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分析了(Bi,Pb)-2223高温超导材料传导性能进一步提高的影响因素,阐述了熔化处理对改善(Bi.Pb)-2223带材芯部微观结构的优越性.结果表明,传统的(Bi,Pb)-2223相非平衡成相机制严重制约了熔化处理工艺的效果,确立了(Bi,Pb)- 2223相从液相中可逆再形成的可能性,研究了不同条件下(Bi,Pb)-2223相熔化分解-再形成的相演变特征.在适当温度下,(Bi,Pb)-2223相部分熔化分解,生成一种类似于2212化学计量比的液相及碱土铜酸盐2:1-AEC和14:24-AEC,对于其与液相或熔体之间平衡转变关系的建立极为重要.
The influencing factors on the further improvement of the conduction properties of (Bi, Pb) -2223 high-temperature superconducting materials were analyzed, and the superiority of melting treatment on the microstructure of (Bi.Pb) -2223 tape core was discussed. The results showed that the conventional Bi, Pb) -2223 facies phase equilibrating facies system has severely restricted the effect of the melting process. The possibility of reversible formation of (Bi, Pb) - 2223 phase from the liquid phase was established. (Pb, Pb) -2223 phase, the phase of (Bi, Pb) -2223 phase is partially melted and decomposed to form a liquid phase similar to 2212 stoichiometry and alkaline earth cuprate 2 : 1-AEC and 14: 24-AEC, for the establishment of a balanced transition between liquid and melt.