Piston ring
AssigneeRiken
InventorsMasayuki SATO, Yuuichi MURAYAMA, Youhei IWAMOTO
Life of this patent
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Abstract
To provide a piston ring having a hard laminate coating for excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided with a hard laminate coating as thick as 10-60 μm on its outer peripheral surface, the laminate coating being formed by alternately laminating two types or more of layers made of different compounds, each of the compound layers being made of nitride of at least one metal selected from the group consisting of Ti, Cr, Zr, V, Hf and Al.
Claims7
A piston ring having a hard coating as thick as 10-60 μm on an outer peripheral sliding surface thereof,
- said hard coating being formed by alternately laminating two types or more of layers made of different compounds;
- and
- each of said compound layers being made of a nitride of at least one metal selected from the group consisting of Ti, Cr, Zr, V, Hf and Al.
Dependencies are inferred from the claim text.