US3837901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion-coating of nickel-base superalloy articles
Assignee: General Electric Co
•
Filing: 1970-08-21
•
Granted: 1974-09-24
•
Expires: 1990-08-21
Abstract
Abstract A nickel-base superalloy article is provided with an oxidationresistant coating by heating it to 1,050*C for 3 hours in a bed consisting of a mixture of fine particles of FeAl3 (40%), NH4F (0.2%) and Al2O3 under a hydrogen atmosphere.
Inventors
- 👤 A Seybolt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:50
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
12 words
The method of claim 1 in which the said source is FeAl2.
Claim 2
Dependent Claim
12 words
The method of claim 1 in which the carrier is sodium fluoride.
Claim 3
Dependent Claim
12 words
The method of claim 1 in which the carrier is ammonium fluoride.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which the aluminum source is Fe2Al5.
Claim 5
Dependent Claim
12 words
The method of claim 1 in which the aluminum source is FeAl3.
Claim 6
Dependent Claim
18 words
The method of claim 1 in which the aluminum source is a mixture of FeAl2, Fe2Al5 and FeAl3.
Claim 7
Dependent Claim
91 words
For use in the diffusion-coating of a nickelbase superalloy article a substantially uniform mixture of minus 100-mesh size fines of alumina, an aluminum source selected from the group consisting of FeAl2, Fe2Al5 and and FeAl3 and mixtures thereof, and a halide carrier selected from the group consisting of ammonium fluoride, ammonium chloride, and sodium fluoride, the aluminum source being present in the mixture in amount of from five to 40 percent, the said carrier being in amount from 0.1 to 0.4 percent and the alumina constituting the balance of the mixture.
Claim 8
Dependent Claim
35 words
The mixture of claim 8 in which the aluminum source is FeAl2 which amounts to 40 percent of the mixture, and in which the carrier is ammonium fluoride amounting to 0.2 percent of the mixture.
Claim 9
Dependent Claim
33 words
The mixture of claim 8 in which the aluminum source is FeAl3 amounting to eight percent of the mixture and the carrier is sodium fluoride amounting to about 0.2 percent of the mixture.
References Cited (Backward Citations)
US3163553A
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US3096160A
Cited
US3257230A
Cited
US3415676A
Cited
US3436249A
Cited
US3677789A
Cited
US3544348A
Cited
US3771974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |