Fremgangsmåde til fremstilling af et viklet legeme, der indeholder Nb3Sn.

摘要

A method of manufacturing a wound Nb3Sn containing body comprises the steps of producing an insulating oxidized niobium foil by heating the foil from 3 to 60 microns thick in an oxidizing atmosphere at 625 DEG C. to 850 DEG C., winding a combination comprising a niobium conductor and the insulating oxidized niobium foil so as to form a wound body, and then subjecting the wound body to a thermal treatment at 920 DEG C. to 1200 DEG C., during which treatment Nb3Sn is formed by alloying tin with the niobium conductor. In one embodiment the thermal treatment is carried out in a bath of molten tin or altenatively a tin coated niobium conductor may be used as a source of the tin. Two tapes of niobium foil separated by a tape of oxidized niobium foil were wound on a first split cylinder of Nb3Sn. The wound coil was surrounded on the outside by a second split cylinder of Nb3Sn and the body was immersed in molten tin. After cooling 1 mm. thick wafers were cut from the coil and placed in liquid helium so that the Nb3Sn was superconductive. According to the Figure the cylindrical Nb3Sn cone 1 is shown with a few of the windings consisting of a spiral 2 of oxidized niobium foil and a spiral 3 of Nb3Sn.