US3856583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing hardness of aluminum-silicon composite
Assignee: Ethyl Corp
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Filing: 1973-07-09
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Granted: 1974-12-24
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Expires: 1993-07-09
Abstract
Abstract A method of increasing the hardness of an aluminumsilicon composite comprising aluminum as the principal metal, with silicon, magnesium and copper in substantial amounts, iron, titanium, manganese and zinc in lesser amounts and a substantial amount of a non-metal filler such as zircon, alumina, zirconia or aluminum silicates, wherein the composite is subjected to a three-stage heat treatment comprising a solution heat treatment followed by a first and second precipitation heat treatment.
Inventors
- 👤 R Sanders
- 👤 A Valdo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:30
CPC Classifications
C; C21; C21D; C21D9/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
180 words
A METHOD OF INCREASING THE HARDNESS OF AN ALUMINUMSILICON COMPOSITE, SAID COMPOSITE COMPRISING ESSENTIALLY OF AN ALUMINUM, SILICON, MAGNESIUM ALLOY AND A NON-METAL FILLER NOT SUBJECT TO BEING REDUCED BY ALUMINU SELECTED FROM THE GROUP CONSISTING OF ZIRCON, ALUMINUM ZIRCONIA AND ALUMINUM SILICATES, SAID SILICON BEING PRESENTED IN SAID ALLOY IN AN AMOUNT OF 19-12 PERCENT BY WEIGHT SAID MAGNESIUM BEING PRESENT IN SAID ALLOY IN AN AMOUNT OF ABOUT 2 TO 10 PERCENT BY WEIGHT SUFFICIENT TO REDUCE THE SURFACE OF THE NON-METALLIC FILLER TO A METAL-LIKE COATING WHEN THE METALLIC PHASE OF THE COMPOSITE IS IN A LIQUID STATE, SAID NON-METAL FILLER CONSTITUTING FROM ABOUT 5 TO ABOUT 80 PERCENT OF THE WEIGHT OF THE COMPOSITE, CONSISTING ESSENTIALLY TIALLY OF SUBJECTING AND COMPOSITE TO A THREESTAGE HEAT TREATMENT AS FOLLOWS: A. CONDUCTING A SOLUTION HEAT TREATMENT AT 800*-1,000*F FOR ABOUT 4 TO 24 HOURS FOLLOWED BY A QUENCH; B. CONDUCTING A PRECIPITATION HEAT TREATMENT AT 200*-300*F FOR ABOUT 12 TO 36 HOURS; AND, C. CONDUCTING A SECOND PRECIPITATION HEAT TREATMENT AT 300*F-400*F FOR ABOUT 4 TO 12 HOURS.
Claim 2
Independent Claim
180 words
A METHOD OF INCREASING THE HARDNESS OF AN ALUMINUMSILICON COMPOSITE, SAID COMPOSITE COMPRISING ESSENTIALLY OF AN ALUMINUM, SILICON, MAGNESIUM ALLOY AND A NON-METAL FILLER NOT SUBJECT TO BEING REDUCED BY ALUMINU SELECTED FROM THE GROUP CONSISTING OF ZIRCON, ALUMINUM ZIRCONIA AND ALUMINUM SILICATES, SAID SILICON BEING PRESENTED IN SAID ALLOY IN AN AMOUNT OF 19-12 PERCENT BY WEIGHT SAID MAGNESIUM BEING PRESENT IN SAID ALLOY IN AN AMOUNT OF ABOUT 2 TO 10 PERCENT BY WEIGHT SUFFICIENT TO REDUCE THE SURFACE OF THE NON-METALLIC FILLER TO A METAL-LIKE COATING WHEN THE METALLIC PHASE OF THE COMPOSITE IS IN A LIQUID STATE, SAID NON-METAL FILLER CONSTITUTING FROM ABOUT 5 TO ABOUT 80 PERCENT OF THE WEIGHT OF THE COMPOSITE, CONSISTING ESSENTIALLY TIALLY OF SUBJECTING AND COMPOSITE TO A THREESTAGE HEAT TREATMENT AS FOLLOWS: A. CONDUCTING A SOLUTION HEAT TREATMENT AT 800*-1,000*F FOR ABOUT 4 TO 24 HOURS FOLLOWED BY A QUENCH; B. CONDUCTING A PRECIPITATION HEAT TREATMENT AT 200*-300*F FOR ABOUT 12 TO 36 HOURS; AND, C. CONDUCTING A SECOND PRECIPITATION HEAT TREATMENT AT 300*F-400*F FOR ABOUT 4 TO 12 HOURS.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein the non-metal filler has a particle size of about 60 mesh to about -400 mesh, U.S. Sieve Series.
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |