Abstract
The effect of post-annealing on critical current density of (Bi,Pb)-2223/Ag tapes has been investigated. The fully reacted (Bi,Pb)-2223/Ag multifilament tapes were post-annealed in different processing parameters, including post-annealing temperature, dwelling time and oxygen partial pressure. Experimental results show that post-annealing at low temperature in reduced oxygen partial pressure can improve the critical current density. With decreasing oxygen partial pressure, the optimal temperature range of post-annealing shifts to lower temperature. The effect of post-annealing could be related to the increase of (Bi,Pb)-2223 phase and the formation of Pb 3Sr 2.5Bi 0.5Ca 2CuO y (3321 phase) as well as the improvement of gain connectivity.
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