Abstract
The influence of conditions of hot deformation by torsion under pressure and subsequent annealing on the parameters of superconducting transition and critical current density Jc(77 K, 100 Oe) of (Bi,Pb)2Sr2Ca2Cu3O10 + d {Bi(Pb)2223} ceramics was studied. The optimal conditions of post-deformation annealing for superconducting transition recovery were determined to be T = 835 °C, t = 14 h. Post-deformation annealing led to a change in the size of grain colonies and a weakening of the texture of the Bi(Pb)2223 matrix phase. The position of the peak on the temperature dependence of the imaginary component of the AC magnetic susceptibility, Tχ″, and the critical current density Jc were determined. The samples twisted with a rate ω = 1.85×10−4 rpm at T = 855 °C to α = 25 ° and at T = 875 °C to α = 25° possessed the best properties: Tχ″ = 104.4 K, Jc = 9295 A/cm2 and Tχ″ = 104.1 K, Jc = 8098 A/cm2, respectively. Post-deformation annealing resulted in a minimal weakening of the texture in these samples. The weakening of the basal texture in the the post-deformation annealing process was explained by the growth of grain colonies of Bi(Pb)2223 with a non-basal orientation occurring during dynamic recrystallization.
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