Abstract
The evolution of Bi-2223 phase and liquid phase (LP) during the initial sintering stage in a mono-filament Bi-2223/Ag tape was studied in quenched samples by using SEM. Samples were sintered at 840 °C in 8.0% O 2 atmosphere and quenched in air after different dwelling time ( t d = 1 – 50 h ). It was found that the growth of Bi-2223 grains from the precursor powder could be explained by a pseudo-peritectic procedure: LP + Bi-2212 ⇒ Bi-2223 + secondary phases. Bi-2223 grains appeared after 3 h sintering. They grew along the interface between LP and Bi-2212 grains at first, which could be a fast peritectic reaction process controlled by short range diffusion. When t d > 10 h , Bi-2223 grains covered most part of the LP/Bi-2212 interface and grew much slower afterwards. This might correspond to a slow peritectic transformation process controlled by long range body diffusion.
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