US4034142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superalloy base having a coating containing silicon for corrosion/oxidation protection
Assignee: RTX Corp
•
Filing: 1975-12-31
•
Granted: 1977-07-05
•
Expires: 1995-12-31
Abstract
Abstract Coatings are described which are particularly suited for the protection of nickel and cobalt superalloy articles at elevated temperatures. The protective nature of the coatings is due to the formation of an alumina layer on the surface of the coating which serves to reduce oxidation/corrosion. The coatings contain aluminum, chromium, yttrium (or other oxygen active elements) and a metal chosen from the group consisting of nickel, cobalt and iron or mixtures thereof. The coatings further contain a controlled percentage of silicon which serves to greatly improve the protection afforded by the alumina film to the surface of the coating.
Inventors
- 👤 Ralph Julius Hecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:11
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058; B; B32; B32B; B32B15/00; B32B15/01; C22C19/07; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; C23C30/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
114 words
An article suitable for use at elevated temperature which comprises: a. a superalloy base material b. a coating on the superalloy base material having a composition of from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, the actinides, and mixtures thereof, from about 0.5 to about 7% silicon, balance selected from the group consisting of nickel, cobalt and iron and mixtures thereof, said silicon being present in elemental form in solid solution, said coating tending to form an external continuous layer composed predominately of alumina.
Claim 2
Dependent Claim
114 words
An article suitable for use at elevated temperature which comprises: a. a superalloy base material b. a coating on the superalloy base material having a composition of from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, the actinides, and mixtures thereof, from about 0.5 to about 7% silicon, balance selected from the group consisting of nickel, cobalt and iron and mixtures thereof, said silicon being present in elemental form in solid solution, said coating tending to form an external continuous layer composed predominately of alumina.
Claim 3
Dependent Claim
25 words
An article as in claim 1 wherein the oxygen active element is selected from the group consisting of yttrium, scandium, cerium, lanthanum and mixtures thereof.
Claim 4
Dependent Claim
18 words
An article as in claim 1 wherein the coating composition contains from about 10 to about 35% chromium.
Claim 5
Dependent Claim
18 words
An article as in claim 1 wherein the coating composition contains from about 1 to about 3% silicon.
Claim 6
Dependent Claim
18 words
An article as in claim 1 wherein the coating composition contains from about 10 to about 20% aluminum.
Claim 7
Dependent Claim
14 words
An article as in claim 1 wherein the oxygen active element is predominately yttrium.
Claim 8
Dependent Claim
110 words
A gas turbine engine component which comprises: a. a superalloy base b. a coating on the superalloy base having a composition of from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, the actinides, and mixtures thereof, from about 0.5 to about 7% silicon, balance selected from the group consisting of nickel, cobalt and iron and mixtures thereof, said silicon being present in elemental form in solid solution, said coating tending to form an external continuous protective layer composed predominately of alumina.
Claim 9
Dependent Claim
110 words
A gas turbine engine component which comprises: a. a superalloy base b. a coating on the superalloy base having a composition of from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, the actinides, and mixtures thereof, from about 0.5 to about 7% silicon, balance selected from the group consisting of nickel, cobalt and iron and mixtures thereof, said silicon being present in elemental form in solid solution, said coating tending to form an external continuous protective layer composed predominately of alumina.
Claim 10
Dependent Claim
94 words
A coating composition useful for the protection of superalloy articles against oxidation/corrosion at elevated temperatures consisting essentially of: from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, and actinides, and mixtures thereof, about 0.5 to about 7% silicon, balance chosen from the group consisting of nickel, cobalt, iron and mixtures thereof, said coating tending to form an external continuous protective layer composed predominately of alumina.
Claim 11
Dependent Claim
94 words
A coating composition useful for the protection of superalloy articles against oxidation/corrosion at elevated temperatures consisting essentially of: from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, and actinides, and mixtures thereof, about 0.5 to about 7% silicon, balance chosen from the group consisting of nickel, cobalt, iron and mixtures thereof, said coating tending to form an external continuous protective layer composed predominately of alumina.
Claim 12
Dependent Claim
25 words
An article as in claim 8 wherein the oxygen active element is selected from the group consisting of yttrium, scandium, cerium, lanthanum and mixtures thereof.
Claim 13
Dependent Claim
15 words
A coating composition as in claim 8 wherein the oxygen active element is predominately yttrium.
Claim 14
Dependent Claim
16 words
A coating composition as in claim 8 which contains from about 10 to about 35% chromium.
Claim 15
Dependent Claim
16 words
A coating composition as in claim 8 which contains from about 10 to about 20% aluminum.
Claim 16
Dependent Claim
16 words
A coating composition as in claim 8 which contains from about 1 to about 3% silicon.
Claim 17
Independent Claim
109 words
A method of protecting superalloy articles from oxidation/corrosion at elevated temperatures which comprises: applying a layer of material to the surface of the article by a physical vapor deposition process, said material having a thickness of from 0.001 to 0.010 inches and a composition of from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, the actinides, and mixtures thereof, from about 0.5 to about 7% silicon, balance thereof, chosen from the group consisting of nickel, cobalt, iron and mixtures thereof.
Claim 18
Independent Claim
109 words
A method of protecting superalloy articles from oxidation/corrosion at elevated temperatures which comprises: applying a layer of material to the surface of the article by a physical vapor deposition process, said material having a thickness of from 0.001 to 0.010 inches and a composition of from about 10 to about 45% chromium, from about 6 to about 25% aluminum, from about 0.1 to about 0.7% of an oxygen active element selected from the group consisting of the Group III B elements, the lanthanides, the actinides, and mixtures thereof, from about 0.5 to about 7% silicon, balance thereof, chosen from the group consisting of nickel, cobalt, iron and mixtures thereof.
Claim 19
Dependent Claim
14 words
A method as in claim 14 wherein the physical vapor deposition process comprises sputtering.
References Cited (Backward Citations)
US3741791A
Cited
US3869779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |