Speaker
Mr
Qingxiang Wang
(technic)
Description
In this study, NbTi superconducting wire was prepared with high pure Cu10% Ni alloy as the matrix material usingthe methods of assembling for three times. The ratio of copper to superconductor was 1.8 and the final size of the wire was 0.7 ± 0.005 mm, with 7225 filaments. Optical microscopy (OM), scanning electron microscopy (FESEM), line energy spectrum analysis (EDS) and transmission electron microscopy (TEM) were observed on its cross-section, microstructure and filament surface. Moreover, a low-temperature test system was used to measure the critical current Ic and n values (@ 4.2 K, 3.0, 4.0, 5.0, 6.0 T) for samples with different aging processes. The residual resistance ratio value (RRR) was also measured. Test results show that the NbTi average filament diameter for the Φ0.7 mm wire is 4.9 μm. The filament deformation was uniform and the surface was smooth without CuTi compounds. The critical current test results showed that after three aging and eventually wire strain of 4.0 for the Φ0.7 mm wire at 5 T, the critical current was 286 A (@4.2k,5T) and the critical current density was 2087 A/mm2. The n value was about 15.6, while the RRR was 105. The wire had a low hysteresis loss, which was 22 mJ/cm3 (@ 4.2 K, ± 3.0T).
Author
Mr
Qingxiang Wang
(technic)
Co-author
Ms
Yanmin Zhu
(Technics)
