NEW ROLLING TECHNIQUE FOR TEXTURING OF BI(2223) AG TAPES/

A new rolling technique, so called 'eccentric rolling', has been devel oped for texture and density improvement in Bi(2223)/Ag tapes made by PIT. It consists in rolling deformation between the outer surface of t he inner roller and inner surface of the outer hollow cylinder. This t echnique allows to deform the BSCCO/Ag composite in a way which is sim ilar to flat rolling using rollers of very large radius or to a 'conti nual' pressing but without any overlapping parts. In comparison to cla ssical rolling with roller of a similar radius, a higher core density and widening of tape have been obtained. The transport critical curren t densities have been measured for single-filament and 19-filament tap es deformed by the roller presented and a classical roller. Current de nsities which are two times higher than in the case of classical rolle r (at T = 77 K, B = 0 T) have been measured for both types of tapes de formed using the new technique presented.