US4029477A
Expired / Lapsed
US
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Coated Ni-Cr base dispersion-modified alloy article
Assignee: General Electric Co
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Filing: 1975-10-29
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Granted: 1977-06-14
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Expires: 1995-10-29
Abstract
Abstract An article of improved oxidation resistance includes a metal base of a NiCr dispersion-modified alloy including, by weight, 15 - 30% Cr, 0.1 - 10% of oxides selected from oxides of the rare earth elements, particularly Th, Y and La, up to 1% of elements selected from Ti and Al, with the balance Ni and incidental impurities. To the base is applied a coating consisting essentially of, by weight, about 8 to less than about 14% Al, about 15 - 30% Cr, about 0.01 - 10% of elements selected from Y and Hf, with the balance essentially nickel and incidental impurities.
Inventors
- 👤 John J. Grisik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:08
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
A coated NiCr base dispersion-modified alloy article of improved resistance to oxidation and sulfidation comprising: a dispersion-modified base alloy consisting essentially of, by weight, 15 - 30% Cr, 0.01 - 10% of oxides selected from the group consisting of oxides of the rare earth elements, up to about 1% of elements selected from the group consisting of Ti and A1, with the balance Ni and incidental impurities; and a coating on the base alloy and consisting of, by weight, about 8 to less than about 14% A1, and 15 - 30% Cr, about 0.01 - 10% of elements selected from the group consisting of Y and Hf, with the balance Ni and incidental impurities; the difference between the Cr content of the base and Cr content of the coating being no greater than about 10 weight percent.
Claim 2
Dependent Claim
137 words
A coated NiCr base dispersion-modified alloy article of improved resistance to oxidation and sulfidation comprising: a dispersion-modified base alloy consisting essentially of, by weight, 15 - 30% Cr, 0.01 - 10% of oxides selected from the group consisting of oxides of the rare earth elements, up to about 1% of elements selected from the group consisting of Ti and A1, with the balance Ni and incidental impurities; and a coating on the base alloy and consisting of, by weight, about 8 to less than about 14% A1, and 15 - 30% Cr, about 0.01 - 10% of elements selected from the group consisting of Y and Hf, with the balance Ni and incidental impurities; the difference between the Cr content of the base and Cr content of the coating being no greater than about 10 weight percent.
Claim 3
Dependent Claim
104 words
The article of claim 1 in which: the base consists essentially of, by weight, about 18 - 23% Cr, 0.4 - 3% of oxides selected from the group consisting of oxides of Th, Y and La, with the balance of Ni and incidental impurities; and the coating consists of, by weight, about 8 - 12% A1, 18 - 26Cr, 0.5 - 5% of elements selected from the group consisting of Y and Hf, with the balance Ni and incidental impurities; the difference between the Cr content in the coating and the Cr content in the base being no greater than about 5 weight percent.
Claim 4
Dependent Claim
46 words
The article of claim 2 in which the base, when oxides of Th are selected, includes ThO 2 in the range of about 1.5 - 3% and, when oxides of Y are selected, includes Y 2 O 3 in the range of about 0.4 - 1%.
Claim 5
Dependent Claim
43 words
The article of claim 2 in which the coating consists of, by weight, about 8 - 12% A1, 18 - 26% Cr, 0.5 - 1% of elements selected from the group consisting of Y and Hf, with the balance Ni and incidental impurities.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |