Sliding member and piston ring
AssigneeRiken
InventorsKazuya Kameda, Yuuichi Ishida, Hiroshi Maruyama, Takuma Sekiya
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Abstract
A sliding member having a hard carbon coating that has a thickness of 3 μm or more and demonstrates high peeling resistance and high wear resistance is provided. A sliding member 100 according to the present disclosure includes a base member 10 and a hard carbon coating 12 that is formed on the base member 10 and has the hydrogen content of 3 atomic % or less and a thickness of 3 μm or more. When HM represents a Martens hardness of the hard carbon coating 12 and HIT represents an indentation hardness, the ratio HM/HIT is 0.40 or more.
Claims9
A sliding member including a base member and a hard carbon coating that is formed on the base member and has a hydrogen content of 3 atomic % or less and a thickness of 3 μm or more;
- wherein, where HM represents a Martens hardness of the hard carbon coating and HIT represents an indentation hardness of the hard carbon coating, the ratio HM/HIT is 0.40 or more, the HIT is 15 GPa or more, and the HM is 6 GPa or more,
- wherein the HM and the HIT are measured according to nano-indentation hardness testing methods specified in International Standard IS014577-1:2015, and
- wherein the hard carbon coating is formed by an ion plating process with a bias voltage of −50 V or more to 0 V or less and an arc discharge current of 50 A or more to 200 A or less, and the process is intermittently paused to suppress a temperature rise of the base member.
Dependencies are inferred from the claim text.