Fabrication of Composite High Temperature Superconductor Wires from Ag/YBa sub 2Cu sub 3 O sub x Power Produced by AgNO sub 3 Decomposition

摘要

A brief discussion of the history and generic properties of superconductors isgiven. Arguments favoring the use of microscopically uniform silver additions to the high temperature superconducting ceramic oxide powders are made. After treating some conventional Ag deposition methods and their shortcomings in this application, a novel, inexpensive method involving the decomposition of AgNO3 is presented. Conventional wire fabrication methods, as adapted to processing the high temperature superconductor materials, are discussed. Test equipment for measurement of the important superconducting properties of critical temperature (Tc) and critical current (Jc) is described. Finally, some early results on wire segments fabricated at the Naval Surface Warfare Center (NSWC) are given. (rh)