Patent US3717419A successfully refreshed from Google Patents.
US3717419A
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Turbine blade
Assignee: Susquehanna Corp
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Filing: 1971-07-09
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Granted: 1973-02-20
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Expires: 1991-07-09
Abstract
Abstract A turbine blade or vane shaped from an article comprising a pyrolytic graphite matrix containing embedded therein at least one reinforcing refractory strand layer, the refractory being carbon or a refractory metal, carbide, boride, nitride, or oxide. The refractory strand layer comprises a plurality of unidirectional and substantially parallel, laterally spaced, individual, continuous refractory strands. The matrix comprises crystallite layers of pyrolytic graphite nucleated from each of the individual refractory strands and interconnected to form a continuous phase surrounding and interconnecting the individual strands comprising the embedded strand layer. The finished blade or vane has the strength and durability to withstand gas turbine temperatures of 2,000* to 5,000*F.
Inventors
- 👤 E Olcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:16
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/522; C04B35/71; C04B35/78; C04B35/80; C04B35/83; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
97 words
A turbine blade for gas turbines, said blade being designed to operate within the temperature range of approximately 2,000*to 5,000*F and being composed of a composite material comprising a pyrolytic graphite matrix containing embedded therein at least one reinforcing refractory strand layer, said strand layer comprising a plurality of unidirectional and substantially parallel, laterally spaced, individual, continuous refractory strands, said matrix comprising crystallite layers of pyrolytic graphite nucleated from each of said individual strands and interconnected to form a continuous phase surrounding and interconnecting each of said individual strands comprising said embedded at least one strand layer.
Claim 2
Dependent Claim
97 words
A turbine blade for gas turbines, said blade being designed to operate within the temperature range of approximately 2,000*to 5,000*F and being composed of a composite material comprising a pyrolytic graphite matrix containing embedded therein at least one reinforcing refractory strand layer, said strand layer comprising a plurality of unidirectional and substantially parallel, laterally spaced, individual, continuous refractory strands, said matrix comprising crystallite layers of pyrolytic graphite nucleated from each of said individual strands and interconnected to form a continuous phase surrounding and interconnecting each of said individual strands comprising said embedded at least one strand layer.
Claim 3
Dependent Claim
20 words
The turbine blade of claim 1 wherein said at least one reinforcing refractory strand layer comprises a plurality of layer.
Claim 4
Dependent Claim
39 words
The turbine blade of claim 2 wherein the unidirectional, substantially parallel strands comprising at least one refractory strand layer are oriented in a direction different from the unidirectional, substantially parallel strands comprising at least one other refractory strand layer.
Claim 5
Dependent Claim
27 words
The turbine blade of claim 1 wherein said individual continuous refractory strands have a lateral spacing between adjacent strands of substantially no grater than about 0.1 inch.
Claim 6
Dependent Claim
11 words
The turbine blade of claim 1 wherein said refractory is carbon.
Claim 7
Dependent Claim
11 words
The turbine blade of claim 2 wherein said refractory is carbon.
Claim 8
Dependent Claim
11 words
The turbine blade of claim 3 wherein said refractory is carbon.
Claim 9
Dependent Claim
11 words
The turbine blade of claim 4 wherein said refractory is carbon.
Claim 10
Dependent Claim
25 words
The turbine blade of claim 1 wherein said refractory is selected from the group consisting of metals and alloys thereof, carbides, borides, nitrides, and oxides.
Claim 11
Dependent Claim
74 words
The turbine blade of claim 9 wherein said metal and alloys thereof are boron, tungsten or molybdenum or alloys thereof, said carbides are silicon, boron, tantalum, zirconium, hafnium, titanium, or niobium carbides or mixtures thereof, said borides are zirconium, hafnium, titanium, or tantalum borides or mixtures thereof, said nitrides are boron nitride or silicon nitride or mixtures thereof, and said oxides are aluminum oxide, silicon oxide, zirconium oxide or hafnium oxide or mixtures thereof.
Claim 12
Dependent Claim
18 words
The shaped pyrolytic graphite article of claim 10 wherein said refractory is silicon carbide, boron, or aluminum oxide.
Claim 13
Dependent Claim
25 words
The turbine blade of claim 2 wherein said refractory is selected from the group consisting of metals and alloys thereof, carbides, borides, nitrides, and oxides.
Claim 14
Dependent Claim
74 words
The turbine blade of claim 12 wherein said metal and alloys thereof are boron, tungsten or molybdenum or alloys thereof, said carbides are silicon, boron, tantalum, zirconium, hafnium, titanium, or niobium carbides or mixtures thereof, said borides are zirconium, hafnium, titanium, or tantalum borides or mixtures thereof, said nitrides are boron nitride or silicon nitride or mixtures thereof, and said oxides are aluminum oxide, silicon oxide, zirconium oxide or hafnium oxide or mixtures thereof.
Claim 15
Dependent Claim
18 words
The shaped pyrolytic graphite article of claim 13 wherein said refractory is silicon carbide, boron, or aluminum oxide.
Claim 16
Dependent Claim
41 words
The turbine blade of claim 1 wherein said crystallite layers include codeposited silicon carbide comprising aciculae of silicon carbide, said aciculae being oriented in the c-direction relative to the a-b plane of the pyrolytic graphite crystallite at the point of embedment.
Claim 17
Dependent Claim
41 words
The turbine blade of claim 12 wherein said crystallite layers include codeposited silicon carbide comprising aciculae of silicon carbide, said aciculae being oriented in the c-direction relative to the a-b plane of the pyrolytic graphite crystallite at the point of embedment.
Claim 18
Dependent Claim
31 words
The turbine blade of claim 1 wherein the direction of strand orientation in the blade is substantially radial with respect to the use of the blade in the aforesaid gas turbine.
Claim 19
Dependent Claim
31 words
The turbine blade of claim 6 wherein the direction of strand orientation in the blade is substantially radial with respect to the use of the blade in the aforesaid gas turbine.
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |