US3873347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating system for superalloys
Assignee: General Electric Co
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Filing: 1973-04-02
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Granted: 1975-03-25
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Expires: 1993-04-02
Abstract
Abstract A protective coating system is provided for nickel-base and cobalt-base superalloys which is capable of imparting oxidation and corrosion resistance at elevated temperatures. The superalloy body is first coated by physical vapor deposition with a composition consisting essentially of chromium, aluminum, a member selected from the group consisting of yttrium and the rare earth elements, and at least one element selected from the group consisting of iron, cobalt and nickel, and thereafter the body is subjected to an aluminizing overcoating to increase the corrosion resistance.
Inventors
- 👤 James L Walker
- 👤 John R Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:21
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; C23C10/00; C23C10/02; C23C28/00; C23C28/02; C23C28/021; C23C28/023; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
A METHOD OF IMPROVING THE HIGH TEMPERATURE OXIDATION AND CORROSION RESISTANCE OF A NICKEL-BASE OR A COBALT-BASE SUPERALLOY BODY COMPRISING THE STEPS OF: A. COATING THE SUPERALLOY BODY BY PHYSICAL VAPOR DEPOSITION WITH A COMPOSITION CONSISTING ESSENTIALLY OF CHROMIUM, ALUMINUM, A MEMBER SELECTED FROM THE GROUP CONSISTING OF YTTRIUM AND THE RARE EARTH ELEMENTS, AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, AND B. SUBJECTING THE COATED BODY TO AN ALUMINIZING OVERCOATING BY PACK CEMENTATION TO INCREASE THE OXIDATION AND CORROSION RESISTANCE OF THE COATING.
Claim 2
Independent Claim
92 words
A METHOD OF IMPROVING THE HIGH TEMPERATURE OXIDATION AND CORROSION RESISTANCE OF A NICKEL-BASE OR A COBALT-BASE SUPERALLOY BODY COMPRISING THE STEPS OF: A. COATING THE SUPERALLOY BODY BY PHYSICAL VAPOR DEPOSITION WITH A COMPOSITION CONSISTING ESSENTIALLY OF CHROMIUM, ALUMINUM, A MEMBER SELECTED FROM THE GROUP CONSISTING OF YTTRIUM AND THE RARE EARTH ELEMENTS, AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, AND B. SUBJECTING THE COATED BODY TO AN ALUMINIZING OVERCOATING BY PACK CEMENTATION TO INCREASE THE OXIDATION AND CORROSION RESISTANCE OF THE COATING.
Claim 3
Dependent Claim
38 words
The method of claim 1, wherein said composition consists essentially in weight percent of 14-35% chromium, 4-20% aluminum, 0.1-3% yttrium and the balance being a member selected from the group consisting of iron, cobalt, nickel, and mixtures thereof.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein said composition consists essentially in weight percent of 25-29% chromium, 12-14% aluminum, 0.6-0.9% yttrium and the balance being iron.
Claim 5
Dependent Claim
25 words
The method of claim 1, wherein said composition consists essentially in weight percent of 19-24% chromium, 13-17% aluminum, 0.6-0.9% yttrium, and the balance being cobalt.
Claim 6
Dependent Claim
25 words
The method of claim 1, wherein said composition consists essentially in weight percent of 20-35% chromium, 15-20% aluminum, 0.05-0.30% yttrium and the balance being nickel.
Claim 7
Dependent Claim
12 words
The method of claim 1, wherein said body is a nickel-base superalloy.
Claim 8
Dependent Claim
12 words
The method of claim 1, wherein said body is a cobalt-base superalloy.
Claim 9
Dependent Claim
32 words
The method of claim 1, wherein the first coating has a thickness of about 3-5 mils and the aluminizing overcoating penetrates into the first coating to a depth of about 1-2 mils.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |