Bi2Sr2CaCu2Ox superconducting tapes sheathed in Ag-Cu alloy and in Ag for comparison, have been prepared using a powder-in-tube method. The mechanically stronger AgCu alloy improves the mechanical and superconducting properties of the tape. Compaction of the core by the stronger alloy sheath leads to a greater critical current density (Jc). Values of Jc of 5 × 103 A/cm2 and 8 × 103 A/cm2 were obtained at 77.6 K for 0.2 mm thick Ag and AgCu-sheathed tapes respectively. The critical temperature of the AgCu-sheathed tape appeared to be higher than that of the silver-sheathed one. The microstructure observed for both kinds of tape by means of scanning electron microscopy showed more aligned structure of Bi-2212 grains and a smaller amount of secondary phases in the Ag-sheathed tape.