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US3983270A
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Composition for boundary lubricant and method
Assignee: Boeing North American Inc
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Filing: 1973-10-26
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Granted: 1976-09-28
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Expires: 1993-10-26
Abstract
Abstract A composition for forming a boundary lubricant for metal and ceramic wear surfaces consisting of transition element complexes, including those of the higher molecular weight carboxylic acids such as the long chain fatty acids (C x H 2x +1 COOH; x = 8, 9, 10, . . . 29). The transition elements used here are metals such as Cr, Mn, Fe, Co, Ni or Al that can form coordination complexes. Exemplary metal complexes are chromium stearate and chromium behenate. An exemplary complex may be prepared by (1) reducing chromium trioxide by a reducing alcohol in a low molecular weight organic acid to produce chromium acetate; then 2 hydrating and olating the chromium acetate. A solution containing a maximum concentration of about 11 weight percent of the transition metal complex in a solvent such as trichloroethylene is applied as a thin layer onto a wear surface, then the layer is heated for 1-4 hours at a temperature at or above 70°C and, within the approximate range 70°-160°C. The transition metal complex chemically adheres to the wear surface, and is cross-linked by the heat treatment, to form an anchored, polymerized array of molecules that provides a hydrophobic, durable, boundary lubricant having a low coefficient of friction. The transition metal complex solution may be applied to non-porous wear surfaces or, alternatively, may be impregnated into chrome oxide coatings or other porous refractory coatings on wear surfaces to form a porosity-filling boundary lubricant thereon. The lubricant decreases the clearance required between porous bearing surfaces, decreases the formation of corrosion cells, and lowers the coefficient of friction. The preferred amount of fatty acid or organic polyacid that can be stably incorporated into a complex chromium soap for use as a porosity-filling lubricant, that is, the optimum fatty acid mol/chromium gm-atom ratio, is approximately 1-1.2/1.
Inventors
- 👤 James J. Licari
- 👤 Robert Willing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:47
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0662; C; C07; C07F; C07F11/00; C07F11/005; C10; C10M; C10M7/00; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/125; C10M2207/129; C10M2209/00; C10M2209/02; C10M2209/10; C10N; C10N2010/00; C10N2010/06; C10N2010/12; C10N2010/14; C10N2010/16; C10N2040/00; C10N2040/02; C10N2050/00; C10N2050/08; C10N2050/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A method of boundary lubricating a wear surface, said method comprising: forming a chlorine-free metallic coordination complex of a long chain fatty acid, wherein said fatty acid is selected from an homologous carboxylic series and wherein the metallic constituent is a transition metal capable of forming coordination complexes selected from Cr, Mn, Fe, Co, Ni, and Al, by; reducing an oxide of said transition metal to an acetate of said transition metal, hydrating said acetate of said transition metal, olating the product of said hydrating step, forming a coating of said chlorine-free metallic coordination complex on said wear surface; and heating the coated wear surface to polymerize said metallic coordination complex and to anchor said complex to said wear surface.
Claim 2
Independent Claim
120 words
A method of boundary lubricating a wear surface, said method comprising: forming a chlorine-free metallic coordination complex of a long chain fatty acid, wherein said fatty acid is selected from an homologous carboxylic series and wherein the metallic constituent is a transition metal capable of forming coordination complexes selected from Cr, Mn, Fe, Co, Ni, and Al, by; reducing an oxide of said transition metal to an acetate of said transition metal, hydrating said acetate of said transition metal, olating the product of said hydrating step, forming a coating of said chlorine-free metallic coordination complex on said wear surface; and heating the coated wear surface to polymerize said metallic coordination complex and to anchor said complex to said wear surface.
Claim 3
Dependent Claim
49 words
The method of boundary lubricating a wear surface recited in claim 1 wherein said long chain fatty acid is saturated and is selected from RCOOH, R = C X H 2X +1 , where X is greater than or equal to 8 and less than or equal to 29.
Claim 4
Independent Claim
108 words
A method of boundary lubricating a wear surface said method comprising: forming a chlorine-free metallic coordination complex of a long chain fatty acid, wherein said fatty acid is selected from an homologous carboxylic series and wherein the metallic constituent is the transition metal Cr capable of forming coordination complexes, said chlorine-free metallic coordination complex being formed by: reducing chromium trioxide to chromium acetate, hydrating said chromium acetate, and olating the product of said hydrating-step; forming a coating of said chlorine-free metallic coordination complex on said wear surface; and heating the coated wear surface to polymerize said metallic coordination complex and to anchor said complex to said wear surface.
Claim 5
Independent Claim
108 words
A method of boundary lubricating a wear surface said method comprising: forming a chlorine-free metallic coordination complex of a long chain fatty acid, wherein said fatty acid is selected from an homologous carboxylic series and wherein the metallic constituent is the transition metal Cr capable of forming coordination complexes, said chlorine-free metallic coordination complex being formed by: reducing chromium trioxide to chromium acetate, hydrating said chromium acetate, and olating the product of said hydrating-step; forming a coating of said chlorine-free metallic coordination complex on said wear surface; and heating the coated wear surface to polymerize said metallic coordination complex and to anchor said complex to said wear surface.
Claim 6
Dependent Claim
42 words
The method of boundary lubricating a wear surface recited in claim 2 wherein: said long chain fatty acid is C 17 H 35 COOH; and said heating step comprises heating said coated wear surface to approximately 70-160° C for about 1-4 hours.
Claim 7
Dependent Claim
76 words
The method of boundary lubricating a wear surface recited in claim 1 wherein: said wear surface comprises porous ceramic material; said fatty acid is C 21 H 43 COOH; said metallic constituent is Cr; said metallic coordination complex contains a ratio of moles of C 21 H 43 COOH to gram atoms of chromium that is within the approximate range (0.5-2.0)/1; and said heating step is done at a temperature of at least about 70° C.
Claim 8
Dependent Claim
18 words
The method of boundary lubricating a wear surface recited in claim 2 wherein said ratio is approximately 1/1.
Claim 9
Dependent Claim
46 words
The method of boundary lubricating a wear surface recited in claim 1 wherein said step of forming a coating comprises: dissolving said chlorine-free metallic coordination complex in a substantially water-free organic solvent; and coating said wear surface with said solvent containing said chlorine-free metallic coordination complex.
Claim 10
Dependent Claim
55 words
The method of boundary lubricating a wear surface recited in claim 7 wherein said dissolving step comprises dissolving a sufficient quantity of said metallic coordination complex in said solvent to form a solution consisting of 0.1 to 11 weight percent of said metallic coordination complex; and said solvent is selected from trichloroethylene, benzene and isopropanol.
Claim 11
Dependent Claim
161 words
In combination, a method of protecting a porous wear surface from corrosion and of boundary lubricating said wear surface, said method comprising the steps of: forming a first diethanol amide of behenic acid coating on said wear surface; removing said first coating; said boundary lubricating the wear surface by a method comprising: forming a chlorine-free metallic coordination complex of a long chain fatty acid, wherein said fatty acid is selected from an homologous carboxylic series and wherein the metallic constituent is a transition metal capable of forming coordination complexes selected from Cr, Mn, Fe, Co, Ni, and Al by: reducing an oxide of said transition metal to an acetate of said transition metal, hydrating said acetate of said transition metal, olating the product of said hydrating step; forming a coating of said chlorine-free metallic coordination complex on said wear surface; and heating the coated wear surface to polymerize said metallic coordination complex and to anchor said complex to said wear surface.
Claim 12
Dependent Claim
161 words
In combination, a method of protecting a porous wear surface from corrosion and of boundary lubricating said wear surface, said method comprising the steps of: forming a first diethanol amide of behenic acid coating on said wear surface; removing said first coating; said boundary lubricating the wear surface by a method comprising: forming a chlorine-free metallic coordination complex of a long chain fatty acid, wherein said fatty acid is selected from an homologous carboxylic series and wherein the metallic constituent is a transition metal capable of forming coordination complexes selected from Cr, Mn, Fe, Co, Ni, and Al by: reducing an oxide of said transition metal to an acetate of said transition metal, hydrating said acetate of said transition metal, olating the product of said hydrating step; forming a coating of said chlorine-free metallic coordination complex on said wear surface; and heating the coated wear surface to polymerize said metallic coordination complex and to anchor said complex to said wear surface.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |