US3930071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating the rubbing surfaces of the seal of the gas turbine regenerator
Assignee: Ford Motor Co
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Filing: 1973-11-14
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Granted: 1975-12-30
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Expires: 1993-11-14
Abstract
Abstract A method for preparing and applying a thermoplastic resin base coating to the surfaces of a seal assembly for a rotary regenerator in a gas turbine engine, the coating comprising a high-temperature, thermoplastic resin filled with a lubricating material, said method including preparation of a bond coating on the surface of a seal assembly shoe portion, preparation of coating material having a percentage of graphite and a percentage of boron nitride, dissolving the coating material in a suitable solvent to form a paste which may be applied to a seal shoe portion of the seal assembly used with the ceramic rotary regenerator matrix, curing the coating material and finish grinding the seal assembly following curing whereby the seal assembly is conditioned for operation with reduced friction and improved sealing characteristics at the elevated temperatures that are characteristic of gas turbine regenerator installations.
Inventors
- 👤 V Durga Nageswar Rao
- 👤 Yeshwant P Telang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
B; B05; B05D; B05D5/00; B05D5/08; F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; B05D2350/00; B05D2350/60; B05D2350/65; B05D3/00; B05D3/02; B05D3/0209; B05D3/0254; B05D3/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A METHOD FOR FORMING A LOW FRICTION SEAL COATING ON A RUBBING SEAL SURFACE FOR A CERAMIC REGENERATOR CORE COMPRISING THE STEPS OF MIXING A POLYARYSULFONE POLYMER WITH A GRAPHITE LUBRICANT WITH A PROPORTION OF APPROXIMATELY 35% POLYMER BY WEIGHT AND 65% GRAPHITE BY WEIGHT IN A SOLVENT, PREPARING A BOND COATING ON THE SEAL SURFACE BY APPLYING A MIXTURE OF APPROXIMATELY 80% NICKEL BY WEIGHT AND 20% CHROMIUM BY WEIGHT ALLOY POWDER TO THE SURFACE OF THE SEAL, APPLYING A THIN COATING OF THE POLYMERGRAPHITE MIXTURE TO THE BOND COATING, DRYING THE SOLVENT FROM THE POLYMER-GRAPHITE COATING A AP-
Claim 2
Independent Claim
100 words
A METHOD FOR FORMING A LOW FRICTION SEAL COATING ON A RUBBING SEAL SURFACE FOR A CERAMIC REGENERATOR CORE COMPRISING THE STEPS OF MIXING A POLYARYSULFONE POLYMER WITH A GRAPHITE LUBRICANT WITH A PROPORTION OF APPROXIMATELY 35% POLYMER BY WEIGHT AND 65% GRAPHITE BY WEIGHT IN A SOLVENT, PREPARING A BOND COATING ON THE SEAL SURFACE BY APPLYING A MIXTURE OF APPROXIMATELY 80% NICKEL BY WEIGHT AND 20% CHROMIUM BY WEIGHT ALLOY POWDER TO THE SURFACE OF THE SEAL, APPLYING A THIN COATING OF THE POLYMERGRAPHITE MIXTURE TO THE BOND COATING, DRYING THE SOLVENT FROM THE POLYMER-GRAPHITE COATING A AP-
Claim 3
Independent Claim
165 words
A method for forming a low friction seal coating on a rubbing seal surface for a ceramic regenerator core comprising the steps of mixing a polyarylsulfone with a graphite-boron nitride lubricant with a proportion of approximately 40% polymer, 40% graphite by weight and 20% boron nitride by weight, preparing a bond coating on a sealed surface by applying a mixture of approximately 80% nickel by weight and 20% chromium by weight alloy powder to the surface of the seal, applying a thin coating of the polymer-graphite boron-nitride mixture to the bond coating, drying the polymer-graphite boron-nitride coating at approximately 250* to 300*F for a least 15 minutes, curing the coating at approximately 400* to 500* for approximately one-half hour to one hour and pressure laminating the coating at a temperature of approximately 500*F to 800*F for approximately one-half hour to one hour with a pressure of approximately 800 to 1,500 psi, and slowly cooling the coating and grinding the coating to a smooth surface finish.
Claim 4
Independent Claim
165 words
A method for forming a low friction seal coating on a rubbing seal surface for a ceramic regenerator core comprising the steps of mixing a polyarylsulfone with a graphite-boron nitride lubricant with a proportion of approximately 40% polymer, 40% graphite by weight and 20% boron nitride by weight, preparing a bond coating on a sealed surface by applying a mixture of approximately 80% nickel by weight and 20% chromium by weight alloy powder to the surface of the seal, applying a thin coating of the polymer-graphite boron-nitride mixture to the bond coating, drying the polymer-graphite boron-nitride coating at approximately 250* to 300*F for a least 15 minutes, curing the coating at approximately 400* to 500* for approximately one-half hour to one hour and pressure laminating the coating at a temperature of approximately 500*F to 800*F for approximately one-half hour to one hour with a pressure of approximately 800 to 1,500 psi, and slowly cooling the coating and grinding the coating to a smooth surface finish.
Claim 5
Independent Claim
115 words
A method for preparing a lubrication and sealing surface on a rotary ceramic regenerator seal, said seal having a flat seal surface made of chrome stainless steel, applying a bond coating to the seal surface, said bond coating comprising a nickel-chromium alloy powder, mixing a polyarylsulfone powder, boron nitride and graphite in the proportions by weight of approximately 40% to 20% to 40%, adding a solvent to the mixture to form a slurry, spreading the slurry into thin sheets, drying and pressure moldIng the thin sheet coating to the bond coating at an elevated temperature about 400* and below 700*, cooling the seal and the applied coating, and finish grinding the surface of the coating.
Claim 6
Independent Claim
115 words
A method for preparing a lubrication and sealing surface on a rotary ceramic regenerator seal, said seal having a flat seal surface made of chrome stainless steel, applying a bond coating to the seal surface, said bond coating comprising a nickel-chromium alloy powder, mixing a polyarylsulfone powder, boron nitride and graphite in the proportions by weight of approximately 40% to 20% to 40%, adding a solvent to the mixture to form a slurry, spreading the slurry into thin sheets, drying and pressure moldIng the thin sheet coating to the bond coating at an elevated temperature about 400* and below 700*, cooling the seal and the applied coating, and finish grinding the surface of the coating.
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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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |