US4585481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overlays coating for superalloys
Assignee: RTX Corp
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Filing: 1983-08-22
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Granted: 1986-04-29
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Expires: 2003-08-22
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
2026-11-01 14:18
CPC Classifications
C; C23; C23C; C23C30/00; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058; C23C4/00; C23C4/04; C23C4/06; C23C4/08; F; F01; F01D; F01D25/00; F01D25/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12778; Y10T428/12861; Y10T428/12931; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
61 words
A coating composition suited for the protection of metallic substrates against high temperature oxidation and corrosion consisting essentially of 5-40% Cr, 8-35% Al, 0.1-2.0% of an oxygen active element selected from the Group IIIB elements including the lanthanides and the actinides, and mixtures thereof, 0.1-7.0% Si and 0.1-2.0% Hf balance selected from the group consisting of Ni, Co and mixtures thereof.
Claim 2
Dependent Claim
61 words
A coating composition suited for the protection of metallic substrates against high temperature oxidation and corrosion consisting essentially of 5-40% Cr, 8-35% Al, 0.1-2.0% of an oxygen active element selected from the Group IIIB elements including the lanthanides and the actinides, and mixtures thereof, 0.1-7.0% Si and 0.1-2.0% Hf balance selected from the group consisting of Ni, Co and mixtures thereof.
Claim 3
Dependent Claim
26 words
A composition as in claim 1 particularly suited for protecting nickel base substrates, which contains 15-25% Cr, 10-20% Al, up to 30% Co balance essentially Ni.
Claim 4
Dependent Claim
13 words
A composition according to claim 2 having enhanced ductility, which contains 15-25% Co.
Claim 5
Dependent Claim
26 words
A composition as in claim 1 particularly suited for protecting cobalt base substrates which contains 15-35% Cr, 10-20% Al, up to 35% Ni balance essentially Co.
Claim 6
Dependent Claim
34 words
A coating composition according to claims 1, 2, 3 or 4 suited 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
27 words
A coating composition according to claims 1, 2, 3 or 4 suited for use on substrates which contain essentially no hafnium, which contains at least 0.2% Hf.
Claim 8
Independent Claim
39 words
A method for improving the high temperature oxidation MCrAlY type protective coatings which comprises adding from 0.1-7.0% Si and 0.1-2.0% Hf to the coating composition wherein M is selected from the group consisting of Ni, Co and mixtures thereof.
Claim 9
Independent Claim
39 words
A method for improving the high temperature oxidation MCrAlY type protective coatings which comprises adding from 0.1-7.0% Si and 0.1-2.0% Hf to the coating composition wherein M is selected from the group consisting of Ni, Co and mixtures thereof.
Claim 10
Dependent Claim
60 words
A coating composition suited for the protection of metallic substrates against high temperature oxidation and corrosion consisting essentially of 15-25% Cr, 10-20 % Al, 0.1-2.0% of an oxygen active element selected from the Group IIIB elements including the lanthanides and the actinides, and mixtures thereof, 0.1-7.0% Si and 0.1-2.0% Hf balance selected from the group consisting of Ni and Co.
Claim 11
Dependent Claim
60 words
A coating composition suited for the protection of metallic substrates against high temperature oxidation and corrosion consisting essentially of 15-25% Cr, 10-20 % Al, 0.1-2.0% of an oxygen active element selected from the Group IIIB elements including the lanthanides and the actinides, and mixtures thereof, 0.1-7.0% Si and 0.1-2.0% Hf balance selected from the group consisting of Ni and Co.
Claim 12
Dependent Claim
22 words
A composition as in claim 8 particularly suited for protecting nickel base substrates, which contains up to 30% Co balance essentially Ni.
Claim 13
Dependent Claim
13 words
A composition according to claim 9 having enhanced ductility, which contains 15-25% Co.
Claim 14
Dependent Claim
22 words
A composition as in claim 8 particularly suited for protecting cobalt base substrates which contains up to 30% Ni balance essentially Co.
Claim 15
Dependent Claim
30 words
A coating composition according to claim 8 suited for use at temperatures in excess of about 2100° F. in which the Si content is limited to a maximum of 2%.
Claim 16
Dependent Claim
23 words
A coating composition according to claim 8 suited for use on substrates which contain essentially no hafnium, which contains at least 0.2% Hf.
Claim 17
Dependent Claim
53 words
A coating composition suited for the protection of metallic substrates against high temperature oxidation and corrosion consisting essentially of 15-25% Cr, 10-20% Al, 0.1-2.0% of an oxygen active element selected from the Group IIIB elements including the lanthanides, the actinides and mixtures thereof, 0.1-7.0% Si and 0.1-2.0% Hf, 15-25% Co balance essentially nickel.
Claim 18
Dependent Claim
53 words
A coating composition suited for the protection of metallic substrates against high temperature oxidation and corrosion consisting essentially of 15-25% Cr, 10-20% Al, 0.1-2.0% of an oxygen active element selected from the Group IIIB elements including the lanthanides, the actinides and mixtures thereof, 0.1-7.0% Si and 0.1-2.0% Hf, 15-25% Co balance essentially nickel.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |