Fundamental and Applied Studies of Explosively Fabricated High-Temperature Superconducting Fixtures

摘要

We have explosively fabricated a wide variety of monolithic superconductor metal matrix fixtures in a variety of tooling plate geometries, including a design which allowed the channels to be evacuated prior to and during the fabrication process. Tooling plates and fabricated monoliths were utilized in both silver and copper. Channel schedules included pure high quality YBa2Cu307 superconducting powder having a size distribution of roughly 0.2 to 20 micrometers, and mixtures of superconducting (SC) powder with metal powders: 10%, 20% and 30% silver powder primarily in the silver tooling plate, and the same volume fractions of metal powder loading in copper tooling plates. We were able to demonstrate that tape and ribbon could be easily cold rolled in a multiple pass rolling process from explosively-fabricated linear, monolithic precursors by as much as 95% (to a tape thickness of 0.15 mm). The silver tapes have the convenience of allowing for an annealing treatment or treatment series which can connect the superconducting tape core for supercurrent transport. (mjm)