Patent US5260099A successfully refreshed from Google Patents.
US5260099A
Expired / Lapsed
US
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Method of making a gas turbine blade having a duplex coating
Assignee: General Electric Co
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Filing: 1992-08-20
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Granted: 1993-11-09
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Expires: 2012-08-20
Abstract
Abstract A stainless steel gas turbine engine compressor blade is protected against corrosion by providing a thin sacrificial coating in the form of a coherent aluminum body in electrically-conducting contact with the blade surface, then overcoating the aluminum coat with a phosphate-chromate mixture in organic vehicle and drying and heating to cure and repeating the overcoating step several times to harden and densify the resulting ceramic body.
Inventors
- 👤 Roger W. Haskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:17
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
150 words
The method of making a steel gas turbine engine compressor blade having a duplex coating qualifying the blade for use in corrosive environments which comprises the steps of coating the blade with a slurry consisting essentially of aluminum particles in a liquid vehicle containing chromic acid and phosphoric acid, drying the aluminum coating, curing the aluminum coating, burnishing the aluminum coating by glass bead blasting the aluminum particles into a coherent body of substantially uniform thickness between about 0.2 mil and 2 mils in electrically conductive contact with the steel surface of the blade and providing a cover of ceramic by forming a porous skeletal ceramic on the aluminum coating, impregnating the porous ceramic with a solution of chromium compound capable of being converted to an oxide on being heated, drying and curing the resulting impregnated ceramic, and repeating the impregnation and curing steps to harden and densify the ceramic.
Claim 2
Independent Claim
150 words
The method of making a steel gas turbine engine compressor blade having a duplex coating qualifying the blade for use in corrosive environments which comprises the steps of coating the blade with a slurry consisting essentially of aluminum particles in a liquid vehicle containing chromic acid and phosphoric acid, drying the aluminum coating, curing the aluminum coating, burnishing the aluminum coating by glass bead blasting the aluminum particles into a coherent body of substantially uniform thickness between about 0.2 mil and 2 mils in electrically conductive contact with the steel surface of the blade and providing a cover of ceramic by forming a porous skeletal ceramic on the aluminum coating, impregnating the porous ceramic with a solution of chromium compound capable of being converted to an oxide on being heated, drying and curing the resulting impregnated ceramic, and repeating the impregnation and curing steps to harden and densify the ceramic.
Claim 3
Dependent Claim
40 words
The method of claim 1 in which each ceramic curing step is carried out by heating the impregnated porous ceramic to a temperature between 500° F. and 600° F. until conversion of the chromium compound to oxide is substantially complete.
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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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |