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首页> 外文期刊>Physica, C. Superconductivity and its applications >Metal-ceramics interface response to bending and fatigue cycles in superconducting Ag-Bi2223 composites
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Metal-ceramics interface response to bending and fatigue cycles in superconducting Ag-Bi2223 composites

机译：超导Ag-Bi2223复合材料中金属陶瓷界面对弯曲和疲劳循环的响应

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摘要

Bending cycles in superconducting composites lead to degradation of their transport properties. We had studied this effect on Ag-Bi2223 composites, in the form of tapes with 1, 7 and 19 ceramic filaments. The samples were subjected to increasing bending-straightening strains, measuring the critical current density J sub(c) at 77 K, 0 T after each cycle, in order to determine the maximum allowed strain ( epsilon sub(max)) before degradation of the J sub(c) occurs. Fatigue tests were performed by cycling the tapes on bending to a fixed radius. For this purpose, two mandrels with different diameters were selected: one resulting in strains epsilon < epsilon sub(max) and the other in epsilon > epsilon sub(max). The behavior of J sub(c) as a function of the number of cycles was observed for the three composites, indicating that multifilamentary tapes withstand cycling better. As the transport properties in composite superconductors are mainly characterized by their metal-ceramic interface, the silver sheath was chemically removed after the last cycle to investigate the interfacial microstructure. The exposed ceramics was observed with SEM to identify the crack formation mechanism: mainly intergranular cracks in the face subjected to tension and transgranular cracks in the face subjected to compression.
机译：超导复合材料的弯曲循环会导致其传输性能下降。我们已经研究了这种对Ag-Bi2223复合材料的影响，其形式为带有1、7和19陶瓷丝的带。样品经受增加的弯曲矫直应变，在每个循环后在77 K，0 T下测量临界电流密度J sub（c），以便在样品降解之前确定最大允许应变（epsilon sub（max））。 J sub（c）发生。疲劳测试是通过将胶带在弯曲到固定半径时循环进行的。为此，选择了两个直径不同的心轴：一个导致应变epsilon epsilon sub（max）。对于三种复合材料，观察到J sub（c）随循环次数变化的行为，表明复丝带更好地耐受循环。由于复合超导体的传输性能主要由其金属-陶瓷界面来表征，因此在最后一次循环后化学去除了银护套，以研究界面微结构。用SEM观察暴露的陶瓷以确定裂纹形成机理：主要是受拉力的面中有晶间裂纹，而受压面的中有透晶性裂纹。

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