Preparation,Microstructure and Properties of Ag-sheathed Bi（Pb）-Sr-Ca-Cu-O Superconductor Tapes
来源期刊：Rare Metals1992年第2期
论文作者：周贻茹 叶斌 张建国 王俊升 许亚蓝 张宝仁 刘安生
文章页码：120 - 124
摘 要：<正> The process to obtain high T（110K）phase quickly,the microstructure and properties of Ag-sheathedBi（Pb）-Sr-Ca-Cu-O superconductor tapes have been studied.It was found that the formation time of the highTc phase was greatly shortened by the addition of more Ca and Cu to the nominal composition of Bi（Pb）:Sr:Ca:Cu=2:2:2:3 and the adoption of appropriate sintering temperature and cooling rate.Superconductor powder with predominant high T,phase was prepared after a 840 C/50 h treatment.The Jof the Ag-sheathed tapes and the magnetic field dependence of Jwere obviously improved by repeatedly pres-sing and sintering.The maximum transport current density at 77K in a zero magnetic field was 12,200 A/cm2.The magnetic dependence of Jwas summarized as follows:6.450 A/cm2（B⊥1.B∥S.0.1T）1,810 A/cm2（B⊥1.B∥S,1T）,390 A/cm2（B⊥1.B∥S,2T）（B:magnetic field.1:electric current.S:surface of tapes）.Theimprovement of Jwas attributed to the formation of the plate-like structure with homogeneous compositiondistribution and the strong c-axis texture.
周贻茹，叶斌，张建国，王俊升，许亚蓝，张宝仁，刘安生
摘 要：<正> The process to obtain high T（110K）phase quickly,the microstructure and properties of Ag-sheathedBi（Pb）-Sr-Ca-Cu-O superconductor tapes have been studied.It was found that the formation time of the highTc phase was greatly shortened by the addition of more Ca and Cu to the nominal composition of Bi（Pb）:Sr:Ca:Cu=2:2:2:3 and the adoption of appropriate sintering temperature and cooling rate.Superconductor powder with predominant high T,phase was prepared after a 840 C/50 h treatment.The Jof the Ag-sheathed tapes and the magnetic field dependence of Jwere obviously improved by repeatedly pres-sing and sintering.The maximum transport current density at 77K in a zero magnetic field was 12,200 A/cm2.The magnetic dependence of Jwas summarized as follows:6.450 A/cm2（B⊥1.B∥S.0.1T）1,810 A/cm2（B⊥1.B∥S,1T）,390 A/cm2（B⊥1.B∥S,2T）（B:magnetic field.1:electric current.S:surface of tapes）.Theimprovement of Jwas attributed to the formation of the plate-like structure with homogeneous compositiondistribution and the strong c-axis texture.
关键词：
