US3887201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubbing seal material for ceramic heat exchanger
Assignee: Ford Motor Co
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Filing: 1973-11-19
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Granted: 1975-06-03
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Expires: 1993-11-19
Abstract
Abstract A coating for a rubbing seal designed to seal a ceramic matrix for a rotary regenerator in a gas turbine engine, said coating comprising primarily the oxides and halides of calcium and lithium and the sulphates and nitrates of the metals whose oxides are used in the system, whereby the coating adapts the seal system for use in an exhaust gas environment of a gas turbine engine that is relatively free from the oxides of sulfur and nitrogen and the nitrates and sulphates of various other exhaust gas constituents.
Inventors
- 👤 V Durga Nageswar Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:16
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
85 words
A HIGH TEMPERATURE RUBBING SEAL FOR USE WITH A CERAMIC MATRIX OF A GAS TURBINE REGENERATOR, SAID SEAL COMPRISING A METALLIC SUBSTRATE, A SEALING SURFACE LAYER AND AT LEAST ONE INTERMEDIATE LAYER BETWEEN THE SURFACE LAYER AND THE SUBSTRATE, SAID SURFACE LAYER HAVING A SMOOTH OUTER SEALING SURFACE ADAPTED TO SLIDABLY ENGAGE THE ADJACENT SURFACE OF THE REGENERATOR MATRIX, SAID SURFACE LAYER BEING COMPRISED OF APPROXIMATELY 75 TO 85 PERCENT COPPER AND CUPROUS OXIDE, 9 PERCENT SODIUM FLUORIDE, 11 PERCENT LITHIUM FLUORIDE AND COPPER NITRATE.
Claim 2
Dependent Claim
85 words
A HIGH TEMPERATURE RUBBING SEAL FOR USE WITH A CERAMIC MATRIX OF A GAS TURBINE REGENERATOR, SAID SEAL COMPRISING A METALLIC SUBSTRATE, A SEALING SURFACE LAYER AND AT LEAST ONE INTERMEDIATE LAYER BETWEEN THE SURFACE LAYER AND THE SUBSTRATE, SAID SURFACE LAYER HAVING A SMOOTH OUTER SEALING SURFACE ADAPTED TO SLIDABLY ENGAGE THE ADJACENT SURFACE OF THE REGENERATOR MATRIX, SAID SURFACE LAYER BEING COMPRISED OF APPROXIMATELY 75 TO 85 PERCENT COPPER AND CUPROUS OXIDE, 9 PERCENT SODIUM FLUORIDE, 11 PERCENT LITHIUM FLUORIDE AND COPPER NITRATE.
Claim 3
Dependent Claim
85 words
A high temperature rubbing seal for use with a ceramic matrix of a gas turbine regenerator, said seal comprising a metallic substrate, a sealing surface layer and at least one intermediate layer between the surface layer and the substrate, said surface layer having a smooth outer sealing surface adapted to slidably engage the adjacent surface of the regenerator matrix, said surface layer being comprised of approximately 75 to 85 percent copper and cuprous oxide, 9 percent sodium fluoride, 11 percent lithium fluoride and copper nitrate.
Claim 4
Dependent Claim
85 words
A high temperature rubbing seal for use with a ceramic matrix of a gas turbine regenerator, said seal comprising a metallic substrate, a sealing surface layer and at least one intermediate layer between the surface layer and the substrate, said surface layer having a smooth outer sealing surface adapted to slidably engage the adjacent surface of the regenerator matrix, said surface layer being comprised of approximately 75 to 85 percent copper and cuprous oxide, 9 percent sodium fluoride, 11 percent lithium fluoride and copper nitrate.
Claim 5
Dependent Claim
86 words
A high temperature rubbing seal for use with a ceramic matrix of a gas turbine regenerator, said seal comprising a metallic substrate, a sealing surface layer and at least one intermediate layer between the surface layer and the metal substrate, said surface layer having a smooth outer sealing surface adapted to slidably engage the adjacent surface of the regenerator matrix, said surface layer being comprised of approximately 75 to 85 percent copper and cuprous oxide, 9 percent sodium fluoride, 11 percent lithium fluoride and copper sulphate.
Claim 6
Dependent Claim
86 words
A high temperature rubbing seal for use with a ceramic matrix of a gas turbine regenerator, said seal comprising a metallic substrate, a sealing surface layer and at least one intermediate layer between the surface layer and the metal substrate, said surface layer having a smooth outer sealing surface adapted to slidably engage the adjacent surface of the regenerator matrix, said surface layer being comprised of approximately 75 to 85 percent copper and cuprous oxide, 9 percent sodium fluoride, 11 percent lithium fluoride and copper sulphate.
Claim 7
Dependent Claim
92 words
A high temperature rubbing seal for use with a ceramic matrix of a gas turbine regenerator, said seal comprising a metallic substrate, a sealing surface layer and at least one intermediate layer between the surface layer and the metal substrate, said surface layer having a smooth outer sealing surface adapted to slidably engage the adjacent surface of the regenerator matrix, said surface layer being comprised of approximately 75 to 85 percent copper and cuprous oxide, 9 percent sodium fluoride, 11 percent lighium fluoride and a mixture of copper nitrate and copper sulphate.
Claim 8
Dependent Claim
92 words
A high temperature rubbing seal for use with a ceramic matrix of a gas turbine regenerator, said seal comprising a metallic substrate, a sealing surface layer and at least one intermediate layer between the surface layer and the metal substrate, said surface layer having a smooth outer sealing surface adapted to slidably engage the adjacent surface of the regenerator matrix, said surface layer being comprised of approximately 75 to 85 percent copper and cuprous oxide, 9 percent sodium fluoride, 11 percent lighium fluoride and a mixture of copper nitrate and copper sulphate.
Claim 9
Dependent Claim
98 words
A gas turbine regenerator seal for use with a rotary ceramic regenerator in a gas turbine engine, said seal comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a rotary ceramic regenerator, at least one intermediate layer between the surface layer and the metal substrate and said surface layer comprising approximately 64 parts of nickel oxide, 16 parts calcium fluoride, 9 parts of sodium fluoride and 11 parts lithium fluoride, together with a measured amount of copper nitrate to inhibit oxidation of the Nickel oxide.
Claim 10
Dependent Claim
98 words
A gas turbine regenerator seal for use with a rotary ceramic regenerator in a gas turbine engine, said seal comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a rotary ceramic regenerator, at least one intermediate layer between the surface layer and the metal substrate and said surface layer comprising approximately 64 parts of nickel oxide, 16 parts calcium fluoride, 9 parts of sodium fluoride and 11 parts lithium fluoride, together with a measured amount of copper nitrate to inhibit oxidation of the Nickel oxide.
Claim 11
Dependent Claim
98 words
A gas turbine regenerator seal for use with a rotary ceramic regenerator in a gas turbine engine, said seal comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a rotary ceramic regenerator, at least one intermediate layer between the surface layer and the metal substrate and said surface layer comprising approximately: 64 parts of nickel oxide, 16 parts calcium fluoride, 9 parts of sodium fluoride and 11 parts lithium fluoride, together with a measured amount of copper sulphate to inhibit oxidation of the nickel oxide.
Claim 12
Dependent Claim
98 words
A gas turbine regenerator seal for use with a rotary ceramic regenerator in a gas turbine engine, said seal comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a rotary ceramic regenerator, at least one intermediate layer between the surface layer and the metal substrate and said surface layer comprising approximately: 64 parts of nickel oxide, 16 parts calcium fluoride, 9 parts of sodium fluoride and 11 parts lithium fluoride, together with a measured amount of copper sulphate to inhibit oxidation of the nickel oxide.
Claim 13
Dependent Claim
93 words
A gas turbine regenerator seal for use with a rotary ceramic regenerator in a gas turbine engine, said seal comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a rotary ceramic regenerator, at least one intermediate layer between the surface layer and the metal substrate and said surface layer comprising approximately: 64 parts of nickel oxide, 16 parts calcium fluoride, 9 parts of sodium fluoride and 11 parts lithium fluoride, together with a mixture of copper nitrate and copper sulphate.
Claim 14
Dependent Claim
93 words
A gas turbine regenerator seal for use with a rotary ceramic regenerator in a gas turbine engine, said seal comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a rotary ceramic regenerator, at least one intermediate layer between the surface layer and the metal substrate and said surface layer comprising approximately: 64 parts of nickel oxide, 16 parts calcium fluoride, 9 parts of sodium fluoride and 11 parts lithium fluoride, together with a mixture of copper nitrate and copper sulphate.
Claim 15
Dependent Claim
91 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 48 parts of zinc oxide, 35 parts of calcium fluoride, 17 parts of stannous oxide, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper nitrate.
Claim 16
Dependent Claim
91 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 48 parts of zinc oxide, 35 parts of calcium fluoride, 17 parts of stannous oxide, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper nitrate.
Claim 17
Dependent Claim
91 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 48 parts of zinc oxide, 35 parts of calcium fluoride, 17 parts of stannous oxide, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper sulphate.
Claim 18
Dependent Claim
91 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 48 parts of zinc oxide, 35 parts of calcium fluoride, 17 parts of stannous oxide, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper sulphate.
Claim 19
Dependent Claim
92 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 48 parts of zinc oxide, 35 parts of calcium fluoride, 17 parts of stannous oxide, 9 parts of sodium fluoride, and 11 parts lithium fluoride, together with a mixture of copper nitrate and copper sulphate.
Claim 20
Dependent Claim
92 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 48 parts of zinc oxide, 35 parts of calcium fluoride, 17 parts of stannous oxide, 9 parts of sodium fluoride, and 11 parts lithium fluoride, together with a mixture of copper nitrate and copper sulphate.
Claim 21
Dependent Claim
86 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 65 parts of zinc oxide, 35 parts of calcium fluoride, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper nitrate.
Claim 22
Dependent Claim
86 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer, said surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer comprising approximately: 65 parts of zinc oxide, 35 parts of calcium fluoride, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper nitrate.
Claim 23
Dependent Claim
83 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer compriSing approximately: 65 parts of zinc oxide, 35 parts of calcium fluoride, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper sulphate.
Claim 24
Dependent Claim
83 words
A high temperature rubbing seal for a gas turbine regenerator comprising a metal substrate, a surface layer having a sealing surface adapted to sealingly engage in rubbing contact the adjacent surface of a ceramic regenerator core, at least one intermediate layer between the surface layer and the metal substrate, said surface layer compriSing approximately: 65 parts of zinc oxide, 35 parts of calcium fluoride, 9 parts of sodium fluoride, and 11 parts of lithium fluoride, together with a measured amount of copper sulphate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |