US4169726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting alloy and directionally solidified article
Assignee: General Electric Co
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Filing: 1977-12-21
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Granted: 1979-10-02
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Expires: 1997-12-21
Abstract
Abstract An improved Ni-Co-Cr base casting alloy is particularly useful as a directionally solidified article in the form of a gas turbine blade tip portion to provide resistance to the combination of oxidation, sulfidation and thermal fatigue at elevated temperatures. The alloy base is enhanced through the alloying additions of Ta, Al, W, C, Si and optionally La.
Inventors
- 👤 Norman P. Fairbanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:52
CPC Classifications
C; C22; C22C; C22C30/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12944
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
34 words
An improved casting alloy consisting essentially of, by weight, 32-34% Ni, 32-34% Co, 22-24% Cr, 2.5-3.5% Ta, 3.5-4.5% Al, 2.5-3.5% W, 0.4-0.5% C, 0.6-0.9% Si and up to 0.1% La, along with incidental impurities.
Claim 2
Dependent Claim
34 words
An improved casting alloy consisting essentially of, by weight, 32-34% Ni, 32-34% Co, 22-24% Cr, 2.5-3.5% Ta, 3.5-4.5% Al, 2.5-3.5% W, 0.4-0.5% C, 0.6-0.9% Si and up to 0.1% La, along with incidental impurities.
Claim 3
Dependent Claim
31 words
The alloy of claim 1 consisting nominally, by weight, of 33% Ni, 33% Co, 23% Cr, 3% Ta, 4% Al, 3% W, 0.5% C, and 0.75% Si, along with incidental impurities.
Claim 4
Dependent Claim
15 words
A cast article of the alloy of claim 1 having a directionally oriented crystal structure.
Claim 5
Dependent Claim
13 words
The article of claim 3 in which the structure is a single crystal.
Claim 6
Dependent Claim
39 words
An improved gas turbine engine blade having a body of a superalloy based on an element selected from the group consisting of Co and Ni and a tip portion comprising the article of claim 3, connected to the body.
Claim 7
Dependent Claim
23 words
The turbine blade of claim 5 in which the blade body is a nickel-base superalloy and the blade tip is a monocrystal structure.
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) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |