US4414249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing metallic articles having durable ceramic thermal barrier coatings
Assignee: RTX Corp
•
Filing: 1981-12-04
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Granted: 1983-11-08
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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. An important feature of the invention is that the interface between the MCrAlY layer and the alumina layer has a low surface roughness and this greatly improves the columnar ceramic layer adherence.
Inventors
- 👤 Nicholas E. Ulion
- 👤 Duane L. Ruckle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/02; C23C14/024; C23C14/025; C23C14/028; C23C14/06; C23C14/08; C23C14/083; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; F05; F05D; F05D2250/00; F05D2250/60; F05D2250/62; F05D2250/621
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 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 adherent layer of MCrAlY to the clean surface c. polishing the MCrAlY layer to a smoothness of less than about 25 microinches RMS d. applying a columnar ceramic coating to the polished MCrAlY layer by vapor deposition e. heat treating the columnar ceramic coated article in a oxygen containing atmosphere to develop an alumina layer between the MCrAlY and the columnar ceramic coating.
Claim 2
Independent Claim
95 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 adherent layer of MCrAlY to the clean surface c. polishing the MCrAlY layer to a smoothness of less than about 25 microinches RMS d. applying a columnar ceramic coating to the polished MCrAlY layer by vapor deposition e. heat treating the columnar ceramic coated article in a 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
23 words
A method as in claim 1 wherein the MCrAlY layer has a surface finish of less than about 20 microinches RMS after polishing.
Claim 8
Dependent Claim
15 words
A method as in claim 1 wherein the polishing step is accomplished by mechanical means.
Claim 9
Dependent Claim
15 words
A method as in claim 1 wherein the polishing step is accomplished by chemical means.
Claim 10
Dependent Claim
15 words
A method as in claim 1 wherein the polishing step is accomplished by electrolytic means.
Claim 11
Dependent Claim
16 words
A method as in claim 1 wherein the uniform adherent layer is developed by thermal oxidation.
Claim 12
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 13
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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |