Piston ring

Details Piston ring Piston ring

1991-06-14

1992-10-13

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277224, 277235A, 277DIG6, F16J 928, F16J 926

Patent

active

051544334

ABSTRACT:
A piston ring comprises a martensitic stainless steel ring having a nitrided layer formed in the surface portion thereof, and a titanium nitride film coated on the outer sliding surface of the ring by an ion-plating process. According to a first embodiment of the present invention, the titanium nitride film has a nitrogen concentration which is gradually increased toward the top surface thereof to gradually lower a toughness of the film toward the top surface and to make a surface portion of the film more brittle than the other portion of the film. On the other hand, according to a second embodiment of the present invention, the titanium nitride film has a nitrogen concentration which is gradually decreased toward the top surface and to make a surface hardness of the film HV 1800 or less.

REFERENCES:
patent: 2873154 (1959-02-01), Marker
patent: 3615099 (1971-10-01), Prasse
patent: 4407515 (1983-10-01), Naito
patent: 4570946 (1986-02-01), Tsuchiya et al.
patent: 4579355 (1986-04-01), Hooroki
Plasma Science and Technology, by Herman V-Boenig Cornell University Press (Ithica, N.Y.) 1982 pp. 260-276.

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