METHOD OF PRODUCTION OF THIN-WALLED TUBULAR BILLET FROM Nb OR Ta INGOT FOR FORMING DIFFUSION BARRIER IN SUPERCONDUCTORS (VERSIONS) Russian patent published in 2006 - IPC C22F1/18 B21B3/00 

FIELD: metallurgy; production of superconducting wires operating at temperature of liquid helium in magnetic systems of charged-particle accelerators.

SUBSTANCE: proposed method includes homogenizing annealing of ingot within temperature interval of from 1200 to 1350°C and application of protective copper coat on ingot. Then, ingot is heated to temperature of 800-900°C and is subjected to extrusion deformation for obtaining first billet which is subjected to machining followed by application of protective copper coat. First billet is heated at temperature of 800-900°C and is subjected to extrusion deformation for obtaining second billet which is also subjected to machining. Then, the following operations are performed: re-crystallization annealing at temperature of from 950 to 1250°C, cold rolling to preset size of billet and re-crystallization annealing at temperature of from 950 to 1250°C. Billets thus produced possess property for further deformation at total drawing of up to 9·10⁸ for production of superconductors.

EFFECT: enhanced efficiency; avoidance of undesirable diffusion processes.

7 cl, 3 ex