Patent US4237193A successfully refreshed from Google Patents.
US4237193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation corrosion resistant superalloys and coatings
Assignee: General Electric Co
•
Filing: 1978-06-16
•
Granted: 1980-12-02
•
Expires: 1998-06-16
Abstract
Abstract An article of manufacture having improved high temperature oxidation and corrosion resistance comprising: (a) a superalloy substrate containing a carbide reinforcing phase, and (b) a coating consisting of chromium, aluminum, carbon, at least one element selected from iron, cobalt or nickel, and optionally an element selected from yttrium or the rare earth elements.
Inventors
- 👤 Melvin R. Jackson
- 👤 John R. Rairden, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:58
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/02; C23C28/023; C23C30/00; C23C4/00; C23C4/04; C23C4/06; C23C4/073; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12937
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
An article of manufacture having improved high temperature oxidation and corrosion resistance comprising: (a) a superalloy substrate containing a carbide reinforcing phase, and (b) a coating consisting of chromium, aluminum, carbon and at least one element selected from iron, cobalt or nickel, subject to the proviso that the coatings contain an amount of carbon (1) sufficient to saturate any solid state phases of the coating composition, (2) sufficient to essentially equilibrate the chemical potential of carbon in the coating with that in the substrate with minimum interaction, and (3) insufficient to form substantial quantities of carbides in the coating composition.
Claim 2
Dependent Claim
100 words
An article of manufacture having improved high temperature oxidation and corrosion resistance comprising: (a) a superalloy substrate containing a carbide reinforcing phase, and (b) a coating consisting of chromium, aluminum, carbon and at least one element selected from iron, cobalt or nickel, subject to the proviso that the coatings contain an amount of carbon (1) sufficient to saturate any solid state phases of the coating composition, (2) sufficient to essentially equilibrate the chemical potential of carbon in the coating with that in the substrate with minimum interaction, and (3) insufficient to form substantial quantities of carbides in the coating composition.
Claim 3
Dependent Claim
116 words
An article of manufacture having improved high temperature oxidation and corrosion resistance comprising: (a) a superalloy substrate containing a carbide reinforcing phase; (b) a coating consisting of chromium, aluminum, carbon, and at least one element selected from iron, cobalt or nickel, subject to the proviso that the coatings contain an amount of carbon (1) sufficient to saturate any solid state phases of the coating composition, (2) sufficient to essentially equilibrate the chemical potential of carbon in the coating with that in the substrate with minimum interaction, and (3) insufficient to form substantial quantities of carbides in the coating composition; and (c) an aluminizing overcoating to further increase the oxidation and corrosion resistance of the coated substrate.
Claim 4
Dependent Claim
116 words
An article of manufacture having improved high temperature oxidation and corrosion resistance comprising: (a) a superalloy substrate containing a carbide reinforcing phase; (b) a coating consisting of chromium, aluminum, carbon, and at least one element selected from iron, cobalt or nickel, subject to the proviso that the coatings contain an amount of carbon (1) sufficient to saturate any solid state phases of the coating composition, (2) sufficient to essentially equilibrate the chemical potential of carbon in the coating with that in the substrate with minimum interaction, and (3) insufficient to form substantial quantities of carbides in the coating composition; and (c) an aluminizing overcoating to further increase the oxidation and corrosion resistance of the coated substrate.
Claim 5
Dependent Claim
126 words
A superalloy article of manufacture having improved high temperature oxidation and corrosion resistance selected from directionally solidified multivariant eutectic superalloys comprising a matrix of nickel or cobalt-base superalloy body, said matrix containing an aligned eutectic carbide reinforcing phase comprising (a) a superalloy substrate containing a carbide reinforcing phase; and (b) a coating consisting of chromium, aluminum, carbon, and at least one element selected from iron, cobalt, or nickel, subject to the proviso that the coatings contain an amount of carbon (1) sufficient to saturate any solid state phases of the coating composition, (2) sufficient to essentially equilibrate the chemical potential of carbon in the coating with that in the substrate with minimum interaction, and (3) insufficient to form substantial quantities of carbides in the coating composition.
Claim 6
Dependent Claim
126 words
A superalloy article of manufacture having improved high temperature oxidation and corrosion resistance selected from directionally solidified multivariant eutectic superalloys comprising a matrix of nickel or cobalt-base superalloy body, said matrix containing an aligned eutectic carbide reinforcing phase comprising (a) a superalloy substrate containing a carbide reinforcing phase; and (b) a coating consisting of chromium, aluminum, carbon, and at least one element selected from iron, cobalt, or nickel, subject to the proviso that the coatings contain an amount of carbon (1) sufficient to saturate any solid state phases of the coating composition, (2) sufficient to essentially equilibrate the chemical potential of carbon in the coating with that in the substrate with minimum interaction, and (3) insufficient to form substantial quantities of carbides in the coating composition.
Claim 7
Dependent Claim
18 words
The claim 3 article, wherein the coating contains an element selected from yttrium or the rare earth elements.
Claim 8
Dependent Claim
32 words
The claim 4 article, wherein the eutectic carbide reinforcing phase is selected from carbides of the group consisting of tantalum and vanadium and their alloys and mixtures thereof embedded in the matrix.
Claim 9
Dependent Claim
25 words
The claim 3, 4 or 5 article, further comprising (c) an aluminizing overcoating to further increase the oxidation and corrosion resistance of the coated substrate.
References Cited (Backward Citations)
CA710749A
Cited
US3573963A
Cited
US3754898A
Cited
US4003765A
Cited
US3873347A
Cited
US4082581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |