Bi-2223/Ag超导多芯带材的内切轧制研究

Inscribed Rolling Technique of Bi-2223/Ag Superconducting MF Tape

研究了Bi 2 2 2 3 /Ag超导多芯带材在一种新的加工方式—内切轧制过程中性能和组织的变化规律 ,采用XRD和SEM等测试方法对带材结构和组织进行了分析 ,并结合传统平辊轧制进行了对比。研究表明 ,相对于平辊轧制 ,内切轧制内辊和平辊轧制辊径相同时 ,采用内切轧制可以有效改善超导带材的组织结构 ,使得超导芯结构更加均匀 ,并增加超导芯的致密度 ,还可以有效改善带材内的银超界面状态 ,提高超导带材的电流传输性能。

A new rolling technique, so called 'inscribed rolling', was developed for superconductivity improvement in Bi (2223)/Ag tapes. The XRD and SEM methods were applied for analyzing the structure of the tape. In comparison with classical rolling by roller with the same radius, an uniform superconductor distribution and better microstructure in cores were obtained by present tecnique . The core of the tape is densified and the interface between the core and silver is much better. Improved superconducting current at 77 K and zero field was measured from multifilamentary tapes deformed with the new technique.