Method of treating steel surfaces to prevent wear, and coating o

Details Method of treating steel surfaces to prevent wear, and coating o Method of treating steel surfaces to prevent wear, and coating o

1982-09-30

1984-03-06

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 635, 148 315, 428627, 428631, 428621, C23C 1104, C23F 724

Patent

active

044352271

ABSTRACT:
An object of the present invention is a method for the anti-wear treatment of the surface of steel parts having a carbon content of at least 0.15% and the coating obtained thereby. The method is characterized by the fact that an addition of sulfur, by depositing of a metal sulfide for example, and a vapor-phase chromizing are carried out in sucession on the surface to be treated.
The coating obtained is characterized by the presence of a layer of chromium sulfide on the surface and by the partial recrystallization of the underlying M.sub.7 C.sub.3 chromium carbide layer.
The invention can be applied to any moving mechanical system which is subject to abrasion. The invention has importance because it increases the resistance to wear and the life of the system treated while limiting the wear of the untreated opposing part as a result of friction.

REFERENCES:
patent: 2243787 (1941-05-01), Batchellar
patent: 3769098 (1973-10-01), Kanetake
patent: 3987222 (1976-10-01), Verkhouykh

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