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US4113473A
Expired / Lapsed
US
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Process for obtaining novel blanks for extrusion by impact
Assignee: Rio Tinto France SAS
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Filing: 1977-03-16
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Granted: 1978-09-12
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Expires: 1997-03-16
Abstract
Abstract The invention relates to the manufacture of aluminum alloy blanks containing a large quantity of silicon and designed for extrusion by impact. It consists in applying the method of casting with oriented cooling in the main patent to a hypereutectic silicon aluminum alloy which has previously been refined with phosphorus. An even distribution of the remarkably fine primary silicon crystals is obtained in this way. The invention is particularly applicable to the manufacture of linings for heat engines made of aluminum alloys.
Inventors
- 👤 Robert Gauvry
- 👤 Robert Portalier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
B; B22; B22D; B22D15/00; B21; B21C; B21C23/00; B21C23/002; B21C23/02; B21C23/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A process for obtaining homogeneous and isotropic cast blanks for impact extrusion of silicon-aluminum alloys containing more than 12% of silicon comprising the steps of providing a liquid aluminum alloy with more than 12% of silicon, refining said alloy by adding from 0.01% to 0.1% of phosphorus, casting said alloy in a mold having a high thermal conductivity, cooling the mold from the base, applying, once solidification has begun, a pressure in the range of 0.1 to 5 bars.
Claim 2
Dependent Claim
79 words
A process for obtaining homogeneous and isotropic cast blanks for impact extrusion of silicon-aluminum alloys containing more than 12% of silicon comprising the steps of providing a liquid aluminum alloy with more than 12% of silicon, refining said alloy by adding from 0.01% to 0.1% of phosphorus, casting said alloy in a mold having a high thermal conductivity, cooling the mold from the base, applying, once solidification has begun, a pressure in the range of 0.1 to 5 bars.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1 which includes the step of minimizing heat loss from the top of the mold during solidification of the cast alloy.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 2 in which the top of the mold is provided with a removable thermally insulated cover.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 2 in which the heat loss from the top of the mold is minimized by heating the top of the mold.
Claim 6
Dependent Claim
23 words
A process for obtaining blanks as claimed in claim 1, in which the pressure is in the range of 0.2 to 1 bar.
References Cited (Backward Citations)
US1940922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |