Oxide superconductor thick film and method for manufacturing the same

Abstract

The present invention provides a Bi2223 based thick film that does not peel off when a thermal or a mechanical shock is applied to a base or an oxide superconductor thick film or the like in the middle of a manufacturing process and a method of manufacturing the same An oxide superconductor paste 1 having a mixing ratio of Bi2212 composition is applied to a base 3 , dried, burned, and thereafter burned at a temperature approximate to its melting point to obtain a partially molten layer 4 . Next, an oxide superconductor paste 2 having a mixing ratio of Bi2223 composition is applied to the partially molten layer 4 , dried, burned, compressed by a CIP, and thereafter repeatedly burned and compressed for a predetermined number of times to obtain the base 3 having a desired superconductor thick film 5 formed thereon.

What is claimed is:  
     
         1 . An oxide superconductor thick film containing Bi, Pb, Sr, Ca, and Cu and substantially having a composition of (Bi, Pb) 2+a Sr 2 Ca 2 Cu 3 O z  (Note: 0<a<0.5) to be formed on a surface of a substrate or a base, wherein 
 no fracture surface exists in the vicinity of an interface between said substrate or said base and said oxide superconductor thick film in said oxide superconductor thick film.    
     
     
         2 . A method for manufacturing an oxide superconductor thick film in such a manner that an oxide superconductor thick film containing Bi, Pb, Sr, Ca and Cu is formed on a surface of a substrate or a base, comprising, 
 forming a first thick film substantially having a composition of Bi 2 Sr 2 Ca 1 Cu 2 O z  on the surface of said substrate or said base, and thereafter, forming an oxide superconductor thick film substantially having a composition of (Bi, Pb) 2+a Sr 2 Ca 2 Cu 3 O z  (Note: 0<a<0.5) on said first thick film.