Elsevier

Scripta Materialia

Volume 178, 15 March 2020, Pages 198-202
Scripta Materialia

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

https://doi.org/10.1016/j.scriptamat.2019.11.020Get rights and content

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 (Ic) 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 Ic 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.

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Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

This work was supported by the Japan Society of the Promotion of Science (JSPS) KAKENHI Grant Number JP18F18714, and Cryogenic Station, Research Network and Facility Services Division, National Institute for Materials Science (NIMS), Japan. Dipak Patel is a JSPS International Research Fellow. This work was also partially supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2017R1D1A3B03035092) and Technology

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