US3720537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of coating an alloy substrate with an alloy
Assignee: RTX Corp
•
Filing: 1970-11-25
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Granted: 1973-03-13
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Expires: 1990-11-25
Abstract
Abstract A process for coating an alloy to render it resistant to oxidation, sulfidation and thermal shock by forming a dispersion of an aluminum alloy and a chromium-aluminum alloy and then bonding the dispersion to the substrate.
Inventors
- 👤 D Rigney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:24
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/02; C23C28/023; B; B22; B22F; B22F7/00; B22F7/02; B22F7/04; C23C26/00; C23C30/00; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A process for depositing a protective cobalt-chromium-aluminum-yttrium alloy coating on an alloy substrate selected from the group consisting of the nickel-base and cobalt-base superalloys to render it resistant to oxidation, sulfidation, and thermal shock, the coating having a melting point higher than that of the substrate, which comprises: forming a slurry consisting essentially of about, by weight, 30-50 percent Co2Al5, 30-50 percent Cr40Al60-x Yx, where x 0.02-2.5 and the quantities of Cr and Al are expressed on a weight basis, in a volatile dispersant; applying the slurry to the substrate; volatilizing the dispersant and heating the substrate to a temperature, below the melting temperature of the substrate, to form the protective alloy coating and bond it to the substrate; and cooling the coated substrate.
Claim 2
Dependent Claim
124 words
A process for depositing a protective cobalt-chromium-aluminum-yttrium alloy coating on an alloy substrate selected from the group consisting of the nickel-base and cobalt-base superalloys to render it resistant to oxidation, sulfidation, and thermal shock, the coating having a melting point higher than that of the substrate, which comprises: forming a slurry consisting essentially of about, by weight, 30-50 percent Co2Al5, 30-50 percent Cr40Al60-x Yx, where x 0.02-2.5 and the quantities of Cr and Al are expressed on a weight basis, in a volatile dispersant; applying the slurry to the substrate; volatilizing the dispersant and heating the substrate to a temperature, below the melting temperature of the substrate, to form the protective alloy coating and bond it to the substrate; and cooling the coated substrate.
Claim 3
Dependent Claim
28 words
The process according to claim 1 wherein the dispersion contains, by weight, less than 10 percent copper, less than 10 percent manganese and less than 5 percent silicon.
Claim 4
Dependent Claim
19 words
The process according to claim 1 wherein the slurry as applied, is between about 0.003 and 0.015 inch thick.
Claim 5
Dependent Claim
53 words
The process according to claim 1 wherein a second coating of the same composition as the first coating is applied to the coated and heated article and the second coating is heated to sinter the alloy whereby the first coating forms a diffusion barrier and the second coating forms an oxidation resistant coating.
Claim 6
Dependent Claim
18 words
The process according to claim 1 wherein the heating is at a temperature between about 1,800* and 2,300*F.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |