US4500602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite protective coating for carbon-carbon substrates
Assignee: Lockheed Martin Corp
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Filing: 1981-08-10
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Granted: 1985-02-19
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Expires: 2001-08-10
Abstract
Abstract Composite protective coatings for protecting carbonaceous substrates from degrading in oxygen containing environments are provided. The composite protective coatings include a first coating layer applied to the surface of the substrate. The first coating layer is a silicon carbide type coating. The second coating layer is applied to the surface of a first coating layer and is a sputter deposited phase stabilized zirconium oxide having a columnar microstructure. Carbonaceous substrates having the composite protective coatings are able to withstand temperatures of about 4100° F. in oxygen containing environments.
Inventors
- 👤 James W. Patten
- 👤 Ronald W. Moss
- 👤 Brennan A. Forcht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2949; Y10T428/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A composite protective coating for preventing carbonaceous substrates from degrading in oxygen containing environments comprising: (a) a first coating layer applied to the surface of the substrate comprising a silicon carbide type coating; and (b) a second coating layer applied to the surface of said first coating layer, said second coating layer comprising a sputter deposited, phase stabilized zirconium oxide having a columnar microstructure.
Claim 2
Dependent Claim
64 words
A composite protective coating for preventing carbonaceous substrates from degrading in oxygen containing environments comprising: (a) a first coating layer applied to the surface of the substrate comprising a silicon carbide type coating; and (b) a second coating layer applied to the surface of said first coating layer, said second coating layer comprising a sputter deposited, phase stabilized zirconium oxide having a columnar microstructure.
Claim 3
Dependent Claim
38 words
The composite protective coating as recited in claim 1 wherein said zirconium oxide is phase stabilized with a compound selected from the group consisting of calcium oxide, hafnium oxide, magnesium oxide, cerium oxide, yttrium oxide and mixtures thereof.
Claim 4
Dependent Claim
27 words
The composite protective coating as recited in claim 1 wherein the atomic ratio of zirconium to oxygen of the zirconium oxide is between about 1:1 and 1:2.
Claim 5
Dependent Claim
38 words
The composite protective coating as recited in claim 2 wherein yttrium oxide is utilized as the phase stabilizer and is present in an amount of between 5% and 25% on a molecular basis in said second coating layer.
Claim 6
Dependent Claim
19 words
The composite protective coating as recited in claim 1 wherein said first coating layer is a silicon-silicon carbide-alumina coating.
Claim 7
Dependent Claim
19 words
The composite protective coating as recited in claim 1 wherein said first coating layer is a silicon-silicon carbide-boron coating.
Claim 8
Dependent Claim
83 words
A composite protective coating for preventing carbonaceous substrates from degrading in oxygen containing environments comprising: (a) a first coating layer applied to the surface of the substrate formed from a composition selected from the group of mixtures consisting of (1) silicon, silicon carbide and alumina and (2) silicon, silicon carbide and boron; and (b) a second coating layer applied to the surface of said first coating layer, said second coating layer comprising a sputter deposited, phase stabilized zirconium oxide having a columnar microstructure.
Claim 9
Dependent Claim
83 words
A composite protective coating for preventing carbonaceous substrates from degrading in oxygen containing environments comprising: (a) a first coating layer applied to the surface of the substrate formed from a composition selected from the group of mixtures consisting of (1) silicon, silicon carbide and alumina and (2) silicon, silicon carbide and boron; and (b) a second coating layer applied to the surface of said first coating layer, said second coating layer comprising a sputter deposited, phase stabilized zirconium oxide having a columnar microstructure.
Claim 10
Dependent Claim
38 words
The composite protective coating as recited in claim 7 wherein said zirconium oxide is phase stabilized with a compound selected from the group consisting of calcium oxide, hafnium oxide, magnesium oxide, cerium oxide, yttrium oxide and mixtures thereof.
Claim 11
Dependent Claim
27 words
The composite protective coating as recited in claim 7 wherein the atomic ratio of zirconium to oxygen of the zirconium oxide is between about 1:1 and 1:2.
Claim 12
Dependent Claim
38 words
The composite protective coating as recited in claim 8 wherein yttrium oxide is utilized as the phase stabilizer and is present in an amount of between 5% and 25% on a molecular basis in said second coating layer.
Claim 13
Dependent Claim
19 words
The composite protective coating as recited in claim 7 wherein said first coating layer is a silicon-silicon carbide-alumina coating.
Claim 14
Dependent Claim
19 words
The composite protective coating as recited in claim 7 wherein said first coating layer is a silicon-silicon carbide-boron coating.
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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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |