| 摘要 |
1008132 Super-conductive devices; electric conductors W C HEREAUS GmbH 5 March 1964 [6 March 1963] 9395/64 Headings H1A and A4D To impart a filamentary structure to a wire made from a super-conductive intermetallic compound, one of the constituents of the compound is formed into a tube into which is placed a bundle of wires, preferably of the same material, and a second constituent of the compound is then introduced, in molten state, to fill the interstices between the wires and the tube. The tube is then drawn and shaped, e.g. into a coil, before a final heat-treatment to combine the constituents. A particular example describes a wire of the compound Nb 3 Sn produced by tin plating the interior of a niobium tube, inserting a bundle of tin-plated niobium wires, introducing molten tin into the tube under vacuum, cold drawing the resulting wire by stages down to a required diameter, forming a coil from the drawn wire, and then heating for several hours at 900‹ to 1200‹C. The possibility of a three-element intermetallic compound being used is mentioned, and the following alternative two-element compounds are specified: Nb 3 Al; Nb 3 In; Nb 3 Ga; V 3 Si; V3 Ga; V 3 Sn; Ta 3 Sn. |
