Fremstilling av en supraledende flerleder i sölvbasismatrise

In a multi-filament high temperature superconductor (HTSC) wire, each filament comprises a HTSC ceramic core (11) enclosed by a first Ag alloy sheath (12) which, in turn, is surrounded by an oxygen-permeable non-superconductive ceramic layer (13) enclosed by a second Ag alloy sheath (14). Also claimed is a process for producing the above wire, involving filling a silver-based sleeve with HTSC precursor powders, drawing to a monofilament wire, cutting the wire into lengths, filling a second silver-based sleeve with the cut lengths, drawing the resulting multi-filament billet to a multi-filament wire, repeating the above cutting and drawing steps at least once and then shaping and heat treating the multi-filament wire. The novelty comprises: (a) preparing a multilayer composite material consisting of one or more silver-based foils and one or more oxygen-permeable non-superconductive ceramic layers; and (b) interposing the multilayer material between first and second silver-based l ayers to form the first silver-based sheath used to produce the monofilament wire.