MANUFACTURE OF NB-TI SUPERCONDUCTING MULTI-LAYER PLATE

摘要

PROBLEM TO BE SOLVED: To obtain a superconducting multi-layer plate by depositing one or more layers formed by coating normal conductive metal material around a single layer of Nb-Ti alloy material covered by a sheet of Nb, Ta or the like, then after a heat process with a particular process rate and at a particular temperature, performing another heat process at a particular temperature and for a particular period, and repeating the cooling process at a particular process rate. ;SOLUTION: A single layer of Nb-Ti alloy material 1 covered with a sheet of Nb, Ta or the like, is inserted into a case 2 of normal conductive metal material, and the case 2 is weld-sealed, to obtain an Nb-Ti single-layer clad slab 4. The slab 4 is subjected to a surface reducing process including a heat process with a process rate of 30-98% and at 500-1000°C for composite integration. Further, the slab 4 is subjected to another process with a process rate of 30-98% and at 600°C or lower. Thereafter, a heat process at 300-450°C and with a holding period of 1-168 hours and a cooling process with a process rate of 30-98% are alternately repeated 6 times or less, to form an Nb-Ti superconducting multi-layer plate.;COPYRIGHT: (C)1997,JPO