US3659861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate coating for the rubbing seal of a gas turbine regenerator
Assignee: Ford Motor Co
•
Filing: 1970-07-06
•
Granted: 1972-05-02
•
Expires: 1990-07-06
Abstract
Abstract Particles having a core of a glazing material such as calcium fluoride surrounded by a shell of a metal that oxidizes at operating temperature are sprayed on a substrate to form a rubbing seal for a ceramic regenerator. The oxide of the metal forming these shells is non abradable to the ceramic regenerator. During engine operation the shell oxidizes and wears to expose appropriate amounts of the glazing material.
Inventors
- 👤 Vemulapalli D Rao
- 👤 Yeshwant P Telang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:50
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The wear coating of claim 1 in which the shell is nickel, copper or cobalt and the core is calcium fluoride, barium fluoride, lithium fluoride, sodium fluoride, molybdenum disulfide, or tungsten selenide.
Claim 2
Dependent Claim
96 words
In a gas turbine engine having a ceramic regenerator mounted for rotation relative to an engine housing, a sliding seal for said regenerator comprising a metal substrate having a surface layer attached to one surface for rubbing against said ceramic regenerator, said surface layer comprising a plurality of particles, each of said particles having a core consisting of a glazing material surrounded by a shell of a metal oxidizable at the operating temperature of the coating, said shells being welded to each other to form an integral structure having dispersed therein a plurality of said cores.
Claim 3
Dependent Claim
26 words
The engine of claim 3 in which the cores of the particles are calcium fluoride, barium fluoride, lithium fluoride, sodium fluoride, molybdenum disulfide or tungsten selenide.
References Cited (Backward Citations)
US3407866A
Cited
US3468699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |