Hot rolling of powder-in-tube Li-doped Bi(2212) tapes

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.305683· OSTI ID:33477

Guo, J; Schwartz, J ^[1]; Wu, C T; Goretta, K C ^[2]

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1. Univ. of Illinois, Urbana, IL (United States). Dept. of Nuclear Engineering
2. Argonne National Lab., IL (United States). Energy Technology Div.

Power-in-tube Li-doped Bi (2212) tapes with high critical currents have been obtained by a hot rolling process. Hot rolling was accomplished in the final rolling stage after partial melting by preheating the rolls with infrared heaters to various temperatures ranging from 300 to 410 C and then rolling the tapes directly from a 750 C furnace. {Tc} decreased after hot rolling and final heat treatment. Microstructural analysis shows improved grain alignment with increased hot-rolling temperature. Due to the small thermal capacities of these Ag-clad BSCCO tapes, as well as the different in temperature between the rolls and the furnace, the remnant liquid phase that formed from partial melting was melted during the 750 C preheat and subsequently formed a glassy phase upon contact with the heated rolls. The amount of glassy phase was reduced with increasing roll temperature. Results show that the enhancement of J{sub c} was due to an improvement of grain alignment and reduction in amount of secondary phases.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 33477
• Report Number(s): CONF-930926--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 4Pt2 Vol. 30; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
DOPED MATERIALS
EXPERIMENTAL DATA
FABRICATION
HOT WORKING
LITHIUM
MICROSTRUCTURE
SILVER
STRONTIUM OXIDES
SUPERCONDUCTING COMPOSITES
TRANSITION TEMPERATURE