Title :
Advances in the development of silver sheathed (Bi,Pb)2223 composite conductors
Author :
Carter, W.L. ; Riley, G.N., Jr. ; Otto, A. ; Parker, D.R. ; Christopherson, C.J. ; Masur, L.J. ; Buczek, D.
Author_Institution :
American Supercond. Corp., Westborough, MA, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
Significant advances have been made in the critical current density of the technologically interesting (Bi,Pb)2223 composite conductors. Engineering current density, J/sub e/, of 9100 A/cm/sup 2/, corresponding to a filament current density, J/sub c/, of 32600 A/cm/sup 2/ (77 K, self-field) has been achieved by increasing the fraction of oxide in the conductor and improving the thermomechanical processing of the conductor. The filament microstructure may be further optimized by decreasing the volume fraction of secondary phases and porosity. The strain tolerance of the higher oxide fraction conductors remains adequate for applications by increasing the number of filaments in the conductors. Composite tapes with twisted filaments have been produced that have promising electrical properties in applied magnetic fields.<>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); deformation; high-temperature superconductors; lead compounds; materials preparation; multifilamentary superconductors; powder technology; silver; strontium compounds; thermomechanical treatment; (BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/-Ag; Ag sheathed composite conductors; composite tapes; critical current density; filament current density; filament microstructure; high temperature superconductor; porosity; secondary phases; strain tolerance; thermomechanical processing; Billets; Conducting materials; Conductors; Current density; Magnetic field induced strain; Powders; Silver; Superconducting filaments and wires; Superconducting materials; Thermomechanical processes;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
