Composition for boundary lubricant and method
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IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0409848
(1973-10-26)
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발명자
/ 주소 |
- Licari James J. (Whittier CA) Willing Robert (Anaheim CA)
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출원인 / 주소 |
- Rockwell International Corporation (El Segundo CA 02)
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인용정보 |
피인용 횟수 :
7 인용 특허 :
0 |
초록
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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 (CxH2x1 COOH; x =8, 9, 10, . . . 29). The transition elements used here ar
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 (CxH2x1 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.
대표청구항
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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 fo
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.
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