Sliding member

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1998-12-22

2000-11-21

Knight, Anthony

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

277444, 277440, F16J 926

Patent

active

061491624

ABSTRACT:
A gas nitrided layer is formed over the entire surface of a piston ring. A physical vapor deposition film of CrN is formed over the gas nitrided layer at the outer circumferential surface. The physical vapor deposition film has oxygen contained in a solid solution state in a crystal structure of CrN in a content of 0.5 to 20 percent by weight, pores dispersed at a rate of 1 to 15 percent within the film and a crystal structure of CrN with a preferred orientation (200) parallel to the surface being covered. The Vicker's hardness of the film is within a range of 1000 to 1800. The physical vapor deposition film of CrN can be formed beneath a wear resistant film covering the outer circumferential surface of the piston ring. The wear resistant film is for instance, a physical vapor deposition film of chromium nitride such as CrN or Cr.sub.2 N.

REFERENCES:
patent: 5582414 (1996-12-01), Miyazaki et al.
patent: 5743536 (1998-04-01), Komuro et al.
patent: 6060182 (2000-05-01), Tanaka et al.

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