摘要:
A niobium-based superconductor is manufactured by establishing multiple niobium components (4) in a billet of a ductile metal, working the composite billet through a series of reduction steps to form the niobium components into elongated elements, each niobium element having a thickness on the order of 1 to 25 microns, surrounding the billet prior to the last reduction step with a porous confining layer of an acid resistant metal (7), immersing the confined billet in an acid or a high temperature liquid metal to remove the ductile metal from between the niobium elements while the niobium elements remain confined by said porous layer, exposing the confined mass of niobium elements to a material capable of reacting with Nb to form a superconductor.
摘要:
An Nb 3 Sn wire rod having a high J c value is manufactured using an Ag-Sn alloy. A composite rod including a plurality of Nb core materials incorporated in an Ag-Sn alloy matrix material having an Sn concentration of 9.35 to 22.85 at% is prepared. Next, the composite rod is extruded and/or wire drawn while carrying out process annealing of 350 to 490°C, followed by heat treatment at 500 to 900°C to produce an Nb 3 Sn filament. Thus, an Nb 3 Sn extrafine multi-core superconducting wire is manufactured.
摘要:
An oxide superconducting wire on which an insulating coat can be formed without sacrifice in superconducting characteristics, the wire comprising oxide superconducting filaments (1), a matrix material (2), a covering film (3) and an insulating coat (4), wherein the matrix material (2) made of silver is disposed to surround the filaments (1), the covering film (3) containing silver and manganese is disposed to surround the matrix material (2) and is at least 10 νm and up to 50 νm in film thickness, and the insulating coat (4) is disposed to surround the covering film (3).
摘要:
A method of producing a material of an oxide superconductor comprises the following steps: (a) in a solution, ionizing a material containing an atom for constituting the oxide superconductor, (b) by removing a solvent by spraying the solution in a first atmosphere, producing a material powder containing the atom for constituting the oxide superconductor, and (c) cooling the material powder in a second atmosphere into which a cooling gas is introduced. In this method, the concentration of carbon dioxide in the second atmosphere is lower than that in the first atmosphere, which contains the removed solvent component. The concentration of nitrogen oxide in the second atmosphere is lower than that in the first atmosphere, which contains the removed solvent component. The concentration of water vapor in the second atmosphere is lower than that in the first atmosphere, which contains the removed solvent component. These specifications enable the method to increase the density and purity of the oxide superconductor.
摘要:
Superconducting coils and methods of manufacture include a superconductor tape wound concentrically about and disposed along an axis of the coil to define an opening having a dimension which gradually decreases, in the direction along the axis, from a first end to a second end of the coil. Each turn of the superconductor tape has a broad surface maintained substantially parallel to the axis of the coil.
摘要:
A method for producing an aluminum-stabilized super conductive wire comprising covering the whole or part of the outer surface of a superconductive wire (11) constituted of a cupper or cupper-alloy matrix and superconductive filaments embedded in the matrix with a stabilizing material (13) made of a precipitation aluminum alloy by hot extrusion. The precipitation aluminum alloy is an Al-Ni alloy containing 100 to 25,000 ppm of nickel. Before the hot extrusion covering step, the stabilizing material (13) of the precipitation aluminum alloy is subjected to an aging heat treatment at 250° to 500 °C for more than 10 minutes.
摘要:
A superfine multi-core Nb 3 Al superconductive wire is produced by getting a Nb 3 Al superconductive wire ready which was obtained by subjecting a precursor wire having a superfine multi-core structure in which a plurality of Nb/Al complex cores are embedded in Nb, Ta, a Nb based dilute alloy, or a Ta based dilute alloy as the matrix to a rapid heating and quenching treatment comprising rapidly heating to a temperature range near 2,000 °C in 2 seconds,
(A) coating the Nb 3 Al superconductive wire with Cu or Ag as the stabilizing material; then (B) subjecting to a hot isostatic press (HIP) process for 10 minutes or more in a inert gas environment with a pressure of 40 atmospheres or more; and then (C) subjecting heat treatment for 1-200 hours in temperature range of 680-850 °C, to thereby obtain a method for producing Nb 3 Al superconductive wire and the Nb 3 Al superconductive wire obtained from said method in which: the cost is comparatively low; the wire may be produced to be either round or flat; and the superconductive characteristics is more stabilized.
摘要:
The invention relates to a method of producing a sheath for a high-temperature multifilament superconducting cable. According to the invention, the sheath is obtained through the co-extrusion of a cylindrical billet (50) comprising at least two concentric cylinders (52, 54, 56). The invention also relates to a sheath for a high-temperature multifilament superconducting cable which is produced using the aforementioned method. The inventive sheath consists of a tube (10) with a multi-layer wall comprising: a pure silver inner layer (12, 16, 22) and at least one second silver-based alloy layer (14, 18, 24, 26).
摘要:
The invention concerns a supraconductive conductor (10) comprising at least a supraconductive core (11) and an aluminium-based cryogenic stabiliser (12) characterised in that it the stabiliser (12) consists, entirely or partly, of a high-purity aluminium alloy, called Al-Fe-Ni, comprising: 200 ppm ≤ Fe + Ni ≤ 1500 ppm; 0.20 ≤ Fe/ (Fe + Ni) ≤ 0.65; optionally B