Variance of Critical Current Density with Microstructure by a Special Process

A promising method —“powder in tube”technique was used to fabricate Ag-sheathed Bi-2223superconductive tapes with high critical current density.After a combination processing of pressingand subsequent heat treatment,we obtained tapes with high degree of texture,good compactionand uniform properties.At 77 K in zero field,J_C was higher than 1×10~4 A/cm~2 while the highestJ_C was 1.69×10~4 A/cm~2.SEM and XRD was used to detect the tapes texture,and the relationship be-tween J_C and the degree of texture is discussed.In addition,the reason for obstacling the improvementof J_C is also investigated.

Variance of Critical Current Density with Microstructure by a Special Process

A promising method —“powder in tube”technique was used to fabricate Ag-sheathed Bi-2223 superconductive tapes with high critical current density.After a combination processing of pressing and subsequent heat treatment,we obtained tapes with high degree of texture,good compaction and uniform properties.At 77 K in zero field,J_C was higher than 1×10~4 A/cm~2 while the highest J_C was 1.69×10~4 A/cm~2.SEM and XRD was used to detect the tapes texture,and the relationship be- tween J_C and the degree of texture is discussed.In addition,the reason for obstacling the improvement of J_C is also investigated.