Patent US4576874A successfully refreshed from Google Patents.
US4576874A
Expired / Lapsed
US
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Spalling and corrosion resistant ceramic coating for land and marine combustion turbines
Assignee: Westinghouse Electric Corp
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Filing: 1984-10-03
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Granted: 1986-03-18
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Expires: 2004-10-03
Abstract
Abstract This is an improved process for fabricating a turbine blade for use in land based or marine combustion turbines and in particular is a thin ceramic coating applied to at least the portion of the blades which is designed to operate in the 1100°-1500° F. temperature range and especially in turbines designed to be useable with contaminated fuels. The invention utilizes a 1-4 mil thick ceramic coating on at least a portion of the blade designed to operate in the 1100°-1500° F. temperature range and utilizes a process in which the blade is controlled to a temperature of at least 1200° F. during the application of the ceramic coating.
Inventors
- 👤 Charles J. Spengler
- 👤 Graham A. Whitlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:09
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/12; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288; C23C28/00; C23C28/04; C23C4/02; C23C4/04; C23C4/10; C23C4/11; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12611; Y10T428/12618; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249969; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
In the process of fabricating a turbine blade of the type for use in a land-based or marine combustion turbine and having a portion designed to operate in the 1100°-1500° F. temperature range and being designed to be usable with contaminated fuels, the improvement comprising: (a) heating said blade to a temperature of at least about 1200° F., and (b) applying a 1-4 mil thick ceramic coating to at least the portion of said blade designed to operate in the 1250°-1500° F. temperature range while controlling the blade temperature to at least 1200° F., whereby said coating resists spalling and greatly reduces corrosion of blade.
Claim 2
Dependent Claim
105 words
In the process of fabricating a turbine blade of the type for use in a land-based or marine combustion turbine and having a portion designed to operate in the 1100°-1500° F. temperature range and being designed to be usable with contaminated fuels, the improvement comprising: (a) heating said blade to a temperature of at least about 1200° F., and (b) applying a 1-4 mil thick ceramic coating to at least the portion of said blade designed to operate in the 1250°-1500° F. temperature range while controlling the blade temperature to at least 1200° F., whereby said coating resists spalling and greatly reduces corrosion of blade.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein an adhesion promoting undercoating is applied prior to said ceramic coating, said undercoating being any alumina former at temperatures greater than about 1100° F.
Claim 4
Dependent Claim
11 words
The process of claim 2, wherein said undercoating is of MCrAlY.
Claim 5
Dependent Claim
12 words
The process of claim 2, wherein said ceramic is yttria stabilized zirconia.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein said ceramic is applied by plasma spraying.
Claim 7
Dependent Claim
14 words
The process of claim 2, wherein said blade is fabricated from a nickel-based superalloy.
Claim 8
Dependent Claim
34 words
The blade of claim 1, wherein said ceramic coating is applied at between 300° F. less than the maximum airfoil temperature and the maximum airfoil temperature and is applied on essentially the entire airfoil.
Claim 9
Dependent Claim
96 words
In a turbine blade of the type for use in a land-based or marine combustion turbine and having an airfoil of which at least a portion is designed to operate in the 1100°-1500° F. temperature range and being designed to be usable with contaminated fuels, the improvement comprising: a 1-4 mil thick ceramic coating on at least the portion of said blade designed to operate in the 1100°-1500° F. temperature range, said ceramic coating having been applied in a manner such that it remains in compression up to a temperature of at least about 1200° F.
Claim 10
Dependent Claim
96 words
In a turbine blade of the type for use in a land-based or marine combustion turbine and having an airfoil of which at least a portion is designed to operate in the 1100°-1500° F. temperature range and being designed to be usable with contaminated fuels, the improvement comprising: a 1-4 mil thick ceramic coating on at least the portion of said blade designed to operate in the 1100°-1500° F. temperature range, said ceramic coating having been applied in a manner such that it remains in compression up to a temperature of at least about 1200° F.
Claim 11
Dependent Claim
31 words
The blade of claim 8, wherein said ceramic coating is applied at less than 300° F. less than the maximum airfoil operating temperature and is applied on essentially the entire airfoil.
Claim 12
Dependent Claim
17 words
The blade of claim 8, wherein an adhesion promoting undercoating is applied prior to said ceramic coating.
Claim 13
Dependent Claim
11 words
The blade of claim 10, wherein said undercoating is of MCrAlY.
Claim 14
Dependent Claim
12 words
The blade of claim 8, wherein said ceramic is yttria stabilized zirconia.
Claim 15
Dependent Claim
13 words
The blade of claim 8, wherein said ceramic is applied by plasma spraying.
Claim 16
Dependent Claim
14 words
The blade of claim 8, wherein said blade is fabricated from a nickel-based superalloy.
Claim 17
Dependent Claim
36 words
The blade of claim 1, wherein said ceramic coating is applied to only the portion of the airfoil designed to operate at less than 300° F. above the blade temperature at which the coating was applied.
References Cited (Backward Citations)
US4088479A
Cited
US4055705A
Cited
US4255495A
Cited
US4321310A
Cited
US4321311A
Cited
US4328285A
Cited
US4335190A
Cited
US4481237A
Cited
US4503130A
Cited
US4457948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |