Patent US4371312A successfully refreshed from Google Patents.
US4371312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bucket for an adjustable turbine inlet guide baffle system
Assignee: Daimler Benz AG
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Filing: 1981-03-30
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Granted: 1983-02-01
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Expires: 2001-03-30
Abstract
Abstract A bucket for an adjustable turbine guide baffle system for gas turbines is formed of an alloy material comprised of a dispersion-strengthened Fe-Cr-Al alloy containing 64.5-75.5% by weight of Fe, 15-25% by weight of Cr, 3-8% by weight of Al, 0.1-1% by weight of Ti, 0-3% by weight of Co, 0.1% by weight of Y or Ce, and 0.1-1.5% by weight of yttrium oxide or aluminum oxide. The bucket has a shank which is under friction stress in the guide baffle system and which is coated with a layer of slip-providing material that contains 90-100% by weight of nickel oxide and 0-10% by weight of one or more oxides of chromium, aluminum, zirconium, titanium, iron, manganese, or magnesium.
Inventors
- 👤 Eggert Tank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:31
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288; F01D5/30; F01D5/3092; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
A bucket for an adjustable turbine guide baffle system for gas turbines said bucket having a shank which is coated with a layer of slip-providing material by plasma spraying particles of the slip-providing material onto said shank, said particles of slip-providing material consisting essentially of 90-100% by weight of nickel oxide and 0-10% by weight of one or more oxides of chromium, aluminum, zirconium, titanium, iron, manganese, or magnesium.
Claim 2
Dependent Claim
69 words
A bucket for an adjustable turbine guide baffle system for gas turbines said bucket having a shank which is coated with a layer of slip-providing material by plasma spraying particles of the slip-providing material onto said shank, said particles of slip-providing material consisting essentially of 90-100% by weight of nickel oxide and 0-10% by weight of one or more oxides of chromium, aluminum, zirconium, titanium, iron, manganese, or magnesium.
Claim 3
Dependent Claim
47 words
A bucket according to claim 1, characterized in that the bucket is made of an alloy composition consisting essentially of 75.5% by weight of Fe, 19% by weight of Cr, 4.5% by weight of Al, 0.5% by weight of Ti, and 0.5% by weight of yttrium oxide.
Claim 4
Dependent Claim
43 words
A bucket according to claim 1 or 2, characterized in that the shank of the bucket is plasma spray coated with a layer of a slip-providing material consisting essentially of 90-95% by weight of nickel oxide and 5-10% by weight of magnesium oxide.
Claim 5
Dependent Claim
23 words
A bucket according to claim 1 or 2, characterized in that the thickness of the layer of the slip-providing material is 0.1-0.5 mm.
Claim 6
Dependent Claim
44 words
A bucket according to claim 1, characterized in that the layer of slip-providing material is porous and is best-sintered by 5-24 hours of annealing at 950° C. to 1250° C. to provide a hardness on the order of about 5000N/mm 2 at room temperature.
Claim 7
Dependent Claim
88 words
A process for producing an antifriction layer on a shank portion of a bucket for use in an adjustable turbine guide baffle system, which comprises coating the shank portion of the bucket with a layer of antifriction material consisting essentially of 90-100% by weight of nickel oxide and 0-10% by weight of one or more oxides of chromium, aluminum, zirconium, titanium, iron, manganese or magnesium by plasma spraying particles of said antifriction material on said shank portion and, thereafter, post-sintering the antifriction material coated on said shaft portion.
Claim 8
Dependent Claim
88 words
A process for producing an antifriction layer on a shank portion of a bucket for use in an adjustable turbine guide baffle system, which comprises coating the shank portion of the bucket with a layer of antifriction material consisting essentially of 90-100% by weight of nickel oxide and 0-10% by weight of one or more oxides of chromium, aluminum, zirconium, titanium, iron, manganese or magnesium by plasma spraying particles of said antifriction material on said shank portion and, thereafter, post-sintering the antifriction material coated on said shaft portion.
Claim 9
Dependent Claim
26 words
The process according to claim 6, characterized in that the antifriction material after being coated on the bucket is post-sintered for 5-24 hours at 950°-1250° C.
Claim 10
Dependent Claim
35 words
The process according to claim 6, characterized in that the antifriction layer is coated by plasma spraying particles of nickel oxide or a mixture of particles of nickel oxide and particles of the other oxide.
Claim 11
Dependent Claim
31 words
The process according to claim 8, characterized in that the particles of the oxides are sintered and comminuted to a particle size of from 20-200 μm prior to being plasma sprayed.
Claim 12
Dependent Claim
66 words
A bucket according to claim 1, characterized in that the bucket is formed of an alloy material comprised of a dispertion-strengthened Fe-Cr-Al alloy containing 64.5-75.5% by weight of Fe, 15-25% by weight of Cr, 3-8% by weight of Al, 0.1-1% by weight of Ti, 0-3% by weight of Co, 0.1% by weight of Y or Ce, and 0.1-1.5% by weight of yttrium oxide or aluminum oxide.
Claim 13
Dependent Claim
16 words
The process according to claim 6, wherein said bucket is formed of a dispersion-strengthened Fe-Cr-Al alloy.
Claim 14
Dependent Claim
34 words
The process according to claim 6, further characterized in that prior to plasma spraying of said particles of the antifriction material, the shank portion is sprayed with a thin layer of adhesion-promoting nickel-aluminide material.
Claim 15
Dependent Claim
25 words
The process according to claim 12, characterized in that the nickel-aluminide material contains about 95% by weight of nickel and 5% by weight of aluminum.
References Cited (Backward Citations)
US3486833A
Cited
US4003939A
Cited
US3801353A
Cited
DE2816520A1
Cited
US4173685A
Cited
US4275090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |