US3890700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a composite wire with an aluminum core and niobium cladding
Assignee: Siemens AG
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Filing: 1973-07-12
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Granted: 1975-06-24
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Expires: 1993-07-12
Abstract
Abstract A method for manufacturing a composite wire having an aluminum core and niobium cladding surrounding the core in which a starting structure comprising a rod-shaped aluminum core and a niobium jacket enclosing the core is assembled with a drawing aid surrounding the niobium jacket and then reduced in cross section by repetitive cold-drawing until a solid bond between the niobium and the aluminum is obtained. After removing the drawing aid, the composite structure so formed is then subjected to a surfacesmoothing cold-forming process.
Inventors
- 👤 Heinrich Diepers
- 👤 Horst Musebeck
- 👤 Eduard Wirkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:51
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/04; B21C37/042; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K20/2333; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0128; 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: 12
Claim 1
Independent Claim
99 words
A LOW TEMPERATURE METHOD FOR MANUFACTURING A COMPOSITE WIRE HAVING AN ALUMINUM CORE CLAD WITH NIOBIUM WTHOUT SUBJECTING THE COMPOSITE WIRE TO ANY TEMPERATURE ABOVE ABOUT 100*C., SAID METHOD COMPRISING THE STEPS OF A. FORMING AN ALUMINUM ROD; B. COVERING SAID ROD WITH A NIOBIUM JACKET TO FORM A STRATING STRUCTURE; C. APPLYING A DRAWING AID TO THE OUTSIDE OF SAID JACKET; D. REPETITIVEELY COLD-DRAWING THE STARTING STRUCTURE UNTIL A INTIMATE MECHANICAL BOND BETWEEN THE ALUMINUM AND NIOBIUM IS ACHIEVED; E. REMOVING SAID DRAWING AID FROM SAID JACKET; AND F. SUBJECTING THE RESULTING STRUCTURE TO A SURFACE-SMOOTHING COLD-FORMING PROCESS.
Claim 2
Dependent Claim
99 words
A LOW TEMPERATURE METHOD FOR MANUFACTURING A COMPOSITE WIRE HAVING AN ALUMINUM CORE CLAD WITH NIOBIUM WTHOUT SUBJECTING THE COMPOSITE WIRE TO ANY TEMPERATURE ABOVE ABOUT 100*C., SAID METHOD COMPRISING THE STEPS OF A. FORMING AN ALUMINUM ROD; B. COVERING SAID ROD WITH A NIOBIUM JACKET TO FORM A STRATING STRUCTURE; C. APPLYING A DRAWING AID TO THE OUTSIDE OF SAID JACKET; D. REPETITIVEELY COLD-DRAWING THE STARTING STRUCTURE UNTIL A INTIMATE MECHANICAL BOND BETWEEN THE ALUMINUM AND NIOBIUM IS ACHIEVED; E. REMOVING SAID DRAWING AID FROM SAID JACKET; AND F. SUBJECTING THE RESULTING STRUCTURE TO A SURFACE-SMOOTHING COLD-FORMING PROCESS.
Claim 3
Dependent Claim
27 words
The method according to claim 1 wherein the starting structure is formed by pushing a round aluminum rod into a niobium tube with a matching inside diameter.
Claim 4
Dependent Claim
14 words
The method according to claim 2, wherein said smoothing cold forming process comprises round-swaging.
Claim 5
Dependent Claim
25 words
The method according to claim 3, wherein the composite structure is rotated about its longitudinal axis relative to the swaging jaws during the round swaging.
Claim 6
Dependent Claim
33 words
The method according to claim 3 wherein the composite structure, after the intimate mechanical bond between the niobium and the aluminum is established, is subjected to further cold-working steps before said round swaging.
Claim 7
Dependent Claim
31 words
The method according to claim 1, wherein the starting structure is cold-drawn down to a reduction of the starting cross section, as measured over the niobium jacket, of at least 20%.
Claim 8
Dependent Claim
20 words
The method according to claim 1 wherein a copper tube surrounding the niobium jacket is used as a drawing aid.
Claim 9
Dependent Claim
25 words
The method according to claim 1 wherein a lubricating varnish layer of quick-drying nitrocellulose varnish is applied to the niobium jacket as a drawing aid.
Claim 10
Dependent Claim
24 words
The method according to claim 1 wherein a niobium pentoxide layer is formed on the surface of the niobium jacket as a drawing aid.
Claim 11
Dependent Claim
20 words
The method according to claim 1 wherein the surfaces of the components of the starting structure are etched before assembly.
Claim 12
Dependent Claim
29 words
The method according to claim 1 and further including the step of briefly heating the composite wire to a temperature in the range of 50*to 100*C after round swaging.
References Cited (Backward Citations)
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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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |