US4248940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal barrier coating for nickel and cobalt base super alloys
Assignee: RTX Corp
•
Filing: 1977-06-30
•
Granted: 1981-02-03
•
Expires: 1997-06-30
Abstract
Abstract Adherent, thermal shock-resistant protective coatings for nickel base super alloys are obtained by applying to the base metal a thin bond coat of an alloy of chromium aluminum and yttrium with materials selected from the group consisting of iron, cobalt, nickel and nickel-cobalt and applying thereover a continuously graded mixture of this material with a zirconia-based ceramic, the concentration of zirconia-based ceramic increasing from the bond coat to the outer layer. The zirconia ceramic may be stabilized by the addition thereto of amounts of magnesium oxide or other materials.
Inventors
- 👤 George W. Goward
- 👤 Delton A. Grey
- 👤 Richard C. Krutenat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:22
CPC Classifications
C; C23; C23C; C23C28/00; C23C4/00; C23C4/02; C23C4/04; C23C4/10; C23C4/11; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12937; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
In a thermally protected superalloy structure which comprises a substrate of a material selected from the group consisting of nickel and cobalt-base superalloys, a metal bond coat on said substrate and an oxide stabilized zirconia-base ceramic thermal barrier coating on said bond coat, the improvement wherein said bond coat is an alloy of chromium, aluminum and yttrium with a metal selected from the group consisting of iron, cobalt, nickel and a mixture of nickel and cobalt.
Claim 2
Dependent Claim
76 words
In a thermally protected superalloy structure which comprises a substrate of a material selected from the group consisting of nickel and cobalt-base superalloys, a metal bond coat on said substrate and an oxide stabilized zirconia-base ceramic thermal barrier coating on said bond coat, the improvement wherein said bond coat is an alloy of chromium, aluminum and yttrium with a metal selected from the group consisting of iron, cobalt, nickel and a mixture of nickel and cobalt.
Claim 3
Dependent Claim
38 words
The structure of claim 1 wherein said ceramic thermal barrier material is admixed with the bond coat alloy in a manner such that the concentration of the ceramic material increases continuously from the substrate to the finished surface.
Claim 4
Dependent Claim
21 words
The structure of claim 1 wherein said bond coat alloy is 15-40 percent chromium, 10-25 percent aluminum and 0.01-1 percent yttrium.
Claim 5
Dependent Claim
16 words
The structure of claim 3 wherein said alloy is a nickel, chromium, aluminum and yttrium alloy.
Claim 6
Dependent Claim
16 words
The structure of claim 1 wherein said alloy is a nickel, chromium, aluminum and yttrium alloy.
Claim 7
Dependent Claim
60 words
A coated article of manufacture having a thermal barrier coating system comprising a substrate selected from the group consisting of nickel-base alloys and cobalt-base alloys, a bond coating consisting essentially of a material selected from the group consisting of NiCrAlY, CoCrAlY and mixtures thereof covering said substrate, and a thermal barrier coating consisting essentially of zirconia stabilized with another oxide.
Claim 8
Dependent Claim
60 words
A coated article of manufacture having a thermal barrier coating system comprising a substrate selected from the group consisting of nickel-base alloys and cobalt-base alloys, a bond coating consisting essentially of a material selected from the group consisting of NiCrAlY, CoCrAlY and mixtures thereof covering said substrate, and a thermal barrier coating consisting essentially of zirconia stabilized with another oxide.
Claim 9
Dependent Claim
28 words
The thermal barrier coating system of claim 6 wherein said oxide is selected from the group consisting of ZrO 2 --Y 2 O 3 and ZrO 2 --MgO.
Claim 10
Dependent Claim
26 words
The article of claim 6 wherein said bond coating is 15 to 40 percent chromium, 10 to 25 percent aluminum, and 0.01 to 1 percent yttrium.
Claim 11
Independent Claim
57 words
A method of coating surfaces of nickel-base and cobalt-base alloys comprising: a. coating said surfaces with a bond coating consisting essentially of a material selected from the group consisting of NiCrAlY and CoCrAlY and mixtures thereof; and coating the coated surfaces formed in step (a) with a thermal barrier coating consisting essentially of an oxide stabilized zirconia.
Claim 12
Independent Claim
57 words
A method of coating surfaces of nickel-base and cobalt-base alloys comprising: a. coating said surfaces with a bond coating consisting essentially of a material selected from the group consisting of NiCrAlY and CoCrAlY and mixtures thereof; and coating the coated surfaces formed in step (a) with a thermal barrier coating consisting essentially of an oxide stabilized zirconia.
Claim 13
Dependent Claim
32 words
The method of coating a metal surface as claimed in claim 9 where said oxide is selected from the group consisting of ZrO 2 --Y 2 O 3 and ZrO 2 --MgO.
Claim 14
Dependent Claim
26 words
The method of claim 9 wherein said bond coating is 15 to 40 percent chromium, 10 to 25 percent aluminum and 0.01 to 1 percent yttrium.
References Cited (Backward Citations)
US2937102A
Cited
US3091548A
Cited
US3719519A
Cited
US3481715A
Cited
US3522064A
Cited
US3754903A
Cited
US3676085A
Cited
US3927223A
Cited
US3837894A
Cited
US3846159A
Cited
US3890456A
Cited
US4055705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |