US3868768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a composite superconductor
Assignee: BBC Brown Boveri AG Switzerland
•
Filing: 1973-05-22
•
Granted: 1975-03-04
•
Expires: 1993-05-22
Abstract
Abstract A method for producing electrical super-conductors consisting of a great number of mutually spaced thin filaments of a superconductive material in which diffusion is effected in mutually spaced zones between two adjoining metallic layers, one being vandium and the other a copper-gallium alloy by establishing similar mutually spaced zones in the layers in which the diffusion is either prevented or the superconductive properties of the inter-metallic compound formed by the diffusion is considerably reduced. In one mode of the method, mutuallly spaced zones of non-diffusion in the layers are established by use of mutually spaced zones of molybdenum or tantalum between the layers which prevent interdiffusion therebetween from taking place. In another mode of the method, mutually spaced zones of diminished super-conductive properties are established by use of mutually spaced zones of tin or aluminum which are caused to be diffused into the vanadium layer.
Inventors
- 👤 Gundolf Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:56
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; Y; Y02; Y02P; Y02P80/00; Y02P80/30; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/917; Y10S505/918; Y10S505/919; Y10S505/92; Y10S505/921; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
193 words
In the method for producing electrical super-conductors consisting of a great number of mutually spaced thin filaments of an intermetallic super-conductive compound by diffusion of a first metallic material from each of two outer layers of a threelayer metallic structure into a second metallic material of the intermediate layer therebetween, the improvements which comprise the steps of arranging at the interfaces between opposite faces of said intermediate layer and the adjoining faces of said two outer layers mutually spaced zones of a foreign substance extending in the longitudinal direction of the to be produced super-conductors, mechanically working the three-layer metallic structure as a unit to establish a metallurgically intimate connection between said layers, and subjecting the connected layers to a thermal treatment to effect the desired diffusion from said outer layers into said intermediate layer in mutually spaced longitudinally extending zones between mutually spaced longitudinally extending zones of said foreign substances said mutually spaced zones of said foreign substance functioning to prevent diffusion within said intermediate layer at its zones or to at least greatly reduce the superconductive properties of the intermetallic compound formed at its zones by diffusing into said intermediate layer.
Claim 2
Dependent Claim
193 words
In the method for producing electrical super-conductors consisting of a great number of mutually spaced thin filaments of an intermetallic super-conductive compound by diffusion of a first metallic material from each of two outer layers of a threelayer metallic structure into a second metallic material of the intermediate layer therebetween, the improvements which comprise the steps of arranging at the interfaces between opposite faces of said intermediate layer and the adjoining faces of said two outer layers mutually spaced zones of a foreign substance extending in the longitudinal direction of the to be produced super-conductors, mechanically working the three-layer metallic structure as a unit to establish a metallurgically intimate connection between said layers, and subjecting the connected layers to a thermal treatment to effect the desired diffusion from said outer layers into said intermediate layer in mutually spaced longitudinally extending zones between mutually spaced longitudinally extending zones of said foreign substances said mutually spaced zones of said foreign substance functioning to prevent diffusion within said intermediate layer at its zones or to at least greatly reduce the superconductive properties of the intermetallic compound formed at its zones by diffusing into said intermediate layer.
Claim 3
Dependent Claim
33 words
The method for producing electrical super-conductors as defined in claim 1 wherein said intermediate layer is constituted by vanadium and said two outer layers are constituted by an alloy of copper and gallium.
Claim 4
Dependent Claim
53 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance are established by mutually spaced tapes extending in the longitudinal direction of the super-conductors to be produced and from which the foreign substance is then diffused into said intermediate layer by thermal treatment.
Claim 5
Dependent Claim
44 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of said foreign substance extending in the longitudinal direction of the super-conductors to be produced lie exactly opposite to each othEr at opposite faces of said intermediate layer.
Claim 6
Dependent Claim
36 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance are established by coatings of the foreign substance on the opposite faces of said intermediate layer.
Claim 7
Dependent Claim
75 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance are established by coating the entire surfaces of the opposite faces of said intermediate layer with said foreign substance, effecting diffusion of the coated-on substance into said intermediate layer by application thereto of an electron beam along the desired mutually spaced zones, and then removing the non-diffused portions of the substance between the diffused-in zones.
Claim 8
Dependent Claim
48 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance are established by coating the entire surfaces of the opposite faces of said intermediate layer with said foreign substance and then removing the coating along mutually spaced zones.
Claim 9
Dependent Claim
62 words
The method for producing electrical super-conductors as defined in claim 1 and which includes the step of diffusing the mutually spaced zones of the foreign substance into said intermediate layer by thermal treatment in advance of a final heat treatment by which the diffusion from said outer layers into said intermediate layer is effected thereby to establish the mutually spaced super-conductive filaments.
Claim 10
Dependent Claim
62 words
The method for producing electrical super-conductors as defined in claim 1 and wherein the mutually spaced zones of the foreign substance are established by thermally induced diffusion of the foreign substance into said intermediate layer simultaneously with a final heat treatment by which diffusion from said outer layers into said intermediate layer is effected thereby to establish the mutually spaced super-conductive filaments.
Claim 11
Dependent Claim
38 words
The method for producing electrical super-conductors as defined in claim 1 wherein the width and distance apart between the mutually spaced zones of the foreign substance establishing non-super-conductor zones are equal to the thickness of said intermediate layer.
Claim 12
Dependent Claim
51 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance are established by wires or strips thereof inserted at the interfaces between said intermediate layer and said two outer layers and including the further step of compressing the whole by rolling.
Claim 13
Dependent Claim
57 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance between said intermediate layer and said two outer layers function to prevent diffusion of material from said two outer layers into said intermediate layer, said foreign substance being selected from the group consisting of molybdenum and tantalum.
Claim 14
Dependent Claim
66 words
The method for producing electrical super-conductors as defined in claim 1 wherein said mutually spaced zones of the foreign substance between said intermediate layer and said two outer layers diffuse into said intermediate layer thereby diminishing the super-conductive properties of the formed intermetallic compound at said zones at operating temperature of the super-conductors, said foreign substance being selected from the group consisting of aluminum and tin.
References Cited (Backward Citations)
US3408235A
Cited
US3665595A
Cited
US3730967A
Cited
US3778894A
Cited
US3763552A
Cited
US3737824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |