| 摘要 |
[Problem] To provide a piston ring which, when used in a high-power engine, can retain, over a long period, the excellent effect of preventing aluminum adhesion. [Solution] The upper and/or lower surface of a piston ring is coated with a resinous coating film which contains a fibrous filler having an average fiber diameter of 50-500 nm and an aspect ratio of 30-500. The content of the fibrous filler is 0.5-10 vol.% relative to the whole resinous coating film. As the fibrous filler is used at least one filler selected from carbon fibers, silica fibers, and boron nitride fibers. |
