Effects of Heat Treatments on the Nb3Sn Composite Strands
Nb3Sn superconductors are widely used in high magnetic field application. Internal tin processed Nb3Sn wires used for ITER coils (at 4.2K, 12T) were heated by two steps, local heat treatment and reaction heat treatments. The superconducting properties of Nb3Sn were investigated as a function of reaction heat treatment (HT) for strands during 625°C~665°C.To study the heat treatment effects on Jcn and n-value of Nb3Sn strands, different HT-parameters, i.e., annealing temperature and times, were applied on the Nb3Sn multifilament strands.
Yafang Han et al.
M. Liang et al., "Effects of Heat Treatments on the Nb3Sn Composite Strands", Materials Science Forum, Vols. 546-549, pp. 2023-2026, 2007