US4275124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon bearing MCrAlY coating
Assignee: RTX Corp
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Filing: 1979-10-15
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Granted: 1981-06-23
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Expires: 1999-10-15
Abstract
Abstract A protectively coated superalloy has improved oxidation, corrosion, and wear resistance at elevated temperatures. The protective coating is a MCrAlY type alloy having a carbon content of 0.6 to 11 percent and is characterized in a preferred embodiment by having a carbon bearing matrix containing metal carbides of 1-2 microns mean size and chromium carbides of less than 12 microns. The coating is preferredly produced by plasma spraying and heat treatment.
Inventors
- 👤 Charles C. McComas
- 👤 James W. Morris
- 👤 Larry S. Sokol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:42
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/073; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/937; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12937
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A superalloy article having a wear resisting and oxidation corrosion protective coating consisting essentially of a carbon rich MCrAlY matrix having fine transition metal carbides of the order of 1-2 microns size and coarser chromium carbides of the order of 12 microns size, produced by plasma spraying MCrAlY and Cr 3 C 2 powders having particle sizes less than 44 microns, the coating having a carbon content of at least 0.6 weight percent wherein M is one or more of nickel, cobalt and iron.
Claim 2
Dependent Claim
84 words
A superalloy article having a wear resisting and oxidation corrosion protective coating consisting essentially of a carbon rich MCrAlY matrix having fine transition metal carbides of the order of 1-2 microns size and coarser chromium carbides of the order of 12 microns size, produced by plasma spraying MCrAlY and Cr 3 C 2 powders having particle sizes less than 44 microns, the coating having a carbon content of at least 0.6 weight percent wherein M is one or more of nickel, cobalt and iron.
Claim 3
Dependent Claim
38 words
The article of claim 1 wherein the coating consists essentially of, by weight percent 18-80 chromium, 1.2-29 aluminum, up to 4.8 yttrium, 0.6-11 carbon, balance selected from the group consisting of nickel, cobalt and iron or mixtures thereof.
Claim 4
Dependent Claim
35 words
The article of claim 2 wherein the elemental weight percents are 23-68 chromium, 4-22 aluminum, up to 4.4 yttrium, 1.5-7.8 carbon, balance selected from the group consisting of nickel, cobalt and iron, or mixtures thereof.
Claim 5
Dependent Claim
32 words
The article of claim 3 wherein the elemental weight percents are 36 chromium, 10 aluminum, 2.6 carbon, 0.5 yttrium, balance selected from the group consisting of nickel, cobalt, iron, or mixtures thereof.
Claim 6
Dependent Claim
17 words
The article of claim 1 wherein the matrix has a DPH hardness value greater than about 725.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |