As an alternative to the powder-in-tube method, a new technique called the jelly-roll process is proposed for making high-T[sub c] superconducting tapes and wires. A normal-metal sheet coated with high-T[sub c] cuprate is configured in a jelly-roll fashion and cold worked into tapes or wires made of alternating cuprate superconductor and normal metal layers. The feasibility of this new process is demonstrated for both the YBa[sub 2]Cu[sub 3]O[sub 7]/Ag and Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8]/Ag composite systems. The role of reduction in the cross-sectional area by cold-rolling, heat treatment and oxygenation in optimizing T[sub c] and J[sub c] has been studied. Preliminary results indicate that partialmelt texturing, in the Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8]/Ag system, results in a relatively field independent J[sub c] (H< or approx.7T) with J[sub c](H = 0) [proportional to]5 X 10[sup 4] A cm[sup -2] at 4.2 K.
Tsuei, C C; Chi, C C; Frey, T; Mitzi, D B; Kazyaka, T;  Haugan, T; Ye, J; Patel, S; Shaw, D T;  Wu, M K 
- IBM Thomas J. Watson Research Center, Yorktown Heights, NY (United States)
- New York State Inst. on Superconductivity, SUNY, Buffalo, Amherst, NY (United States)
- Dept. of Physics, National Tsing Hua Univ., Hsinchu (Taiwan)