Title :
Electromechanical Characterization of Bi-2212 Strands
Author :
Lu, X.F. ; Cheggour, N. ; Stauffer, T.C. ; Clickner, C.C. ; Goodrich, L.F. ; Trociewitz, U. ; Myers, D. ; Holesinger, T.G.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
6/1/2011 12:00:00 AM
Abstract :
The uniaxial strain dependence of critical current was measured both in tension and compression in Bi2Sr2CaCu2O8+x (Bi-2212) high-temperature superconducting round wires. Permanent damage to the critical current easily occurred due to strain. To improve the electromechanical properties of Bi-2212 wires, development of stronger sheathing materials is needed. Ideal materials would be not only mechanically strong, but also chemically compatible with Bi-2212 during the final heat treatment. To identify such materials, we measured stress-strain properties of some new Ag alloys and extracted their respective Young´s modulus values and yield strength. The database may be useful for development of new Bi-2212 strands for fabricating high-field superconducting magnets above 20 T.
Keywords :
Young´s modulus; bismuth compounds; calcium compounds; electrochemistry; heat treatment; high-temperature superconductors; stress-strain relations; strontium compounds; superconducting tapes; yield strength; Bi-2212 strands; Bi2Sr2CaCu2O8+x; Young´s modulus; compression; critical current; electromechanical characterization; heat treatment; high-field superconducting magnets; high-temperature superconducting round wires; sheathing materials; stress-strain properties; uniaxial strain; yield strength; Materials; Metals; Strain; Strain measurement; Superconducting magnets; Temperature measurement; Wires; Axial strain; Bi-2212 wires; Young´s modulus; critical current density; stress-strain; yield strength;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2084061
