Proof-of-principle experiments for react--wind--sinter manufacturing of Bi2Sr2CaCu2Ox magnets

The manufacturing of long lengths of Bi2Sr2CaCu2Ox (Bi2212) wire has led to the development of high-field magnets at low temperature. Both react-and-wind and wind-and-react manufacturing of magnets, however, have significant drawbacks that limit the performance of the conductor in magnet form. In this letter, an alternative approach to magnet manufacturing, react–wind–sinter, is proposed to avoid these drawbacks by splitting the heat treatment into two separate stages, with the temperature/time-sensitive peritectic melting occurring before magnet winding and the remaining solid-state sintering after magnet winding. Results from proof-of-principle experiments show that the split heat treatment does not adversely affect the conductor performance and that the subsequent heat treatment is capable of preventing bending-induced degradation of the conductor if the heat treatment is interrupted just after re-solidification from the peritectic melt.