Title :
Composite reaction textured Bi-2212 twin current lead structures
Author :
Watson, D.R. ; Chen, M. ; Glowacka, D.M. ; Adamopoulos, N. ; Soylu, B. ; Glowacki, B.A. ; Evetts, J.E.
Author_Institution :
Dept. of Mater. Sci. & Metall., Cambridge Univ., UK
fDate :
6/1/1995 12:00:00 AM
Abstract :
Monolithic twin Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ (Bi-2212) conductors have been fabricated on MgO-LiF, stainless steel and Macor substrates for current lead applications. The composite reaction texturing (CRT) method gives considerable flexibility in design; a composite aligned MgO whisker/Bi-2212 polymer processing route can be shaped before reaction to match the critical current to the system temperature profile. Leads have been designed for conduction cooled zero field 4 K and 77 K. At 4 K the critical current density (J/sub c/) is in excess of 10/sup 5/ A cm/sup -2/, at 77 K J/sub c/ is self-field limited and varies between 10/sup 3/ A cm/sup -2/. Leads 10-20 cm in length were designed for currents of 200 and 1000 A with thermal conduction losses of less than 0.05 W and flexural loads greater than 10 N.<>
Keywords :
bismuth compounds; critical current density (superconductivity); electron device manufacture; heat conduction; heat losses; high-temperature superconductors; losses; strontium compounds; superconducting cables; thermal conductivity; 10 to 20 cm; 200 to 1000 A; 4 K; 77 K; Bi-2212 twin current lead structures; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/; Macor substrate; MgO whisker/Bi-2212 polymer processing; MgO-LiF; MgO-LiF substrate; composite reaction texturing; conduction cooled zero field; critical current density; high temperature superconductors; stainless steel substrate; system temperature profile; thermal conduction losses; Bismuth; Cathode ray tubes; Conductors; Critical current; Critical current density; Polymers; Steel; Strontium; Temperature; Thermal conductivity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
