Patent US3900668A successfully refreshed from Google Patents.
US3900668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal components for gas turbines of pyrolytic graphite silicon carbide codeposit
Assignee: Atlantic Research Corp
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Filing: 1972-10-30
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Granted: 1975-08-19
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Expires: 1992-10-30
Abstract
Abstract Internal components, such as turbine blades for gas turbines composed of a composite of a pyrolytic graphite matrix containing codeposited crystalline silicon carbide. The pyrolytic graphite matrix comprises crystallite layers of pyrolytic graphite and the silicon carbide is in the form of crystalline aciculae. The silicon carbide aciculae are embedded within the pyrolytic graphite crystallites and oriented so that the longitudinal axes are substantially aligned with the c-direction of the crystallites.
Inventors
- 👤 Eugene L Olcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:24
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/522; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A ROTOR BLADE, STATOR VANE OR SHROUD RING FOR A GAS TURBINE PREPARED FROM A COMPOSITE COMPRISING OF PYROLYTIC GRAPHITE AND SILICON CARBIDE IN WHICH SAID PYROLYTIC GRAPHITE COMPRISES LAYERS OF CRYSTALLITES OF PYROLYTIC GRAPHITE AND SAID SILICON CARBIDE COMPRISES CODEPOSITED CRYSTALLINE ACICULAE EMBEDDED IN SAID CRYSTALLITES, SAID ACICULAE BEING ORIENTED SO THAT THE LONGITUDINAL AXES OF SAID ACICULAE ARE SUBSTANTIALLY ALIGNED IN THE C-DIRECTION RELATIVE TO THE A-B PLANE OF THE ASSOCIATED PYROLYTIC GRAPHITE CRYSTALLINE, SAID SILICON CARBIDE COMPRISING BETWEEN ABOUT 5% AND 95% BY VOLUME OF SAID COMPOSITE.
Claim 2
Dependent Claim
90 words
A ROTOR BLADE, STATOR VANE OR SHROUD RING FOR A GAS TURBINE PREPARED FROM A COMPOSITE COMPRISING OF PYROLYTIC GRAPHITE AND SILICON CARBIDE IN WHICH SAID PYROLYTIC GRAPHITE COMPRISES LAYERS OF CRYSTALLITES OF PYROLYTIC GRAPHITE AND SAID SILICON CARBIDE COMPRISES CODEPOSITED CRYSTALLINE ACICULAE EMBEDDED IN SAID CRYSTALLITES, SAID ACICULAE BEING ORIENTED SO THAT THE LONGITUDINAL AXES OF SAID ACICULAE ARE SUBSTANTIALLY ALIGNED IN THE C-DIRECTION RELATIVE TO THE A-B PLANE OF THE ASSOCIATED PYROLYTIC GRAPHITE CRYSTALLINE, SAID SILICON CARBIDE COMPRISING BETWEEN ABOUT 5% AND 95% BY VOLUME OF SAID COMPOSITE.
Claim 3
Dependent Claim
17 words
The article of claim 1 in which said composite comprises at least 10% by volume silicon carbide.
Claim 4
Dependent Claim
18 words
The article of claim 1 in which said composite comprises about 10 to 50 volume percent silicon carbide.
Claim 5
Dependent Claim
36 words
The article of claim 1 in which said composite comprises a graded relative pyrolytic graphite and silicon carbide composition, in which the relative amounts of each ingredient vary with distance from the surface of the microcomposite.
Claim 6
Dependent Claim
26 words
The article of claim 4 in which the outer portion of the composite has a higher silicon carbide content than the inner portions of the composite.
Claim 7
Dependent Claim
30 words
The article of claim 1 in which at least 50% of the volume of silicon carbide present in said compoSite comprises aciculae having a length-to-diameter ratio of at least 2:1.
Claim 8
Dependent Claim
30 words
The article of claim 1 in which at least 50% of the volume of silicon carbide present in said composite comprises aciculae having a length-to-diameter ratio of at least 4:1.
Claim 9
Dependent Claim
14 words
The article of claim 1 which is in the form of a turbine blade.
Claim 10
Dependent Claim
16 words
The article of claim 1 in which said composite forms a coating on a graphite substrate.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |