US4423097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abradable seal and its method of production
Assignee: Safran Aircraft Engines SAS
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Filing: 1982-06-14
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Granted: 1983-12-27
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Expires: 2002-06-14
Abstract
Abstract A seal intended to wear from abrasion for use in contact with a rotor zone of a rotating machine, of the type made up of a dispersion of hollow microspheres in a binder providing cohesion of the microspheres among themselves and their attachment to a metallic support. In order to make it possible to produce the seal by torch spraying from a powdered mixture onto the support, the hollow microspheres are made of an inorganic refractory material and the binder material is a metallic material more fusible than the material of the microspheres.
Inventors
- 👤 Claude M. Mons
- 👤 Michel J. Pernot
- 👤 Roland R. Spinat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:02
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; Y; Y10; Y10S; Y10S277/00; Y10S277/922; Y10S277/935; Y10S277/939; Y10S277/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/1266; Y10T428/25; Y10T428/252; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
103 words
A method for producing a seal consisting of a dispersion of hollow microspheres in a binder and fixed to a support, said method comprising: forming a mixture of binder material powder and hollow microspheres made of an uncoated inorganic refractory material, said binder powder being fusable at a temperature lower than the melting temperature of said microspheres; transporting said mixture to a spraying torch; and using said torch to heat and project said mixture onto said support such that said binder powder is fused and bonded to said micropsheres and said support, and such that said microspheres are not substantially deformed and fragmented.
Claim 2
Independent Claim
103 words
A method for producing a seal consisting of a dispersion of hollow microspheres in a binder and fixed to a support, said method comprising: forming a mixture of binder material powder and hollow microspheres made of an uncoated inorganic refractory material, said binder powder being fusable at a temperature lower than the melting temperature of said microspheres; transporting said mixture to a spraying torch; and using said torch to heat and project said mixture onto said support such that said binder powder is fused and bonded to said micropsheres and said support, and such that said microspheres are not substantially deformed and fragmented.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein the diameter of said hollow microspheres is between 10 and 200 microns.
Claim 4
Dependent Claim
30 words
The method according to claim 1 or claim 2, wherein the material of said hollow microspheres is at least one from a group consisting of alumina, aluminum silicate and carbon.
Claim 5
Dependent Claim
26 words
The method according to claim 1, wherein the binder material is at least one from a group consisting of an alloy of a nickel and cobalt.
Claim 6
Dependent Claim
13 words
The method according to claim 4, wherein the binder material also contains chrome.
Claim 7
Dependent Claim
16 words
The method according to claim 4 or claim 5, wherein the binder material also contains aluminum.
Claim 8
Dependent Claim
13 words
The method according to claim 6, wherein the binder material also contains yttrium.
Claim 9
Dependent Claim
12 words
The method according to claim 1, wherein the binder material is ceramic.
Claim 10
Dependent Claim
13 words
The method according to claim 8, wherein the binder material is magnesium zirconate.
Claim 11
Dependent Claim
25 words
The method according to claim 1, wherein the binder material is a metallic alloy having the same base constituents as the alloy of the support.
Claim 12
Dependent Claim
17 words
The method according to claim 1, wherein said spraying is performed by means of a plasma torch.
Claim 13
Dependent Claim
17 words
The method according to claim 1, wherein said spraying is performed by means of an oxy-acetylene gun.
Claim 14
Dependent Claim
23 words
The method according to claim 1, wherein the microspheres are present in said mixture in a proportion by volume of 50 to 90%.
References Cited (Backward Citations)
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |