Process for producing a corrosion-resistant solid lubricant coat

Details Process for producing a corrosion-resistant solid lubricant coat Process for producing a corrosion-resistant solid lubricant coat

1982-06-30

1983-11-15

Weisstuch, Aaron

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204164, 204192D, C23C 1500

Patent

active

044154194

ABSTRACT:
A corrosion-resistant surface formed of a sulfide-forming metal, in particular nickel, is first subjected to an electric plasma in an atmosphere containing hydrogen sulfide to form an adherent sulfide on said surface. The sulfided surface is then exposed to simultaneous cathodic sputtering of at least one solid lubricant which is a chalcogen compound of layer structure, in particular MoS.sub.2, and at least one hydrophobic solid polymer, in particular PTFE. The coating thus formed is a composite coating in which the particles of the chalcogen compound are coated by the polymer. When the surface of the part to be coated does not consist of a corrosion-resistant sulfide-forming metal, a layer of such a metal is first deposited by cathodic sputtering. The composite coating withstands a wet oxidizing atmosphere, contrary to a coating of MoS.sub.2 alone, and the method is applicable to any mechanical part intended to rub on other surfaces, such as a watch balance wheel staff and ball or roller bearings.

REFERENCES:
patent: 4324803 (1982-04-01), Bergmann et al.
R. I. Christy, "Sputtered MoS.sub.2 Lubricant Coating Improvements", Thin Solid Films, vol. 73, pp. 299-307 (1980).
B. C. Stupp, "Synergistic Effects of Metals Co-Sputtered with MoS.sub.2 ", Thin Solid Films, vol. 84, pp. 257-266 (1981).
Thin Solid Films, vol. 53, (1978), pp. 285-300, "Coatings for Wear & Lubrication".
Russian Eng. Journal, vol. 49 (1969), pp. 28-31 -"Performance of Solid Lubricant Coatings".
Wear, vol. 43, (1977) pp. 127-140, "Frictional Properties of Solid Lubricants Modified by Polymer Grafting".

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