Abstract
The route that combines with the mechanically alloying (MA) and powder-in-tube (PIT) method is thought as a potential way to make cost-friendly Nb3Al superconducting wire, since the MA could produce the high-quality Nb(Al)ss supersaturated solid solution and thus obtain high-Jc Nb3Al superconductor. In order to know the effect of hot-pressure (HP) sintering on superconducting properties and flux pinning of Nb3Al, a series of Nb3Al superconducting bulks annealed at 950 °C for 3 h with different sintering pressure and ball milling time have been prepared in this work. The results suggest that for the mechanically alloyed Nb3Al superconductor, its critical current density (Jc) and superconducting transition temperature (Tc) can be significantly improved by HP sintering. Comparing with the atmosphere pressure (AP) sintering, the Tc, onset and Jc (8 K, 7 T) of HP Nb3Al sample with a milling time of 2 h increase from 15.1 K and 0.56 × 104 A/cm2 to 15.7 K and 6.03 × 104 A/cm2, respectively. Improvement of grain connectivity and flux pinning properties are thought to be mainly responsible to the enhancement of current-carrying ability of HP Nb3Al superconductor.
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