Superconducting Properties of Nb sub 3 Sn Multifilamentary Wires Fabricated by Internal Tin Process

摘要

The heat treatments were divided into prerection and reaction-treatments. The main microstructural difference in the two heat treatments lie in the amounts of the large Kirkendal's voids. The grain size increased at the higher temperatures. The superconducting critical temperature and current density were measured. It is believed that a current density of greater than or equal to 1200 A/mm exp 2 can be achieved if the filament size and heat treatment can be optimized. (ERA citation 08:055957)