Bending strain tolerance in BPSCCO-2223 tapes

M.T. MALACHEVSKY; D.A. ESPARZA; C.D'OVIDIO

CZECHOSLOVAK JOURNAL OF PHYSICS

Plenum

Año: 1996 vol. 46 p. 1697 - 1698

0011-4626

The degradation of critical current density (Jc) at 77 K in superconducting tapes was evaluated for combined tension-compression strain. Tapes were prepared by pressing or rolling BPSCCO-2223 Ag-sheathed wires. Lengths of approximately 8 cm were bended by wounding on cylinders of different diameters (between 15 to 0.8 cm) at room temperature. The Jc at 77 K was measured either after letting the tape to relax or with the applied strain. The bending strain was calculated as the ratio between the total thickness of the tape (silver sheath plus ceramic core) and the curvature diameter. The strain tolerance for each case was obtained from the deformation Vs Jc characteristics. We present the analysis of the results along with the microstructure, thickness, preparation procedure of the tapes and the degradation of Jc with thermal cycling.