Advances in Fabrication of Mono- and Multifilament Ag-Clad BSCCO Superconductors
Fabricating long lengths of robust and high-quality conductors is imperative for various applications of high-Tc superconductors. Long lengths of mono- and multifilament Ag-clad Bi-Sr-Ca-Cu-O conductors have been fabricated by the powder-in-tube technique. High values for critical current density (Jc) have been achieved in both short- and long-length conductors. Jc values up to 12,000 A/cm2 have been achieved in an 850-m-long multifilament conductor. Pancake-shaped coils and test magnets fabricated from long-length conductors were characterized at various temperatures and applied magnetic fields. A magnet containing 770 m of high-Tc conductor generated a record high field of ≈ 1 T at 4.2 K in a background field of ≈20 T. In-situ tensile and bending characteristics of both mono- and multifilament conductors have also been studied. Multifilament conductors exhibited better axial strain tolerance (ε ≈1%) than that of monofilament conductor (ε ≈0.2%), while retaining 90% of their initial critical current. An analysis of the results is presented, along with effects of parameters such as thickness, superconductor/Ag ratio, and microstructural details.
KeywordsCritical Current Density Background Field Strain Tolerance Test Magnet Pancake Coil
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- 10.P. Haldar, J. G. Hoehn, Jr., L. R. Motowidlo, U. Balachandran and Y. Iwasa, Adv. Cryo. Eng. 40:313 (1994).Google Scholar
- 15.J. Ekin, Materials at Low Temperatures, eds. Reed and Clark, Materials Park, OH: American Society for Metals (1983).Google Scholar
- 19.J. Yau, H. K. Liu, Q. Y. Hu, N. Savvides and S. X. Dou, J. Mater. Syn. Proc. 2:45 (1994).Google Scholar