US3849865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting the surface of a substrate
Assignee: National Aeronautics and Space Administration
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Filing: 1972-10-16
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Granted: 1974-11-26
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Expires: 1992-10-16
Abstract
Abstract The surface of a metallic base system is initially coated with a metallic alloy layer that is ductile and oxidation resistant. An aluminide coating is then applied to the metallic alloy layer. The chemistry of the metallic alloy layer is such that the oxidation resistance of the subsequently aluminized outermost layer is not seriously degraded.
Inventors
- 👤 M Gedwill
- 👤 S Grisaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:34
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/02; C23C28/021; C23C10/00; C23C10/02; C23C28/023; C23C4/00; C23C4/04; C23C4/06; C23C4/073; C30; C30B; C30B21/00; C30B21/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A METHOD OF PROTECTING THE SURFACE OF A SUBSTRATE OF A METALLIC BASE SYSTEM SELECTED FROM THE GROUP CONSISTING OF NICKEL AND COBALT COMPRISING THE STEPS OF CLADDING SAID SURFACE WITH A DUCTILE, OXIDATION RESISTANT METALIC ALLOY FOIL, AND ALUMINIZING THE OUTERMOST SURFACE PORTION OF SAID FOIL THEREBY FORMING AN OUTER ALUMINIDE CONTAINING THEREON.
Claim 2
Independent Claim
54 words
A METHOD OF PROTECTING THE SURFACE OF A SUBSTRATE OF A METALLIC BASE SYSTEM SELECTED FROM THE GROUP CONSISTING OF NICKEL AND COBALT COMPRISING THE STEPS OF CLADDING SAID SURFACE WITH A DUCTILE, OXIDATION RESISTANT METALIC ALLOY FOIL, AND ALUMINIZING THE OUTERMOST SURFACE PORTION OF SAID FOIL THEREBY FORMING AN OUTER ALUMINIDE CONTAINING THEREON.
Claim 3
Dependent Claim
35 words
A method of protecting the surface of a substrate as claimed in claim 1 wherein the substrate comprises a nickel-base material selected from the group consisting of superalloys, dispersion-strengthened alloys, composites, and directional eUtectic alloys.
Claim 4
Dependent Claim
35 words
A method of protecting the surface of a substrate as claimed in claim 1 wherein the substrate comprises a cobalt-base material selected from the group consisting of superalloys, dispersion-strengthened alloys, composites, and directional eutectic alloys.
Claim 5
Dependent Claim
63 words
A method of protecting the surface of a substrate as claimed in claim 1 wherein the substrate is clad with a NiCrAlSi metallic alloy foil having a nominal composition in the range from about 15 percent to about 25 percent chromium, from about 3 percent to about 6 percent aluminum, from about 0.5 percent to about 1.5 percent silicon, and the remainder nickel.
Claim 6
Dependent Claim
46 words
A method of protecting the surface of a substrate as claimed in claim 4 wherein the substrate is clad with a NiCrAlSi metallic alloy foil having a nominal composition of about 18 percent chromium, about 4 percent aluminum, about 1 percent silicon and the remainder nickel.
Claim 7
Dependent Claim
59 words
A method of protecting the surface of a substrate as claimed in claim 1 wherein the substrate is clad with a FeCrAlY metallic alloy foil having a nominal composition in the range from about 15 percent to about 25 percent chromium, from about 3 percent to about 6 percent aluminum, from about 0.1 percent to about 1 percent yttrium.
Claim 8
Dependent Claim
46 words
A method of protecting the surface of a substrate as claimed in claim 6 wherein the substrate is clad with a FeCrAlY metallic alloy foil having a nominal composition of about 25 percent chromium, about 4 percent aluminum, about 1 percent yttrium, and the remainder iron.
Claim 9
Dependent Claim
32 words
A method of protecting the surface of a superalloy substrate as claimed in claim 1 wherein the metallic alloy foil is applied to the surface of the substrate by solid state bonding.
Claim 10
Dependent Claim
25 words
A method of protecting the surface of a substrate as claimed in claim 1 wherein foil cladding is applied by hot isostatic gas pressure bonding.
Claim 11
Dependent Claim
27 words
A method of protecting the surface of a superalloy substrate as claimed in claim 1 wherein the outer aluminide coating is applied by pack cementation in argon.
References Cited (Backward Citations)
US2473712A
Cited
US3201863A
Cited
US3367022A
Cited
US3649225A
Cited
US3647517A
Cited
US3676085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |