US3773549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic coated porous metal structure and process therefor
Assignee: Union Carbide Corp
•
Filing: 1971-11-30
•
Granted: 1973-11-20
•
Expires: 1991-11-30
Abstract
Abstract A porous metal structure, and process therefor, having a thin coating of a ceramic material deposited on its surface and on the internal walls of all accessible pores which substantially improves the oxidation resistant characteristics of the structure while effecitvely maintaining its mechanical properties.
Inventors
- 👤 R Elbert
- 👤 E Farrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:08
CPC Classifications
C; C23; C23C; C23C24/00; C23F; C23F15/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
17 words
The process as in claim 1 wherein the steps (a) through (d) are repeated at least once.
Claim 2
Dependent Claim
22 words
The process as in claim 1 wherein the steps (a) through (c) are repeated at least once before step (d) is performed.
Claim 3
Dependent Claim
20 words
The process as in claim 1 wherein in step (c) said liquid suspending vehicle is substantially removed at room temperature.
Claim 4
Dependent Claim
45 words
The process as in claim 1 wherein in step (a) said ceramic-containing material is selected from at least one of the groups consisting of oxides, carbides, borides, nitrides, and silicides of aluminum, magnesium, sodium, lithium, beryllium, cesium, titanium, zirconium, hafnium, tungsten, molybdenum, iron and cobalt.
Claim 5
Dependent Claim
39 words
The process as in claim 1 wherein in step (a) said ceramic-containing material is selected from at least one of the groups consisting of silicon dioxide, chromium oxide, titanium oxide, aluminum oxide, boron oxide, sodium oxide, and potassium nitrate.
Claim 6
Dependent Claim
50 words
The process as in claim 5 wherein in step (a) said ceramic-containing material has a softening range at a temperature between about 1600* F and about 2300* F; and wherein in step (d) said porous metal material is heated to a temperature between about 1800* F and about 2400* F.
Claim 7
Dependent Claim
25 words
The process as in claim 5 wherein in step (a) said finely ground ceramic-containing material is sized between about 0.01 micron and about 10 microns.
Claim 8
Dependent Claim
34 words
The process as in claim 5 wherein in step (a) said liquid suspending vehicle is selected from at least one of the groups consisting of alcohol, an alcohol-containing liquid, methanol, acetone, heptane, and kerosene.
Claim 9
Dependent Claim
25 words
The process as in claim 5 wherein the colloidal suspension of step (a) has a viscosity of between about 100 centipoises and about 1 centipoise.
Claim 10
Dependent Claim
37 words
The process of claim 5 wherein said coated porous metal structure is intended for abradable seal applications and wherein in step (d) said layer of ceramic coating material is between about 0.01 micron and about 10 microns.
Claim 11
Dependent Claim
34 words
The process in claim 5 wherein said coated porous metal structure is intended for bearing applications and wherein in step (d) said ceramic-containing material is between about 1 micron and about 30 microns thick.
Claim 12
Dependent Claim
55 words
A porous metal structure having a nominal pore size no greater than 100 microns and having an oxidation resistant coating of a ceramic-containing material, said coating being deposited substantially on the wall surfaces of the pores in said porous metal structure thereby providing a barrier which substantially minimizes the attack of gases on the metal.
Claim 13
Dependent Claim
27 words
The porous metal structure of claim 13 intended for abradable seal applications wherein said oxidation resistant coating is between about 0.01 micron and about 10 microns thick.
Claim 14
Dependent Claim
26 words
The porous metal structure of claim 13 iNtended for bearing application wherein said oxidation resistant coating is between about 1 micron and about 30 microns thick.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |