US4055706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for protecting refractory metallic components against corrosion
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1975-07-10
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Granted: 1977-10-25
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Expires: 1995-07-10
Abstract
Abstract In the process of forming a coating selected from nickel and cobalt-based coatings on a surface of a component made of a metallic material having a total composition by weight comprising at least 50% of metal selected from the group consisting of iron, cobalt and nickel, the improvement comprising forming at least one layer of an alloy of boron with one of nickel, cobalt and nickel/cobalt on the component, after which the boron is eliminated.
Inventors
- 👤 Philippe M. Galmiche
- 👤 Pierre J. Lepetit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:44
CPC Classifications
C; C22; C22C; C22C47/00; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3033; C23; C23C; C23C10/00; C23C10/02; C23C10/28; C23C10/34; C23C10/58; C23C18/00; C23C18/16; C23C18/48; C23C18/50; C22C2204/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
In a process of forming a coating selected from nickel and cobalt-based coatings on a surface of a component comprising a metallic refractory material comprising at least 50% by weight of metal selected from the group consisting of iron, cobalt and nickel, the improvement comprising, forming chemically at least one layer comprising an alloy of boron with a member selected from the group consisting of nickel, cobalt and nickel/cobalt on the component, said layer being deposited by immersing the surface of the component in an aqueous bath containing at least one boron salt and at least one salt selected from nickel salts and cobalt salts, after which the boron is eliminated from the layer by heating the coated component in a halogenated and hydrogenated atmosphere at a temperature between 800° and 1250° C, the elimination of the boron being accompanied by diffusion of at least one of cobalt and nickel into the metallic refractory material.
Claim 2
Dependent Claim
155 words
In a process of forming a coating selected from nickel and cobalt-based coatings on a surface of a component comprising a metallic refractory material comprising at least 50% by weight of metal selected from the group consisting of iron, cobalt and nickel, the improvement comprising, forming chemically at least one layer comprising an alloy of boron with a member selected from the group consisting of nickel, cobalt and nickel/cobalt on the component, said layer being deposited by immersing the surface of the component in an aqueous bath containing at least one boron salt and at least one salt selected from nickel salts and cobalt salts, after which the boron is eliminated from the layer by heating the coated component in a halogenated and hydrogenated atmosphere at a temperature between 800° and 1250° C, the elimination of the boron being accompanied by diffusion of at least one of cobalt and nickel into the metallic refractory material.
Claim 3
Dependent Claim
43 words
An improved process according to claim 1 wherein the metallic material contains at least 0.4% by weight of carbon and comprises refractory-metal carbide fibers in a matrix containing at least one metal selected from the group consisting of iron, cobalt, nickel and chromium.
Claim 4
Dependent Claim
20 words
An improved process according to claim 1, wherein the thickness of the alloy layer is between 5 and 70 microns.
Claim 5
Dependent Claim
20 words
An improved process according to claim 1, wherein the thickness of the alloy layer is between 10 and 40 microns.
Claim 6
Dependent Claim
21 words
An improved process according to claim 1, wherein the component is heated in the presence of a source of chromous fluoride.
Claim 7
Dependent Claim
36 words
An improved process according to claim 1, wherein the component is heated in the presence of a source of halogens and of a finely-divided alloy having a composition similar to that of the processed metallic material.
Claim 8
Dependent Claim
27 words
An improved process according to claim 1, wherein the component is heated in a reactive material comprising chemically inert particulate metal mixed with a source of halogen.
Claim 9
Dependent Claim
20 words
An improved process according to claim 1, wherein the coating comprises a pre-casting, on which a casing is subsequently deposited.
Claim 10
Dependent Claim
34 words
An improved process according to claim 8 wherein the casing comprises an alloy containing at least one metal selected from chromium and aluminum in a proportion substantially higher than in the processed metallic material.
Claim 11
Dependent Claim
43 words
An improved process according to claim 9, wherein the casing is deposited by heating the component in a reactive material comprising a chemically inert powder mixed with a halogenated compound and a powdered aluminum-chromium alloy having a particle size greater than one micron.
Claim 12
Dependent Claim
18 words
A metallic component having a nickel- or cobalt-based coating thereon and made by the process of claim 1.
Claim 13
Dependent Claim
17 words
A metallic component having a pre-casting and a casing and made by the process of claim 8.
References Cited (Backward Citations)
FR644472A
Cited
US3000755A
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US3163553A
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US3589927A
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US3432338A
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Cited
US3562000A
Cited
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US3929427A
Cited
US3917464A
Cited
US3922396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |