Patent US4196262A successfully refreshed from Google Patents.
US4196262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Al-Si-In/Ga alloy clad composite
Assignee: Rio Tinto Switzerland AG
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Filing: 1979-03-15
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Granted: 1980-04-01
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Expires: 1999-03-15
Abstract
Abstract An aluminum composite is provided having improved resistance to intergranular corrosion, especially a brazed aluminum composite. The composite comprises an aluminum base alloy core clad with a brazing alloy consisting essentially of from 4-14% silicon, from 0.01-2% of a material selected from the group consisting of indium, gallium and mixtures thereof, and the balance essentially aluminum. The additions to the brazing alloy reduce the tendency for the brazing alloy layer to induce intergranular corrosion of the core alloy layer. They also reduce the pitting rate of the brazing alloy layer.
Inventors
- 👤 Michael J. Pryor
- 👤 James M. Popplewell
- 👤 William H. Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:19
CPC Classifications
C; C23; C23C; C23C30/00; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; B32; B32B; B32B15/00; B32B15/01; B32B15/016; C22; C22C; C22C21/00; C22C21/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
45 words
An aluminum composite having improved resistance to intergranular corrosion comprising an aluminum base alloy core clad with a brazing alloy consisting essentially of from 4-14% silicon, 0.01-2% of a material selected from the group consisting of indium, gallium and mixtures thereof, and the balance aluminum.
Claim 2
Dependent Claim
45 words
An aluminum composite having improved resistance to intergranular corrosion comprising an aluminum base alloy core clad with a brazing alloy consisting essentially of from 4-14% silicon, 0.01-2% of a material selected from the group consisting of indium, gallium and mixtures thereof, and the balance aluminum.
Claim 3
Dependent Claim
8 words
A brazed aluminum composite according to claim 1.
Claim 4
Dependent Claim
11 words
A composite according to claim 1 wherein said cladding contains indium.
Claim 5
Dependent Claim
11 words
A composite according to claim 1 wherein said cladding contains gallium.
Claim 6
Dependent Claim
17 words
A composite according to claim 1 wherein said core is clad on both sides with said cladding.
Claim 7
Dependent Claim
52 words
A composite according to claim 1 wherein said core contains up to 2% manganese, up to 1% copper, up to 2% iron, up to 2% silicon, up to 1% zinc, up to 1% chromium, up to 2% magnesium, up to 0.2% titanium, and others each up to 0.05%, total up to 0.15%.
Claim 8
Dependent Claim
13 words
A composite according to claim 1 wherein said core is aluminum Alloy 3003.
Claim 9
Dependent Claim
13 words
A composite according to claim 1 wherein said cladding contains from 0.05-0.2% bismuth.
Claim 10
Dependent Claim
13 words
A composite according to claim 1 wherein said cladding contains from 0.5-3% magnesium.
Claim 11
Dependent Claim
35 words
A composite according to claim 1 wherein said cladding contains up to 1% iron, up to 0.5% copper, up to 0.5% manganese, up to 0.2% titanium, others up to 0.05% each, total up to 0.15%.
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) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |