PRODUCTION OF SCALY BI-BASED SUPERCONDUCTING OXIDE POWDER HAVING UNIFORM DIRECTIONAL PROPERTY

PURPOSE:To obtain the title powder providing a Bi-based superconducting substance having high critical current density by heating amorphous powder of Bi-Sr-Ca-Cu-O-based oxide having specific average particle diameter and grinding. CONSTITUTION:Bi2O3 powder, SrCO3 powder, CaCO3 powder and CuO powder...

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Hauptverfasser:	TAKESHITA TAKUO, SUGIHARA TADASHI, OUCHI YUKIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR BASIC ELECTRIC ELEMENTS CABLES CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CONDUCTORS CRYSTAL GROWTH ELECTRICITY INORGANIC CHEMISTRY INSULATORS METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the title powder providing a Bi-based superconducting substance having high critical current density by heating amorphous powder of Bi-Sr-Ca-Cu-O-based oxide having specific average particle diameter and grinding. CONSTITUTION:Bi2O3 powder, SrCO3 powder, CaCO3 powder and CuO powder having >=about 10mum average particle diameter are blended in a ratio to give a superconductor. Then the blended powder is heat, melted, the melt is jetted toward between twin rolls which are being cooled and quenched to give an amorphous sheet of Bi-Sr-Ca-Cu-O-based oxide, which is ground by a method of grinding by a ball mill to produce amorphous powder of Bi-Sr-Ca-Cu-O-based oxide having 1-10mum average particle diameter. Then the powder is heat-treated and ground to give scaly Bi-based superconducting oxide powder having uniform directional property of crystal.