Journal
SCRIPTA MATERIALIA
Volume 178, Issue -, Pages 198-202Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.11.020
Keywords
MgB2 conductor; Superconducting joint; Persistent-mode operation; Closed-loop coil; MRI application
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Funding
- Japan Society of the Promotion of Science (JSPS) KAKENHI Grant [JP18F18714]
- Cryogenic Station, Research Network and Facility Services Division, National Institute for Materials Science (NIMS), Japan
- National Research Foundation of Korea - Ministry of Education [NRF-2017R1D1A3B03035092]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [20002088]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20002088] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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