Powder metallurgy processed Nb3Al wires with low areal reduction ratios of R = 8xl03 to 1x10 4 have been investigated on superconducting properties. We have done the optimization of high field Jc values for Nb-8 wt.%Al with different areal reduction ratios. Tc was 17.1 K for the sample with a two stage heat treatment such as 1200 °C for 15 sec followed by 750 °C for 3 days in contrast to the Low T c values below 16 K for the samples with a single heat treatment at 800°C. B c2 for a two stage heat treated sample increased about 5 T at 4.2 K in comparison with a single heat, treated sample. The measured B c2 values were well fitted to the theoretical curve of the upper critical field. The overall J c values were measured up to 23 T at 4.2 K and Jc = 104 A/cm 2 at 17.5 T was achieved.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering