【摘要】 研究了Bi(2223)/Ag超导复合带的微观结构变化及J_c随磁场的依赖关系,实验结果表明:中间压制及烧结工艺有利于杂相的减少及高T_c单相的形成,是提高J_c非常有效的手段;杂相的弥散分布有利于弱连接特性的改善及J_c的提高;随零场下J_c的提高,J_c在磁场下的性能大大改善,但在磁场平行和垂直带面时,影响J_c-B特性的磁通钉扎机制是不同的。我们制备的超导带材的最佳J_c为3.46×10~4A/cm~2(77K,OT)、6.8×10~3A/cm~2(77K,1T)。更多还原

【Abstract】 Microstructure and J_c-B properties of Bi(2223)/Ag tapes have been investigated. It is found that the intermediate pressing and sintering process is favourable for the reduction of impurity phases and the formation of high T_c single phase, and the dispersion of impurity phases leads to a stronger connection between grains, as a result, the J_c values were improved. The J_c values at magnetic fields increased with the increasing of J_c valnes at rezo field, There were different mechanisms for the flux pinning in the parrallel and perpendicular magnetic fields to the specimen surface. The optimum J_c of Superconducting Bi(2223)/Ag tape is 3.46×10~4A/cm~2(77K, 0T)and 6.8×10~3A/cm~2(77K, 1T), respectively.更多还原