Patent US3716398A successfully refreshed from Google Patents.
US3716398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact resistant coatings for nickel-base and cobalt-base superalloys and the like
Assignee: Chromalloy American Corp
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Filing: 1970-08-19
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Granted: 1973-02-13
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Expires: 1990-08-19
Abstract
Abstract In the production of impact and oxidation resistant nickel-base metal coatings on heat resistant superalloys by pack aluminizing in which nickel aluminide is formed to provide the protective coating, markedly improved ductile coatings are produced of high impact resistance by controlling the amount of aluminum in the pack which also contains about 5 to 40 percent by weight of chromium, the amount of aluminum not exceeding 3 percent by weight of the pack.
Inventors
- 👤 R Stueber
- 👤 S Klach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:58
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/48; C22; C22C; C22C19/00; C23C10/52; C23C10/54; C23C10/56; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
251 words
A method of producing aluminized coatings on nickel-base heat resistant alloys characterized by markedly improved ductility under impact which comprises: providing said alloy having a composition containing by weight, up to about 30% Cr, up to about 20% of a metal from the group consisting of Mo and W, up to about 10% of a metal from the group consisting of Cb and Ta, up to about 1% C, up to about 10% by weight of a metal from the group consisting of Ti and Al, the total amount of Ti and Al not exceeding about 12%, up to about 20% Fe, up to about 2% Mn, up to about 2% Si, up to about 0.2% B, up to about 1% Zr, up to about 2% Hf, and the balance at least about 45% by weight of nickel; preparing an aluminum-containing pack consisting essentially by weight of about 5 to 40% chromium, an effective amount of aluminum not exceeding 3 percent, a small but effective amount of a halide energizer, and the balance an inert diluent, prereacting said pack by heating said pack at a temperature ranging from about 1,800*F to 2,200*F, embedding a nickel-base heat resistant alloy in said prereacted pack, and carrying out said method at an elevated aluminizing temperature with the amount of aluminum in said pack less than 3 percent, the ratio of chromium to aluminum in said pack being in excess of 4:1, whereby a coating containing nickel aluminide and having markedly improved ductility is obtained.
Claim 2
Independent Claim
251 words
A method of producing aluminized coatings on nickel-base heat resistant alloys characterized by markedly improved ductility under impact which comprises: providing said alloy having a composition containing by weight, up to about 30% Cr, up to about 20% of a metal from the group consisting of Mo and W, up to about 10% of a metal from the group consisting of Cb and Ta, up to about 1% C, up to about 10% by weight of a metal from the group consisting of Ti and Al, the total amount of Ti and Al not exceeding about 12%, up to about 20% Fe, up to about 2% Mn, up to about 2% Si, up to about 0.2% B, up to about 1% Zr, up to about 2% Hf, and the balance at least about 45% by weight of nickel; preparing an aluminum-containing pack consisting essentially by weight of about 5 to 40% chromium, an effective amount of aluminum not exceeding 3 percent, a small but effective amount of a halide energizer, and the balance an inert diluent, prereacting said pack by heating said pack at a temperature ranging from about 1,800*F to 2,200*F, embedding a nickel-base heat resistant alloy in said prereacted pack, and carrying out said method at an elevated aluminizing temperature with the amount of aluminum in said pack less than 3 percent, the ratio of chromium to aluminum in said pack being in excess of 4:1, whereby a coating containing nickel aluminide and having markedly improved ductility is obtained.
Claim 3
Dependent Claim
40 words
The method of claim 1, wherein the chromium content of said pack ranges by weight from about 10 to 30%, the aluminum content ranging from about 1/2 % to 2 1/2 % and the inert diluent is a refractory oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |