Characterization of Hot Isostatically Pressed Bi–Sr–Ca–Cu–O as a Function of Consolidation Variables

Abstract

Fully dense, bulk Bi2Sr1.7CaCu2Ox (2212) superconductor pellets were made by hot isostatic pressing in an inert atmosphere. Electron microscopy revealed that rotation and bending of the platelike 2212 grains were responsible for much of the densification. Under processing conditions of 825°C and 105 MPa, dense pellets were obtained in 15 min. Many dislocations, planar faults, and, perhaps, intergrowths of the Bi2Sr2CuOx phase were produced during pressing. The dislocations were largely present in subgrain boundaries when the pressing times were increased to 45–120 min.

Practical superconductor development for electrical power applications

“…The effect of mechanical deformation and HIPing (Goretta et al, 1992c) on the development of microstructure has been studied for BSCCO 2212 to gain insight into the thermomechanical processing steps required for fabrication of wires and tapes. The microstructure evolves from a loose packing of powders to a fully dense structure within 15 min of HIPing at 825"C. Samples deformed at high temperature m_der compression have shown that strain is accommodated by a combination of dislocation glide and microcracking.…”