Method of manufacturing a niobium-aluminum-germanium superconductive material
Apparatus for the manufacture of mineral insulated cables
Cored tubular electrode and method for the electric-arc cutting of metals Patent #: 4721837
ApplicationNo. 737572 filed on 07/26/1991
US Classes:505/433, With metal deforming, metal wrapping, or metal coiling29/33D, Tube making29/33F, Wire working29/599, Superconductor174/125.1, Superconductors427/62, Superconductor505/704Wire, fiber, or cable
ExaminersPrimary: King, Roy V.
Foreign Application Priority Data1987-03-31 JP
AbstractThe present invention relates to a method of producing a superconducting composite wire. The method comprises forming a continuously supplied metal or metal alloy strip into a flume-shaped strip. A ceramic copper oxide superconducting powder material is filled in the interior of the flume-shaped strip. The flume-shaped strip is rolled such that a first edge of the strip approaches a second edge of the strip to form a tubing having a gap between the first and second edges and also having the powder material enveloped therein. The gap allows free access of oxygen to the powder material during a subsequent sintering step. The powder material is then sintered at a temperature of between 0 and 100° C. less than the lowest melting point of any constituent of the material. The strip enveloping the sintered material is then deformed to a reduced cross-section and subjected to a heat treatment.