CPC F16J 9/26 (2013.01) [C23C 14/0605 (2013.01); C23C 14/325 (2013.01)] | 18 Claims |
1. A piston ring comprising:
a base material; and
a DLC film provided to cover at least a part of a surface of the base material,
wherein the DLC film has a hydrogen content of less than 5 atom %, an extinction coefficient of 0.1 to 0.4 as measured using light having a wavelength of 550 nm, and a nanoindentation hardness of 16 to 26 GPa.
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