US4058415A
Expired / Lapsed
US
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Directionally solidified cobalt-base eutectic alloys
Assignee: General Electric Co
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Filing: 1975-10-30
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Granted: 1977-11-15
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Expires: 1995-10-30
Abstract
Abstract A directionally solidified casting comprising improved high temperature properties is provided having a cobalt-base matrix and consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten, 0-10% chromium, 10-23% tantalum, 0.1-1.5% carbon, the balance being cobalt. Embedded in the matrix is an aligned tantalum carbide reinforcing fibrous phase.
Inventors
- 👤 John L. Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:52
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; C30; C30B; C30B21/00; C30B21/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting comprising a. a matrix of cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten and less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 2
Dependent Claim
72 words
An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting comprising a. a matrix of cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten and less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 3
Dependent Claim
73 words
An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting comprising a. a matrix of a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 10-20% tungsten, and less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 4
Dependent Claim
73 words
An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting comprising a. a matrix of a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 10-20% tungsten, and less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 5
Dependent Claim
83 words
An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting solidified at a rate greater than 1/4 inch per hour comprising a. a matrix of a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten and less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 6
Dependent Claim
83 words
An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting solidified at a rate greater than 1/4 inch per hour comprising a. a matrix of a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten and less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 7
Dependent Claim
12 words
The article of claim 3, wherein the fibrous phase is tantalum monocarbide.
Claim 8
Dependent Claim
47 words
The article of claim 2, wherein a. said superalloy consists essentially of, on a weight basis, 10-15% nickel, 10-20% tungsten, 0-5% chromium, 14-19% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt; and b. an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded in the matrix.
Claim 9
Dependent Claim
18 words
The article of claim 3, wherein the fiber volume fraction of said casting is at least about 8.5%.
Claim 10
Dependent Claim
24 words
The article of claim 3, wherein the average fiber density of said casting is at least about 4.9 × 10 6 fibers/cm. 2 .
Claim 11
Dependent Claim
28 words
The article of claim 3, wherein said casting is characterized at a temperature of 1,950° F. by a stress-rupture lift at 25,000 psi of at least 100 hours.
Claim 12
Dependent Claim
28 words
The article of claim 3, wherein said casting is characterized at a temperature of 1,950° F. by a stress-rupture life at 25,000 psi of at least 1,000 hours.
Claim 13
Dependent Claim
28 words
The article of claim 3, wherein said casting is characterized at a temperature of 1,950° F. by a stressrupture life at 25,000 psi of at least 2,500 hours.
Claim 14
Independent Claim
89 words
A method of improving the high temperature properties, fiber volume fraction and fiber density of a unidirectionally solidified anisotropic metallic casting comprising directionally solidifying at the eutectic solidification temperature of the alloy, at a solidification rate greater than 1/4 of an inch, an alloy matrix comprising a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten, less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt, said alloy matrix having an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded therein.
Claim 15
Independent Claim
89 words
A method of improving the high temperature properties, fiber volume fraction and fiber density of a unidirectionally solidified anisotropic metallic casting comprising directionally solidifying at the eutectic solidification temperature of the alloy, at a solidification rate greater than 1/4 of an inch, an alloy matrix comprising a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten, less than 10% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt, said alloy matrix having an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded therein.
Claim 16
Independent Claim
87 words
A method of improving the high temperature properties, fiber volume fraction and fiber density of a unidirectionally solidified anisotropic metallic casting comprising directionally solidifying at the eutectic solidification temperature of the alloy, at a solidification rate greater than 1/4 of an inch, an alloy matrix comprising a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 10-20% tungsten, 0-5% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt, said alloy matrix having an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded therein.
Claim 17
Independent Claim
87 words
A method of improving the high temperature properties, fiber volume fraction and fiber density of a unidirectionally solidified anisotropic metallic casting comprising directionally solidifying at the eutectic solidification temperature of the alloy, at a solidification rate greater than 1/4 of an inch, an alloy matrix comprising a cobalt-base superalloy consisting essentially of, on a weight basis, 10-20% nickel, 10-20% tungsten, 0-5% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially cobalt, said alloy matrix having an aligned eutectic predominantly tantalum monocarbide reinforcing fibrous phase embedded therein.
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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |