Method of manucfacturing oxide superconducting wire
A technology of superconducting wires and oxides, applied in cable/conductor manufacturing, superconducting devices, superconducting/high-conducting conductors, etc. Wire and other issues to achieve the effect of improving superconductivity and density
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no. 1 example
[0038] FIG. 1 is a partial sectional perspective view schematically showing the structure of an oxide superconducting wire. For example, referring to FIG. 1 , a multi-core oxide superconducting wire is described. An oxide superconducting wire 1 has a plurality of oxide superconductor cores 2 extending longitudinally and a sheath portion 3 covering the superconductor cores. The material of each of the plurality of oxide superconductor cores 2 preferably has a Bi-Pb-Sr-Ca-Cu-O-based composition, for example, including a Bi2223 phase (wherein the atomic ratio: (bismuth and lead): strontium: Calcium:copper (essentially 2:2:2:3) materials are especially optimized. The material of the shield portion 3 is made of metal such as silver or silver alloy.
[0039] When the multi-core wire is explained as described above, an oxide superconductor wire of a single-core wire structure comprising a single oxide superconductor core 2 covered with a sheath portion 3 can be selectively employed. ...
no. 2 example
[0055] 5 is a block diagram showing manufacturing steps of an oxide superconducting wire according to a second embodiment of the present invention. Referring to Fig. 5, the wire rod is rolled (primary rolling: step S5), the wire rod is heat-treated in a pressurized atmosphere (the first heat treatment: step S6), and then the wire rod is rolled again (secondary rolling: step S7 ). The current stretch ratio is not particularly limited. Therefore, the cavities formed by the first heat treatment are removed by performing the second rolling.
[0056] Then, the wire rod is subjected to heat treatment at a temperature of, for example, 820° C. (secondary heat treatment: step S8 ). At this time, the wire rod, preferably the wire rod heat-treated in pressurized atmosphere, may be heat-treated under atmospheric pressure. In the second heat treatment, the oxide superconducting phase is converted into a single phase simultaneously with the progress of sintering of the oxide superconduct...
no. 3 example
[0061] FIG. 6 is a block diagram showing a method of rolling a wire rod in a third embodiment of the present invention. Fig. 6 is a cross-sectional view perpendicular to the longitudinal direction of the wire. Referring to FIG. 6, the wire 1a is rolled while the side surface 18 of the wire is fixed with each fixing member 17 in the rolling (step S5). The side surfaces 18 of the wire 1a represent the faces of the wire 1a that are substantially perpendicular to the upper 19 and lower 20 surfaces when they are pressed by the rollers 15 ( FIG. 3 ).
[0062] Other methods of manufacturing the oxide superconducting wire are similar to the manufacturing methods according to the first embodiment shown in FIG. 2 or the second embodiment shown in FIG. 5 , and will not be repeated here.
[0063] In the method of manufacturing an oxide superconducting wire rod according to this embodiment, the wire rod 1a is rolled while its side surface 18 is fixed in the rolling (step S5). Therefore, ...
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Abstract
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