Patent US4214905A successfully refreshed from Google Patents.
US4214905A
Expired / Lapsed
US
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Method of making bearing material
Assignee: National Aeronautics and Space Administration
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Filing: 1977-01-31
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Granted: 1980-07-29
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Expires: 1997-01-31
Abstract
Abstract A composite material is described which will provide low friction surfaces for materials in rolling or sliding contact and is self-lubricating and oxidation resistant up to and in excess of about 930° C. The composite is comprised of a metal component which lends strength and elasticity to the structure, a fluoride salt component which provides lubrication and, lastly, a glass component which not only provides oxidation protection to the metal but may also enhance the lubrication qualities of the composite.
Inventors
- 👤 Harold E. Sliney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:04
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; C; C10; C10M; C10M103/00; C22; C22C; C22C32/00; C22C32/0089; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C33/121; F16C33/14; C10M2201/00; C10M2201/04; C10M2201/05; C10M2201/08; C10M2201/081; C10M2201/082; C10M2201/084; C10M2201/12; C10N; C10N2040/00; C10N2040/02; F16C2220/00; F16C2220/20; F16C2220/60; F16C2223/00; F16C2223/02; F16C2223/08; F16C2223/30; F16C2223/42; F16C2226/00; F16C2226/30; F16C2226/32; F16C2226/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A method for fabricating a self-lubricating, oxidation-resistant composition of matter comprising the steps of pressing metal powders into a body and sintering the same to form a porous, metal body, initially infiltrating said porous metal body with glass to partially fill the pores thereof whereby the walls of the pores are coated by wetting action of the glass, and subsequently infiltrating the resulting partially filled porous, metal body with a fluoride salt.
Claim 2
Independent Claim
72 words
A method for fabricating a self-lubricating, oxidation-resistant composition of matter comprising the steps of pressing metal powders into a body and sintering the same to form a porous, metal body, initially infiltrating said porous metal body with glass to partially fill the pores thereof whereby the walls of the pores are coated by wetting action of the glass, and subsequently infiltrating the resulting partially filled porous, metal body with a fluoride salt.
Claim 3
Dependent Claim
45 words
The method of claim 1 wherein said metal powders are pressed in hydrogen for one to one-and-a-half hours at from about 1150° C. to 1180° C. to form a porous metal body of about 65% density with pore diameters of about 25 to 35 microns.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein the porous metal body is initially infiltrated with glass in an inert atmosphere under a pressure of about 10 microns at a temperature of about 1150° C. to about 1180° C. for about one-half to one hour.
Claim 5
Dependent Claim
22 words
The method of claim 1 further comprising the step of electroplating silver, gold or alloys thereof on the infiltrated porous, sintered body.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein the porous metal body is subsequently infiltrated with a fluoride salt at a temperature between 1035° C. and 1050° C. at a pressure of about 1 micron.
Claim 7
Dependent Claim
41 words
The method of claim 5 including the step of applying a positive pressure of about 7×10 N/m 2 with an inert gas to force any residual molten fluoride salt into any remaining void space subsequent to said infiltration in a vacuum.
Claim 8
Dependent Claim
32 words
The method of claim 5 including the step of applying a thin coating of fluoride eutectic of fluoride salts to fill any microscopic pores remaining on the surface of the metal body.
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) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |