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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)。
The microstructural changes of Bi (2223) / Ag superconducting composite tapes and the dependence of Jc on the magnetic field were studied. The experimental results show that the reduction of heterophasic phase and the formation of high Tc single phase are beneficial to the improvement of Jc Very effective means; dispersion distribution of heterogeneous phase is conducive to the improvement of weak connection characteristics and Jc; with the J_c increase at zero field, J_c performance greatly improved in the magnetic field, but in the magnetic field parallel and vertical band, the impact J_c-B characteristics of the flux pinning mechanism is different. The best J_c of the superconducting tapes we prepared was 3.46 × 10 ~ 4A / cm ~ 2 (77K, OT) and 6.8 × 10 ~ 3A / cm ~ 2 (77K, 1T).