A New Fabrication Process of Nb<SUB>3</SUB>Al Superconducting Wires Using Clad-Chips

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Nb3Al superconducting wires were successfully fabricated by a newly developed method, in which thin chips of Nb sandwiched by Al were used as a starting material. The fabrication process and the effects of several factors on the critical current density are presented. An optimized heat treatment yields Jc of ∼108 A/m2 at 4.2 K and 18.8T, Tc of 17 K and BC2* of 23.2T at 4.2 K. A further increase in Jc can be expected, since there is no evidence of saturation of it with increasing reduction ratio. This method having advantages of good workability, relatively low reduction ratio and simplicity of processing seems to be straightforward to the practical processing of the Nb3Al wire.