Kabushiki Kaisha Riken

Yuuichi Ishida

Hiroshi Maruyama

Takuma Sekiya

Kazuya Kameda

A sliding member having a hard carbon coating that has a thickness of 3 &#x3bc;m or more and demonstrates high peeling resistance and high wear resistance is provided. A sliding memberaccording to the present disclosure includes a base memberand a hard carbon coatingthat is formed on the base memberand has the hydrogen content of 3 atomic % or less and a thickness of 3 &#x3bc;m or more. When HM represents a Martens hardness of the hard carbon coatingand HIT represents an indentation hardness, the ratio HM/HIT is 0.40 or more.

Sliding member and piston ring

Provided is a sliding member having a hard carbon coating that makes high wear resistance compatible with a low coefficient of friction and that has excellent peeling resistance. A sliding member () includes a base member () and a hard carbon coating () formed on the base member (). The indentation hardness of the hard carbon coating () decreases gradually from the base member side to the surface side. The hard carbon coating () has an indentation hardness distribution at 0&#x2264;T/Ttotal&#x2264;0.6 approximated by a first line and an indentation hardness distribution at 0.9&#x2264;T/Ttotal&#x2264;1 approximated by a second line, and the intersection between the first line and the second line (T2/Ttotal, H2) satisfies Expression (1), (H3&#x2212;H1)&#xd7;T2/Ttotal+H1&#x3c;H2&#x2264;0.9&#xd7;H1, and Expression (2), 0.6&#x2264;T2/Ttotal&#x2264;0.9.

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Tokyo, Japan

Yuuichi Ishida