Patent US4289447A successfully refreshed from Google Patents.
US4289447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-ceramic turbine shroud and method of making the same
Assignee: General Electric Co
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Filing: 1979-10-12
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Granted: 1981-09-15
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Expires: 1999-10-12
Abstract
Abstract A turbine shroud includes a ceramic sealing layer secured to a metal substrate. In one form, the metal substrate includes a plurality of pegs extending therefrom. Intermediate bonding layers are disposed on the peg-metal substrate structure. A ceramic sealing layer of zirconium oxide with about 20 weight percentage magnesium oxide is disposed, e.g., plasma sprayed, on the intermediate bonding layers. The ceramic sealing layer includes an ordered pattern of very fine cracks therein which reduce the thermal stress in the ceramic sealing layer. A method of constructing a turbine shroud structure is also disclosed.
Inventors
- 👤 Albert P. Sterman
- 👤 Charles H. Gay, Jr.
- 👤 Frederick W. Tegarden
- 👤 Dean T. Lenahan
- 👤 Martin C. Hemsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:12
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; F01D11/125; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12375; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
69 words
A turbine shroud structure of the type having a metal substrate and a ceramic sealing layer secured thereto, wherein the improvement comprises: mechanical matrix bonding means disposed between said metal substrate and said ceramic sealing layer and bonding said ceramic sealing layer to said metal substrate with said ceramic sealing layer including an ordered pattern of very fine cracks which reduce the thermal stress in said ceramic sealing layer.
Claim 2
Dependent Claim
69 words
A turbine shroud structure of the type having a metal substrate and a ceramic sealing layer secured thereto, wherein the improvement comprises: mechanical matrix bonding means disposed between said metal substrate and said ceramic sealing layer and bonding said ceramic sealing layer to said metal substrate with said ceramic sealing layer including an ordered pattern of very fine cracks which reduce the thermal stress in said ceramic sealing layer.
Claim 3
Dependent Claim
29 words
A turbine shroud structure in accordance with claim 1 in which said ceramic sealing layer comprises a ceramic selected from the group consisting of zirconium oxide and zirconium phosphate.
Claim 4
Dependent Claim
25 words
A turbine shroud structure in accordance with claim 2 including at least one intermediate layer disposed between said metal substrate and said ceramic sealing layer.
Claim 5
Dependent Claim
26 words
A turbine shroud structure in accordance with claim 3 in which said mechanical matrix bonding means comprises a plurality of pegs extending from said metal substrate.
Claim 6
Dependent Claim
22 words
A turbine shroud structure in accordance with claim 4 in which said pegs extend at least partially through said ceramic sealing layer.
Claim 7
Dependent Claim
19 words
A turbine shroud structure in accordance with claim 3 in which said mechanical matrix bonding means comprises wire mesh.
Claim 8
Dependent Claim
26 words
A turbine shroud structure in accordance with claim 6 in which said mechanical matrix bonding means comprises a plurality of pegs cooperating with said wire mesh.
Claim 9
Dependent Claim
25 words
A turbine shroud structure in accordance with claim 3 in which said ceramic sealing layer has a thickness of between about 0.035 to 0.040 inches.
Claim 10
Dependent Claim
27 words
A turbine shroud structure in accordance with claim 8 in which said ceramic sealing layer comprises zirconium oxide with about 6 to 25 weight percentage magnesium oxide.
Claim 11
Dependent Claim
27 words
A turbine shroud structure in accordance with claim 8 in which said ceramic sealing layer comprises zirconium oxide with about 6 to 25 weight percentage yttrium oxide.
Claim 12
Dependent Claim
18 words
A turbine shroud structure in accordance with claim 8 in which said ceramic sealing layer comprises zirconium phosphate.
Claim 13
Independent Claim
72 words
A method of constructing a turbine shroud structure, comprising the steps of: (a) providing a metal substrate; (b) providing said metal substrate with mechanical matrix bonding means having a predetermined spatial configuration, and then (c) applying a ceramic sealing layer to said mechanical matrix bonding means and causing said ceramic sealing layer to develop an ordered pattern of very fine cracks therein which reduce the thermal stress in said ceramic sealing layer.
Claim 14
Independent Claim
72 words
A method of constructing a turbine shroud structure, comprising the steps of: (a) providing a metal substrate; (b) providing said metal substrate with mechanical matrix bonding means having a predetermined spatial configuration, and then (c) applying a ceramic sealing layer to said mechanical matrix bonding means and causing said ceramic sealing layer to develop an ordered pattern of very fine cracks therein which reduce the thermal stress in said ceramic sealing layer.
Claim 15
Dependent Claim
27 words
A method in accordance with claim 12 in which said ceramic sealing layer comprises a ceramic selected from the group consisting of zirconium oxide and zirconium phosphate.
Claim 16
Dependent Claim
26 words
A method in accordance with claim 13 in which said ceramic sealing layer comprises zirconium oxide modified with about 6 to 25 weight percentage magnesium oxide.
References Cited (Backward Citations)
US3126149A
Cited
US3053694A
Cited
US3339933A
Cited
US3519282A
Cited
US3843278A
Cited
US3975165A
Cited
US4087199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |