Tailored joint fabrication process derived ultra-low resistance MgB2 superconducting joint

Patel, Dipak; Matsumoto, Akiyoshi; Kumakura, Hiroaki; Nishijima, Gen; Maeda, Minoru; Kim, Su-Hun; Choi, Seyong; Kim, Jung Ho

doi:10.1016/j.scriptamat.2019.11.020

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Tailored joint fabrication process derived ultra-low resistance MgB2 superconducting joint

Patel, Dipak;
Matsumoto, Akiyoshi;
Kumakura, Hiroaki;
Nishijima, Gen;
Maeda, Minoru;
... Choi, Seyong;
외 2명

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초록

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 x 10(-15) Omega 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

키워드

MgB2 conductor; Superconducting joint; Persistent-mode operation; Closed-loop coil; MRI application; WIRES

제목: Tailored joint fabrication process derived ultra-low resistance MgB2 superconducting joint

저자: Patel, Dipak; Matsumoto, Akiyoshi; Kumakura, Hiroaki; Nishijima, Gen; Maeda, Minoru; Kim, Su-Hun; Choi, Seyong; Kim, Jung Ho

DOI: 10.1016/j.scriptamat.2019.11.020

발행일: 2020-03

유형: Article

저널명: Scripta Materialia

권: 178

페이지: 198 ~ 202