Evolution of core density of Ag-clad Bi-2223 tapes during process
Evolution of core density of Ag-clad Bi-2223 tapes during process
复制标题
镀银 Bi-2223 胶带在加工过程中芯密度的演变
DOI：
10.1109/77.919833
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发表时间：
2001
影响因子：
1.8
通讯作者：
D. Larbalestier
中科院分区：
文献类型：
--
作者：
Jianyi Jiang;X. Cai;J. G. Chandler;M. Rikel;E. Hellstrom;R. Parrella;Dingan Yu;Qi Li;M. Rupich;G. N. Riley;D. Larbalestier
通过质量密度测量、显微组织观察和超导性能表征，研究了（Bi，Pb）/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/（Bi-2223）包银带材在形变热处理过程中的孔隙率及其对临界电流密度J/sub c/的影响。即使J/sub c/ is /spl sim/50 kA/cm/sup 2/（77 K，0 T），19丝带的最终丝的相对质量密度也小于75%。单丝中的质量密度达到90%，因为在第一热处理（HT 1）期间的逆向致密化较少或甚至不存在。织构良好的Bi-2223晶粒生长可导致单丝复合材料在第一次热处理期间的显著致密化。我们的研究结果暗示在相当大的变化，在这个重要的属性的Bi-2223磁带。
The porosity and its effect on critical current density J/sub c/ of Ag-clad (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ (Bi-2223) tapes throughout important steps in their thermomechanical treatment was investigated by using mass density measurement, microstructural observation, and superconducting property characterization. The relative mass density of the final filament for 19 filament tape was less than 75%, even though the J/sub c/ is /spl sim/50 kA/cm/sup 2/ (77 K, 0 T). The mass density in monofilaments reached 90%, because retrograde densification during the first heat treatment (HT1) was less or even absent. Well textured Bi-2223 grain growth could result in a significant densification during the first HT in the monofilament composite. Our results hint at considerable variability in this important property of Bi-2223 tape.