US4569889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polished overlay coatings with enhanced durability
Assignee: RTX Corp
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Filing: 1984-10-29
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Granted: 1986-02-11
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Expires: 2004-10-29
Abstract
Abstract A method is described for improving the oxidation durability of overlay coatings. By polishing the surface to reduce the surface roughness to less than about 15 microinches AA the initial oxidation durability of the material, the point at which oxide spallation is first observed, can be increased from about 5 hours to about 200-300 hours.
Inventors
- 👤 John S. Przybyszewski
- 👤 Richard G. Claing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:15
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/18; C30; C30B; C30B29/00; C30B29/10; C30B29/52; C30B33/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12472; Y10T428/12993
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
39 words
A method for improving the oxidation durability of an MCrAlY overlay coated superalloy component at elevated temperatures which comprises: polishing the gas contacting surface of the coating to produce a surface roughness of less than about 15 microinches AA.
Claim 2
Independent Claim
39 words
A method for improving the oxidation durability of an MCrAlY overlay coated superalloy component at elevated temperatures which comprises: polishing the gas contacting surface of the coating to produce a surface roughness of less than about 15 microinches AA.
Claim 3
Dependent Claim
14 words
A method as in claim 1 in which the polishing technique involves mechanical abrasion.
Claim 4
Dependent Claim
34 words
A gas turbine engine superalloy component having an MCrAlY overlay protective coating, said coating having an outer, gas contacting surface having a coating with a surface roughness of less than about 15 microinches AA.
Claim 5
Dependent Claim
34 words
A gas turbine engine superalloy component having an MCrAlY overlay protective coating, said coating having an outer, gas contacting surface having a coating with a surface roughness of less than about 15 microinches AA.
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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |