
An oxide superconducting ceramic powder having a layered perovskite structure composed of a metallic metal and copper is mixed with a mechanical binder, and then formed into a sheet to orient the powder, and then the above seal is laminated. Each content is a method for manufacturing an oxide superconducting ceramic sintered body, which is characterized by sintering the oxide superconducting ceramic body.
本発明に用いられる酸化物超を導性セラミックス粉体は
、ＩＩａ金属、銅、ｍａ金金属ら構成された、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 is composed of IIa metal, copper, and MA gold metal, and has a critical transition temperature of at least the boiling point of liquid nitrogen, particularly preferably at least 90. Specifically, the composition shown in the following general formula (1) is preferable.
ＡＭ ’ Ｂｌ−Ｘ ’ Ｃｕｙ ” Ｏｓ
” ’ （Ｈここで、Ａ：ＩＩａ金属
Ｂ：ｍａ属金属
ｘ：Ｑ、ｌ＜ｘ＜０．９
ｙ：Ｑ、３＜ｙ＜５
ｚ ： ２＜ｚ＜Ｂ
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■ａｌ；Ｉｉ
ｉ金属としては、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。AM'Bl-X' Cuy” Os
"' (H Here, A: IIa metal B: ma group metal x: Q, l<x<0.9 y: Q, 3<y<5 z: 2<z<B 11a Metals include magnesium, One or more of calcium, strontium, and barium, and ■al;Ii
The i-metal is preferably a combination of one or more of scandium, yttrium, and lanthanum-based rare earth metals.
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０６１μｍ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 061 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 to 100 μm. belongs to. 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、有機パインダ−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。更に、このシートを積層するかテープ状の形体
にし焼成することによって、臨界電流値の向上したブロ
ック状またはリボン状の焼結体が得られる。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 by rolling or doctor blading. , raw material particles can be oriented along the C-axis with respect to the thickness direction. Furthermore, by laminating these sheets or forming them into a tape-like shape and firing them, a block-like or ribbon-like sintered body with an improved critical current value can be obtained.
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ックスの成型加工方
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く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 performed using normal ceramic molding methods, such as the doctor blade method, roll processing, and extrusion molding methods.In particular, by strengthening the mechanical shear and molding as thin as possible. ,
The orientation of the scaly oxide superconducting powder is further improved.
得られた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
により本発明の焼結体が得られる。The sintered body of the present invention can be obtained by firing the obtained molded body in an oxidizing atmosphere, preferably in the atmosphere or in an atmosphere with a higher oxygen concentration.
焼成温度は８００℃〜１２００℃、好ましくは８５０℃
〜１０００℃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
。Firing temperature is 800℃~1200℃, preferably 850℃
Firing at ~1000° C. for 30 minutes or more, particularly 4 hours or more, promotes crystal growth and further improves the critical current value.
「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のイツトリウム、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 Observation using a scanning electron microscope revealed that a layered perovskite-type oxide superconducting powder with an aspect ratio of about 8 and a longitudinal length of about 7 μm and a metal composition ratio of yttrium, barium, and copper of 1:2:3 was obtained. Add polyvinyl acetate solution and stir to make a paste, then coat it on a Teflon film using a bar coater and dry to a thickness of about 200mm.
A μm film was obtained.
次に、このフィルムを１０枚積層してプレス成形した後
、酸化雰囲気で９５０℃５時間焼成して、厚さ約１．３
ｆｌの板状焼結体を得た。Ｘ線回折による分析の結果、
この焼結体は原料粉末に比べて厚み方向にＣ軸が強く配
向していることが分かった。Next, 10 of these films were laminated and press-molded, and then baked at 950°C for 5 hours in an oxidizing atmosphere to a thickness of about 1.3 cm.
A plate-shaped sintered body of fl was obtained. As a result of analysis by X-ray diffraction,
It was found that the C-axis of this sintered body was more strongly oriented in the thickness direction than that of the raw material powder.
この焼結体上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、９６にで抵抗の急
激な低下が始まり９３．５ Ｋ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。When a silver electrode was attached to this sintered body and temperature changes in conductivity were measured using the DC four-probe method, the resistance began to drop rapidly at 96 K and a low electrical current exceeding the detection limit of the measuring device was detected at 93.5 K. It became a resistance and was judged to have reached a superconducting state.
また、測定中に電流値を変えてみたが、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
用いて同様な方法で得た焼結体に比較して、超電導の転
移温度の変化量は１／３近く小さかった。このことは明
らかには界電流値が向上したことを示している。In addition, although we tried changing the current value during the measurement, we found that the superconductivity of The amount of change in transition temperature was nearly 1/3 smaller. This clearly shows that the field current value has improved.
「作用・効果」
畝上のように、本発明の酸化物超電導性セラミックス焼
結体は臨界電流値が向上する。"Action/Effect" As shown in the ridges, the oxide superconducting ceramic sintered body of the present invention has an improved critical current value.
Claims (1)
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 at right angles to the direction of current flow. Superconducting ceramic 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. . A method for producing an oxide superconducting ceramic sintered body, the method comprising: then sintering the sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62112722A JPS63277555A (en) | 1987-05-08 | 1987-05-08 | Oxide superconductive ceramic sintered material and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62112722A JPS63277555A (en) | 1987-05-08 | 1987-05-08 | Oxide superconductive ceramic sintered material and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63277555A true JPS63277555A (en) | 1988-11-15 |
Family
ID=14593890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62112722A Pending JPS63277555A (en) | 1987-05-08 | 1987-05-08 | Oxide superconductive ceramic sintered material and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63277555A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63285159A (en) * | 1987-05-19 | 1988-11-22 | Matsushita Electric Ind Co Ltd | Production of superconductor of oxide |
| JPS6479011A (en) * | 1987-09-21 | 1989-03-24 | Furukawa Electric Co Ltd | Flaky oxide superconductor and production thereof |
| JPH01100021A (en) * | 1987-05-31 | 1989-04-18 | Sumitomo Electric Ind Ltd | Superconducting thin film |
| JPH01108144A (en) * | 1987-10-19 | 1989-04-25 | Seiko Epson Corp | Superconducting material |
| JPH01275426A (en) * | 1988-04-27 | 1989-11-06 | Kyocera Corp | Oxide superconductor and production thereof |
| JPH035358A (en) * | 1989-05-30 | 1991-01-11 | Nippon Cement Co Ltd | Production of orientable oxide superconductor |
-
1987
- 1987-05-08 JP JP62112722A patent/JPS63277555A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63285159A (en) * | 1987-05-19 | 1988-11-22 | Matsushita Electric Ind Co Ltd | Production of superconductor of oxide |
| JPH01100021A (en) * | 1987-05-31 | 1989-04-18 | Sumitomo Electric Ind Ltd | Superconducting thin film |
| JPS6479011A (en) * | 1987-09-21 | 1989-03-24 | Furukawa Electric Co Ltd | Flaky oxide superconductor and production thereof |
| JPH01108144A (en) * | 1987-10-19 | 1989-04-25 | Seiko Epson Corp | Superconducting material |
| JPH01275426A (en) * | 1988-04-27 | 1989-11-06 | Kyocera Corp | Oxide superconductor and production thereof |
| JPH035358A (en) * | 1989-05-30 | 1991-01-11 | Nippon Cement Co Ltd | Production of orientable oxide superconductor |
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