Patent ID: 11946010
Assignee: NIPPON PISTON RING CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 12:
13. A manufacturing method of a sliding member including a coating film on a sliding surface on a base material,
the coating film having, when a cross section thereof is observed by a bright-field TEM image, a total thickness within a range of 1 μm to 50 μm, in repeating units including black hard carbon layers, relatively shown in black, and white hard carbon layers, relatively shown in white, and laminated in a thickness direction, the white hard carbon layer having higher hardness than the black hard carbon layer, and
the manufacturing method comprising:
forming the black hard carbon layer at a bias voltage that causes a temperature rise; and
forming the white hard carbon layer at a bias voltage that does not cause a temperature rise.