Effect of intermediate layer densification on critical current of Bi-2223 superconducting joint


 The effect of intermediate layer densification on the critical current (I
 c) of Bi-2223 superconducting joints was quantitatively studied. First, we evaluated the phase purity, density, and intergrain critical current density (J
 c) of Bi-2223 thick film samples simulating the intermediate layer. The samples were uniaxially pressed to increase the film density. After two heat treatments of the pressed film, an increase in J
 c was achieved. Second, we fabricated superconducting joints by synthesizing an intermediate layer between two Bi-2223 tapes. Applying a uniform uniaxial pressure on the joint resulted in the formation of a homogenous structure. This process enables the reproducible fabrication of superconducting joints with high n values. The I
 c of the superconducting joint was increased by intermediate pressing and two heat treatments. However, pressing at high pressures can mechanically damage filaments in the Bi-2223 tapes, leading to a decrease in I
 c. Sample characterization showed that the optimum intermediate pressing pressure range to produce high I
 c was 1.5–2 × 108 Pa. We confirmed that pressing densified the intermediate layer of the superconducting joints. Our experimental results and analyses reveal that densification of the intermediate layer increases the I
 c of Bi-2223 superconducting joints.