Multifilamentary Bi-2223 composite tapes made by a metallic precursor route
Multifilamentary Bi-2223 composite tapes made by a metallic precursor route
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采用金属前驱体路线制造的多丝 Bi-2223 复合带
DOI：
10.1109/77.233845
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发表时间：
1993
影响因子：
1.8
通讯作者：
Alexis P. Malozemoff
中科院分区：
文献类型：
--
作者：
Alexander Otto;L. Masur;J. Gannon;E. Podtburg;D. Daly;G. J. Yurek;Alexis P. Malozemoff
研究了一种基于金属前驱体的高丝数氧化物超导体银复合带的制备工艺，该工艺在零场77 K下的临界电流密度可达7.5 kA/cm/sup 2/。由这些胶带制成的30厘米原型多股导体在9厘米的规长上，在77 K下具有240 A的临界电流，平均临界电流密度为6 kA/cm/sup /。研究了由含有多达10000个铋-2223超导氧化物丝的金属前驱体制成的带的力学性能。临界拉伸应变平均为0.6%，弯曲试验显示电流密度下降可忽略不计，表面应变可达0.70%。当表面弯曲应变超过0.70%时，临界电流下降遵循一个简单的模型，该模型基于超过临界拉伸应变的广泛丝损伤。与类似加工的银相比，复合带的流动应力增加，表明氧化丝对复合材料有相当大的增强作用
A process based on metallic precursors has been developed for manufacturing high filament count oxide superconductor-silver composite tapes with critical current densities of up to 7.5 kA/cm/sup 2/ at 77 K in zero field. A 30-cm prototype multistrand conductor made of these tapes has a critical current of 240 A at 77 K over a 9 cm gauge length, with an average critical current density of 6 kA/cm/sup 2/. The mechanical properties of tapes made from metallic precursors containing up to 10000 Bi-2223 superconducting oxide filaments were investigated. Critical tensile strains average 0.6%, and bend tests show negligible dropoff in current density up to a 0.70% surface strain. The critical current decrease beyond the 0.70% surface bend strain follows a simple model based on extensive filament damage beyond the critical tensile strain. Increased flow stresses of the composite tapes, compared to similarly processed silver, indicate considerable strengthening of the composite by the oxide filaments.<<ETX>>