US5262245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Advanced thermal barrier coated superalloy components
Assignee: RTX Corp
•
Filing: 1988-08-12
•
Granted: 1993-11-16
•
Expires: 2008-08-12
Abstract
Abstract An improved thermal barrier coating system is described. A key feature of the invention is the presence of a thin, adherent aluminum oxide scale on the surface of the substrate. An oxide stabilized ceramic coating is present on the surface of the scale. Preferably, the ceramic coating has a columnar grain structure.
Inventors
- 👤 Nicholas E. Ulion
- 👤 Neal P. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:00
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/083; C23C14/02; C23C14/024; C23C28/00; C23C28/04; C23C28/042; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
A coated superalloy component consisting essentially of a nickel or cobalt base superalloy substrate, a thin, adherent aluminum oxide scale on the substrate surface, and a ceramic coating on the aluminum oxide scale.
Claim 2
Dependent Claim
33 words
A coated superalloy component consisting essentially of a nickel or cobalt base superalloy substrate, a thin, adherent aluminum oxide scale on the substrate surface, and a ceramic coating on the aluminum oxide scale.
Claim 3
Dependent Claim
30 words
The component of claim 1, wherein the aluminum oxide scale is between about 0.25 and 20 microns thick and the ceramic coating is between about 25 and 500 microns thick.
Claim 4
Dependent Claim
30 words
The component of claim 2, wherein the aluminum oxide scale is between about 0.25 and 2.5 microns thick and the ceramic coating is between about 125 and 375 microns thick.
Claim 5
Dependent Claim
41 words
The component of claim 1, wherein the ceramic has a columnar grain structure and is based on those ceramics in the group consisting of zirconia, ceria, yttria, and mixtures thereof, and wherein the superalloy substrate contains additions of oxygen active elements.
Claim 6
Dependent Claim
84 words
A coated superalloy component consisting essentially of a nickel base superalloy substrate, a thin, adherent aluminum oxide scale on the substrate surface, and a columnar grain ceramic coating on the aluminum oxide scale, wherein the superalloy consists essentially of, by weight percent, 4-7.5 Cr, 8-12 Co, 0.5-2.5 Mo, 3.5-7.5 W, 2.5-4 Re, 8-10 Ta, 5-6 Al, 0.05-0.5 Hf, 0.005-0.054 oxygen active elements, balance nickel, and has a single crystal structure, and wherein the ceramic is yttria stabilized zirconia and has a columnar grain structure.
Claim 7
Dependent Claim
84 words
A coated superalloy component consisting essentially of a nickel base superalloy substrate, a thin, adherent aluminum oxide scale on the substrate surface, and a columnar grain ceramic coating on the aluminum oxide scale, wherein the superalloy consists essentially of, by weight percent, 4-7.5 Cr, 8-12 Co, 0.5-2.5 Mo, 3.5-7.5 W, 2.5-4 Re, 8-10 Ta, 5-6 Al, 0.05-0.5 Hf, 0.005-0.054 oxygen active elements, balance nickel, and has a single crystal structure, and wherein the ceramic is yttria stabilized zirconia and has a columnar grain structure.
Claim 8
Dependent Claim
27 words
The component of claim 5, wherein the aluminum oxide is between about 0.25 and 20 microns thick and the ceramic coating is between about 25-500 microns thick.
References Cited (Backward Citations)
US3890956A
Cited
US4029477A
Cited
USRE31339E
Cited
US4346137A
Cited
US4530727A
Cited
US4743514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |