US4575450A
Expired / Lapsed
US
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Process for obtaining extruded semifinished products from high resistance aluminum alloy powder
Assignee: Pechiney SA
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Filing: 1984-01-12
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Granted: 1986-03-11
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Expires: 2004-01-12
Abstract
Abstract This invention relates to a process for obtaining extruded semifinished products from high resistance aluminum alloy powder. It is characterized in that there is used particularly a powder of an aluminum-lithium alloy obtained by atomization in a neutral gas. This powder is loaded in a jacket of aluminum alloy of the 5000 type, then hot degassed under a pressure less than the atmospheric pressure; after sealing of the jacket, the unit is subjected to hot inverted extrusion and heat treated in the ambient air. The plated composite semifinished product thus obtained exhibits a very high resistance and finds its application particularly in the aeronautical industry.
Inventors
- 👤 Jean Meunier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:58
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/20; B22F3/12; B22F3/1208; B22F3/1216
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A process for producing extruded semi-finished products from a high resistance aluminum alloy powder which comprises: (a) hot degassing said powder, produced by atomization in an inert gas, in a jacket of aluminum alloy which is capable of deformation during extrusion, at a pressure of less than 1×10 -3 torr and at a temperature of between 350° and 500° C., (b) sealing said jacket in an air-tight manner, (c) directly subjecting the sealed jacket to hot inverted-extrusion at a temperature betwen 350° and 500° C. to form a semi-finished product and (d) heat treating the formed semi-finished product.
Claim 2
Dependent Claim
98 words
A process for producing extruded semi-finished products from a high resistance aluminum alloy powder which comprises: (a) hot degassing said powder, produced by atomization in an inert gas, in a jacket of aluminum alloy which is capable of deformation during extrusion, at a pressure of less than 1×10 -3 torr and at a temperature of between 350° and 500° C., (b) sealing said jacket in an air-tight manner, (c) directly subjecting the sealed jacket to hot inverted-extrusion at a temperature betwen 350° and 500° C. to form a semi-finished product and (d) heat treating the formed semi-finished product.
Claim 3
Dependent Claim
15 words
Process as in claim 1, wherein the powder has a granulometry less than 400 μm.
Claim 4
Dependent Claim
21 words
The process as in claim 1, wherein the powder aluminum alloy is selected from the group consisting of the 7000 series.
Claim 5
Dependent Claim
22 words
The process as in claim 3, wherein the powder aluminum alloy is selected from the group consisting of 7090 and 7091 alloys.
Claim 6
Dependent Claim
13 words
The process as in claim 1, wherein the powder aluminum alloy contains lithium.
Claim 7
Dependent Claim
16 words
The process as in claim 5, wherein the powder aluminum alloy contains 2 to 3% lithium.
Claim 8
Dependent Claim
29 words
The process as in claim 5, wherein the powder aluminum alloy contains at least one of the elements selected from the group consisting of copper, magnesium, zinc and zirconium.
Claim 9
Dependent Claim
17 words
The process as in claim 3, wherein the powder is precompacted cold before loading in the jacket.
Claim 10
Dependent Claim
12 words
The process as in claim 1, wherein the inert gas is helium.
Claim 11
Dependent Claim
22 words
The process as in claim 1, wherein the jacket is of aluminum alloy selected from the group consisting of the 5000 series.
Claim 12
Dependent Claim
27 words
The process as in claim 10, wherein the jacket is selected from the group consisting of the A-G3s and the A-G5s of the 5000 series has been.
Claim 13
Dependent Claim
23 words
The process as in claim 1, wherein extrusion is effected at a speed greater than that of the products cast of hard alloys.
Claim 14
Dependent Claim
27 words
The process as in claim 5, wherein the extruded product is subjected to a treatment of being placed in solution at 500° C. in the ambient air.
Claim 15
Dependent Claim
26 words
The process as in claim 1, wherein the extruded product is subjected to an aging process between 150° and 200° C. for 6 to 10 hours.
References Cited (Backward Citations)
GB879590A
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US3664008A
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US3954458A
Cited
US4110131A
Cited
US4460541A
Cited
US4464199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |