A process for the manufacture of intrinsically multifilament A-15 superconductors and superconductors obtained with such process

摘要

The process serves to obtain A-15 superconductors of the general formula A3B and envisages a plurality of strips (4) being "sandwiched" between two sheets (2) of material A, the strips being disposed parallel to one another and spaced with a predetermined separation transversely of the strips (2), connecting the three layer composite A/B/A to a layer (15) of copper and then winding the multi-layer sheet A/B/A/Cu thus obtained around an element (10) of copper and introducing the coil (11) thus obtained into a copper container (12) and plastically working the blank (13) thus obtained to form a conductor which is twisted and then subjected to a heat treatment for diffusion at a temperature such as to prevent the formation of liquid phase, until the compound A3B is obtained by interdiffusion. The material A is Nb or V or an alloy containing these and the material B is Al, Sn, Ge, Ga, Si, or an alloy containing one or more of these elements.