Current transport and microstructural evolution in BSCCO tapes fabricated by groove rolling.

Conference · Wed Jan 27 04:00:00 EST 1999

OSTI ID:12376

Balachandran, U; Iyer, A N; Mironova, M; Salama, K; Stolbov, S; Vipulanandan, C

The powder-in-tube technique, consisting of wire drawing and rolling, has been widely used to fabricate superconducting tapes for possible electric power applications. In this study, instead of wire drawing, the starting billet was reduced in size by groove rolling. To optimize the deformation and thermomechanical treatment process, wires of varying dimensions were fabricated. The wires were flat-rolled to a final thickness of 250 mm. Short-length tapes were subjected to a series of thermal and deformation steps. Phase development and microstructural evolution during the process were monitored by XRD, SEM, and TEM. The BSCCO-2223 tapes, which were subjected to thermomechanical treatment, had average critical current densities of 18,000 A cm{sup {minus}2}. Colony boundaries, examined by TEM, near the superconductor-silver interface were found to form in certain preferred orientations. Polytypoids of 2212 phase were also observed at the colony boundary. The effects of grain boundary on superconducting order parameter and critical current density have also been examined.

• Research Organization: Argonne National Lab., IL (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 12376
• Report Number(s): ANL/ET/CP-98288
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
GRAIN ORIENTATION
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
ORDER PARAMETERS
ROLLING
STRONTIUM OXIDES
SUPERCONDUCTING WIRES
THERMOMECHANICAL TREATMENTS