Piston ring with a PVD coating

Details Piston ring with a PVD coating Piston ring with a PVD coating

2007-09-11

2007-09-11

Pickard, Alison K (Department: 3673)

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

C277S442000, C277S444000

Reexamination Certificate

active

10505042

ABSTRACT:
A piston ring for an internal combustion engine is made of steel and has an outer contact surface that is nitrated and coated to no more than 70 μm with a protective coating comprising nitrides of aluminum and/or silicium and/or zirconium in a matrix of chromium-nitride based material.

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