Title :
Near-net-shape fabrication of continuous Ag-clad Bi-based superconductors
Author :
Lanagan, M.T. ; Goretta, K.C. ; Walter, D.K. ; Poeppel, R.B. ; Troendly, R. ; McNallan, M.J. ; Danyluk, S.
Author_Institution :
Energy Technol. Div., Argonne Nat. Lab., IL, USA
fDate :
6/1/1999 12:00:00 AM
Abstract :
We have developed a near-net-shape process for Ag-clad Bi-2212 superconductors. This alternative to the powder-in-tube process offers the advantages of nearly continuous processing, minimization of processing steps, reasonable ability to control the Bi-2212/Ag ratio, and early development of favorable texture of the Bi-2212 grains. The powder is rolled into an Ag channel, a cap is applied, and the assembly is lightly rolled. To minimize distortion during heat treatment, it is especially important that the Bi-2212 powder be nearly free of volatile species such as carbon. A vacuum-calcination process was developed to control CO/sub 2/ evolution during heating. Superconducting properties are discussed.
Keywords :
bismuth compounds; calcium compounds; composite superconductors; heat treatment; high-temperature superconductors; powder technology; silver; strontium compounds; superconducting tapes; 2212 superconductors; Ag; Bi-2212 grains; Bi-2212/Ag ratio; BiSrCaCuO; CO/sub 2/ evolution; HTSC; continuous Ag-clad Bi-based superconductors; heat treatment; minimization; near-net-shape fabrication; nearly continuous processing; processing steps; superconducting properties; texture; vacuum-calcination process; Fabrication; Furnaces; Heat treatment; High temperature superconductors; Manufacturing processes; Powders; Superconductivity; Temperature control; US Department of Energy; Wire;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
