Digital Commons Network^™

Microstructure Observations Of Ag And Ag-Alloy Sheathed Bi2223 Tapes, Hua-Kun Liu, R. Zeng

Faculty of Engineering - Papers (Archive)

Abstract—37 filament Bi2223 tapes with different configurations of Ag, AgAu7wt% AgSb0.6wt% and AgMg0.2wt% as the precursor and restack sheaths were fabricated using commercial Bi2223 precursor material and powder-in-tube techniques. Short length samples were heat treated at a temperature in the range of 832 C to 846 C for the first stage (HT 1), followed by a second stage (HT 2) at 825 C for 40 h and slow cooled to 785 C. An intermediate roll pass was performed between the heat treatment stages. The critical current (Ic) of the tapes was measured at 77 K in self-field and in fields …