[en] In view of the mechanical reinforcement of the Ag sheath of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10-y tapes by dispersion hardening, the effect of TiO₂ additions on the formation of the (Bi,Pb)₂Sr₂Ca₂Cu₃O_10-y phase is studied. By means of DTA measurements, it is found that the onset temperature of partial melting in the precursor powders is lowered when TiO₂ is added. XRD and EDX analysis showed that TiO₂ additions result in the formation of SrTiO₃ and a decrease of the amount of(Bi,Pb)₂Sr₂Ca₂Cu₃O_10-y. Lattice parameter calculations as well as T_c determinations also show that Ti substitution in the (Bi,Pb)₂Sr₂Ca₂Cu₃O_10-y phase, if any, is limited to low values. The interaction occurring between TiO₂ and the precursor powders during the formation of the (Bi,Pb)₂Sr₂Ca₂Cu₃O_10-y phase is described. (author)