Patent US4039298A successfully refreshed from Google Patents.
US4039298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum brazed composite
Assignee: Rio Tinto Switzerland AG
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Filing: 1976-07-29
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Granted: 1977-08-02
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Expires: 1996-07-29
Abstract
Abstract Brazed aluminum composite having improved resistance to intergranular corrosion. The core alloy consists essentially of from 1 to 1.5% manganese, from 0.1 to 0.4% chromium, from 0.1 to 0.4% copper, from 0.01 to 0.6% silicon, from 0.01 to 0.7% iron, balance essentially aluminum. The cladding brazing alloy consists essentially of from 4 to 14% silicon, from 0.05 to 0.2% bismuth and the balance essentially aluminum. The brazed alloy composite provides galvanic protection against intergranular corrosion.
Inventors
- 👤 William H. Anthony
- 👤 James M. Popplewell
- 👤 Andrew J. Brock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:13
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/089; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; C23F13/08; C23F13/12; C23F13/14; F28F19/00; F28F21/081; F28F21/084; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/1216
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A brazed aluminum composite having improved resistance to intergranular corrosion comprising a substantially magnesium free aluminum alloy core material consisting essentially of from 1 to 1.5% manganese, from 0.1 to 0.4% chromium, from 0.1 to 0.4% copper, from 0.01 to 0.6% silicon, from 0.01 to 0.7% iron, balance essentially aluminum, wherein the microstructure is characterized by a solid solution containing manganese, copper and chromium, an alpha phase particulate dispersion uniformly dispersed throughout the matrix containing manganese and iron, and particles of MnAl 6 uniformly dispersed throughout the matrix, clad with a brazing alloy consisting essentially of from 0.05 to 0.2% bismuth, from 4 to 14% silicon and the balance essentially aluminum, wherein said composite provides galvanic protection against intergranular corrosion and wherein said cladding cathodically protects the core over a temperature range from ambient to 70° C.
Claim 2
Dependent Claim
137 words
A brazed aluminum composite having improved resistance to intergranular corrosion comprising a substantially magnesium free aluminum alloy core material consisting essentially of from 1 to 1.5% manganese, from 0.1 to 0.4% chromium, from 0.1 to 0.4% copper, from 0.01 to 0.6% silicon, from 0.01 to 0.7% iron, balance essentially aluminum, wherein the microstructure is characterized by a solid solution containing manganese, copper and chromium, an alpha phase particulate dispersion uniformly dispersed throughout the matrix containing manganese and iron, and particles of MnAl 6 uniformly dispersed throughout the matrix, clad with a brazing alloy consisting essentially of from 0.05 to 0.2% bismuth, from 4 to 14% silicon and the balance essentially aluminum, wherein said composite provides galvanic protection against intergranular corrosion and wherein said cladding cathodically protects the core over a temperature range from ambient to 70° C.
Claim 3
Dependent Claim
20 words
A composite according to claim 1 wherein said alpha phase particulate dispersion contains substantially comparable concentrations of manganese and iron.
Claim 4
Dependent Claim
57 words
A composite according to claim 1 wherein said core contains up to 0.5% zinc, up to 0.1% titanium, others up to 0.05% each, total up to 0.15%, and wherein said cladding contains up to 0.8% iron, up to 0.5% copper, up to 0.3% manganese, up to 0.1% titanium, others up to 0.05% each, total up to 0.15%.
Claim 5
Dependent Claim
15 words
A composite according to claim 1 wherein said cladding contains from 0.5 to 3% magnesium.
Claim 6
Dependent Claim
18 words
A brazed aluminum composite according to claim 1 wherein said cladding is on both sides of said core.
Claim 7
Dependent Claim
28 words
A composite according to claim 1 wherein said sheet has a thickness of from 0.001 to 0.1 inch and wherein said cladding is from 2 to 15% thereof.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |