Ad. Nikulin et al., THE EFFECT OF DEFORMATION REGIMES ON SUPERCONDUCTING PROPERTIES AND MICROSTRUCTURE OF BI-2223 TAPES, IEEE transactions on applied superconductivity, 7(2), 1997, pp. 2094-2097
The rolling process of Bi-2223 tape conductors was optimized trough th
e regressive analysis of experimental data. This procedure ensures the
effective densification of the powder precursor in the core and homog
eneous distribution of powder density in conductor cross section, thus
shortening the rolling process. The Jc values were realized for the m
onofilament and 19-filament conductors processed by ''powder in tube''
method with one step intermediate rolling such as 3.1 x 10(4) A/cm(2)
(77 K, OT) and 2,6 x 10(4) A/cm(2) (77 K, OT) respectively. Character
istics of single pancake coils are presented fabricated from 19-filame
nt conductor: no Jc degradation was observed after 10 steps of thermoc
ycling in the range between 77 and 293 K.