Patel Dipak, Matsumoto Akiyoshi, Kumakura Hiroaki, Moronaga Taku, Hara Yuka, Hara Toru, Maeda Minoru, Hossain Md Shahriar A, Yamauchi Yusuke, Choi Seyong, Kim Jung Ho
High-Temperature Superconducting Wire Group, Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
Electron Microscopy Analysis Station, Research Network and Facility Services Division, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
ACS Appl Mater Interfaces. 2021 Jan 20;13(2):3349-3357. doi: 10.1021/acsami.0c17385. Epub 2021 Jan 5.
A superconducting joint of unreacted monofilament internal magnesium diffusion-processed magnesium diboride (MgB) wires was fabricated by exploiting the phenomenon of magnesium diffusion into the boron layer inside the superconducting joint. Unprecedentedly, the joint was able to carry an almost identical transport current compared to the bare wire in a 2-7 T magnetic field at 20 K. The joint also exhibited very low joint resistance of 2.01 × 10 Ω in self-field at 20 K. Among commercially available superconductors, this work is the first to successfully realize a superconducting joint that is capable of transferring current from one conductor to another without any notable degradation under strong magnetic fields. This work demonstrates great potential to apply MgB in a range of practical applications, where superconducting joints are essential.
通过利用镁扩散到超导接头内部硼层的现象，制备了未反应的单丝内镁扩散处理的二硼化镁（MgB）线的超导接头。前所未有的是，在20K的2 - 7T磁场中，该接头能够承载与裸线几乎相同的传输电流。该接头在20K自场中的接头电阻也非常低，为2.01×10Ω。在市售的超导体中，这项工作首次成功实现了一种超导接头，该接头能够在强磁场下将电流从一个导体传输到另一个导体而不会有任何明显的性能下降。这项工作展示了将MgB应用于一系列实际应用的巨大潜力，在这些应用中，超导接头至关重要。
