US4052784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a tubular conductor suitable for superconducting cables
Assignee: Siemens AG
•
Filing: 1974-02-26
•
Granted: 1977-10-11
•
Expires: 1994-02-26
Abstract
Abstract An improved method of manufacturing a tubular conductor which consist of a niobium layer and a copper layer, in which one side of a tube of electrolytic copper is plated with niobium by fusion electrolysis and the tube section thus produced, then drawn in several cold drawing passes to reduce the outside diameter and the wall thickness of the tube to form a longer tube, resulting in simplified production of seamless tubes, particularly useful in superconducting cables and having good mechanical, thermal and electrical contact between the niobium and copper layers.
Inventors
- 👤 Heinrich Diepers
- 👤 Otto Schmidt
- 👤 Horst Musebeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:27
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0156; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/917; Y10S505/928; Y10S505/93; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
95 words
A method for manufacturing a tubular conductor consisting of a niobium layer and a copper layer, which conductor is particularly suited for a superconducting cable, comprising the steps of: a. plating one cylindrical surface of a seamless tube of electrolytic copper with a layer of niobium by fusion electrolysis; b. applying a lubricating coating to the niobium layer and copper surface; c. drawing the tube so formed in several cold drawing passes to reduce the outside diameter and the wall thickness of the tube and the niobium layer in order to form a longer tube.
Claim 2
Independent Claim
95 words
A method for manufacturing a tubular conductor consisting of a niobium layer and a copper layer, which conductor is particularly suited for a superconducting cable, comprising the steps of: a. plating one cylindrical surface of a seamless tube of electrolytic copper with a layer of niobium by fusion electrolysis; b. applying a lubricating coating to the niobium layer and copper surface; c. drawing the tube so formed in several cold drawing passes to reduce the outside diameter and the wall thickness of the tube and the niobium layer in order to form a longer tube.
Claim 3
Dependent Claim
23 words
The method according to claim 1 in which the wall thickness of the tube is reduced by no more than 20% per pass.
Claim 4
Dependent Claim
20 words
The method according to claim 2 wherein the wall thickness of the tube is reduced by approximately 10% per pass.
Claim 5
Dependent Claim
27 words
The method according to claim 1 and further including the step of smoothing the niobium layer by a turning operation prior to the coating and drawing steps.
Claim 6
Dependent Claim
27 words
The method according to claim 3 and further including the step of smoothing the niobium layer by a turning operation prior to the coating and drawing steps.
Claim 7
Dependent Claim
22 words
The method according to claim 1 wherein drawing oil is used as the lubricant coating on the copper side of the tube.
Claim 8
Dependent Claim
22 words
The method according to claim 3 wherein drawing oil is used as the lubricant coating on the copper side of the tube.
Claim 9
Dependent Claim
24 words
The method according to claim 1 wherein a layer of lacquer is applied to the niobium side of the tube as a lubricant coating.
Claim 10
Dependent Claim
15 words
The method according to claim 8 wherein said lacquer is a fast drying nitrocellulose lacquer.
Claim 11
Dependent Claim
15 words
The method according to claim 9 wherein said fast drying nitrocellulose lacquer is zapon varnish.
Claim 12
Dependent Claim
28 words
The method according to claim 1 and further including a step of forming a niobium pentoxide layer on the niobium side of the tube as a lubricant coating.
Claim 13
Dependent Claim
28 words
The method according to claim 6 and further including a step of forming a niobium pentoxide layer on the niobium side of the tube as a lubricant coating.
Claim 14
Dependent Claim
28 words
The method according to claim 1 and further including the step of applying a soapy lubricant to the niobium side of the tube prior to the drawing step.
Claim 15
Dependent Claim
28 words
The method according to claim 6 and further including the step of applying a soapy lubricant to the niobium side of the tube prior to the drawing step.
Claim 16
Dependent Claim
13 words
The method according to claim 14 wherein said soapy lubricant is zinc stearate.
Claim 17
Dependent Claim
15 words
The method according to claim 1 wherein said tube is drawn over a round mandrel.
Claim 18
Dependent Claim
18 words
The method according to claim 1 wherein the niobium layer forms the outer cylindrical surface of the tube.
Claim 19
Dependent Claim
34 words
The method according to claim 16 wherein the niobium layer forms the inner cylindrical surface of the tube and drawing oil is provided as a lubricant coating between the mandrel and the niobium layer.
Claim 20
Dependent Claim
18 words
The method according to claim 6 wherein the niobium layer forms the outer cylindrical surface of the tube.
Claim 21
Dependent Claim
43 words
A method according to claim 6 wherein said tube is drawn over a round mandrel and the niobium layer forms the inner cylindrical surface of the tube and drawing oil is provided as a lubricant coating between the mandrel and the niobium layer.
References Cited (Backward Citations)
US1072478A
Cited
DE573902C
Cited
US2268617A
Cited
US3353387A
Cited
US3342648A
Cited
US3350907A
Cited
US3623221A
Cited
US3580019A
Cited
US3655349A
Cited
US3644987A
Cited
US3775840A
Cited
US3777368A
Cited
US3783503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |