Patent US3964877A successfully refreshed from Google Patents.
US3964877A
Expired / Lapsed
US
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Porous high temperature seal abradable member
Assignee: General Electric Co
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Filing: 1975-08-22
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Granted: 1976-06-22
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Expires: 1995-08-22
Abstract
Abstract A seal member is provided with an improved combination of oxidation resistance, fluid erosion resistance, reduced thermal conductivity and low flow stress at elevated temperatures through a plurality of metallurgically bonded metal alloy powder particles in the size range substantially of about +140 to about -270 ASTM (U.S. Standard Sieve) the metal particles being metallographically distinguishable and consisting essentially of, by weight, 15 - 35% Cr, about 8 to 20% Al, up to 5% of elements selected from Y, Hf and the rare earth elements, with the balance selected from Fe, Co and Ni, the member having a density in the range of about 65 - 90% of theoretical density.
Inventors
- 👤 Irwin I. Bessen
- 👤 Robert K. Betts
- 👤 Robert V. Hillery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:45
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/08; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939; Y10S277/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
An improved porous high temperature member having an improved combination of oxidation and erosion resistance, controlled thermal conductivity and low elevated flow stress which provides, upon rubbing contact with another member, a compliant base and a flowed, substantially continuous facing, the member comprising: a plurality of metallurgically bonded, metallographically distinguishable metal alloy powder particles substantially in the size range of about +140 to about -270 ASTM (U.S. Standard Sieve); the alloy of the metal particles consisting essentially of, by weight, 15-35% Cr, 8-20% Al, up to 5% of one or more elements selected from the group consisting of Y, Hf and the rare earth elements, with the balance selected from the group consisting of Fe, Co and Ni and incidental impurities; the member having density in the range of about 65-90% of theoretical density established by the inclusion of pores.
Claim 2
Dependent Claim
140 words
An improved porous high temperature member having an improved combination of oxidation and erosion resistance, controlled thermal conductivity and low elevated flow stress which provides, upon rubbing contact with another member, a compliant base and a flowed, substantially continuous facing, the member comprising: a plurality of metallurgically bonded, metallographically distinguishable metal alloy powder particles substantially in the size range of about +140 to about -270 ASTM (U.S. Standard Sieve); the alloy of the metal particles consisting essentially of, by weight, 15-35% Cr, 8-20% Al, up to 5% of one or more elements selected from the group consisting of Y, Hf and the rare earth elements, with the balance selected from the group consisting of Fe, Co and Ni and incidental impurities; the member having density in the range of about 65-90% of theoretical density established by the inclusion of pores.
Claim 3
Dependent Claim
56 words
The member of claim 1 in which the alloy of the metal particles consists essentially of, by weight, 20-23% Cr, 9-13% Al, 0.1-5% of one or more elements selected from the group consisting of Y and Hf with the balance essentially nickel; the member having a density in the range of about 65-83% of theoretical density.
Claim 4
Dependent Claim
56 words
The member of claim 2 in which: the alloy of the metal particles consists essentially of, by weight, 21-23% Cr, 9-11% Al, 0.8-1.2% of one or more elements selected from the group consisting of Y and Hf, with the balance essentially nickel; the member having a density in the range of about 70-83% of theoretical density.
Claim 5
Dependent Claim
29 words
The member of claim 3 in which the alloy of the metal particle consists nominally, by weight, of 22% Cr, 10% Al, 1% Y, with the balance essentially nickel.
Claim 6
Dependent Claim
43 words
The member of claim 1 in which the alloy of the metal particles consists nominally, by weight, of 25% Cr, 10% Al, 1% Y, with the balance essentially Fe; the member having a density in the range of about 75-90% of theoretical density.
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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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |