Bulk high temperature superconductors (HTS) based on the rare-earth barium cuprates [(RE)BCO] have the potential to be applied in a variety of engineering and technological applications such as trapped field magnets, rotating electrical machines, magnetic bearings and flywheel energy storage systems. The key materials figure of merit for most practical applications of bulk superconductors is simply the product of the maximum current density that can be supported, which correlates directly with the maximum achievable trapped magnetic field, and the physical length scale over which the current flows. Unfortunately, however, bulk (RE)BCO superconductors exhibit relatively poor mechanical properties due to their inherent ceramic nature. Consequently, the performance of these materials as trapped field magnets is limited significantly by their tensile strength, rather than critical current and size, given that the relatively large Lorentz forces produced in the generation of large magnetic fields can lead to catastrophic mechanical failure. In the present work, we describe a simple, but effective and reliable reinforcement methodology to enhance the mechanical properties of (RE) BCO bulk superconductors by incorporating hybrid SiC fibres consisting of a tungsten core with SiC cladding within the bulk microstructure. An improvement in tensile strength by up to 40% has been achieved via this process and, significantly, without compromising the superconducting performance of the bulk material.

中文翻译：

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一种用于制造 (RE)-Ba-Cu-O 块状超导体的简单、可靠和稳健的增强方法

基于稀土铜酸钡 [(RE)BCO] 的块状高温超导体 (HTS) 具有应用于各种工程和技术应用的潜力，例如俘获磁场、旋转电机、磁轴承和飞轮能量存储系统。体超导体的大多数实际应用的关键材料品质因数只是可以支持的最大电流密度的乘积，这与最大可实现的俘获磁场直接相关，以及电流流过的物理长度尺度。然而不幸的是，块状 (RE)BCO 超导体由于其固有的陶瓷性质而表现出相对较差的机械性能。最后，考虑到在产生大磁场时产生的相对较大的洛伦兹力会导致灾难性的机械故障，这些材料作为俘获场磁体的性能受到其抗拉强度的显着限制，而不是临界电流和尺寸。在目前的工作中，我们描述了一种简单但有效且可靠的增强方法，通过在体微结构内加入由钨芯和 SiC 包层组成的混合 SiC 纤维来增强 (RE) BCO 体超导体的机械性能。通过该工艺，拉伸强度提高了 40%，而且显着地不会影响大块材料的超导性能。鉴于在产生大磁场时产生的相对较大的洛伦兹力会导致灾难性的机械故障。在目前的工作中，我们描述了一种简单但有效且可靠的增强方法，通过在体微结构内加入由钨芯和 SiC 包层组成的混合 SiC 纤维来增强 (RE) BCO 体超导体的机械性能。通过该工艺，拉伸强度提高了 40%，而且显着地不会影响大块材料的超导性能。鉴于在产生大磁场时产生的相对较大的洛伦兹力会导致灾难性的机械故障。在目前的工作中，我们描述了一种简单但有效且可靠的增强方法，通过在体微结构内加入由钨芯和 SiC 包层组成的混合 SiC 纤维来增强 (RE) BCO 体超导体的机械性能。通过该工艺，拉伸强度提高了 40%，而且显着地不会影响大块材料的超导性能。但有效且可靠的增强方法可以通过在体微结构中加入由钨芯和 SiC 包层组成的混合 SiC 纤维来增强 (RE) BCO 体超导体的机械性能。通过该工艺，拉伸强度提高了 40%，而且显着地不会影响大块材料的超导性能。但有效且可靠的增强方法可以通过在体微结构中加入由钨芯和 SiC 包层组成的混合 SiC 纤维来增强 (RE) BCO 体超导体的机械性能。通过该工艺，拉伸强度提高了 40%，而且显着地不会影响大块材料的超导性能。