Critical current response of BSCCO tapes in tension
Critical current response of BSCCO tapes in tension
复制标题
BSCCO 带在张力下的临界电流响应
DOI：
10.1007/bf02652987
复制
发表时间：
1995
影响因子：
2.1
通讯作者：
K. V. Salazar
中科院分区：
文献类型：
--
作者：
W. Blumenthal;R. A. Moore;J. Coulter;J. Bingert;K. V. Salazar
在单丝 Bi1.9Pb0.4Sr2Ca2Cu3Ox (BSCCO) 银带和纯银带上进行单轴拉伸实验。还测试了几乎不含银的 BSCCO 带，以研究银相的影响。临界电流密度 (Jc) 与施加应变的原位测量为超导氧化物芯的强度和失效行为提供了证据。最终轧制变形用作主要加工变量。 BSCCOAg 胶带在超导性能开始下降之前表现出高达 0.4% 的应变耐受性。接近无银芯的应力-应变响应是典型的陶瓷，在 0.19% 的弹性应变后发生脆性破坏。尽管没有优化，屈服强度和 Jc 随最终轧制变形的增大而提高。通过改善氧化物芯的结构和完整性以及通过增加由于与银护套的热膨胀不匹配而施加在芯上的残余压应力，可以假设具有更大的应变耐受性。
Uniaxial tension experiments were performed on monofilament Bi1.9Pb0.4Sr2Ca2Cu3Ox (BSCCO)-silver and pure silver tapes. Nearly silver-free BSCCO tapes were also tested to study the influence of the silver phase.In situ measurements of the critical current density (Jc) vs applied strain provided evidence for the strength and failure behavior of the superconducting oxide core. Final rolling deformation was used as the primary processing variable. BSCCOAg tapes exhibited strain tolerance of up to 0.4% before the superconducting performance began to degrade. The stress-strain response of a near silver-free core was typical of ceramics with brittle failure occurring after an elastic strain of 0.19%. Although not optimized, the yield strength and Jc improved with greater final rolling deformation. Even greater strain tolerance is postulated by improving the structure and integrity of the oxide core and by increasing the residual compressive stress imposed on the core by the thermal expansion mismatch with the silver sheath.