Process for forming low-abrasion surface layers on metal objects
AssigneeSuzuki Motor Corporation
InventorsShigeru Ishimori, Shinjiro Otsuka
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Abstract
Fine particles of a very hard material such as silicon carbide and either a solid lubricant such as carbon fluoride or a lubricant such as a powdered organic high polymer are dispersed in a metal plating solution, and a metal object to be plated is immersed as a cathode, together with a metal rod as an anode, in the plating bath, and then a suitable current is passed through the bath to cause coprecipitation of the fine particles and lubricant in the metal deposit. The plated coating layer thus obtained is electro-polished or chemically or mechanically polished and a given thickness of the metal layer is removed to leave the fine particles as tiny protrusions from the lowered surface. In this way a low-abrasion surface is produced on the metal object.
Claims18
A method for forming a low-abrasion surface on a base member comprising the steps of electrolytically depositing a metal coating to form a permanent bond with said base member and simultaneously codepositing fine particles of a hard material as a precipitate in said metal coating, removing a predetermined surface portion of said metal coating to permit said fine particles to protrude above the surface of said metal coating, and applying lubricating oil to said surface which acts as a reservoir for said lubricating oil.
A method of forming a wear-resistant surface on a base member comprising the steps of electrolytically depositing nickel thereon to form a permanent bond therewith, and simultaneously codepositing silicon carbide of a particle size of between about 0.1.mu. to 10 , so as to provide a total thickness of the deposited material of between about 100.mu. to 500.mu., removing a portion of the nickel coating to permit said silicon carbide to protrude an amount of between about 0.1.mu. and 5.mu. and applying lubricating oil to said surface which acts as a reservoir for said lubricating oil.
Dependencies are inferred from the claim text.