Abstract
PAIR process, which is the combination of pre-annealing (PA) and intermediate rolling (IR) processes and is performed prior to melt-solidification, enhances J c of the Bi-2212/Ag composite tapes. The effects of pre-annealing and intermediate rolling process on microstructure and J c of the Bi-2212/Ag multilayer tapes fabricated by the oxide-painting method have been studied. The results show that J c has been increased strongly by performing pre-annealing at 800–880°C and intermediate rolling with >25% deformation. Transport J c of 3.3×10 5 A/cm 2 in magnetic field (4.2 K, 10 T) is obtained. The enhancement of J c is assigned to the microstructure with high grain alignment and uniformity, as well as the improvement of grain coupling by the PAIR process.
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