Title :
Large shaped parts of melt cast BSCCO for applications in electrical engineering
Author :
Bock, J. ; Bestgen, H. ; Elschner, S. ; Preisler, E.
Author_Institution :
HOECHST AG, Hurth, Germany
fDate :
3/1/1993 12:00:00 AM
Abstract :
A melt casting process (MCP) that is tailor made for BSCCO, especially for the 2212 phase, is described. It is reported that melt casting offers an easy access to a variety of different shapes and sizes. The properties of the material obtained by MCP have been significantly improved by admixing strontium sulphate. J/sub c/ values superior to those of sintered ceramics of YBCO or BSCCO have been obtained: J/sub c/ values at 55000 A/cm/sup 2/ (4 K) and 2200 A/cm/sup 2/ (77 K) were achieved without external fields; large bulk parts exhibited more than 2000 A (77 K) in their self-field. The peculiarities of MCP allow the integration of noble metal current contacts which exhibit total resistances >
Keywords :
bismuth compounds; calcium compounds; casting; critical current density (superconductivity); high-temperature superconductors; strontium compounds; transmission electron microscope examination of materials; 2212 phase; 4 K; 77 K; 980 to 1200 C; BiSrCaCuO-SrSO/sub 4/; HTSC powders; MCP; TEM; critical current density; current leads; electrical engineering; high temperature superconductors; hollow cylinders; inductive current limiters; melt cast BSCCO; melt casting process; microstructure; sintered ceramics; Bismuth compounds; Casting; Ceramics; Composite materials; Contacts; Engine cylinders; Heating; Shape; Strontium; Superconducting materials;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
