US3581491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of hot corrosion in gas turbine engines
Assignee: RTX Corp
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Filing: 1969-01-07
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Granted: 1971-06-01
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Expires: 1989-01-07
Abstract
Abstract In order to prevent the accelerated sulfidation attack, or hot corrosion, of the nickel-base and cobalt-base alloys in gas turbine engines operating in atmospheres containing sea salt ingredients, the engine is treated with an oxide of chromium, tin, samarium, or columbium whereby the formation of the detrimental alkali metal species and consequent corrosion is forestalled.
Inventors
- 👤 Norman S Bornstein
- 👤 Michael A Decrescente
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:21
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/30; C; C10; C10L; C10L1/00; C10L1/10; F02C3/00; F02C3/20; F02C3/30; C10L1/12; C10L1/1233; C10L1/1266; C10L1/14; C10L1/18; C10L1/1814; C10L1/188; C10L1/1881; C10L1/1883
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
The method of attenuating sulfidation attack in gas turbine engines subject to the ingestion of alkali metal salts and subject to corrosive attack of nickel-base or cobalt-base alloy turbine section components exposed to hot fuel combustion products containing such salts which comprises: treating the hot combustion products upstream of the turbine section with at least one oxide selected from the group consisting of the oxides of chromium, tin, samarium and columbium to form the stable alkali metal derivatives of these oxides.
Claim 2
Independent Claim
83 words
The method of attenuating sulfidation attack in gas turbine engines subject to the ingestion of alkali metal salts in the airstream traversing the engine and subject to corrosive attack of nickel-base or cobalt-base alloy components exposed to hot gases downstream Of the fuel combustion zone which comprises: upstream of the fuel combustion zone injecting into the engine airstream a compound of chromium, tin, samarium, columbium, or mixtures thereof which is readily converted to the oxide of such metal or metals at elevated temperatures.
Claim 3
Dependent Claim
12 words
The method according to claim 3 wherein the compound is water soluble.
Claim 4
Dependent Claim
12 words
The method according to claim 3 wherein the compound is ammonium chromate.
Claim 5
Independent Claim
62 words
The method of attenuating sulfidation attack in gas turbine engines incorporating nickel-base and cobalt-base alloys and utilizing fuels containing sulfur and subject to the ingestion of alkali metal salts which comprises: mixing the fuel with a stable, soluble compound of chromium, tin, samarium, columbium or mixtures thereof which is readily convertible to the oxide of such metal or metals at elevated temperatures.
Claim 6
Dependent Claim
13 words
The method according to claim 6 wherein the compound is a chromium compound.
Claim 7
Dependent Claim
13 words
The method according to claim 7 wherein the compound is chromium isooctadecylsuccinic anhydride.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |