Superconducting Properties of (Nb,Ti) sub 3 Sn Wires Fabricated by the Bronze Process

摘要

A study was made of the influence of the alloying addition of Ti in the Nb core on the superconducting critical properties since (1) Ti is less expensive than Nb or Ta, (2) Ti has a lower melting temperature than Ta and Nb, thus making the alloy fabrication easier, (3) Ti-Nb alloys are also known to be easily fabricated in composite wires with Cu, and finally (4) it appears that an increased normal-state resistivity rho/sub n/, and therefore the upper critical field H/sub c2/, will lead to enhanced J/sub c/ at high fields. It is expected that the addition of Ti will increase the rho/sub n/ of the Nb sub 3 Sn. As shown in preliminary results, small additions of Ti to the Nb can significantly enhance critical-current densities of Nb sub 3 Sn at high magnetic fields (H > 12 T). A detailed account of this study is given. (ERA citation 06:033502)