Correlation between microstructure and superconductivity in advanced coated conductors architectures based on technical templates

基于技术模板的先进涂层导体结构中的微观结构和超导性之间的相关性

• 批准号: 416095983
• 负责人: Dr. Ruben Hühne
• 金额: --
• 依托单位: Institut für Metallische Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/416095983?language=en
• 关键词: Correlation; between; microstructure; superconductivity; advanced

The application of high temperature superconductors in cables or coils with a high current transport capability requires materials with a strong crystallographic texture to reduce the detrimental effect of high angle grain boundaries. To realize such properties, the superconducting layers are epitaxially grown on highly textured, metal-based templates. Nowadays, such textured templates are routinely produced in long length using different approaches. Beside the strong crystallographic texture, such coated conductors reveal a characteristic grain boundary network, which depends on the template used as well as on the preparation route of the superconductor itself. In any case, this grain boundary network determines the global current transport in a decisive way. Therefore, it is crucial to understand the correlation between the local grain structure of the superconductor and the local current transport in order to optimize the performance of the coated conductors. The detailed knowledge will finally enable a more cost efficient fabrication of such conductors in order to open new application prospectives or to replace existing materials, which require an expensive Helium cooling.Therefore, the major aim of this joint project is to correlate the properties of the grain boundary network in the superconductor itself with the local current transport. To realize this goal, advanced high-resolution techniques will be applied to determine the current flow on a grain level. These methods allow identifying limiting areas in these materials, which reduce the global current transport. In particular, it is planned to study the influence of incorporating artificial secondary phases as well as the use of novel liquid-assisted deposition methods on the local current transport in such grain boundary networks. Simultaneously, recently developed Fe-based superconductor layers will be investigated in order to evaluate, if the improved transport behavior of their grain boundaries results in advantages for such coated conductor architectures if compared to the typically used cuprate materials. Finally, the identified correlations between the microstructure and the local current flow will be used to model the global current transport in these coated conductors, which enables a further optimization for the respective applications.

高温超导体在具有高电流传输能力的电缆或线圈中的应用需要具有强晶体织构的材料，以减少大角度晶界的有害影响。为了实现这些特性，超导层在高度纹理的金属基模板上外延生长。如今，这种纹理模板通常使用不同的方法以长的长度生产。除了强的晶体学纹理，这种涂层导体揭示了一个特征晶界网络，这取决于所使用的模板以及超导体本身的制备路线。在任何情况下，这种晶界网络以决定性的方式决定了全局电流输运。因此，了解超导体的局部晶粒结构与局部电流输运之间的相关性对于优化涂层导体的性能至关重要。详细的知识最终将使这种导体的制造更具成本效益，以开辟新的应用前景或取代现有的材料，这需要昂贵的氦冷却。因此，这个联合项目的主要目标是将超导体本身的晶界网络的性质与局部电流传输相关联。为了实现这一目标，将采用先进的高分辨率技术来确定颗粒水平上的电流。这些方法允许识别这些材料中的限制区域，从而减少全球电流传输。特别是，它计划研究的影响，将人工第二相，以及使用新的液体辅助沉积方法的局部电流传输在这样的晶界网络。同时，最近开发的铁基超导体层将进行调查，以评估，如果改善其晶界的传输行为的结果，在这种涂层导体架构的优势，如果相比，通常使用的铜酸盐材料。最后，微结构和局部电流之间的相关性将被用来模拟这些涂层导体中的全局电流传输，这使得进一步优化各自的应用。