Researches on the Optimization of Cold Pressing of Ag-clad Bi-2223 Superconducting Tapes

Optimum researches of cold pressing of Ag-clad Bi-2223 superconducting tapes fabricated by Powder-in-tube method were carried out. Cold pressing was necessary to produce tapes with good texture and high J_c values. The optimum technical parameters are sintering three times at 838℃ for 60h and pressing twice with pressure 2.0GPa and 2.5GPa for the first and second compaction respectively. Reduction rate of cold pressing is 1.5×10^-4mm/s. Meanwhile, experimental results exhibited that high density and degree of grain alignment of the tapes are mainly attributed to cold perssing.