Nippon Piston Ring Co., Ltd.

Shota Seki

Noriaki Chida

To provide a sliding member, such as a piston ring for an internal combustion engine, having low friction and excellent toughness. The above-described problem is solved by a sliding member () such as a piston ring coated with a Cr&#x2014;B&#x2014;Ti&#x2014;V&#x2014;(Mn, Mo)&#x2014;N-based alloy film () on a sliding surface () thereof, and configured so that the alloy film () contains one or both of Mn and Mo and has a total content of the Mn and the Mo within a range of 2 mass % or less. Preferably, a B content is within a range of 0.1 mass % to 1.5 mass %, inclusive, a V content is within a range of 0.05 mass % to 1 mass %, inclusive, and a Ti content is within a range of 0.05 mass % to 1.5 mass %, inclusive.

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Saitama, Japan

Shota Seki