摘要:
A method of manufacturing a fine multifilamentary Nb-Ti based superconducting wire was disclosed, which comprises a first step of processing an alloy consisting essentially of 10 to 50 atomic % of niobium, 40 to 75 atomic % of titanium and no higher than 30 atomic % of least one element selected from a group consisting of hafnium, tantalum and tungsten to form an alloy wire, a second step of covering said alloy wire with a stabilizer, cold drawing the resultant wire, bundling a plurality of a stabilizer-clad wires thus obtained, covering the bundle of wires with a stabilizer, and extruding and cold drawing the resultant bundled wire to thereby form a multifilamentary wire, and a third step of thermally treating the resultant multifilamentary wire at a temperature of 250 to 600°C and drawing the resultant treated multifilamentary wire to a reduction rate of 30 to 99.9 %. The third step is carried out more than once.
摘要:
A method of extruding a billet (18) to produce a superconductor rod includes the steps of applying a force to a composite billet (18) away from a cross-sectional center of the composite billet (18) so that the composite billet (18) presses against the extrusion orifice means and causes an upset flow of the central portion of the composite billet (18) in to be in a direction opposite that of the applied force.
摘要:
A submicron-particle ductile superconductor and method of fabricating the same wherein the submicron particles (e.g., 300 Angstroms) of a superconductor (e.g., NbC) are encapsulated in a metal tube (e.g., copper) and then fabricated down to fine wire in the absence of sintering of reaction annealing. Because of the fluid-like properties of the unsintered submicron-particle powdered core, the composite fabricated wire retains ductility and resistance to fracture while exhibiting superconducting properties approaching those of the bulk material in the core. Multifilamentary composites are obtained by bundling and fabricating the bundle down in a required number of steps.
摘要:
The invention relates to a method for producing a superconductor billet, in which superconductor billet there are used superconductor rods with a circular cross-section, and which superconductor billet can be extruded into a superconductor in a single-step extrusion process. According to the invention, the superconductor billet (12) is formed of interconnected blocks (1), into which blocks there are packed monofilament superconductor rods (5) with a circular cross-section.
摘要:
Un composant (10) servant à fabriquer un fil supraconducteur A15 de Nb3Sn présente une coupe transversale pleine après que l'on en ait enlevé des additions temporaires (6, 7). Il se compose d'une colonne centrale (1) d'aluminium (plus tard remplacé par de l'étain) entourée par un agencement de colonnes de cuivre polygonales (2, 2a) en une profondeur de deux colonnes contenant des tiges de niobium. Plusieurs (par exemple 61) composants (10) sont empilés ensemble sans laisser de vides, et extrudés. Les tiges de niobium adoptent et retiennent une distribution uniforme avec un minimum de matériau intercalaire. Cet élément composé de 61 composants retient sa forme au cours de l'extrusion et présente lui-même une coupe transversale pleine. Plusieurs de ces éléments sont empilés sans laisser de vides et, lors du traitement thermique de l'ensemble, l'étain se diffuse sur une distance relativement courte et de manière consistante dans les tiges, ce qui permet de produire un fil de Nb3Sn d'un kilofilament.
摘要:
A process for producing a superconductor wire made up of a large number of round monofilament rods is provided for, comprising assembling a multiplicity of round monofilaments inside each of a multiplicity of thin wall hexagonal tubes and then assembling a number of said thin wall hexagonal tubes within an extrusion can and subsequently consolidating, extruding and drawing the entire assembly down to the desired wire size.