US4419416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overlay coatings for superalloys
Assignee: RTX Corp
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Filing: 1981-08-05
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Granted: 1983-12-06
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Expires: 2001-08-05
Abstract
Abstract Improved coating compositions are described for the protection of superalloys at elevated temperatures. The coatings are of the MCrAlY type where M is nickel or cobalt and are significantly improved by the addition of from 0.1-7% silicon and 0.1-2% hafnium. Coatings of the invention are preferably applied by plasma spraying and as so applied are found to be substantially more effective than prior art coatings.
Inventors
- 👤 Dinesh K. Gupta
- 👤 David S. Duvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:36
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; C23C4/073; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058; C23C30/00; C23C4/08; C23C4/12; C23C4/134; F; F01; F01D; F01D25/00; F01D25/005; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12771; Y10T428/12778; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A gas turbine engine component which comprises a substrate selected from the group consisting of Ni and Co base superalloys having thereon a protective coating consisting essentially of 5-40% Cr, 8-35% Al, 0.1-2.0% Y, 1-7.0% Si and 0.1-2.0% Hf balance selected from the group consisting of Ni, Co and mixtures thereof.
Claim 2
Dependent Claim
51 words
A gas turbine engine component which comprises a substrate selected from the group consisting of Ni and Co base superalloys having thereon a protective coating consisting essentially of 5-40% Cr, 8-35% Al, 0.1-2.0% Y, 1-7.0% Si and 0.1-2.0% Hf balance selected from the group consisting of Ni, Co and mixtures thereof.
Claim 3
Dependent Claim
34 words
A coated article as in claim 1 in which the superalloy substrate is a nickel base superalloy and in which the coating contains 15-25% Cr, 10-20% Al, up to 30% Co, balance essentially Ni.
Claim 4
Dependent Claim
14 words
A coated article as in claim 2 in which the coating contains 15-25% Co.
Claim 5
Dependent Claim
34 words
A coated article as in claim 1 in which the superalloy substrate is a cobalt base superalloy and in which the coating contains 15-35% Cr, 10-20% Al, up to 35% Ni, balance essentially Co.
Claim 6
Dependent Claim
34 words
A coated article as in claims 1, 2, 3, or 4, intended for use at temperatures in excess of about 2100° F., in which the Si content is limited to a maximum of 2%.
Claim 7
Dependent Claim
28 words
A coated article as in claims 1, 2, 3 or 4 in which the substrate is essentially free from hafnium and the coating contains at least 0.2% Hf.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |