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ABSTRACT: Progress has been made in the development of long 2233 phase multifilamentary wire tapes using the powder-in-tube technique. Ramless extrusion was successfully used to deform multifilamentary precursor/Ag-composites of large diameter. After extrusion and wire drawing the mean variation coefficient of filament cross sections along the wire length was determined to be about 10%. Studies of 2223 phase formation in the wire cores have shown, that the conversion of the precursor to 2223 has been accelerated by annealing under reduced O<sub>2</sub> pressure compared with air. Critical current densities of 12 kA/cm<sup>2</sup> and about 5 kA/cm<sup>2</sup> (77 K; 0 T) were achieved for the 19 filament wire tapes of 17 m and 100 m length, respectively. J<sub>c</sub> of tapes of 0.12 mm thickness has been suppressed around a strain value of 0.1%.
IEEE Transactions on Appiled Superconductivity 07/1995; · 1.04 Impact Factor
