Drastic Improvement in Mechanical Properties of DI-BSCCO Wire With Novel Lamination Material

Ni–Cr alloys have been focused on as a new promising material for the reinforcement of DI-BSCCO wire. In addition to Ni–Cr alloy lamination, the thinner Type H wire and pretension have been employed. The fabricated Type H wires laminated with 35- $\mu\text{m} $ -thick Ni–Cr alloys have shown no degradation in $I_c$ properties and surpassed all the Type HT wires laminated with the thicker stainless-steel tapes in the tensile strength and double bending diameter. It was demonstrated that the wire could tolerate the practical extent of tensile load up to 10 000 cycles. The in-field $I_c$ performance has hardly been compromised with the moderate pretension. These results, along with the smaller cross-sectional size, have led to the compatibility between high $J_e$ and high mechanical strength. The Type HT wire with the thinner Type H wire and 30- $\mu\text{m}$ -thick Ni–Cr tapes are currently developed.