Patent US4097276A successfully refreshed from Google Patents.
US4097276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low cost, high temperature turbine wheel and method of making the same
Assignee: Garrett Corp
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Filing: 1975-07-17
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Granted: 1978-06-27
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Expires: 1995-07-17
Abstract
Abstract This turbine wheel has a plurality of blades radiating from a central hub and is manufactured by a novel method including the steps of assembling a plurality of preformed ceramic or superalloy blades into a ring with foot portions on the blades projecting into the central region of the assembly, filling such central region with powdered ceramic material, such as silicon carbide, or a superalloy material, heating and isostatically pressing, at least the central region, to compact the powdered material around the foot portions into a unitary hub. The blade feet are suitably shaped to provide a precise interlocking engagement between the blades and the unitary hub.
Inventors
- 👤 Lyle D. Six
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:45
CPC Classifications
B; B22; B22F; B22F5/00; B22F5/04; B22F7/00; B22F7/06; B22F7/062; B22F7/064; B22F7/08; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; F01D5/30; F01D5/3084; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
211 words
A method of manufacturing turbine wheels of the type having a plurality of blades radiating from a central hub comprising the steps of: a. providing a ring of alternately arranged blades and spacers, said blades being preformed with each having a foot portion projecting into the central region of the ring and with shoulder surface areas on said foot portions facing outwardly from the central region; b. securing the blades and spacers together to retain them in ring forming order; c. substantially completely enclosing the assembly of blades, spacers, and securing means in a heat softenable container; c. filling the central region around the foot portions of the blades with a powdered heat softenable material; e. evacuating and sealing the container; f. heating the container and contents to soften the container and the powdered material; and g. applying isostatic pressure to the exterior of the container inwardly to collapse the container from substantially all sides and to compact the heated powdered material therein into a unitary mass around and completely enveloping the foot portions of the blades to form inwardly facing shoulders of the compacted heated powdered material opposite to and interlocking with the shoulder surface areas of said foot portions to intersecure the blades and the compacted heated powdered material.
Claim 2
Independent Claim
211 words
A method of manufacturing turbine wheels of the type having a plurality of blades radiating from a central hub comprising the steps of: a. providing a ring of alternately arranged blades and spacers, said blades being preformed with each having a foot portion projecting into the central region of the ring and with shoulder surface areas on said foot portions facing outwardly from the central region; b. securing the blades and spacers together to retain them in ring forming order; c. substantially completely enclosing the assembly of blades, spacers, and securing means in a heat softenable container; c. filling the central region around the foot portions of the blades with a powdered heat softenable material; e. evacuating and sealing the container; f. heating the container and contents to soften the container and the powdered material; and g. applying isostatic pressure to the exterior of the container inwardly to collapse the container from substantially all sides and to compact the heated powdered material therein into a unitary mass around and completely enveloping the foot portions of the blades to form inwardly facing shoulders of the compacted heated powdered material opposite to and interlocking with the shoulder surface areas of said foot portions to intersecure the blades and the compacted heated powdered material.
Claim 3
Dependent Claim
20 words
The method of manufacturing turbine wheels set forth in claim 1 in which the blades are composed of ceramic material.
Claim 4
Dependent Claim
29 words
The method of manufacturing turbine wheels set forth in claim 1 in which the foot portions of the preformed blades have fir tree shapes defining said shoulder surface areas.
Claim 5
Dependent Claim
48 words
The method of manufacturing turbine wheels set forth in claim 1 in which the preformed blades are provided with laterally directed projections adjacent the foot portions to form gas passage liners on the hub between adjacent blades, said liners preventing contact between said spacers and said powdered 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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |