Pb・CdフリーNbTi／Nb₃Sn超伝導接合技術の開発

抄録

This paper reviews the Pb- and Cd-free NbTi/Nb₃Sn superconducting joint technology and the related technologies. The key to the Pb-free joining process is the use of a high-temperature tolerable Nb superconducting alloy as an intermediate material, which enables metallic bonding between the Nb₃Sn wire and the Nb superconducting alloy intermediate material through a chemical reaction, and between the NbTi wire and the Nb superconducting alloy intermediate material by pressure welding. Consequently, the NbTi/Nb₃Sn superconducting joint is realized. This novel technology is expected to be used in the world’s first Pb-free, environmentally friendly NMR superconducting magnets.