METHOD FOR PRODUCING HIGH-TEMPERATURE COMPOSITE SUPERCONDUCTOR ITEMS Russian patent published in 2000 - IPC

FIELD: superconductor engineering; short and long composite wide superconductor strips for electrical equipment. SUBSTANCE: method is characterized in that hollow round-section metal ampoule is formed, upset to desired size of oval-section ampoule, and ampoule obtained is filled with powdered superconductor compound or half- finished product so as to ensure space factor of 20-60%, ampoule-and-powder system obtained is deformed to desired size at deformation rate of 1-10% per pass followed by thermomechanical treatment including several steps of heat treatment at 810-860 C for time required to form phase of desired composition and structure within ceramic core with intermediate deformations conducted in the process at deformation rate of 1-12% per pass. Ampoule- and-powder system is deformed to desired size by lengthwise-and-cross rolling at deformation rate of 2-10% or by cross rolling at deformation rate of 2-10% per pass, or by lengthwise rolling at deformation rate of 2-10% per pass, or by drawing through roller-type die at deformation rate of 1-8% per pass. Multiconductor strips obtained are 33 times wider than narrow ones and carry 6.7 times higher critical currents. EFFECT: facilitated procedure, enlarged functional capabilities of wide strips. 9 cl