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-μm-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 10000 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-μm-thick Ni-Cr tapes are currently developed.