US3905723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite ceramic turbine rotor
Assignee: Saint Gobain Abrasives Inc
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Filing: 1972-10-27
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Granted: 1975-09-16
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Expires: 1992-10-27
Abstract
Abstract A turbine rotor, comprising a hub or center section and an outer blade section integrally attached to the hub section, both sections being composed of a ceramic refractory material. The hub section possesses a high degree of mechanical strength, which normally requires that it have a specific gravity close to the theoretical specific gravity of the ceramic material used. The blade section of the rotor, which is permanently bonded to the hub, is composed of the same ceramic material as the hub section but of lower strength and lower density. The effect of the latter is relative ease of fabrication and reduced stresses on the hub section when attached thereto.
Inventors
- 👤 Jr Maurice L Torti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:39
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/575; C04B35/58; C04B35/584; C04B35/591; C04B35/593; F01D5/34; F05; F05D; F05D2300/00; F05D2300/50; F05D2300/522; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49325; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A COMPOSITE CERAMIC TURBINE ROTOR COMPRISING: A HUB SECTION, AND A BLADE SECTION PERMANENTLY JOINED THERETO, WHEREIN THE SPECIFIC GRAVITY OF SAID HUB SECTION IS 90 TO 100%, AND THE SPECIFIC GRAVITY OF SAID BLADE SECTION IS 60 TO 90%, OF THE THEORETICAL SPECIFIC GRAVITY OF THE CERAMIC MATERIAL OF WHICH THEY ARE COMPOSED SAID CERAMIC MATERIAL OF SAID HUB SECTION AND SAID BLADE SECTION IS ONE SELECTED FROM THE GROUP CONSISTING OF SILICON NITRIDE, SILICON CARBIDE, AND MIXTURES THEREOF, AND WHEREIN SAID BLADE SECTION IS COATED WITH AN IMPERCIOUS COATING OF A REFACTORY MATERIAL.
Claim 2
Dependent Claim
95 words
A COMPOSITE CERAMIC TURBINE ROTOR COMPRISING: A HUB SECTION, AND A BLADE SECTION PERMANENTLY JOINED THERETO, WHEREIN THE SPECIFIC GRAVITY OF SAID HUB SECTION IS 90 TO 100%, AND THE SPECIFIC GRAVITY OF SAID BLADE SECTION IS 60 TO 90%, OF THE THEORETICAL SPECIFIC GRAVITY OF THE CERAMIC MATERIAL OF WHICH THEY ARE COMPOSED SAID CERAMIC MATERIAL OF SAID HUB SECTION AND SAID BLADE SECTION IS ONE SELECTED FROM THE GROUP CONSISTING OF SILICON NITRIDE, SILICON CARBIDE, AND MIXTURES THEREOF, AND WHEREIN SAID BLADE SECTION IS COATED WITH AN IMPERCIOUS COATING OF A REFACTORY MATERIAL.
Claim 3
Dependent Claim
29 words
The composite ceramic turbine rotor of claim 1 wherein said refractory material of said impervious layer is one selected from the group consisting of silicon carbide, and silicon nitride.
Claim 4
Dependent Claim
26 words
The turbine rotor of claim 1 wherein said hub section is made up of two parts permanently joined together and permanently joined to said blade section.
Claim 5
Dependent Claim
19 words
The turbine rotor of claim 1 wherein said hub section is joined to said blade section by diffusion bonding.
Claim 6
Dependent Claim
20 words
The turbine rotor of claim 3 wherein said hub section is joined to said blade section with a refractory cement.
Claim 7
Dependent Claim
101 words
A composite ceramic turbine rotor comprising: a hub section, and a blade section permanently joined thereto, wherein the specific gravity of said hub section is 90 to 100% and the specific gravity of said blade section is 60 to 90%, of the theoretical specific gravity of the ceramic material of which they are composed, said ceramic material of said hub section and said blade section is one selected from the group consisting of silicon nitride, silicon carbide, and mixtures thereof, and wherein said hub section is made up of two parts, said parts being permanently jointed together with a refractory cement.
Claim 8
Dependent Claim
101 words
A composite ceramic turbine rotor comprising: a hub section, and a blade section permanently joined thereto, wherein the specific gravity of said hub section is 90 to 100% and the specific gravity of said blade section is 60 to 90%, of the theoretical specific gravity of the ceramic material of which they are composed, said ceramic material of said hub section and said blade section is one selected from the group consisting of silicon nitride, silicon carbide, and mixtures thereof, and wherein said hub section is made up of two parts, said parts being permanently jointed together with a refractory cement.
Claim 9
Dependent Claim
112 words
A composite ceramic turbine rotor comprising: a hub section, and a blade section permanently joined thereto, wherein the specific gravity of said hub section is 90 to 100% and the specific gravity of said blade section is 60 to 90%, of the theoretical specific gravity of the ceramic material of which they are composed, said ceramic material of said hub section and said blade section is one selected from the group consisting of silicon nitride, silicon carbide, and mixtures thereof, and wherein said ceramic material is reinforced with refractory fibers, said refractory fibers being composed of a material selected from the group consisting of carbon, silicon carbide, silicon nitride, and boron nitride.
Claim 10
Dependent Claim
112 words
A composite ceramic turbine rotor comprising: a hub section, and a blade section permanently joined thereto, wherein the specific gravity of said hub section is 90 to 100% and the specific gravity of said blade section is 60 to 90%, of the theoretical specific gravity of the ceramic material of which they are composed, said ceramic material of said hub section and said blade section is one selected from the group consisting of silicon nitride, silicon carbide, and mixtures thereof, and wherein said ceramic material is reinforced with refractory fibers, said refractory fibers being composed of a material selected from the group consisting of carbon, silicon carbide, silicon nitride, and boron nitride.
Claim 11
Dependent Claim
98 words
A composite ceramic turbine rotor comprising: a hub section, and a blade section permanently joined thereto, wherein the specific gravity of said hub section is 90 to 100%, and the specific gravity of said blade section is 60 to 90%, of the theoretical specific gravity of the ceramic material of which they are composed, said ceramic material of said hub section and said blade section is one selected from the group consisting of silicon nitride, silicon carbide, and mixtures thereof, and wherein said blade section is coated with a corrosion and/or erosion resistant coating of a refractory material.
Claim 12
Dependent Claim
98 words
A composite ceramic turbine rotor comprising: a hub section, and a blade section permanently joined thereto, wherein the specific gravity of said hub section is 90 to 100%, and the specific gravity of said blade section is 60 to 90%, of the theoretical specific gravity of the ceramic material of which they are composed, said ceramic material of said hub section and said blade section is one selected from the group consisting of silicon nitride, silicon carbide, and mixtures thereof, and wherein said blade section is coated with a corrosion and/or erosion resistant coating of a refractory material.
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |