US4039296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clearance control through a Ni-graphite/NiCr-base alloy powder mixture
Assignee: General Electric Co
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Filing: 1975-12-12
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Granted: 1977-08-02
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Expires: 1995-12-12
Abstract
Abstract An improved abradable coating particularly useful to control clearances between relatively moving members in a sealing relationship includes a base portion and an abradable coating portion which is the fusion and interaction product of a mechanical mixture of a plurality of powdered materials comprising a nickel-graphite powder and a nickel-chromium-base alloy powder. One method for making such a seal member includes applying a strippable bond coat of predominantly nickel between a base portion of the member and a subsequently thermal deposited coating.
Inventors
- 👤 Moses A. Levinstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:17
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0084; B; B22; B22F; B22F7/00; B22F7/02; B22F7/04; C23; C23C; C23C4/00; C23C4/04; C23C4/06; F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939; Y10S277/94; Y10S277/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A seal member including: a base portion; and an abradable coating portion which is the fusion and interaction product of a mixture comprising, by weight: i. greater than about 20% to less than about 40% of a nickel-graphite powder consisting essentially of a core of graphite and a shell of nickel, the nickel comprising, by weight, greater than about 50% and less than about 70% of the nickel-graphite powder; and ii. the balance a nickel-chromium base alloy powder; the coating portion secured with the base portion and comprising a dispersion of nickel-coated graphite particles, and a plurality of blocky particles of a nickel-chromium alloy bound primarily with platelets of nickel, the coating portion having a density of about 3.7 - 4.2 grams per cubic centimeter.
Claim 2
Dependent Claim
125 words
A seal member including: a base portion; and an abradable coating portion which is the fusion and interaction product of a mixture comprising, by weight: i. greater than about 20% to less than about 40% of a nickel-graphite powder consisting essentially of a core of graphite and a shell of nickel, the nickel comprising, by weight, greater than about 50% and less than about 70% of the nickel-graphite powder; and ii. the balance a nickel-chromium base alloy powder; the coating portion secured with the base portion and comprising a dispersion of nickel-coated graphite particles, and a plurality of blocky particles of a nickel-chromium alloy bound primarily with platelets of nickel, the coating portion having a density of about 3.7 - 4.2 grams per cubic centimeter.
Claim 3
Dependent Claim
51 words
The seal member of claim 1 which includes, in addition, a bond coat intermediate and bonded with each of the base portion and the abradable coating portion, the bond coat being of a material which is strippable with a chemical solution which has substantially no adverse effect on the base portion.
Claim 4
Dependent Claim
13 words
The seal of claim 2 in which the bond coat is essentially Ni.
Claim 5
Dependent Claim
30 words
The seal of claim 2 in which the base portion is an alloy based on an element selected from the group consisting of Fe, Co, Ni, Ti, Al and Mg.
Claim 6
Dependent Claim
26 words
The seal of claim 1 in which the nickel-graphite powder in the mixture consists essentially of, by weight, 55° - 65% nickel with the balance graphite.
Claim 7
Dependent Claim
36 words
The seal of claim 5 in which the nickel-chromium base alloy powder in the mixture is a composite powder comprising a core of NiCr alloy and a shell of up to about 8 weight percent Al.
Claim 8
Dependent Claim
33 words
The seal of claim 6 in which the composite powder in the mixture consists essentially of, by weight, 4 - 8% Al, 16 - 20% Cr, with the balance Ni and incidental impurities.
Claim 9
Dependent Claim
40 words
The seal of claim 5 in which the nickel-chromium base alloy powder in the mixture is a NiCrFe alloy consisting essentially of, by weight, 15 - 23% Cr, up to about 14% Fe, with the balance Ni and incidental impurities.
References Cited (Backward Citations)
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US3147087A
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US3268997A
Cited
US3350178A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |