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

FIELD: superconductor engineering; short and long multiconductor strips for electrical equipment. SUBSTANCE: proposed method is characterized in that complete metal ampoule is manufactured, filled with powdered superconducting compound or half- finished products so as to ensure that space factor of single core were 20- 60%, ampoule-and-powder system is deformed to obtain desired thickness of 0.35-5 mm by drawing through roller-type die at deformation rate of 1-15% per pass, complex billet is formed by filling metal billet of oval-section shell with desired quantity of measured parts of ampoule-and-powder system so as to ensure final space factor of multiconductor item between 25 and 55 %, complex billet is deformed to desired size at deformation rate of 1-12% per pass followed by thermomechanical treatment in several stages at 800-850 C for time required to obtain superconducting phase of desired composition and structure within ceramic core with intermediate deformations conducted between stages. Metal billet of oval-section shell is obtained by upsetting to size of metal billet of round-section shell. Complex billet is deformed to desired size by lengthwise-and-cross rolling or by cross or lengthwise rolling at deformation rate of 5-15% per pass or by drawing through roller-type die at deformation rate of 3-10% per pass. Intermediate deformations are conducted during thermomechanical treatment by lengthwise-and-cross rolling or by cross or lengthwise rolling at deformation rate of 5-15% per pass, or by drawing through roller-type die. Multiconductor strips obtained are 25 times wider than narrow ones and are capable of carrying 9.3 times higher critical currents. EFFECT: enlarged functional capabilities of strips due to their greater width. 10 cl