Nitrided piston ring with outer layer on surface

Details Nitrided piston ring with outer layer on surface Nitrided piston ring with outer layer on surface

1985-02-27

1986-02-18

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 1, 277224, 277235A, F16J 900, F02F 500

Patent

active

045709467

ABSTRACT:
A piston ring provided with a nitriding layer at entire surfaces of the piston ring body to form a compound layer and a diffusion layer, so that a compound layer is formed over the diffusion layer. From an outer peripheral surface of the piston ring body, the compound layer or both compound layer and diffusion layers is removed, and the plating or spraying layer is formed on the exposed diffusion layer or the exposed surface of the piston ring body.

REFERENCES:
patent: 2905512 (1959-09-01), Anderson
patent: 4299401 (1981-11-01), McCormick
patent: 4407515 (1983-10-01), Naito
The Iron Age, "Case Hardening with Nitrides," Aug. 5, 1926, pp. 340 and 341.

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