Patent US4078299A successfully refreshed from Google Patents.
US4078299A
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Method of manufacturing flexible superconducting composite compound wires
Assignee: Furukawa Electric Co Ltd
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Filing: 1976-04-13
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Granted: 1978-03-14
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Expires: 1996-04-13
Abstract
Abstract A superconducting compound wire which comprises a plurality of strands having superconducting compound therein, a part or all of the strands having inclination to the lengthwise direction of the superconducting wire, and the strands being not substantially together with each other.
Inventors
- 👤 Yoshio Furuto
- 👤 Takuya Suzuki
- 👤 Masaru Ikeda
- 👤 Yasuzo Tanaka
- 👤 Shinichiro Meguro
- 👤 Takeshi Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:49
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; H10N60/20; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/887; Y10S505/912; Y10S505/913; Y10S505/915; Y10S505/917; Y10S505/918; Y10S505/919; Y10S505/92; Y10S505/921; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
87 words
A method for manufacturing a superconducting compound wire which comprises assembling a plurality of strands in which a compound phase is to be formed by a heat treatment, in such a manner that at least some of the strands have an inclination to the lengthwise direction of the superconducting wire, heating the assembled strands at a temperature sufficient to form the compound in the presence of a substance laid between the strands which prevents mutual diffusion among adjacent strands during the heat treatment, and cooling the strands.
Claim 2
Independent Claim
87 words
A method for manufacturing a superconducting compound wire which comprises assembling a plurality of strands in which a compound phase is to be formed by a heat treatment, in such a manner that at least some of the strands have an inclination to the lengthwise direction of the superconducting wire, heating the assembled strands at a temperature sufficient to form the compound in the presence of a substance laid between the strands which prevents mutual diffusion among adjacent strands during the heat treatment, and cooling the strands.
Claim 3
Dependent Claim
42 words
A method according to claim 1, in which said substance is produced by subjecting the strand to a heat treatment in an oxidizing atmosphere to form an oxide film on the surface of each strand prior to the compound forming heat treatment.
Claim 4
Dependent Claim
80 words
A method according to claim 1 in which the composite metal strands have a first layer of niobium or vanadium closely adhering to the entire outside of a stabilizing material selected from the group consisting of copper, silver, aluminum and gold, and a second layer of elements or an alloy thereof which elements react with niobium or vanadium to form a superconducting compound, said second layer being closely adhering to the outside of the first layer of niobium or vanadium.
Claim 5
Dependent Claim
24 words
A method according to claim 3 in which further a plurality of filamentary cores of niobium or vanadium are embedded in the second layer.
Claim 6
Dependent Claim
104 words
A method according to claim 1 wherein the strand comprising at least a core in which a continuous phase of a superconducting compound is formed in the longitudinal axis of the strand at the heat treatment, a layer of a stabilizing material which encloses the core, and a layer of a metal which surrounds and is in direct contact with the entire surface of the stabilizing material and which forms in the interfaces between the stabilizing material and the metal a layer of an alloy or a compound having a high electrical resistance through a reaction with said stabilizing material during said heat treatment.
Claim 7
Dependent Claim
61 words
A method according to claim 1, in which the metal strands are made by putting bars of a metal having higher melting point than other metals composing the desired compound in a mold, then pouring melt of the other metals into the mold and rapidly cooling the mold and subjecting the composite stock thus obtained to mechanical working into a strand.
Claim 8
Dependent Claim
28 words
A method according to claim 6, in which an oxide film is formed previously on the surface of the bar of the metal having a higher melting point.
Claim 9
Dependent Claim
97 words
A method according to claim 1, in which the metal strands are made by providing a coating film of copper or silver on the outside of each of the bars of the metal having a higher melting point, putting the bars in a mold, pouring in the mold a melt of an alloy of copper or silver and a metal having a lower melting point, said metals having two different melting points composing the desired superconducting compound, cooling the melt to obtain a composite stock, and subjecting the composite stock to a mechanical working into a strand.
Claim 10
Dependent Claim
86 words
A method according to claim 1 in which the strands are made by providing a coating film of copper or silver on the outside of the bar of the metal having a higher melting point to obtain a composite bar by embedding the composite bar into an alloy billet of copper or silver and a metal having a lower melting point said metals having two different melting points composing the desired superconducting compound, and then subjecting the composite billet to a mechanical working into a strand.
Claim 11
Dependent Claim
30 words
A method according to claim 3, in which a continuous phase of a metal selected from the group consisting of niobium, vanadium and their alloys is in the stabilizing metal.
Claim 12
Dependent Claim
53 words
A method according to claim 1, in which the composite metal strand has a copper layer closely adhering to vanadium or vanadium alloy and a silver layer closely adhering to the copper layer, and at least one of the copper layer and the silver layer contains 0.1 to 30 atomic percent of gallium.
Claim 13
Dependent Claim
73 words
A method according to claim 1, in which the strands are assembled in such a manner that the outer diameter of the strand is smaller than the product of allowable bending diameter of the superconducting compound wire to be obtained and the strain limit beyond which the superconducting characteristics of the strands will be degraded and the standing pitch thereof is in the range of 20 to 1000 times the strand outer diameter.
Claim 14
Dependent Claim
20 words
A method according to claim 1, in which the assembled strands are drawn into a circular shape in cross section.
Claim 15
Dependent Claim
61 words
A method according to claim 1, in which the assembled strands are wound around a winding frame having on its surface a substance which does not react with the assembled strands during the subsequent heat treatment, in such a manner that the strands do not contact with each other, and then heated at a temperature sufficient to form the desired compound.
Claim 16
Dependent Claim
62 words
A method according to claim 14, in which the assembled strands are wound in a multiple layers around the frame, with spacers being inserted between turns and layers thereof, said spacers, each having on their surfaces a substance which does no reacter with the strand during the subsequent heat treatment, and then heated at a temperature sufficient to form the desired compound.
Claim 17
Dependent Claim
19 words
A method according to claim 15, in which the spacer is a carbon-coated wire or foil of mild steel.
Claim 18
Dependent Claim
20 words
A method to claim 15, in which the frame is made of a carbon-coated mild steel or an oxidized titanium.
Claim 19
Dependent Claim
38 words
A method according to claim 1, in which the cooling is conducted at a rate below the rate at which fine destruction of the compound will be caused due to thermal stress in the compound during the cooling.
Claim 20
Dependent Claim
42 words
A method according to claim 18, in which the cooling is conducted at a rate of 2° C/min. at highest down to the half of the compound forming temperature (absolute temperature) in case of strands of 0.5 mm or less in diameter.
Claim 21
Dependent Claim
42 words
A method according to claim 1, the superconducting wire after the cooling are passed through a molten bath of soft metal to coat at least the exposed surface of the outermost strands with the soft metal to obtain a stabilized superconducting wire.
Claim 22
Dependent Claim
22 words
A method according to claim 20, in which the soft metal is selected from the group consisting of indium, tin and lead.
Claim 23
Dependent Claim
32 words
A method according to claim 21, in which the wire is subjected to acid pickling in a solution containing fragments of indium before the wire is passed through the molten indium bath.
Claim 24
Dependent Claim
38 words
A method according to claim 21, in which a metal wire which is liable to be coated with indium is wound around the surface of the superconducting wire before the wire is passed through the molten indium bath.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |