US4401697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing columnar grain ceramic thermal barrier coatings
Assignee: RTX Corp
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Filing: 1981-12-04
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Granted: 1983-08-30
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Expires: 2001-12-04
Abstract
Abstract A coated article and method for producing the coated article are described. The article is coated with a system which provides protection against oxidation and corrosion and which significantly reduces the substrate temperature. An MCrAlY layer is applied to the article to be protected and a columnar grain ceramic is applied by vapor deposition to the MCrAlY coated article. An alumina layer which exists between the MCrAly layer and the columnar ceramic layer provides for the adherence of the columnar layer to the MCrAlY layer.
Inventors
- 👤 Thomas E. Strangman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:52
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/005; C; C23; C23C; C23C14/00; C23C14/02; C23C14/024; C23C14/025; C23C14/028; C23C14/06; C23C14/08; C23C14/083; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A method for producing a metallic article having a durable ceramic thermal barrier coating, said method consisting essentially of: a. providing a superalloy substrate with a clean surface b. applying a thin uniform adherent layer of MCrAlY to the clean surface c. applying a columnar ceramic coating to the MCrAlY layer by vapor deposition d. heat treating the columnar ceramic coated article in an oxygen containing atmosphere to develop an alumina layer between the MCrAlY and the columnar ceramic coating.
Claim 2
Independent Claim
80 words
A method for producing a metallic article having a durable ceramic thermal barrier coating, said method consisting essentially of: a. providing a superalloy substrate with a clean surface b. applying a thin uniform adherent layer of MCrAlY to the clean surface c. applying a columnar ceramic coating to the MCrAlY layer by vapor deposition d. heat treating the columnar ceramic coated article in an oxygen containing atmosphere to develop an alumina layer between the MCrAlY and the columnar ceramic coating.
Claim 3
Dependent Claim
15 words
A method as in claim 1 wherein the MCrAlY layer is applied by vapor deposition.
Claim 4
Dependent Claim
17 words
A method as in claim 1 wherein the MCrAlY layer has a thickness of about 1-10 mils.
Claim 5
Dependent Claim
14 words
A method as in claim 2 wherein the vapor deposited MCrAlY is subsequently peened.
Claim 6
Dependent Claim
16 words
A method as in claim 4 wherein the peened vapor deposited coating is subsequently heat treated.
Claim 7
Dependent Claim
16 words
A method as in claim 1 wherein the uniform adherent layer is developed by thermal oxidation.
Claim 8
Dependent Claim
20 words
A method as in claim 1 wherein the thickness of the alumina layer is about 0.01 to about 0.1 mils.
Claim 9
Dependent Claim
27 words
A method as in claim 1 wherein the article is manipulated during application of the ceramic layer so as to encourage the formation of a columnar structure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |