Patent US4607679A successfully refreshed from Google Patents.
US4607679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Providing oligomer moisture barrier in direct chill casting of aluminum-lithium alloy
Assignee: Alcoa Corp
•
Filing: 1984-12-06
•
Granted: 1986-08-26
•
Expires: 2004-12-06
Abstract
Abstract The present invention involves a process for continuously casting a lithium-containing alloy by direct chill with a direct chill coolant and providing a moisture barrier liquid having a flash point higher than about 400° F. to reduce water absorption in the coolant. The process in one aspect includes applying the moisture barrier liquid as a mold parting composition containing less than a varnish-film forming amount of fatty esters, fatty acids, or fatty alcohols. The process is particularly useful in the direct chill casting of aluminum-lithium alloy by direct chill with ethylene glycol coolant.
Inventors
- 👤 Mei-Yuan Tsai
- 👤 John E. Jacoby
- 👤 Joseph T. Laemmle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:20
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/12; B22D11/124; B22D11/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A process for continuously casting an aluminum alloy containing more than about 1.5% by weight lithium into a solidified ingot having a smallest transverse dimension greater than about 6 inches, comprising: initiating solidification of aluminum-lithium alloy into an ingot in a continuous casting mold; direct chill cooling said ingot with a coolant comprising an organic coolant and a moisture content less than an amount predetermined to avoid explosions, said coolant being applied to the surface of said ingot and separating therefrom: collecting said coolant separating from said ingot in a collection pool: providing a moisture barrier liquid containing alpha-olefin oligomer to reduce moisture absorption in the coolant; and recirculating said coolant from the collection pool for further direct chill cooling.
Claim 2
Dependent Claim
120 words
A process for continuously casting an aluminum alloy containing more than about 1.5% by weight lithium into a solidified ingot having a smallest transverse dimension greater than about 6 inches, comprising: initiating solidification of aluminum-lithium alloy into an ingot in a continuous casting mold; direct chill cooling said ingot with a coolant comprising an organic coolant and a moisture content less than an amount predetermined to avoid explosions, said coolant being applied to the surface of said ingot and separating therefrom: collecting said coolant separating from said ingot in a collection pool: providing a moisture barrier liquid containing alpha-olefin oligomer to reduce moisture absorption in the coolant; and recirculating said coolant from the collection pool for further direct chill cooling.
Claim 3
Dependent Claim
41 words
A process as set forth in claim 1 wherein said alpha-olefin oligomer has a viscosity in the range of about 1-3 centistokes at 450° F. and said process further comprises applying the alpha-olefin oligomer as a parting composition to the mold.
Claim 4
Dependent Claim
22 words
A process as set forth in claim 2 wherein said moisture barrier liquid contains less than a varnish-film forming amount of triglycerides.
Claim 5
Dependent Claim
21 words
A process as set forth in claim 3 wherein said moisture barrier liquid contains less than about 5% by weight triglycerides.
Claim 6
Dependent Claim
18 words
A process as set forth in claim 4 wherein said moisture barrier liquid is substantially free from triglycerides.
References Cited (Backward Citations)
US2515284A
Cited
US3034186A
Cited
US3253932A
Cited
US3381741A
Cited
US3524751A
Cited
US3503770A
Cited
CA925070A
Cited
US3763244A
Cited
US4000625A
Cited
US4157728A
Cited
US4157728B1
Cited
US4282392A
Cited
US4265663A
Cited
US4462948A
Cited
GB2129345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |