Patent US3939895A successfully refreshed from Google Patents.
US3939895A
Expired / Lapsed
US
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Method for casting directionally solidified articles
Assignee: General Electric Co
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Filing: 1974-11-18
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Granted: 1976-02-24
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Expires: 1994-11-18
Abstract
Abstract The invention relates to a method of casting superalloy articles and more particularly to directionally solidifying eutectic superalloy compositions to produce a composite structure of a superalloy matrix reinforced with aligned carbide fibers.
Inventors
- 👤 Thomas F. Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:10
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/045; C; C30; C30B; C30B11/00; C30B11/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A method of producing a directionally solidified cast alloy article in a shell mold, said method comprising providing a mold having a cavity divided into an upper portion and a lower portion, said mold being disposed in a heating zone, placing one end of a longitudinal heat extractor element of said alloy into the lower portion of the cavity, said other end of said heat extractor extending therefrom and being exposed to a continuous flow of fluid coolant, heating said mold and said one end of said heat extractor placed therein at a temperature above the melting range of said alloy to melt a portion of said one end of the heat extractor, filling said mold with said alloy in a molten state, and controllably lowering said mold out of the heating zone to allow said mold and contents thereof to cool and to establish directional solidification of the alloy in said cavity.
Claim 2
Independent Claim
153 words
A method of producing a directionally solidified cast alloy article in a shell mold, said method comprising providing a mold having a cavity divided into an upper portion and a lower portion, said mold being disposed in a heating zone, placing one end of a longitudinal heat extractor element of said alloy into the lower portion of the cavity, said other end of said heat extractor extending therefrom and being exposed to a continuous flow of fluid coolant, heating said mold and said one end of said heat extractor placed therein at a temperature above the melting range of said alloy to melt a portion of said one end of the heat extractor, filling said mold with said alloy in a molten state, and controllably lowering said mold out of the heating zone to allow said mold and contents thereof to cool and to establish directional solidification of the alloy in said cavity.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein said alloy is a nickel-base superalloy.
Claim 4
Dependent Claim
24 words
The method of claim 2, wherein said alloy contains tantalum and carbon in an amount sufficient to form tantalum monocarbide fibers during directional solidification.
Claim 5
Dependent Claim
12 words
The method of claim 1, wherein said alloy is a cobalt-base superalloy.
Claim 6
Dependent Claim
24 words
The method of claim 4, wherein said alloy contains tantalum and carbon in an amount sufficient to form tantalum monocarbide fibers during directional solidification.
Claim 7
Dependent Claim
36 words
The method of claim 1, wherein said heat extractor is exposed to a continuous flow of water coolant and wherein the heat extractor is mounted to a moveable platform by means of a fluid tight seal.
Claim 8
Dependent Claim
16 words
The method of claim 1, wherein said mold is shaped to produce a gas turbine blade.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |