US4861551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevated temperature aluminum alloys
Assignee: National Aeronautics and Space Administration
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Filing: 1987-07-30
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Granted: 1989-08-29
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Expires: 2007-07-30
Abstract
Abstract Three aluminum-lithium alloys are provided for high performance aircraft structures and engines. All three alloys contain 3 wt % copper, 2 wt % lithium, 1 wt % magnesium, and 0.2 wt % zirconium. Alloy 1 has no further alloying elements. Alloy 2 has the addition of 1 wt % iron and 1 wt % nickel. Alloy 3 has the addition of 1.6 wt % chromium to the shared alloy composition of the three alloys. The balance of the three alloys, except for incidentql impurities, is aluminum. These alloys have low densities and improved strengths at temperatures up to 260° C. for long periods of time.
Inventors
- 👤 Peter Meschter
- 👤 Richard J. Lederich
- 👤 James E. O'Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/12; C22C1/00; C22C1/04; C22C1/0408; C22C1/0416
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
47 words
An aluminum based alloy consisting essentially of in weight percent: ______________________________________
Copper 3.0
Lithium 2.0
Magnesium 1.0
Zirconium 0.2
Iron 1.0
Nickel 1.0
Aluminum Balance (except for
incidental impurities)
______________________________________ which is produced by inert gas atomization at solidification rates in excess of 10 3 ° K./S.
Claim 2
Dependent Claim
47 words
An aluminum based alloy consisting essentially of in weight percent: ______________________________________
Copper 3.0
Lithium 2.0
Magnesium 1.0
Zirconium 0.2
Iron 1.0
Nickel 1.0
Aluminum Balance (except for
incidental impurities)
______________________________________ which is produced by inert gas atomization at solidification rates in excess of 10 3 ° K./S.
Claim 3
Dependent Claim
45 words
An aluminum based alloy consisting essentially of in weight percent; ______________________________________
Copper 3.0
Lithium 2.0
Magnesium 1.0
Zirconium 0.2
Chromium 1.6
Aluminum Balance (except for
incidental impurities)
______________________________________ which is produced by inert gas atomization at solidification rates on excess of 10 3 ° K./S.
Claim 4
Dependent Claim
45 words
An aluminum based alloy consisting essentially of in weight percent; ______________________________________
Copper 3.0
Lithium 2.0
Magnesium 1.0
Zirconium 0.2
Chromium 1.6
Aluminum Balance (except for
incidental impurities)
______________________________________ which is produced by inert gas atomization at solidification rates on excess of 10 3 ° K./S.
Claim 5
Dependent Claim
21 words
A high performance aircraft structure requiring elevated temperature service of 260° C. formed from an aluminum alloy according to claim 2.
Claim 6
Dependent Claim
21 words
A high performance aircraft structure requiring elevated temperature service of 260° C. formed from an aluminum alloy according to claim 3.
Claim 7
Dependent Claim
22 words
A high performance aircraft engine component requiring elevated temperature service of 260° C. formed from an aluminum alloy according to claim 2.
Claim 8
Dependent Claim
22 words
A high performance aircraft engine component requiring elevated temperature service of 260° C. formed from an aluminum alloy according to claim 3.
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |