Surface treatment of metal rings

Details Surface treatment of metal rings Surface treatment of metal rings

C - Chemistry, Metallurgy

23

C

148/43, 277/71

C23C 8/22 (2006.01) C23C 8/32 (2006.01) F16J 9/26 (2006.01) F02B 1/04 (2006.01)

Patent

CA 1207642

ABSTRACT SURFACE TREATMENT OF METAL RINGS A metal ring of generally rectangular cross-section has its radially outer surface and its side surfaces treated by being stacked with its sides in contact with other rings in a chamber. Air is excluded from the chamber and a gaseous mixture of a carburising gas and a nitrogenous gas at a temperature of 450°C to 650°C is supplied to the chamber. The proportions (% by volume) of the gases is between 25:75 and 75:25. The mixture nitro-carburises both the radially outer surface of the stacked rings and the sides of the ring. If the rings are finish machined before treatment, they are ready for use as soon as they are removed from the chamber. The nitro-carburising treatment reduces wear on the treated surfaces. The rings are used as piston rings or sealing rings.

417723

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