Comparison of The Using of Silver and Stainless Steel 316 Tubes on Fabricating (Bi,Pb)-Sr-Ca-Cu-O Superconducting Wires by PIT Method

Research on Bi1.6Pb0.4Sr2Ca2-xOxCu3Oy monofilment superconducting wires using Ag-sheated and Stainless Steel 316 to reach higher critical temperature (Tc) have been done. Samples were prepared via powder-in-tube method. Powders of Bi2O3,PbO2, SrCO3, CaCO3 and CuO were mixed in stoichiometric ratio.After being mixed, the monofilament billet rolling with diameter (d = 8mm, 6mm, 5mm, 4mm, 2.5mm) were replaced inti the furnance and sinterizeded in air at temperature 850 0C for about ( t = 30h, 24h, 9h) then cooled in a furnace. The samples were submitted to X-Ray Diffraction to determine their crystalline structure. The diffraction pattern of sample BPSCCO monofilament superconducting wires using Ag-sheated shows that the occurrence of phase formation (Bi, Pb) -2223, (Bi, Pb) -2212, CuO and the crystal structure formed on BPSCCO wires sheated Ag is Orthorombic. For the superconducting monofilament BPSCCO sheathed Stainless Steel 316 is amorphous due to the impurity of CuO and the composition of the Stainless Steel tube to the base superconductor material Bi. The surface morphology studied by SEM show that the BPSCCO monofilment superconducting wires using Ag-sheated and Stainless Steel 316 through morphological analysis seen the existence of crack due to the rolling process on the wire, the homogeneity of the sample already looks quite good although the resulting grains melted and distributed randomly. The resistivity analysis, the sample of the BPSCCO monofilament superconducting wires using sheated Ag (Sample A1) around Tc, onset = 98 K and Tc, zero = 72 K and the sample of BPSCCO monofilament superconducting wires using sheathed Stainless Steel 316 (Sample B1) has Tc, Onset 107 K and Tc, zero 49 K and Sample B2 indicate only possible Tc, the onset of the wire is about 80 K. So that the superconducting wire of sheated Stainless Steel 316 can replace the sheated-Ag because the price of Ag cover is relatively more expensive.