Hot rolling of silver-sheated Bi (2223) tapes

Abstract Silver-sheated Bi(2223) tapes have been prepared using a newly developed hot-roll apparatus where the rolls can be heated. up to 850°C. At 77 K and 0 T, a critical current density of 18 000 A/cm 2 has been measured on tapes after hot rolling at 800°C. Microstructural analyses and X-ray diffraction have been performed. The field dependence and the anisotropy of the critical current were investigated at 77 K. The hot-rolled tapes show a higher density and better grain alignment compared to cold-rolled tapes. The critical current density at 77 K and 1 T is 3500 A/cm 2 , i.e., it decreases by a factor of 5 will respect to the value in zero field. This is a considerable improvement compared to the published data on cold-rolled tapes where this factor is almost 7 for our reference tape and between 8 and 12 in the published data.