US4546047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite tape preform for abradable seals
Assignee: RTX Corp
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Filing: 1983-05-02
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Granted: 1985-10-08
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Expires: 2003-05-02
Abstract
Abstract Honeycomb structures, such as those used in turbine engine abradable seals, are provided with a uniform density filling of a suitable abradable material. The abradable material is prepared as a tape preform using an organic binder. The preform is forced into the honeycomb using a rubber tool.
Inventors
- 👤 Edward J. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:19
CPC Classifications
B; B22; B22F; B22F5/00; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; B22F3/1115; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B23K35/22; B23K35/24; B23K35/32; B23K35/327; B24; B24D; B24D18/00; F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; F01D11/125; B22F2998/00; B23K35/0233; B23K35/0238; F05; F05D; F05D2250/00; F05D2250/20; F05D2250/28; F05D2250/283; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12146
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A composite abradable preform consisting of a layer of powered material containing a substantial amount of braze alloy, a second layer joined to the first layer comprising a powdered abradable composition consisting by weight of 60-80% nickel, 2-12% chromium, 1-10% cobalt, 4-20% aluminum, 3-15% of an inert material selected from the group consisting of diatomaceous earth, boron nitride, silica glass, mica, vermiculite, asbestos, molybdenum disulfide, graphite, cobalt oxide, cerium oxide, zinc oxide, and mixtures thereof, and up to 3% of a material selected from the group consisting of yttrium, hafnium, lanthanum, and mixtures thereof, both of said layers also containing a binder and a plasticizer and being flexible and compliant.
Claim 2
Dependent Claim
110 words
A composite abradable preform consisting of a layer of powered material containing a substantial amount of braze alloy, a second layer joined to the first layer comprising a powdered abradable composition consisting by weight of 60-80% nickel, 2-12% chromium, 1-10% cobalt, 4-20% aluminum, 3-15% of an inert material selected from the group consisting of diatomaceous earth, boron nitride, silica glass, mica, vermiculite, asbestos, molybdenum disulfide, graphite, cobalt oxide, cerium oxide, zinc oxide, and mixtures thereof, and up to 3% of a material selected from the group consisting of yttrium, hafnium, lanthanum, and mixtures thereof, both of said layers also containing a binder and a plasticizer and being flexible and compliant.
Claim 3
Dependent Claim
22 words
A preform as in claim 1 in which the binder is selected from the group consisting of polyvinyl alcohols and polyvinyl methacrylates.
References Cited (Backward Citations)
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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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |