US3713206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of a composite refractory metallic element with porous coating
Assignee: Office National d'Études et de Recherches Aérospatiales
•
Filing: 1970-06-08
•
Granted: 1973-01-30
•
Expires: 1990-06-08
Abstract
Abstract The casing of a turboreactor is constituted of a refractory alloy based on nickel and includes an abradable porous metallic coating constituted by a nickel felt. The coating is bonded by brazing to the casing by applying the coating on the casing by a pressure ring with a larger coefficient of expansion and by effecting the brazing in a fluorinated-hydrogenated atmosphere at a temperature in the region of the fusion temperature of the solder. The assembly is then subjected to a chromization or chromaluminization treatment in a halogenated-hydrogenated atmosphere (free of fluorine) at a temperature of 800* to 1100*C.
Inventors
- 👤 P Galmiche
- 👤 J Pelissier
- 👤 R Spinat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:29
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288; B; B23; B23K; B23K35/00; B23K35/001; F01D11/00; F01D11/08; F01D11/12; F01D11/122
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
Method for the manufacture of a composite refractory metallic element comprising a compact metallic support bearing a porous metallic coating, said method, to ensure the firm bonding of said porous coating to said support, including the successive steps of interposing between said porous coating and said compact support a layer of a brazing filler metal suited to the nature of said support and coating and containing at least one metal of the group iron, cobalt and nickel, then subjecting the composite element thus constituted to an application pressure causing compression of the brazing filler metal between said coating and said support, and finally effecting the operation of brazing proper in a partially gas-tight container, by subjecting the brazing filler metal, through the porous coating, to the effect of a fluorinated atmosphere at a temperature of at least the fusion temperature of the brazing filler metal so that the latter effectively wets the contact surfaces without substantial penetration into the porous layer, said brazing operation including herein its initial phase of bringing up to temperature and final phase of cooling, being conducted in a hydrogenated atmosphere.
Claim 2
Dependent Claim
185 words
Method for the manufacture of a composite refractory metallic element comprising a compact metallic support bearing a porous metallic coating, said method, to ensure the firm bonding of said porous coating to said support, including the successive steps of interposing between said porous coating and said compact support a layer of a brazing filler metal suited to the nature of said support and coating and containing at least one metal of the group iron, cobalt and nickel, then subjecting the composite element thus constituted to an application pressure causing compression of the brazing filler metal between said coating and said support, and finally effecting the operation of brazing proper in a partially gas-tight container, by subjecting the brazing filler metal, through the porous coating, to the effect of a fluorinated atmosphere at a temperature of at least the fusion temperature of the brazing filler metal so that the latter effectively wets the contact surfaces without substantial penetration into the porous layer, said brazing operation including herein its initial phase of bringing up to temperature and final phase of cooling, being conducted in a hydrogenated atmosphere.
Claim 3
Dependent Claim
144 words
Method according to claim 1, wherein the element is subjected to a treatment of chromization or of chromaluminization utilizing a halogenated atmosphere free of fluorine said treatment being effected for from several hours to several tens of hours at a temperature of 800* to 1100* C in a container partially gas-tight to the gases used, from the beginning of the rise in temperature to the end of cooling, in an enclosure containing a hydrogenated atmosphere, by means of which there is obtained, by reason of the application of chromium or of chromium and of aluminum, an improvement of the characteristics in depth of the porous coating, of those of the zone connecting the coating and the compact support, as well as an increase in the refractory quality of the brazing filler metal layer when coating and said support have been effectively bonded by brazing.
Claim 4
Dependent Claim
31 words
Method according to claim 1, wherein during the brazing operation, the pressure of application of the porous coating against the compact suppoRt is of the order of several grams per cm2.
Claim 5
Dependent Claim
31 words
Method according to claim 2, wherein during the brazing operation, the pressure of application of the porous coating against the compact support is of the order of several grams per cm2.
Claim 6
Dependent Claim
31 words
Method according to claim 4, wherein said halogenated carrier is a member selected from the group consisting of a bromide, a chloride and a mixture of a bromide and a chloride.
Claim 7
Dependent Claim
81 words
Method according to claim 1, for the manufacture of a composite refractory metallic element of which the compact outer support has the shape of a ring, wherein the means to create the pressure for the application of the porous coating against the above said support are constituted by a clamping ring constituted of a metal or alloy having a coefficient of expansion greater than that of the outer ring, said clamping ring being arranged inside the ring constituting the porous coating.
References Cited (Backward Citations)
US2424878A
Cited
US2561565A
Cited
US2585819A
Cited
US2945295A
Cited
US3417460A
Cited
US3025596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |