Patent US4013424A successfully refreshed from Google Patents.
US4013424A
Expired / Lapsed
US
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Composite articles
Assignee: Rolls Royce PLC
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Filing: 1974-12-12
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Granted: 1977-03-22
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Expires: 1994-12-12
Abstract
Abstract A high temperature corrosion resistant nickel-base alloy, e.g. for turbine stator blades in gas turbine engines, providing a good balance between mechanical strength, oxidation resistance and compatibility between a coating and a substrate. A preferred composition of the coating alloy, which composition also provides a good balance between sulphidation and oxidation corrosion, is: aluminum 25-30%; chromium 3-14%; tantalum 7-9; yttrium 0.01-0.5%; nickel remainder. An article may be provided in which the coating is combined with a substrate of the same composition except in that the substrate has an aluminum content of 5-6%.
Inventors
- 👤 Paul Wildgoose
- 👤 Raymond George Ubank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:37
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12736; Y10T428/12743
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
An article for use in a high temperature corrosive environment comprising a substrate consisting essentially of, by weight: ______________________________________
Aluminium 5 to 7%
Chromium 3 to 14%
Tantalum 1.5 to 12%
Tungsten 3.5 to 13.5%
Yttrium 0 to 0.5%
Nickel Remainder
______________________________________ and the article further comprising a coating consisting essentially of, by weight: ______________________________________
Aluminium 10 to 30%
Chromium 3 to 14%
Tantalum 1.5 to 12%
Tungsten 3.5 to 13.5%
Yttrium 0.01 to 0.5%
Nickel Remainder
______________________________________ wherein the contents of chromium, tantalum, tungsten and nickel occur in similar proportions in the substrate and the coating but to a lesser total amount in the coating to accommodate the higher aluminium content thereof.
Claim 2
Dependent Claim
113 words
An article for use in a high temperature corrosive environment comprising a substrate consisting essentially of, by weight: ______________________________________
Aluminium 5 to 7%
Chromium 3 to 14%
Tantalum 1.5 to 12%
Tungsten 3.5 to 13.5%
Yttrium 0 to 0.5%
Nickel Remainder
______________________________________ and the article further comprising a coating consisting essentially of, by weight: ______________________________________
Aluminium 10 to 30%
Chromium 3 to 14%
Tantalum 1.5 to 12%
Tungsten 3.5 to 13.5%
Yttrium 0.01 to 0.5%
Nickel Remainder
______________________________________ wherein the contents of chromium, tantalum, tungsten and nickel occur in similar proportions in the substrate and the coating but to a lesser total amount in the coating to accommodate the higher aluminium content thereof.
Claim 3
Dependent Claim
20 words
An article according to claim 1 wherein the chromium content in the substrate and the coating is 6 to 14%.
Claim 4
Dependent Claim
21 words
An article according to claim 1 wherein the chromium content in the substrate and in the coating is 9 to 14%.
Claim 5
Dependent Claim
21 words
An article according to claim 1 wherein the chromium content in the substrate and in the coating is 10 to 14%.
Claim 6
Dependent Claim
19 words
An article according to claim 1 wherein the chromium content in the substrate and in the coating is 11-13%.
Claim 7
Dependent Claim
111 words
An article for use in a high temperature corrosive environments comprising a substrate consisting essentially of, by weight: ______________________________________
Aluminium 5 to 6%
Chromium 11 to 13%
Tantalum 7 to 9%
Tungsten 7 to 9%
Yttrium 0 to 0.5%
Nickel Remainder
______________________________________ and the article further comprising a coating consisting essentially of, by weight: ______________________________________
Aluminium 25-30%
Chromium 11 to 13%
Tantalum 7 to 9%
Tungsten 7 to 9%
Yttrium 0.01 to 0.5
Nickel Remainder
______________________________________ wherein the contents of chromium, tantalum, tungsten and nickel occur in similar proportions in the substrate and the coating but to a lesser total amount in the coating to accommodate the higher aluminium content thereof.
Claim 8
Dependent Claim
111 words
An article for use in a high temperature corrosive environments comprising a substrate consisting essentially of, by weight: ______________________________________
Aluminium 5 to 6%
Chromium 11 to 13%
Tantalum 7 to 9%
Tungsten 7 to 9%
Yttrium 0 to 0.5%
Nickel Remainder
______________________________________ and the article further comprising a coating consisting essentially of, by weight: ______________________________________
Aluminium 25-30%
Chromium 11 to 13%
Tantalum 7 to 9%
Tungsten 7 to 9%
Yttrium 0.01 to 0.5
Nickel Remainder
______________________________________ wherein the contents of chromium, tantalum, tungsten and nickel occur in similar proportions in the substrate and the coating but to a lesser total amount in the coating to accommodate the higher aluminium content thereof.
Claim 9
Dependent Claim
17 words
An article according to claim 1 wherein the yttrium content of the substrate is 0 to 0.2%.
Claim 10
Dependent Claim
17 words
An article according to claim 6 wherein the yttrium content of the substrate is 0 to 0.2%.
Claim 11
Dependent Claim
21 words
An article according to claim 1 wherein the substrate and the coating each include a carbon content of 0.03 to 0.1%.
Claim 12
Dependent Claim
21 words
An article according to claim 6 wherein the substrate and the coating each include a carbon content of 0.03 to 0.1%.
References Cited (Backward Citations)
US3754902A
Cited
US3754903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |