Fabrication and improvement of silver sheathed (Bi,Pb)2Sr2Ca2Cu3010 Tapes powder-in-tube technique

This thesis concentrated on the processing of silver sheathed (Bi,Pb)2Sr2Ca2Cu30io (Bi- 2223) tapes which were made by powder-in-tube technique. The mature powder consisted of (Bi, Pb)2Sr2.xCai+xCu208 (0 < x < 1), SrCaCuO and Ca2Pb04 was made in our laboratory using spray dry machine. The best tapes with Jco of 4.5 X AJCTC? (conductor Jco of 1 x lO"^ A/cm^) were achieved in 100 hours sintering time at 77 K in self-field. Reproducibility of the tapes was improved by control of the phase assemblage of the precursor powder.