Srinivas Tirumala et al 1997 Supercond. Sci. Technol. 10 686 doi:10.1088/0953-2048/10/9/009
Thermomechanical processing and reaction kinetics of Bi-2223 powder-in-tube tapes made from aerosol precursor
Srinivas Tirumala
, Dominic F Lee
, Donald M Kroeger and Kamel Salama
Currently, powder-in-tube Bi-2223 superconductor is the most promising candidate for fabricating long-length conductors. Intensive investigations have shown that the critical current density of fully processed tapes is affected by a large variety of processing parameters. Among these are the thermomechanical processing schedule and the extent of Bi-2223 phase conversion. In this study, a powder precursor was prepared using an aerosol pyrolysis technique, which has been shown to have the advantage of reduced processing time. Powder-in-tube conductors were fabricated using the aerosol precursor powder, and the thermomechanical processing steps were varied. Different schedules were correlated with the amount of Bi-2223 phase as well as the critical current density. The number of pressings and the length of sintering time between pressings were found to be closely related to the critical current density at various stages of the thermomechanical treatment.
- PACS
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84.71.Mn Superconducting wires, fibers, and tapes
74.81.Bd Granular, melt-textured, amorphous and composite superconductors
- Subjects
- Dates
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Issue 9 (September 1997)
Received 25 February 1997, in final form 7 May 1997
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Thermomechanical processing and reaction kinetics of Bi-2223 powder-in-tube tapes made from aerosol precursor
Srinivas Tirumala et al 1997 Supercond. Sci. Technol. 10 686
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