PISTON RING AND ITS PRODUCTION METHOD

摘要

To provide a hard-amorphous-carbon-coated piston ring having low friction and excellent wear resistance and peeling resistance to reduce the fuel consumption of automobiles, an outer peripheral surface of a steel-made piston ring base material is provided with a primary layer constituted by a CrN/Cr laminate coating or a CrN/TiN laminate coating as thick as 10-60 μm, which is obtained by alternately laminating CrN-type chromium nitride and chromium metal or TiN-type titanium nitride, an intermediate layer of chromium metal and/or titanium metal as thick as 0.05-1.0 μm, and then a hard amorphous carbon coating as thick as 0.4-20 μm.

主权项

1. A piston ring having a hard amorphous carbon coating having a thickness of 0.4-20 μm at least on its outer peripheral sliding surface;
the base material of said piston ring being steel; a primary layer and an intermediate layer being interposed between said base material and said hard amorphous carbon coating; said primary layer comprising a CrN/Cr or CrN/TiN laminate coating as thick as 10-60 μm, which is an alternate laminate of CrN-type chromium nitride and chromium metal or TiN-type titanium nitride; and said intermediate layer comprising chromium metal and/or titanium metal as thick as 0.05-1.0μm.