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