The influence of process variables of precursor powders on the micro structure evolution and transport current properties of Bi-2223/Ag tapes

摘要

The effect of Pb content and particle size of precursor powders has been studied to improve the grain growth and texture of Bi-2223/Ag tapes. The Pb content and particle size of precursor powders dominate the amount of liquid phases, and thus affect the value of J_c with a variation of heat treatment condition. The best values of J_c reached 53 kA/ cm- at 77 K and 0 T, after 210 h heat treatment at 839°C and two times intermediate pressing. It suggests that the improvement of J_c characterized from high fraction of Bi-2223 with enlarged crystallites is attainable by optimizing the processing variables of precursor powders.