Patent US2825284A successfully refreshed from Google Patents.
Patent US3571907A successfully refreshed from Google Patents.
US3571907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cladding a metal surface
Assignee: Atomic Energy of Canada Ltd AECL
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Filing: 1967-03-08
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Granted: 1971-03-23
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Expires: 1987-03-08
Abstract
Abstract Aluminum cladding of zirconium alloy pressure tubes for nuclear reactors reduces the hydrogen pickup of the tubes. Cladding is achieved by heating in air both the aluminum and the alloy and stretch pressing, with sufficient pressure, the aluminum over the alloy. This technique appears to reduce the oxide layer on the aluminum to a sufficient concentration to permit bonding between the metals over 85 percent of the interface. Preferably the surface of the alloy is cleaned and polished immediately prior to heating.
Inventors
- 👤 Robert Douglas Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:02
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/001; B21; B21C; B21C1/00; B21C1/16; B21C1/22; B23K20/22; B23K20/233; B23K20/2333; G; G21; G21C; G21C1/00; G21C1/04; G21C1/06; G21C1/14; G21C1/16; G21C1/18; G21C1/20; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12743
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
A method according to claim 1, wherein said interfaces are cleaned before said zirconium alloy tube and said aluminum are heated.
Claim 2
Dependent Claim
21 words
A method according to claim 1, wherein said zirconium alloy tube and said aluminum are heated to at least 950* F.
Claim 3
Dependent Claim
27 words
A method according to claim 1, wherein said zirconium alloy tube and said aluminum are heated to substantially 1050* F. for 15 to 45 minutes in air.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |