抄録
The commercial-scale development and critical current density (Jc) improvement of (Nb, Ta)3Sn superconducting wires utilizing a Ta-Sn powder-in-tube process were carried out. In the commercial-scale wire, the necessary properties (RRR, 0.2% yield strength) required for practicable use were equivalent to a wire developed using the bronze-method. The Jc and n-value were uniform along the wire and higher than those of the bronze-method wire. In addition, we achieved an overall Jc of 110 A/mm2 (21 T, 4.2 K) by optimizing the core composition of the wire and heat treatment.
