Fabrication of Ag sheathed Bi2223 tape with supercold rolling process

Abstract

A novel mechanical deformation process has been developed to fabricate high quality HTS tapes. In this process, the rolling step in the powder in tube technique is replaced by a supercold rolling conducted in liquid nitrogen. The critical current density of the Ag sheathed Bi2223 tapes is significantly enhanced by the supercold rolling. The microstructure observations of the tapes demonstrate that the supercold rolled tape has higher mass density and better grain alignment than the room temperature rolled tape, which are responsible for the high critical current density.