US4501776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of forming a protective diffusion layer on nickel, cobalt and iron base alloys
Assignee: Turbine Components Corp
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Filing: 1982-11-01
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Granted: 1985-02-26
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Expires: 2002-11-01
Abstract
Abstract Methods are provided for forming protective diffusion layers on nickel, cobalt and iron base alloy parts comprising the steps of depositing a coating of a platinum group metal on the surface of the part to be protected and forming a diffusion layer of platinum and aluminum on said surfaces by gas phase aluminizing said surfaces out of contact with a source of gaseous aluminizing species at elevated temperature.
Inventors
- 👤 Srinivasan Shankar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:19
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/06; C23C10/16; C23C10/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
A method for forming a protective diffusion layer on selected areas of nickel, cobalt and iron base alloy parts comprising the steps of depositing a coating of a platinum group metal on the surface of the part to be protected and forming a diffusion layer of platinum and aluminum on said surfaces by gas phase aluminizing said surfaces out of contact with a source of aluminizing gaseous species at elevated temperature.
Claim 2
Independent Claim
71 words
A method for forming a protective diffusion layer on selected areas of nickel, cobalt and iron base alloy parts comprising the steps of depositing a coating of a platinum group metal on the surface of the part to be protected and forming a diffusion layer of platinum and aluminum on said surfaces by gas phase aluminizing said surfaces out of contact with a source of aluminizing gaseous species at elevated temperature.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the platinum group metal is platinum.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the platinum group metal coating is applied by one of electroplating, dipping, spraying, vapor deposition, sputtering and mechanical plating.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 2 wherein the platinum coating is applied by one of electroplating, dipping, spraying, vapor deposition, sputtering and mechanical plating.
Claim 6
Dependent Claim
40 words
A method as claimed in claim 1 wherein the gas phase aluminizing is carried out by holding the part at elevated temperature above and spaced from a mixture consisting of a source of aluminum, an activator and an inert filler.
Claim 7
Dependent Claim
40 words
A method as claimed in claim 2 wherein the gas phase aluminizing is carried out by holding the part at elevated temperature above and spaced from a mixture consisting of a source of aluminum, an activator and an inert filler.
Claim 8
Dependent Claim
40 words
A method as claimed in claim 4 wherein the gas phase aluminizing is carried out by holding the part at elevated temperature above and spaced from a mixture consisting of a source of aluminum, an activator and an inert filler.
Claim 9
Dependent Claim
32 words
A method as claimed in claim 1 wherein the part coated with platinum group metal is heated to diffuse the platinum into the surfaces of the part prior to gas phase aluminizing.
Claim 10
Dependent Claim
35 words
A method as claimed in claim 8 wherein the part is heated to a temperature between about 1500° F. and 2000° F. in one of a vacuum or inert atmosphere for one to five hours.
Claim 11
Dependent Claim
32 words
A method as claimed in claim 2 wherein the part coated with platinum group metal is heated to diffuse the platinum into the surfaces of the part prior to gas phase aluminizing.
Claim 12
Dependent Claim
35 words
A method as claimed in claim 10 wherein the part is heated to a temperature between about 1500° F. and 2000° F. in one of a vacuum or inert atmosphere for one to five hours.
Claim 13
Dependent Claim
41 words
A method as claimed in claim 1 wherein gas phase aluminizing is carried out at a temperature between about 1200° F. and 2100° F. in one of a vacuum, an inert atmosphere and a reducing atmosphere for one to twenty hours.
Claim 14
Dependent Claim
41 words
A method as claimed in claim 2 wherein gas phase aluminizing is carried out at a temperature between about 1200° F. and 2100° F. in one of a vacuum, an inert atmosphere and a reducing atmosphere for one to twenty hours.
Claim 15
Dependent Claim
41 words
A method as claimed in claim 5 wherein the mixture consists essentially of about 1 to 35% of one or more of the group consisting of aluminum and aluminum alloys, up to about 40% activator and the balance aluminum oxide filler.
Claim 16
Dependent Claim
41 words
A method as claimed in claim 6 wherein the mixture consists essentially of about 1 to 35% of one or more of the group consisting of aluminum and aluminum alloys, up to about 40% activator and the balance aluminum oxide filler.
References Cited (Backward Citations)
US3677789A
Cited
US4132816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |