Tailored joint fabrication process derived ultra-low resistance MgB2 superconducting joint. (15th March 2020)

• Record Type: Journal Article
• Authors: Patel, Dipak; Matsumoto, Akiyoshi; Kumakura, Hiroaki; Nishijima, Gen; Maeda, Minoru; Kim, Su-Hun; Choi, Seyong; Kim, Jung Ho
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 198
• Page End: 202
• Publication Date: 2020-03-15
• Subjects: MgB2 conductor -- Superconducting joint -- Persistent-mode operation -- Closed-loop coil -- MRI application; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report an ultra-low resistance superconducting joint using unreacted multifilament MgB2 wires produced by tailoring the powder compaction pressure within the joint with heat treatment conditions. The joint demonstrated an ultra-low resistance of 5.48 × 10 −15 Ω and critical current ( I c ) of 91.3 A at 20 K in self-field. The microstructural and composition studies of the joint revealed cracks and a high amount of MgO, respectively. These two features reduced the I c of the joint to some extent; nevertheless, the joint resistance was not affected by it. Our tailored joining process will play a pivotal role in the superconducting joints development. Graphical abstract: Image, graphical abstract