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US4045255A
Expired / Lapsed
US
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Directionally solidified eutectic γ+β nickel-base superalloys
Assignee: National Aeronautics and Space Administration
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Filing: 1976-06-01
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Granted: 1977-08-30
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Expires: 1996-06-01
Abstract
Abstract A directionally solidified multivariant eutectic gamma + beta nickel-base superalloy casting having improved high temperature strength and oxidation resistance properties is provided comprising a two phase eutectic structure containing, on a weight percent basis, 5.0-15.0 tungsten, 8.5-14.5 aluminum, 0.0-35.0 cobalt and the balance being nickel. Embedded within the gamma phase nickel-base matrix are aligned eutectic beta phase (primarily (Ni,Co)Al reinforcing lamellae.
Inventors
- 👤 Melvin R. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:25
CPC Classifications
C; C30; C30B; C30B21/00; C30B21/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
An article of manufacture having improved high temperature strength and oxidation resistance properties comprising a directionally solidified multivariant eutectic γ+β nickel-base superalloy casting containing a two phase eutectic structure consisting of a γ phase matrix of a face-centered-cubic solid solution crystal structure based on nickel having embedded in the γ phase an aligned reinforcing lamellar β phase consisting primarily of a nickel-aluminum (Ni,A1) composition which is a body-centered-cubic (CsC1) ordered intermetallic based on NiA1.
Claim 2
Dependent Claim
74 words
An article of manufacture having improved high temperature strength and oxidation resistance properties comprising a directionally solidified multivariant eutectic γ+β nickel-base superalloy casting containing a two phase eutectic structure consisting of a γ phase matrix of a face-centered-cubic solid solution crystal structure based on nickel having embedded in the γ phase an aligned reinforcing lamellar β phase consisting primarily of a nickel-aluminum (Ni,A1) composition which is a body-centered-cubic (CsC1) ordered intermetallic based on NiA1.
Claim 3
Dependent Claim
26 words
The claim 1 article wherein said casting consists essentially of, on a weight percent basis, 5.0-15.0 tungsten, 8.5-14.5 aluminum, 0.0-35.0 cobalt and the balance being nickel.
Claim 4
Dependent Claim
17 words
The claim 2 article containing 7.0-12.5 tungsten, 9.5-12.0 aluminum, 7.0-13.0 cobalt and the balance being essentially nickel.
Claim 5
Dependent Claim
12 words
The claim 2 article containing, on a weight percent basis, 0.0-0.01 boron.
Claim 6
Dependent Claim
12 words
The claim 2 article containing, on a weight percent basis, 0.0-0.1 zirconium.
Claim 7
Dependent Claim
12 words
The claim 2 article, containing, on a weight percent basis, 0.0-0.5 yttrium.
Claim 8
Dependent Claim
35 words
The claim 2 article containing, on a weight percent basis 0.0-2.5 molybdenum as a replacement for tungsten on an atomic ratio basis of about 1:1, up to a limit of 1.5 atomic percent of tungsten.
Claim 9
Dependent Claim
35 words
The claim 2 article containing, on a weight percent basis, 0.0-4.5 rhenium as a replacement for tungsten on an atomic ratio basis of about 1:1 up to a limit of 1.5 atomic percent of tungsten.
Claim 10
Dependent Claim
12 words
The claim 2 article containing, on a weight percent basis, 0.0-3.0 tantalum.
Claim 11
Dependent Claim
12 words
The claim 2 article containing, on a weight percent basis 0.0-2.0 niobium.
Claim 12
Dependent Claim
21 words
The claim 1 article consisting essentially of, on a weight percent basis, 10.8 tungsten, 11.3 aluminum, 10.6 cobalt and 67.3 nickel.
Claim 13
Dependent Claim
23 words
The claim 6 article, consisting essentially of, on a weight percent basis, 9.3 tungsten, 11.4 aluminum, 10.7 cobalt, 0.2 yttrium and 68.4 nickel.
References Cited (Backward Citations)
US3944416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |