US4093782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazed aluminum composite
Assignee: Rio Tinto Switzerland AG
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Filing: 1977-03-03
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Granted: 1978-06-06
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Expires: 1997-03-03
Abstract
Abstract Corrosion resistant brazed aluminum composite. The core alloy consists essentially of an aluminum base alloy containing from 0.05 to 0.4% chromium, from 0.02 to 0.9% manganese, up to 0.2% iron, up to 0.1% silicon and the balance essentially aluminum. The cladding brazing alloy consists essentially of an aluminum base alloy containing 4 to 14% silicon, up to 3% magnesium, up to 0.2% bismuth, balance essentially aluminum.
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 00:27
CPC Classifications
C; C22; C22C; C22C21/00; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; B32; B32B; B32B15/00; B32B15/01; B32B15/016; C22C21/02; C22F; C22F1/00; C22F1/04; C22F1/043; C22F1/05; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A brazed aluminum composite having improved resistance to intergranular corrosion comprising an aluminum alloy core material consisting essentially of from 0.05 to 0.4% chromium, from 0.2 to 0.9% manganese, up to 0.2% iron, up to 0.1% silicon, balance essentially aluminum, clad with a brazing alloy consisting essentially of from 4 to 14% silicon, up to 3% magnesium, up to 0.2% bismuth, balance essentially aluminum wherein the core contains reduced size and population density of second phase iron containing particles and wherein a silicon rich eutectic from the cladding migrates into the core to a reduced depth, said core being substantially free from FeAl 3 phase.
Claim 2
Dependent Claim
105 words
A brazed aluminum composite having improved resistance to intergranular corrosion comprising an aluminum alloy core material consisting essentially of from 0.05 to 0.4% chromium, from 0.2 to 0.9% manganese, up to 0.2% iron, up to 0.1% silicon, balance essentially aluminum, clad with a brazing alloy consisting essentially of from 4 to 14% silicon, up to 3% magnesium, up to 0.2% bismuth, balance essentially aluminum wherein the core contains reduced size and population density of second phase iron containing particles and wherein a silicon rich eutectic from the cladding migrates into the core to a reduced depth, said core being substantially free from FeAl 3 phase.
Claim 3
Dependent Claim
31 words
A composite according to claim 1 wherein said core contains from 0.15 to 0.30% chromium, from 0.3 to 0.6% manganese, from 0.02 to 0.08% iron, and from 0.02 to 0.08% silicon.
Claim 4
Dependent Claim
31 words
A composite according to claim 1 wherein said cladding contains a material selected from the group consisting of bismuth from 0.05 to 0.2%, magnesium from 0.5 to 3% and mixtures thereof.
Claim 5
Dependent Claim
14 words
A composite according to claim 1 wherein the core contains up to 0.1% iron.
Claim 6
Dependent Claim
35 words
A composite according to claim 1 wherein the 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 7
Dependent Claim
17 words
A composite according to claim 1 wherein said core is clad on both sides with said cladding.
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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |