The Effect of Alumina Additions on the Processing of Bi‐2212 Conductors

Abstract

Bi2Sr2CaCu2Oy (Bi‐2212) conductors are of interest for magnet applications in high magnetic fields at 4 K. The partial melt approach affords an economical, single processing step for the conductor heat treatment. However, work remains to be done to optimize compositions and conductor performance. In this paper, the beneficial effects of alumina additions for the melt‐processing of Bi‐2212 conductors are reported. It is found that for conventional melt processing, the alumina additions broaden the processing window for the peak melting temperature and improve the critical current density of the conductors. With regards to the microstructure, the alumina additions appear to inhibit the growth of alkaline‐earth cuprates.