Verfahren zur Herstellung eines ummantelten Drahtes aus einem keramischen Hochtemperatur-Supraleiter.

摘要

Production of a sheathed wire or multiple-filament conductor composed of ceramic high-temperature superconductor by mixing Y2O3, CuO and BaO2 or BaO2+BaO, loading the powder mixture (3) into the interior of a metal sheath (1) lined with Ag intermediate layer (2), slowly heating to a maximum permissible reaction/sintering temperature of 950 DEG C. in a period of at least 0.1 h, holding the sintering temperature for at least 1 h, cooling down to 200 DEG C. at at most 10 DEG to 100 DEG C./h to form a conducting core (4) composed of YBa2Cu3O6.5-7.5. Variants having a layer composed of CuO, diffusion barrier composed of Ni, Ta, Nb, V or having Ag intermediate layer doped with AgO or BaO2. Preferably reactive sintering under a pressure of 10 to 10.000 bar as hot isostatic pressing. Variant: reactive annealing of the powder mixture under oxygen pressure of 10 to 3000 bar at 600 DEG to 950 DEG C. Pulverizing of the body formed, loading into the metal sheath (1), fabrication, sintering to form a compact superconductor under an external pressure of 10 to 3000 bar at 500 DEG to 900 DEG C. Multiple-filament conductor with centrally arranged tracks of oxygen-releasing substances surrounded by peripheral superconductor tracks.