Fabrication of Multilayer Wire of Bi-2223 Superconductor

Abstract

In the pursuit of applying oxide superconductor to an electric power equipment using liquid nitrogen, we contrived to fabricate the multilayer wire with the multilayered structure consisting of Bi-2223 layers and silver layers. The wire features in thin and uniform Bi-2223 layers and a handily reducible silver ratio (1-λ)/λ. After all, a high critical current density (Jc) and a high critical current (Ic) have been materialized concurrently; an overall critical current density (λ,Jc) was successfully upgraded. For example, the 0.3mm thick tape wire exhibited Jc=8900 A/cm2, λJc=2000 A/cm2 at 77K and 0T. The Bi-2223 wire surpasses the Bi-2212 wire in temperature and strain dependencies of Jc. Considering the above findings, the Bi-2223 multilayer wire is presumed to be fairly fit for application to an electric power equipment using liquid nitrogen.