Glowacki Bartlomiej Andrzej
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
Institute of Power Engineering, DZE-2, ul. Mory 8, 01-330 Warsaw, Poland.
Materials (Basel). 2023 Oct 7;16(19):6588. doi: 10.3390/ma16196588.
The superconducting joints of superconducting in situ MgB wires have been of great interest since the first MgB wires were manufactured. The necessity of joining fully reacted wires in applications such as NMR brings complexity to the methodology of connecting already reacted wires sintered under optimised conditions via a mixture of Mg + 2B and subsequential second heat treatment to establish fully superconducting MgB joints. Some of the data in the literature resolved such a procedure by applying high cold pressure and sintering at a low temperature. A topical review publication did not address in depth the question of whether cold sintering is a potential solution, suggesting that hot pressing is the way forward. In this paper, we discuss the potential joint interfacial requirements, suggesting a thermo-mechanical procedure to successfully form a superconductive connection of two in situ reacted wires in the presence of Mg + 2B flux. The critical current at 25 K of the researched junction achieved 50% I for an individual in situ wire.
自首次制造出MgB原位超导导线以来，其超导接头一直备受关注。在诸如核磁共振（NMR）等应用中，连接完全反应的导线的必要性给连接方法带来了复杂性，这些导线是通过Mg + 2B混合物在优化条件下烧结并随后进行二次热处理以形成完全超导的MgB接头的。文献中的一些数据通过施加高冷压并在低温下烧结解决了这一过程。一篇专题综述出版物并未深入探讨冷烧结是否是一种潜在解决方案的问题，而是表明热压是前进的方向。在本文中，我们讨论了潜在的接头界面要求，提出了一种热机械程序，以在Mg + 2B助熔剂存在的情况下成功形成两根原位反应导线的超导连接。对于单根原位导线，所研究接头在25K时的临界电流达到了50%I。
