The Effect of Hot Isostatic Pressure on the Microstructure and Critical Current of Bi-2223/Ag Superconducting Tapes

Hot isostatic pressure (HIP) process has been carried out on multifilament Bi-2223/Ag tapes. The influence of the crack-healing process (CHP) on the microstructure and critical current (
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) of HIP samples has been studied.
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values of HIP samples show a strong depend on the CHP sintering temperature and dwelling time, with the optimum CHP condition at about 828
^deg
C for 3 hours. It was suggested that CHP is related to the presence of liquid phase, leading to a self-sealed effect in Bi-2223/Ag tapes. By controlling the CHP temperature, a preliminary
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improvement of about 14% has been achieved on HIP samples, compared to those sintered at normal pressure.